Process for the restoration of brake pressure in a motor vehicle

Details Process for the restoration of brake pressure in a motor vehicle Process for the restoration of brake pressure in a motor vehicle

1997-01-15

1999-07-27

Graham, Matthew C.

Fluid-pressure and analogous brake systems

Speed-controlled

Pulse frequency or time period controlling pressure rebuild

303158, B60T 858

Patent

active

059278315

ABSTRACT:
A process is disclosed for restoring brake pressure in a brake of a motor vehicle having an antilock brake system which subjects the brake to a brake regulating cycle. The brake regulating cycle comprises a pressure reduction phase, wherein the brake pressure is reduced from a deregulating pressure P.sub.max to a holding pressure P.sub.min, a pressure maintenance phase, wherein the holding pressure P.sub.min is maintained in the brake, and a pressure restoration phase, wherein the brake pressure in the brake is increased. According to the invention, during the pressure restoration phase the brake pressure is increased with a steep pressure gradient PG.sub.H during a first pressure increase stage until a pressure level P.sub.K is reached. Thereafter the brake pressure is increased with a low pressure gradient PG.sub.N in a second pressure increase stage. The steep pressure gradient PG.sub.H is calculated as a function of P.sub.max and P.sub.min of the last regulating cycle, while the low pressure gradient PG.sub.N is calculated as a function of P.sub.max of the last regulating cycle. Alternatively, PG.sub.H is calculated as a function of the average value of P.sub.max and P.sub.min for several previous regulating cycles, while PG.sub.N is calculated as the average value of P.sub.max for several previous regulating cycles.

REFERENCES:
patent: 3833269 (1974-09-01), Trui et al.
patent: 4320459 (1982-03-01), Lindenman et al.
patent: 5618088 (1997-04-01), Roll et al.

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