Title:
TORQUE SENSOR
Document Type and Number:
Japanese Patent JP3575319
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To realize a torque sensor in which the detection of a torque and the detection of the abnormality of a torque detection circuit can be performed with a simple circuit constitution.
SOLUTION: The inductance of a sensor coil 41 is used as the inductance L of an LR oscillation circuit 22. A signal having a cycle which is proportional to the inductance L is oscillated by the main oscillation circuit 22. The signal is waveform-shaped by a pulse shaping circuit 23 so as to be output to a timer input 31 in a microcomputer 30 as a torque signal. Then, the microcomputer 30 computes the cycle of the torque signal, and it computes a torque which corresponds to the cycle. In addition, the abnormality of the main ocillation circuit 22 can be detected on the basis of the cycle A of the torque signal and on the basis of the pulse width B of a monitor 1 signal. With this constitution, a circuit which applies a sine wave to a torque detection circuit and a circuit or the like which A/D-converts the torque signal is not required.
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Inventors:
Jiro Nakano
Ichiro Nagashima
Takeshi Tsukamoto
Tsuyoshi Yamakawa
Ichiro Nagashima
Takeshi Tsukamoto
Tsuyoshi Yamakawa
Application Number:
JP8955799A
Publication Date:
October 13, 2004
Filing Date:
March 30, 1999
Export Citation:
Assignee:
Toyota Koki Co., Ltd.
International Classes:
G01L25/00; G01L3/10; (IPC1-7): G01L3/10; G01L25/00
Domestic Patent References:
| JP11063911A | ||||
| JP10197367A | ||||
| JP10142082A | ||||
| JP8054300A | ||||
| JP6041889B2 | ||||
| JP5050333U |
Attorney, Agent or Firm:
Akito Tashita
Isosuke Kato
Isosuke Kato
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