Electronic control unit for an anti-skid braking system
First Claim
Patent Images
1. An electronic control unit for an anti-skid braking system;
- said braking system including control valve means adapted to control a vehicle'"'"'s brakes and means to sense the speed of the vehicle'"'"'s road wheels, signal conditioning means to generate signals based on the speed of said vehicle'"'"'s road wheels as sensed by said sensing means, microcomputer means programmed to determine control signals for said valve means, means to deliver said conditioned signals to said microcomputer means;
drive means to deliver said control signals from said microcomputer means to said control valve means, failsafe means to disable said drive means so arranged as to normally disable said drive means to thereby normally prevent said drive means from delivering said control signals from said microcomputer means to said control valve means, means to normally deliver a disable signal from said microcomputer means to said failsafe means;
whereby during normal operaton of said unit said microcomputer'"'"'s control signals are delivered via said drive means to said control valve due to said disable signals from said microcomputer holding said failsafe means effectively disabled from preventing said drive means from so delivering said microcomputer control signals; and
said microcomputer means including means to periodical pulse said failsafe means to thereby normally prevent said microcomputer means from enabling said failsafe means to disable said drive means.
1 Assignment
0 Petitions
Accused Products
Abstract
A microcomputer based electronic control unit for an anti-skid braking system includes monitoring means for testing the correct operation of the anti-skid braking system, including the electronic control unit. The disabling means includes microcomputer resetting means which in the event of program execution falling out of synchronization resets the microcomputer. The monitoring means test whether or not the wheel speed sensors are short circuited or disconnected. The unit also includes a load dump protection function, an electromagnetic interference suppression circuit and a warning light drive which may additionally be used to output diagnostic information.
-
Citations
15 Claims
-
1. An electronic control unit for an anti-skid braking system;
- said braking system including control valve means adapted to control a vehicle'"'"'s brakes and means to sense the speed of the vehicle'"'"'s road wheels, signal conditioning means to generate signals based on the speed of said vehicle'"'"'s road wheels as sensed by said sensing means, microcomputer means programmed to determine control signals for said valve means, means to deliver said conditioned signals to said microcomputer means;
drive means to deliver said control signals from said microcomputer means to said control valve means, failsafe means to disable said drive means so arranged as to normally disable said drive means to thereby normally prevent said drive means from delivering said control signals from said microcomputer means to said control valve means, means to normally deliver a disable signal from said microcomputer means to said failsafe means;
whereby during normal operaton of said unit said microcomputer'"'"'s control signals are delivered via said drive means to said control valve due to said disable signals from said microcomputer holding said failsafe means effectively disabled from preventing said drive means from so delivering said microcomputer control signals; and
said microcomputer means including means to periodical pulse said failsafe means to thereby normally prevent said microcomputer means from enabling said failsafe means to disable said drive means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
- said braking system including control valve means adapted to control a vehicle'"'"'s brakes and means to sense the speed of the vehicle'"'"'s road wheels, signal conditioning means to generate signals based on the speed of said vehicle'"'"'s road wheels as sensed by said sensing means, microcomputer means programmed to determine control signals for said valve means, means to deliver said conditioned signals to said microcomputer means;
Specification