Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1994-03-11
1995-07-18
Graham, Matthew C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
3031152, B60T 800, B60T 1100
Patent
active
054335140
ABSTRACT:
A pressure control actuator suitable for an automotive brake control system comprises a pressure-regulation cylinder slidably enclosing a piston and cooperative with the piston for defining therein a variable-volume pressure chamber which is fluidly connected to a wheel cylinder, a shut-off valve through which the variable-volume chamber is connected to a master cylinder, a motor-driven thrust generator drivingly connected to the piston for producing a thrust, and a heavily pre-loaded return spring for biasing the piston in a first direction opposite to a second direction in which the piston is pushed by the master-cylinder pressure shut-up in the chamber, when the piston is displaced apart from its neutral position in the second direction so that the volume of the chamber is enlarged. A pre-load of the spring is set to balance with a force acting on the piston by a maximum master-cylinder pressure introduced into the chamber. In the absence of thrust acting on the piston after termination of the ABS pressure-reduction control, the piston quickly and precisely returns to the neutral position. Zero-thrust ensures a quick recovery of the piston to the neutral position at the aid of light braking action after termination of the TCS pressure-intensifying control.
REFERENCES:
patent: 4691813 (1987-09-01), Dittner et al.
patent: 4717211 (1988-01-01), Dittner
patent: 4950028 (1990-08-01), Harrison
patent: 5143429 (1992-09-01), Higashimata et al.
patent: 5188436 (1993-02-01), Devall
Tsukamoto Masahiro
Watanabe Takayuki
Graham Matthew C.
Nissan Motor Co,. Ltd.
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