US20060123925A1 - Torque sensor for vehicle steering system - Google Patents
Torque sensor for vehicle steering system Download PDFInfo
- Publication number
- US20060123925A1 US20060123925A1 US11/045,369 US4536905A US2006123925A1 US 20060123925 A1 US20060123925 A1 US 20060123925A1 US 4536905 A US4536905 A US 4536905A US 2006123925 A1 US2006123925 A1 US 2006123925A1
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- voltage
- current
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D6/00—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits
- B62D6/08—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits responsive only to driver input torque
- B62D6/10—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits responsive only to driver input torque characterised by means for sensing or determining torque
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
- G01L3/02—Rotary-transmission dynamometers
- G01L3/04—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft
- G01L3/10—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating
- G01L3/101—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating involving magnetic or electromagnetic means
- G01L3/105—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating involving magnetic or electromagnetic means involving inductive means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
- G01L3/02—Rotary-transmission dynamometers
- G01L3/04—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft
- G01L3/10—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating
- G01L3/109—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating involving measuring phase difference of two signals or pulse trains
Definitions
- the present invention relates to a torque sensor for a vehicle steering system adapted to prevent a distortion phenomenon of a torque detecting signal due to a temperature variation of a coil part of the torque sensor or the like.
- an Electronic Control Unit (ECU) of an Electrical Power Steering (EPS) system controls the steering of a vehicle by detecting steering torque according to the manipulation of a steering wheel of a driver through a torque sensor.
- ECU Electronic Control Unit
- EPS Electrical Power Steering
- an output waveform of the torque detecting coil is sampled through a sampling pulse circuit.
- the phase and amplitude of the output signal vary according to an impedance variation of the torque detecting coil.
- a phase variation occurs due to environmental effect such as a temperature variation, or the like if a precise sampling of the signal is not executed, reliability of the torque sensor deteriorates by, for example, a distortion phenomenon of the torque detecting signal.
- Embodiments of the present invention are provided to prevent a distortion phenomenon of a torque detecting signal caused by a variation of the amplitude and phase of an output signal of a coil part (temperature correcting coil and torque detecting coil) due to a temperature variation of the coil part of a torque sensor for a steering system or the like.
- a torque sensor for a vehicle steering system includes a power source for supplying power.
- An oscillator oscillates by receiving a voltage from the power source.
- An offset voltage circuit part generates an offset voltage by using the voltage applied from the power source.
- a current amplifier outputs an offset voltage and an alternating current voltage, which is in-phase with a voltage outputted from the oscillator.
- a first and second coil are in series and connected at both ends thereof to output terminals of the current amplifier and the offset voltage circuit part.
- a first and second resistance are in series and connected in parallel to the first and second coil.
- a first and second waveform selecting part receive an alternating current voltage from a contact part of the first and second coil and from a contact part of the first and second resistance and then select and output a half-period of the alternating current voltage.
- a first and second peak detector detect a peak value of each output voltage of the first and second waveform selecting part.
- a first differential amplifier executes differential amplification by receiving voltages from the first and second peak detector.
- a first voltage-current converter outputs a torque signal by converting a voltage, which is outputted from the first differential amplifier, into a current.
- the torque sensor further includes a third and fourth resistance that are in series and connected in parallel to the first and second coil.
- a third and fourth waveform selecting part receive an alternating current voltage from a contact part of the first and second coil and a contact part of the third and fourth resistance and then select and output a half-period of the alternating current voltage.
- a third and fourth peak detector detect a peak value of each output voltage of the third and fourth waveform selecting part.
- a second differential amplifier executes differential amplification by receiving voltages from the third and fourth peak detector.
- a second voltage-current converter outputs a fail-safe torque signal by converting a voltage, which is outputted from the second differential amplifier, into a current.
- FIG. 1 is a block diagram of a torque sensor for a steering system according to an embodiment of the present invention
- FIG. 2 illustrates a waveform of an output voltage of an oscillator according to an embodiment of the present invention
- FIG. 3 a illustrates a waveform of an output voltage of a current amplifier according to an embodiment of the present invention
- FIG. 3 b illustrates a waveform of an output voltage of an offset voltage circuit part according to an embodiment of the present invention
- FIG. 4 illustrates a waveform of an output voltage of a first and second coil contact part according to an embodiment of the present invention
- FIG. 5 illustrates a waveform of an output voltage from a first and second waveform selecting part and a third and fourth waveform selecting part according to an embodiment of the present invention
- FIG. 6 illustrates a waveform of an output voltage from a first and second peak detector and a third and fourth peak detector according to an embodiment of the present invention.
