Fluid-pressure and analogous brake systems – Accumulator
Patent
1998-10-22
2000-11-14
Mar, Michael
Fluid-pressure and analogous brake systems
Accumulator
303 3, B60T 1374
Patent
active
061459399
ABSTRACT:
An improved cold temperature compensation control method for an EH braking system in which cold temperature operation is detected without requiring a temperature sensor. An electronic controller monitors the pressure developed by one or more electrically operated boost units for a characteristic pressure profile that occurs in cold temperature operation of the braking system, and adjusts the control strategy when the characteristic pressure profile is detected. The characteristic pressure profile is deemed by its frequency and amplitude parameters; specifically, a frequency above a threshold frequency, and an amplitude above a threshold amplitude. In a first mechanization, the controller responds to a detected cold temperature operation by reducing the gain of a closed-loop pressure control, while in a second mechanization, the controller responds by switching from the closed-loop pressure control to a closed-loop position control.
REFERENCES:
patent: 3253409 (1966-05-01), Kellogg et al.
patent: 5971499 (1999-10-01), Pape et al.
patent: 5971503 (1999-10-01), Joyce et al.
patent: 6012783 (2000-01-01), Schwarzer et al.
Chang Hsiao Hsiou (Eileen)
Littlejohn Deron Craig
Stacey Scott Alan
General Motors Corporation
Mar Michael
Nguyen Xuan Lan
Sigler Robert M.
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