Process and device for testing the function of an electronically controlling brake system
First Claim
1. Method for testing the functioning of an electronically controlled brake system in a vehicle having a central control unit, brakes at individual wheels, and brake actuation control units associated with the respective brakes of at least one wheel on each axle of the vehicle, each brake actuation control unit comprising a microcomputer, said method comprisingmeasuring an operating variable by means of each said brake actuation control unit,transmitting the measured values of the operating variables to said central control unit,forming a reference variable in said central control unit based on at least one of said operation variables measured by the brake actuation control units,comparing each operating variable with said reference variable in said central control unit, andidentifying a fault associated with the respective control unit when the respective operating variable deviates from the reference variable by more than a predetermined tolerance value.
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Accused Products
Abstract
An operating variable detected by at least two control units for actuating the brakes is distributed to a central control unit which identifies an error state in the area of the control unit in question when the operating variable in question deviates unacceptably from a reference value.
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Citations
16 Claims
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1. Method for testing the functioning of an electronically controlled brake system in a vehicle having a central control unit, brakes at individual wheels, and brake actuation control units associated with the respective brakes of at least one wheel on each axle of the vehicle, each brake actuation control unit comprising a microcomputer, said method comprising
measuring an operating variable by means of each said brake actuation control unit, transmitting the measured values of the operating variables to said central control unit, forming a reference variable in said central control unit based on at least one of said operation variables measured by the brake actuation control units, comparing each operating variable with said reference variable in said central control unit, and identifying a fault associated with the respective control unit when the respective operating variable deviates from the reference variable by more than a predetermined tolerance value.
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12. Apparatus for testing the functioning of an electronically controlled brake system in a vehicle having brakes at individual wheels, said apparatus comprising
brake actuation control units associated with the respective brakes of at least one wheel on each axle of the vehicle, each brake actuation control unit having a microcomputer, each brake actuation control unit comprising measuring means which measures an operating variable available at the respective wheel, and transmitting means which transmits the measured operating variables, a central control unit which receives the operating variables transmitted by the brake actuation control units, forms a reference variable based on at least one of said operating variables, compares said operating variables to said reference variable, and identifies a fault associated with the respective control circuit when a respective operating variable deviates from said reference variable by more than a predetermined tolerance value.
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13. Apparatus for controlling the brakes of a vehicle, said apparatus comprising
brake pedal means actuated by a driver, a central control unit for generating nominal values for control of said brakes based on the degree of actuation of said brake pedal, brake actuation control units associated with the brakes of at least one wheel on each axle of the vehicle, each brake actuation control unit having a microcomputer, each brake actuation control unit measuring the operating voltage of the brake actuation unit, sending the measured value of the operating voltage to the central control unit, and adjusting the operating variable based on the respective nominal value, said central control unit further comprising means for forming a reference value based on at least one of said operating voltage values measured by the brake activation control units, and comparing said operating voltage values to said reference value, means for identifying a fault associated with the respective control unit when said operating voltage value deviates from said reference value by more than a predetermined tolerance value, and a brake value transmitter which initiates an emergency mode of brake control when a fault is detected.
Specification