- an embodiment of the present invention is provided to prevent a distortion phenomenon of a torque detecting signal caused by a variation of a phase and amplitude of a signal outputted from a coil part (temperature correcting coil and torque detecting coil) due to a temperature variation of the coil part of a torque sensor for a steering system or the like. This is achieved by selecting a waveform and detecting a peak value after oscillating an oscillator via an applied voltage.
- the torque sensor includes a power source (E) for supplying power.
- An oscillator 2 oscillates by receiving a voltage from power source (E).
- An offset voltage circuit, part 6 generates an offset voltage (V offset ) by using the voltage applied from power source (E).
- a current amplifier 4 outputs an offset voltage (V offset ) and an alternating current (AC) voltage, which is in-phase with a voltage outputted from oscillator 2 .
- a first and second coil (L 1 , L 2 ) are in series and are connected at both ends thereof to output terminals of current amplifier 4 and offset voltage circuit part 6 .
- a first and second resistance (R 1 , R 2 ) are in series and are connected in parallel to first and second coil (L 1 , L 2 ).
- a first and second waveform selecting part 8 a , 8 a ′ receive an alternating current (AC) voltage from a contact part (A) of first and second coil (L 1 , L 2 ) and from a contact part (B) of first and second resistance (R 1 , R 2 ) and then select and output a half-period of the AC voltage.
- a first and second peak detector 10 a , 10 a ′ detect a peak value of each output voltage of first and second waveform selecting part 8 a , 8 a ′.
- a first differential amplifier 12 a performs differential amplification by receiving voltages outputted through first and second peak detector 10 a , 10 a ′.
- a first voltage-current converter 14 a outputs a torque signal (Ts) by converting a voltage, which is outputted from first differential amplifier 12 a , into a current.
- Ts torque signal
- the torque sensor according to the embodiment of the present invention is configured to detect a fail-safe torque.
- a third and fourth resistance (R 1 ′, R 2 ′) are in series and connected in parallel to first and second coil (L 1 , L 2 ).
- a third and fourth waveform selecting part 8 b , 8 b ′ receive an AC voltage from contact part (A) of first and second coil (L 1 , L 2 ) and a contact part (B′) of third and fourth resistance (R 1 ′, R 2 ′) and then select and output a half-period of the AC voltage.
- a third and fourth peak detector 10 b , 10 b ′ detect a peak value of each output voltage of third and fourth waveform selecting part 8 b , 8 b ′.
- a second differential amplifier 12 b executes differential amplification by receiving voltages outputted through third and fourth peak detector 10 b , 10 b ′.
- a second voltage-current converter 14 b outputs a torque signal (Ts′) by converting a voltage, which is outputted from second differential amplifier 12 b , into a current.
- the fail-safe torque is required to make a steering by using torque detecting signal (Ts′) when an abnormality of torque detecting signal (Ts) or the like occurs.
- First and second waveform selecting part 8 a , 8 a ′ and third and fourth waveform selecting part 8 b , 8 b ′ can preferably be half-wave rectifier circuits.
- Current amplifier 4 outputs a direct current (DC) voltage (V offset ) and an AC voltage (Vb), which is in-phase with an output voltage of oscillator 2 , into a temperature correcting coil (L 1 , first coil) (see FIG. 3 a ).
- a DC voltage (V offset ) is inputted into a torque detecting coil (L 2 , second coil) through offset voltage circuit part 6 generating the offset voltage (V offset ) by using the power from power source (E) (see FIG. 3 b ).
- Temperature correcting coil (L 1 , first coil) and torque detecting coil (L 2 , second coil) are connected in series between an output terminal of current amplifier 4 and an output terminal of offset voltage circuit part 6 .
- An amplitude of an AC voltage of a contact part (A) between temperature correcting coil (L 1 ) and torque detecting coil (L 2 ) varies according to the difference between inductance of temperature correcting coil (L 1 ) and inductance of torque detecting coil (L 2 ) (see FIG. 4 ).
- First and second resistance (R 1 , R 2 ) are connected in parallel to temperature correcting coil (L 1 ) and torque detecting coil (L 2 ). If the values of first and second resistance (R 1 , R 2 ) are identical to each other, only the DC voltage (V offset ) is applied into contact part (B). In case third and fourth resistance (R 3 , R 4 ) have an identical value, the voltage of contact part (B′) and the voltage of contact part (B) are identical.
