Brake booster diagnosing apparatus capable of optimizing determination of abnormality of booster
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsHiroshi Isono, Yasuji Mizutani
Life of this patent
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Abstract
Apparatus for diagnosing a booster of a vehicle braking system including a brake pedal, a master cylinder for producing a hydraulic pressure on the basis of an output force of the booster produced by boosting of a brake pedal operating force by the booster, and a wheel brake cylinder activated by the hydraulic pressure to brake a vehicle wheel, wherein a determining device is adapted to make a provisional decision as to whether the booster is abnormal or not, on the basis of a relationship between an input quantity and an output quantity of the booster, and a optimizing device is adapted to determine the provisional decision as a final decision or rectifying the provisional decision.
Claims39
An apparatus for diagnosing a booster of a braking system for an automotive vehicle, said braking system including a brake operating member operated with a brake operating force, a master cylinder for producing a hydraulic pressure on the basis of an output force of said booster produced as a result of boosting of said brake operating force by said booster, and a wheel brake cylinder which is activated by the hydraulic pressure produced by said master cylinder, to brake a wheel of the automotive vehicle, said apparatus comprising:
- a determining device for making a provisional decision as to whether said booster is abnormal or not, on the basis of a relationship between an input quantity relating to an input of said booster and an output quantity relating to an output of said booster;
- and
- an optimizing device for determining said provisional decision as a final decision or rectifying said provisional decision.
An apparatus for diagnosing a booster of a braking system for an automotive vehicle, said braking system including a brake operating member operated with a brake operating force, a master cylinder for producing a hydraulic pressure on the basis of an output force of said booster produced as a result of boosting of said brake operating force by said booster, and a wheel brake cylinder which is activated by the hydraulic pressure produced by said master cylinder, to brake a wheel of the automotive vehicle, said apparatus comprising:
- a diagnosing device for making a decision as to whether said booster is abnormal or not;
- determining means for determining whether a period of time during which said brake operating member has been kept in an operated state is shorter than a preset time;
- and
- inhibiting means for inhibiting an operation of said diagnosing device if said determining means determines that said period of time is shorter than said preset time.
An apparatus for diagnosing a booster of a braking system for an automotive vehicle, said braking system including a brake operating member operated with a brake operating force, a master cylinder for producing a hydraulic pressure on the basis of an output force of said booster produced as a result of boosting of said brake operating force by said booster, and a wheel brake cylinder which is activated by the hydraulic pressure produced by said master cylinder, to brake a wheel of the automotive vehicle, said apparatus comprising:
- first determining means for determining whether said booster is abnormal or not, while said brake operating member is being operated from a non-operated position to an operated position;
- and
- second determining means for determining whether said booster is abnormal or not, during a time period between a point of time when an operation of said brake operating member from said non-operated position back to said non-operated position is initiated and a point of time when a next operation of said brake operating member from said non-operated position to said operated position is initiated.
Dependencies are inferred from the claim text.