Vehicular anti-brake lock system and method of controlling braking pressure
First Claim
1. In a vehicle having an anti-brake lock system, a method of controlling braking, wherein the vehicle has means (1) for generating signals representative of the rotary behaviour of the vehicle wheels and providing wheel speed (ω
- ), wheel acceleration (+ω
) and wheel deceleration (-ω
) signals;
an evaluation stage (2) receiving the said signals and providing brake control signals;
wheel brake means (7) responsive to the wheel brake control signals to apply braking pressure to the wheel brakes, said evaluation stage controlling after a braking pressure reduction (FIG. 4;
B-C), the following first brake pressure increase pulse (Δ
p2), wherein the level of the brake pressure increase pulse is dependent on the level of a preceding brake pressure decrease (Δ
p1) said pulse being, followed by further brake pressure increase pulses of small pressure level,and comprising, the step of controlling the level of the brake pressure increase pulse (Δ
p2) additionally as a function of a quotient (Q), in which the quotient (Q), is defined bydividing a signal representative of maximum wheel acceleration (+ω
m) by the sum of signals representative of maximum wheel acceleration (+ω
m) and maximum wheel deceleration (-ω
m), ##EQU5## wherein ω
is representative of the wheel speed ω
is representative of the change of wheel speed; and
ω
m is the maximum change of wheel speed.
1 Assignment
0 Petitions
Accused Products
Abstract
A wheel anti-blocking control system (ABS), in which, subsequent to a brake pressure drop, the first brake pressure rise pulse ΔP2 is controlled, in dependence on the preceding brake pressure drop (ΔP1) and on a quotient defined by the relationship: ##EQU1## in which +ωm and -ωm are representative of maximum angular acceleration/deceleration of the respective wheel being controlled and α is a factor somewhat less than unity, and which may vary in dependence on the direction of movement of the vehicle, for example whether the vehicle is moving in a straight path or is moving along a curve. If moving along a curve, so that angular acceleration is involved, the factor α is reduced.
22 Citations
11 Claims
-
1. In a vehicle having an anti-brake lock system, a method of controlling braking, wherein the vehicle has means (1) for generating signals representative of the rotary behaviour of the vehicle wheels and providing wheel speed (ω
- ), wheel acceleration (+ω
) and wheel deceleration (-ω
) signals;an evaluation stage (2) receiving the said signals and providing brake control signals; wheel brake means (7) responsive to the wheel brake control signals to apply braking pressure to the wheel brakes, said evaluation stage controlling after a braking pressure reduction (FIG. 4;
B-C), the following first brake pressure increase pulse (Δ
p2), wherein the level of the brake pressure increase pulse is dependent on the level of a preceding brake pressure decrease (Δ
p1) said pulse being, followed by further brake pressure increase pulses of small pressure level,and comprising, the step of controlling the level of the brake pressure increase pulse (Δ
p2) additionally as a function of a quotient (Q), in which the quotient (Q), is defined bydividing a signal representative of maximum wheel acceleration (+ω
m) by the sum of signals representative of maximum wheel acceleration (+ω
m) and maximum wheel deceleration (-ω
m), ##EQU5## wherein ω
is representative of the wheel speed ω
is representative of the change of wheel speed; and
ω
m is the maximum change of wheel speed. - View Dependent Claims (2, 3, 4, 5, 6)
- ), wheel acceleration (+ω
-
7. Brake signal control system for a vehicle having an anti-brake lock system,
wherein the vehicle has means (1) for generating signals representative of the rotary behaviour of the vehicle wheels and providing corresponding signals; -
an evaluation stage (2) receiving the said signals and providing brake control signals; wheel brake means (7) responsive to the wheel brake control signals to apply braking pressure to the wheel brakes, said evaluation stage controlling, after a braking pressure reduction (FIG. 4;
B-C) the following first brake pressure increase pulse (Δ
p2), wherein the level of the brake pressure increase pulse is dependent on the level of a preceding brake pressure decrease (Δ
p1), said pulse being followed by further pulses of small pressure leveland comprising, means (23, 24, 30,
32) for controlling the level of the brake pressure increase pulse (Δ
p2) additionally as a function of a quotient (Q), in which the quotient (Q) includes factors representative of wheel deceleration (-ω
) and wheel acceleration (+ω
), as sensed by said signal generating means (1),wherein the means for controlling the level of the first brake pressure increase pulse comprises means for deriving the quotient including means for determining maximum angular wheel acceleration (+ω
m) and obtaining a representative maximum wheel acceleration signal,means for determining maximum angular wheel deceleration (-ω
m) and obtaining a representative maximum wheel deceleration signal;adder means (23) receiving said maximum wheel acceleration and deceleration signals and providing a sum, or added amount signal; and divider means (24) connected to divide the maximum wheel acceleration signal by the sum, or added amount, signal to obtain an output signal in accordance with the relationship "one";
##EQU6## - View Dependent Claims (8, 9, 10, 11)
-
Specification