Abstract A device for testing a brake fluid pressure circuit in an antilock control system for a motor vehicle. This device has a pressure switch provided in the line between a pump and a pressure accumulator in the brake fluid pressure circuit and a pressure switch detector adapted to give ON signals after the pressure indication of the pressure switch has risen above a predetermined point and give OFF signals after it has decreased below a predetermined point. If the signals fail to change from ON to OFF within a given time after issuing a command to release the pressure in the accumulator and if they fail to change from OFF to ON within a given time after issuing a command to pressurize the accumulator, the circuit is judged to be in an abnormal state.
A device for testing a brake fluid pressure circuit in an antilock control system for a motor vehicle, comprising a pressure switch provided in a line between a pump and a pressure accumulator in said brake fluid pressure circuit; a pressure switch detector means adapted to give ON signals after the pressure indication of said pressure switch has risen above a predetermined point and OFF signals after the pressure indication has decreased below a predetermined point; and means for judging whether or not the signals supplied from said detector means have changed from ON to OFF within a predetermined period of time after issuing a command to release the pressure in said pressure accumulator and whether or not said signals have changed from OFF to ON within a predetermined period of time after issuing a command to store pressure to said accumulator.
Claim 2
Independent Claim
142 words
A device for testing a brake fluid pressure circuit in an antilock control system for a motor vehicle, comprising a pressure switch provided in a line between a pump and a pressure accumulator in said brake fluid pressure circuit; a pressure switch detector means adapted to give ON signals after the pressure indication of said pressure switch has risen above a predetermined point and OFF signals after the pressure indication has decreased below a predetermined point; and means for judging whether or not the signals supplied from said detector means have changed from ON to OFF within a predetermined period of time after issuing a command to release the pressure in said pressure accumulator and whether or not said signals have changed from OFF to ON within a predetermined period of time after issuing a command to store pressure to said accumulator.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.