The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 18, 1995
Filed:
Mar. 11, 1994
Masahiro Tsukamoto, Yokosuka, JP;
Takayuki Watanabe, Yokosuka, JP;
Nissan Motor Co., Ltd., Yokohama, JP;
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.