Automotive control system employing acceleration sensor and fault detecting system therefor
First Claim
1. In an automotive control system employing a lateral acceleration sensor for monitoring lateral acceleration exerted on a vehicular body and a longitudinal acceleration sensor for monitoring longitudinal acceleration exerted on the vehicular body as control parameters, a fault detecting system for detecting failure of said lateral and longitudinal acceleration sensors, comprising:
- first means for deriving a data value, said first means comprising receiving means for receiving a lateral acceleration indicative signal output from said lateral acceleration sensor and a longitudinal acceleration indicative signal output from said longitudinal acceleration sensor and summing means for summing said lateral acceleration indicative signal and said longitudinal acceleration indicative signal; and
second means for detecting a faulty state of one of said lateral and longitudinal acceleration sensors, said second means comprising comparing means for comparing said data value with a predetermined reference value and indication means for producing a faulty indication signal in response to said comparing means.
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Accused Products
Abstract
An automotive activity control system controls vehicular driving activity, such as power distribution for delivering driving torque generated by prime mover of the vehicle to primary and secondary driving wheels, vehicular braking operation for preventing the road wheels from causing skidding during braking operation, vehicular attitude. The control system includes acceleration sensor, such as a longitudinal acceleration sensor, a lateral acceleration sensor, a vertical acceleration sensor for monitoring a vehicular driving behavior and providing control parameter for activity control. The control system detects faulty condition of the acceleration sensor for taking place fail-safe operation. Particularly, the control system detects faulty condition of the acceleration sensor to generate sensor signal representative of abnormal or impossible acceleration resulting in malfunction of activity control.
73 Citations
26 Claims
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1. In an automotive control system employing a lateral acceleration sensor for monitoring lateral acceleration exerted on a vehicular body and a longitudinal acceleration sensor for monitoring longitudinal acceleration exerted on the vehicular body as control parameters, a fault detecting system for detecting failure of said lateral and longitudinal acceleration sensors, comprising:
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first means for deriving a data value, said first means comprising receiving means for receiving a lateral acceleration indicative signal output from said lateral acceleration sensor and a longitudinal acceleration indicative signal output from said longitudinal acceleration sensor and summing means for summing said lateral acceleration indicative signal and said longitudinal acceleration indicative signal; and second means for detecting a faulty state of one of said lateral and longitudinal acceleration sensors, said second means comprising comparing means for comparing said data value with a predetermined reference value and indication means for producing a faulty indication signal in response to said comparing means. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An automotive activity control system for controlling vehicular driving behaviour affected by accelerations exerted on the vehicular body, comprising:
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a first acceleration sensor for monitoring a first acceleration exerted on the vehicular body in a first direction to produce a first acceleration indicative signal; a second acceleration sensor for monitoring a second acceleration exerted on the vehicular body in a second direction which is different from said first direction to produce a second acceleration indicative signal; a vehicular driving condition sensor for monitoring a vehicular driving condition for producing a control parameter indicative signal which represents vehicular driving parameters affecting vehicular driving behaviour; first means provided for controlling operation of a vehicular component for controlling vehicular driving behaviour according to said first acceleration indicative signal, said second acceleration indicative signal and said control parameter indicative signal, said first means being operable in a first normal control mode and a second fail-safe mode; second means receiving said first acceleration indicative signal output from said first acceleration sensor and said second acceleration indicative signal output from said second acceleration sensor for deriving a data value based on the sum of both of said first acceleration indicative signal and said second acceleration indicative signal; third means comprising comparing means for comparing said data value with a predetermined reference value for detecting a faulty state of one of said first and second acceleration sensors and command means for commanding said fail-safe mode operation of said first means. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A power train control system for adjusting transmitting output torque of a prime mover of a vehicle distributed to front and rear wheels, comprising:
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a first acceleration sensor for monitoring a first acceleration exerted on the vehicular body in a first direction to produce a first acceleration indicative signal; a second acceleration sensor for monitoring a second acceleration exerted on the vehicular body in a second direction which is different from said first direction to produce a second acceleration indicative signal; a third sensor for monitoring a preselected vehicle driving parameter representative of a vehicular driving condition as a power train control parameter and for producing a parameter indicative signal; first means provided for adjusting distribution rate of said output torque on the basis of at least a selected one of said first and second acceleration indicative signals and said parameter indicative signal, said first means being operable in a first normal control mode and a second fail-safe mode; second means receiving said first acceleration indicative signal output from said first acceleration sensor and said second acceleration indicative signal output from said second acceleration sensor for deriving a data value based on the sum of both of said first acceleration indicative signal and said second acceleration indicative signal; third means for comparing said data value with a predetermined reference value for detecting faulty state of one of said first and second acceleration sensors for commanding said fail-safe mode operation of said first means. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A power train control system for adjusting transmitting output torque of a prime over of a vehicle distributed to front and rear wheels in cooperation with an anti-skid brake control system, said brake control system adjusting braking pressure in wheel cylinders for controlling wheel slippage during braking operation at a predetermined optimum level, comprising:
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a sensor for monitoring a preselected vehicle driving parameter representative of a vehicular driving condition as a power train control parameter and for producing parameter indicative signals; first means provided for adjusting distribution rate of said output torque on the basis of said parameter indicative signals, said first means being operable in a first mode for deriving distribution of said output torque wherein said parameter indicative signals indicate a wheel speed difference between a primary and secondary driving wheels, and a second mode for deriving said distribution ratio of said output torque wherein said parameter indicative signals indicate an engine revolution speed; second means for commanding said first mode operation of said first means while the anti-skid brake control is held in inactive state and commanding said second mode operation while said anti-skid brake control system is active; and a fault detecting system including; summing means for summing (i) a first acceleration indicative signal output from said first acceleration sensor and (ii) a second acceleration indicative signal output from said longitudinal acceleration sensor for deriving a data value based on a sum of said first acceleration indicative signal and said second acceleration indicative signal, and comparing means for comparing said data value with a predetermined reference value for detecting faulty state of one of said first and second acceleration sensors for producing a faulty state indicative signal. - View Dependent Claims (24, 25)
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26. A power train control system for adjusting transmitting output torque of a prime mover of a vehicle distributed to front and rear wheels in cooperation with an anti-skid brake control system, said brake control system adjusting braking pressure in wheel cylinders for controlling wheel slippage during braking operation at a predetermined optimum level, comprising:
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a sensor for monitoring a preselected vehicle driving parameter representative of a vehicular driving condition as a power train control parameter and for producing parameter indicative signals; first means provided for adjusting distribution rate of said output torque on the basis of said parameter indicative signals, said first means being operable in a first mode for deriving distribution of said output torque wherein said parameter indicative signals indicate a wheel speed difference between a primary and secondary driving wheels, and a second mode for deriving said distribution ratio of said output torque wherein said parameter indicative signals indicate an engine revolution speed; second means for commanding said first mode operation of said first means while the anti-skid brake control is held in inactive state and commanding said second mode operation while said anti-skid brake control system is active; and a fault detecting system including; third means for receiving (i) a first acceleration indicative signal output from said first acceleration sensor and (ii) a second acceleration indicative signal output from said longitudinal acceleration sensor for deriving a data value by deriving the sum of the squares of the respective first and second acceleration indicative signal values and deriving the square root of said sum, and fourth means for comparing said data value with a predetermined reference value for detecting faulty state of one of said first and second acceleration sensors for producing a faulty state indicative signal.
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Specification