- first waveform selecting part 8 a and second waveform selecting part 8 a ′ Voltages of contact parts (A, B) of first and second coil (L 1 , L 2 ) and first and second resistance (R 1 , R 2 ) are applied to first waveform selecting part 8 a and second waveform selecting part 8 a ′, respectively.
- a signal waveform (Vd) outputted through first and second waveform selecting part 8 a , 8 a ′ is shown in FIG. 5 .
- a signal outputted through first and second waveform selecting part 8 a , 8 a ′ half-wave rectifier circuits
- the output signal from first and second waveform selecting part 8 a and 8 a ′ is applied into first and second peak detecting part 10 a , 10 a ′, respectively, to detect a peak value (Vp) of the applied AC signal (Vd 1 -Vd 3 ).
- Vp peak value of the applied AC signal
- Vd 1 -Vd 3 a peak value of the applied AC signal
- a rectification conversion of an AC signal from oscillator 2 and a detection of a peak value of the rectified signal are pre-executed in the embodiment of the present invention.
- a differential amplification is produced in the voltage supplied to first differential amplifier 12 a from first and second peak detecting part 10 a , 10 a ′ and then the differential amplified signal is outputted as a torque detecting signal (Ts) through first voltage-current converter 14 a .
- the outputted torque detecting signal is inputted into an Electronic Control Unit (ECU, not shown), thus a steering force is obtained by operating a motor according to torque detecting signal (Ts).
- ECU Electronic Control Unit
- fail-safe torque detecting signal Ts′
- Ts main torque detecting signal
- a rectification conversion through waveform selecting parts of the rectifier circuit and a peak value of a signal converted into rectification are detected after oscillating oscillator 2 by using the power supplied from power source (E).
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Power Steering Mechanism (AREA)
Abstract
A torque sensor for a vehicle steering system having a power source, an oscillator and an offset voltage circuit part includes a current amplifier, first and second coils that are in series and connected at both ends thereof to output terminals of said current amplifier and said offset voltage circuit part, respectively, and first and second resistances that are in series and connected in parallel to said first and second coils. The torque sensor further includes first and second waveform selecting parts, first and second peak detectors, a first differential amplifier, and a first voltage-current converter.
Description
- The present application is based on, and claims priority from, Korean Application Serial Number 10-2004-0104194, filed on Dec. 10, 2004, the disclosure of which is hereby incorporated by reference herein in its entirety.
- The present invention relates to a torque sensor for a vehicle steering system adapted to prevent a distortion phenomenon of a torque detecting signal due to a temperature variation of a coil part of the torque sensor or the like.
- Generally, an Electronic Control Unit (ECU) of an Electrical Power Steering (EPS) system controls the steering of a vehicle by detecting steering torque according to the manipulation of a steering wheel of a driver through a torque sensor.
- In the torque sensor of the EPS system, an output waveform of the torque detecting coil is sampled through a sampling pulse circuit.
- The phase and amplitude of the output signal vary according to an impedance variation of the torque detecting coil. When a phase variation occurs due to environmental effect such as a temperature variation, or the like if a precise sampling of the signal is not executed, reliability of the torque sensor deteriorates by, for example, a distortion phenomenon of the torque detecting signal.
- Embodiments of the present invention are provided to prevent a distortion phenomenon of a torque detecting signal caused by a variation of the amplitude and phase of an output signal of a coil part (temperature correcting coil and torque detecting coil) due to a temperature variation of the coil part of a torque sensor for a steering system or the like.
- A torque sensor for a vehicle steering system includes a power source for supplying power. An oscillator oscillates by receiving a voltage from the power source. An offset voltage circuit part generates an offset voltage by using the voltage applied from the power source. A current amplifier outputs an offset voltage and an alternating current voltage, which is in-phase with a voltage outputted from the oscillator. A first and second coil are in series and connected at both ends thereof to output terminals of the current amplifier and the offset voltage circuit part. A first and second resistance are in series and connected in parallel to the first and second coil. A first and second waveform selecting part receive an alternating current voltage from a contact part of the first and second coil and from a contact part of the first and second resistance and then select and output a half-period of the alternating current voltage. A first and second peak detector detect a peak value of each output voltage of the first and second waveform selecting part. A first differential amplifier executes differential amplification by receiving voltages from the first and second peak detector. A first voltage-current converter outputs a torque signal by converting a voltage, which is outputted from the first differential amplifier, into a current.
