Brake booster diagnosing apparatus capable of optimizing determination of abnormality of booster
First Claim
1. 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.
1 Assignment
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Accused Products
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.
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Citations
39 Claims
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1. 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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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38. 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:
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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.
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39. 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:
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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.
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Specification