Method and device for controlling brake booster supplementary va

Details Method and device for controlling brake booster supplementary va Method and device for controlling brake booster supplementary va

1986-09-05

1988-04-19

Look, Edward K.

Power plants

Miscellaneous

60397, 60327, 303 12, F16D 3102

Patent

active

047381124

ABSTRACT:
In the vacuum boosting system for the brake of a vehicle wherein the boosting vacuum is supplied from the intake manifold of the engine and also, as an assistance thereto, from a vacuum pump which is to be occasionally operated when the intake vacuum of the engine is insufficient to boost the brake, the operation of the vacuum pump is controlled in two alternative modes. In the first mode, when the vehicle is running at a relatively high speed with the transmission being shifted to a relatively high speed stage, the vacuum pump is switched on when the brake boosting vacuum has dropped below a first relatively high threshold value to be operated for a first relatively short period so as to recover the vacuum. In the second mode, when the vehicle is running at a relatively low speed and/or the transmission is shifted to a relatively low speed stage, the vacuum pump is switched on when the brake boosting vacuum has dropped below a second threshold value substantially lower than the above-mentioned first threshold value to be operated for a second period which is substantially longer than the above-mentioned first period.

REFERENCES:
patent: 2705870 (1955-04-01), Holton
patent: 4024709 (1977-05-01), Erdmann
patent: 4224791 (1980-09-01), Ostwald
Elektronische Getriebesteuerung by Von Helmut Mohl and Manfred Schwab in Bosch Techn. Berichte, Apr. 1983.

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