- The torque sensor further includes a third and fourth resistance that are in series and connected in parallel to the first and second coil. A third and fourth waveform selecting part receive an alternating current voltage from a contact part of the first and second coil and a contact part of the third and fourth resistance and then select and output a half-period of the alternating current voltage. A third and fourth peak detector detect a peak value of each output voltage of the third and fourth waveform selecting part. A second differential amplifier executes differential amplification by receiving voltages from the third and fourth peak detector. A second voltage-current converter outputs a fail-safe torque signal by converting a voltage, which is outputted from the second differential amplifier, into a current.
- For a better understanding of the nature and objects of the present invention, reference should be made to the following detailed description with the accompanying drawings, in which:
-
FIG. 1 is a block diagram of a torque sensor for a steering system according to an embodiment of the present invention; -
FIG. 2 illustrates a waveform of an output voltage of an oscillator according to an embodiment of the present invention; -
FIG. 3 a illustrates a waveform of an output voltage of a current amplifier according to an embodiment of the present invention; -
FIG. 3 b illustrates a waveform of an output voltage of an offset voltage circuit part according to an embodiment of the present invention; -
FIG. 4 illustrates a waveform of an output voltage of a first and second coil contact part according to an embodiment of the present invention; -
FIG. 5 illustrates a waveform of an output voltage from a first and second waveform selecting part and a third and fourth waveform selecting part according to an embodiment of the present invention; and -
FIG. 6 illustrates a waveform of an output voltage from a first and second peak detector and a third and fourth peak detector according to an embodiment of the present invention. - Referring to
FIG. 1 , an embodiment of the present invention is provided to prevent a distortion phenomenon of a torque detecting signal caused by a variation of a phase and amplitude of a signal outputted from a coil part (temperature correcting coil and torque detecting coil) due to a temperature variation of the coil part of a torque sensor for a steering system or the like. This is achieved by selecting a waveform and detecting a peak value after oscillating an oscillator via an applied voltage. - The torque sensor according to the embodiment of the present invention includes a power source (E) for supplying power. An
oscillator 2 oscillates by receiving a voltage from power source (E). An offset voltage circuit,part 6 generates an offset voltage (Voffset) by using the voltage applied from power source (E). Acurrent amplifier 4 outputs an offset voltage (Voffset) and an alternating current (AC) voltage, which is in-phase with a voltage outputted fromoscillator 2. A first and second coil (L1, L2) are in series and are connected at both ends thereof to output terminals ofcurrent amplifier 4 and offsetvoltage circuit part 6. A first and second resistance (R1, R2) are in series and are connected in parallel to first and second coil (L1, L2). A first and secondwaveform selecting part second peak detector waveform selecting part differential amplifier 12 a performs differential amplification by receiving voltages outputted through first andsecond peak detector current converter 14 a outputs a torque signal (Ts) by converting a voltage, which is outputted from firstdifferential amplifier 12 a, into a current. - The torque sensor according to the embodiment of the present invention is configured to detect a fail-safe torque.
- A third and fourth resistance (R1′, R2′) are in series and connected in parallel to first and second coil (L1, L2). A third and fourth
waveform selecting part fourth peak detector waveform selecting part differential amplifier 12 b executes differential amplification by receiving voltages outputted through third andfourth peak detector current converter 14 b outputs a torque signal (Ts′) by converting a voltage, which is outputted from seconddifferential amplifier 12 b, into a current. The fail-safe torque is required to make a steering by using torque detecting signal (Ts′) when an abnormality of torque detecting signal (Ts) or the like occurs. - First and second
waveform selecting part waveform selecting part - The operation of the torque sensor according to the embodiment of the present invention will now be described with reference to drawings.
