Automotive brake control system with skid control unit
AssigneeUnisia Jecs Corporation
InventorsNobuyuki Ohtsu, Shigeyuki Tanikawa
Life of this patent
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Abstract
An automotive brake control system with an ABS system employing a hydraulic modulator, wheel-speed sensors, a longitudinal acceleration sensor, and a skid control unit. The skid control unit includes a lateral acceleration dependent offset-value arithmetic-calculation section which arithmetically calculates an offset value based on lateral acceleration exerted on the vehicle. Also provided is a pseudo-vehicle-speed compensation section which decreasingly compensates for a pseudo vehicle speed (an estimated vehicle speed value) by compensating for a signal value of input information data from the longitudinal acceleration sensor by the offset value based on the lateral acceleration exerted on the vehicle owing to the turn, when the vehicle is decelerating.
Claims6
An automotive brake control system, comprising:
- a hydraulic modulator capable of regulating wheel-brake cylinder pressures of each of road wheels of an automotive vehicle, independently of each other;
- wheel-speed sensors detecting wheel speeds of each of the road wheels;
- a longitudinal acceleration sensor detecting longitudinal acceleration and deceleration exerted on the vehicle;
- and
- a skid control unit configured to be electronically connected to said wheel-speed sensors and said longitudinal acceleration sensor for estimating a pseudo vehicle speed based on input information data from said wheel-speed sensors and said longitudinal acceleration sensor, and electronically configured to said hydraulic modulator for operating said hydraulic modulator in response to the pseudo vehicle speed estimated and the wheel speeds detected to prevent a wheel lock-up condition of each of the road wheels;
- said skid control unit comprising:
- (a) a wheel-speed difference arithmetic-calculation section arithmetically calculating a wheel-speed difference between left and right road wheels from among the road wheels,
- (b) a decision section discriminating a turning degree of the vehicle, on the basis of the wheel-speed difference arithmetically calculated at a beginning of braking action,
- (c) a lateral-acceleration arithmetic-calculation section arithmetically calculates lateral acceleration exerted on the vehicle on the basis of at least the wheel-speed difference,
- (d) an offset-value arithmetic-calculation section arithmetically calculating an offset value based on the lateral acceleration, and
- (e) a pseudo-vehicle-speed compensation section decreasingly compensating for the pseudo vehicle speed by compensating for a signal value of the input information data from said longitudinal acceleration sensor by the offset value based on the lateral acceleration exerted on the vehicle owing to the turn, when the vehicle is decelerating.
Dependencies are inferred from the claim text.