- As illustrated in
FIG. 1 , when the power is provided from power source (E) tooscillator 2, an oscillating voltage ofoscillator 2 is applied tocurrent amplifier 4. An output waveform (Va) ofoscillator 2 is illustrated inFIG. 2 . -
Current amplifier 4 outputs a direct current (DC) voltage (Voffset) and an AC voltage (Vb), which is in-phase with an output voltage ofoscillator 2, into a temperature correcting coil (L1, first coil) (seeFIG. 3 a). Simultaneously, a DC voltage (Voffset) is inputted into a torque detecting coil (L2, second coil) through offsetvoltage circuit part 6 generating the offset voltage (Voffset) by using the power from power source (E) (seeFIG. 3 b). - Temperature correcting coil (L1, first coil) and torque detecting coil (L2, second coil) are connected in series between an output terminal of
current amplifier 4 and an output terminal of offsetvoltage circuit part 6. An amplitude of an AC voltage of a contact part (A) between temperature correcting coil (L1) and torque detecting coil (L2) varies according to the difference between inductance of temperature correcting coil (L1) and inductance of torque detecting coil (L2) (seeFIG. 4 ). - First and second resistance (R1, R2) are connected in parallel to temperature correcting coil (L1) and torque detecting coil (L2). If the values of first and second resistance (R1, R2) are identical to each other, only the DC voltage (Voffset) is applied into contact part (B). In case third and fourth resistance (R3, R4) have an identical value, the voltage of contact part (B′) and the voltage of contact part (B) are identical.
- Voltages of contact parts (A, B) of first and second coil (L1, L2) and first and second resistance (R1, R2) are applied to first
waveform selecting part 8 a and secondwaveform selecting part 8 a′, respectively. A signal waveform (Vd) outputted through first and secondwaveform selecting part FIG. 5 . As shown inFIG. 5 , a signal outputted through first and secondwaveform selecting part - In reference to
FIG. 6 , the output signal from first and secondwaveform selecting part peak detecting part oscillator 2 and a detection of a peak value of the rectified signal are pre-executed in the embodiment of the present invention. - A differential amplification is produced in the voltage supplied to first
differential amplifier 12 a from first and secondpeak detecting part current converter 14 a. The outputted torque detecting signal is inputted into an Electronic Control Unit (ECU, not shown), thus a steering force is obtained by operating a motor according to torque detecting signal (Ts). - In the fail-safe torque detecting sensor according to the embodiment of the present invention, operations of third and fourth
waveform selecting part peak detecting part differential amplifier 12 b, and second voltage-current converter 14 b are identical to that of the main circuit of torque detecting sensor described above. Therefore, fail-safe torque detecting signal (Ts′) is employed to detect a torque in a fail-safe torque detecting sensor in case of an abnormality of main torque detecting signal (Ts) or the like. - In order to prevent a distortion phenomenon of the outputted torque detecting signal even in case a phase and amplitude vary due to a temperature variation of the coil part (temperature correcting coil and torque detecting coil) of the torque sensor or the like, a rectification conversion through waveform selecting parts of the rectifier circuit and a peak value of a signal converted into rectification are detected after oscillating
oscillator 2 by using the power supplied from power source (E). - The technical concept is not limited to the embodiment of the present invention and should be determined by a logical interpretation within the scope of claims of the present invention.
- As apparent from the foregoing, there is an advantage in the torque sensor for a vehicle steering system in that a distortion phenomenon of a torque detecting signal according to the phase variation in the coil part due to a temperature variation or the like is prevented.
Claims (4)
1. A torque sensor for a vehicle steering system, comprising:
a power source that supplies power;
an oscillator that oscillates by receiving a voltage from said power source;
an offset voltage circuit part that generates an offset voltage by using said voltage supplied from said power source;
a current amplifier that outputs an alternating current voltage which is in-phase with a voltage outputted from said oscillator;
first and second coils that are in series and connected at both ends thereof to output terminals of said current amplifier and said offset voltage circuit part, respectively;
first and second resistances that are in series and connected in parallel to said first and second coils;
first and second waveform selecting parts that receive an alternating current voltage from a contact part of said first and second resistances and from a contact part of said first and second coils, respectively, and then select and output a half-period of said alternating current voltage;
first and second peak detectors that detect a peak value of each output voltage of said first and second waveform selecting parts;
a first differential amplifier that executes differential amplification by receiving voltages outputted through said first and second peak detectors;
a first voltage-current converter that outputs a torque signal by converting a voltage, which is outputted from said first differential amplifier, into a current; and
third and fourth resistances being in series and connected in parallel to said first and second coils;
third and fourth waveform selecting parts that receive an alternating current voltage from a contact part of said third and fourth resistances and from a contact part of said first and second coils, respectively, and then select and output a half-period of said alternating current voltage;
third and fourth peak detectors that detect a peak value of each output voltage of said third and fourth waveform selecting parts;
a second differential amplifier that executes differential amplification by receiving voltages outputted through said third and fourth peak detectors; and a second voltage-current converter that outputs a fail-safe torque signal by converting a voltage, which is outputted from said second differential amplifier, into a current.
2. (canceled)
3. The torque sensor as defined in claim 1 , wherein each of said first, second, third and fourth waveform selecting parts include a half-wave rectifier circuit.
4. (canceled)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020040104194A KR100597120B1 (en) | 2004-12-10 | 2004-12-10 | A torque sensor for steering system of vehicle |
KR10-2004-0104194 | 2004-12-10 |
Publications (2)
Publication Number | Publication Date |
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US7051601B1 US7051601B1 (en) | 2006-05-30 |
US20060123925A1 true US20060123925A1 (en) | 2006-06-15 |
Family
ID=36462451
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/045,369 Expired - Fee Related US7051601B1 (en) | 2004-12-10 | 2005-01-31 | Torque sensor for vehicle steering system |
Country Status (2)
Country | Link |
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US (1) | US7051601B1 (en) |
KR (1) | KR100597120B1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130090811A1 (en) * | 2010-11-18 | 2013-04-11 | Kayaba Industry Co., Ltd. | Apparatus and method for adjusting electric power steering device |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4713590A (en) * | 1985-03-07 | 1987-12-15 | Victor Company Of Japan | Control circuit for DC brushless motor producing constant output torque |
US4805463A (en) * | 1981-04-20 | 1989-02-21 | Eaton Corporation | Torque transducer |
US5419206A (en) * | 1991-11-05 | 1995-05-30 | Japan Electronic Control Systems Co., Ltd. | Phase independent torque detection and processing circuit for sensing device |
US5708216A (en) * | 1991-07-29 | 1998-01-13 | Magnetoelastic Devices, Inc. | Circularly magnetized non-contact torque sensor and method for measuring torque using same |
US5796014A (en) * | 1996-09-03 | 1998-08-18 | Nsk Ltd. | Torque sensor |
US6456090B1 (en) * | 1999-09-27 | 2002-09-24 | Nsk Ltd. | Torque sensor |
US6807871B1 (en) * | 2003-07-16 | 2004-10-26 | Mando Corporation | Torque detector |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2652208B2 (en) * | 1988-07-29 | 1997-09-10 | 光洋精工株式会社 | Torque sensor |
JP3051903B2 (en) * | 1989-01-25 | 2000-06-12 | 光洋精工株式会社 | Torque sensor |
US5060175A (en) * | 1989-02-13 | 1991-10-22 | Hughes Aircraft Company | Measurement and control system for scanning sensors |
JP3316567B2 (en) | 1994-08-30 | 2002-08-19 | 光洋精工株式会社 | Torque detector |
-
2004
- 2004-12-10 KR KR1020040104194A patent/KR100597120B1/en not_active IP Right Cessation
-
2005
- 2005-01-31 US US11/045,369 patent/US7051601B1/en not_active Expired - Fee Related
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4805463A (en) * | 1981-04-20 | 1989-02-21 | Eaton Corporation | Torque transducer |
US4713590A (en) * | 1985-03-07 | 1987-12-15 | Victor Company Of Japan | Control circuit for DC brushless motor producing constant output torque |
US5708216A (en) * | 1991-07-29 | 1998-01-13 | Magnetoelastic Devices, Inc. | Circularly magnetized non-contact torque sensor and method for measuring torque using same |
US5419206A (en) * | 1991-11-05 | 1995-05-30 | Japan Electronic Control Systems Co., Ltd. | Phase independent torque detection and processing circuit for sensing device |
US5796014A (en) * | 1996-09-03 | 1998-08-18 | Nsk Ltd. | Torque sensor |
US6456090B1 (en) * | 1999-09-27 | 2002-09-24 | Nsk Ltd. | Torque sensor |
US6807871B1 (en) * | 2003-07-16 | 2004-10-26 | Mando Corporation | Torque detector |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130090811A1 (en) * | 2010-11-18 | 2013-04-11 | Kayaba Industry Co., Ltd. | Apparatus and method for adjusting electric power steering device |
US9573620B2 (en) * | 2010-11-18 | 2017-02-21 | Kyb Corporation | Apparatus and method for adjusting electric power steering device |
Also Published As
Publication number | Publication date |
---|---|
US7051601B1 (en) | 2006-05-30 |
KR20060065787A (en) | 2006-06-14 |
KR100597120B1 (en) | 2006-07-05 |
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