Vehicle speed detecting sensor for anti-lock brake control system
AssigneeIsuzu Motors Limited
InventorKiichi Tsuchiya
Life of this patent
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Abstract
The sensor comprises an operational circuit consisting of fluidic elements. The detecting sensor causes variation in the pressure of a control fluid supplied to the operational circuit. The variation of pressure, depending on the rotational speed of vehicle wheels, serves to detect the vehicle speed from the pressure in the control fluid.
Claims4
A vehicle speed detecting sensor, for an anti-lock hydraulic brake control system including a master cylinder, wheel brake cylinders and hydraulic lines interconnecting the master cylinder and the wheel brake cylinders, said sensor comprising, in combination, a casing defining a cylindrical vortex chamber having a circumferential wall interconnecting axially spaced end walls;
- a rotor rotatably mounted in said vortex chamber on one end wall of said casing and having a cylindrical peripheral wall facing and spaced radially from said circumferential wall;
- a transmission connecting said rotor to the driving system of the vehicle for rotation at an angular velocity proportional to the vehicle speed;
- a pressure fluid inlet opening tangentially of said vortex chamber through said circumferential wall and in the direction of rotation of said rotor;
- a pressure fluid outlet opening axially of said vortex chamber through the other end wall of said casing;
- exhaust port means opening through said circumferential wall;
- a source of fluid under pressure connected to said pressure fluid inlet;
- and an operational circuit, including fluid elements, connected to said pressure fluid outlet and in flow-controlling relation with said hydraulic lines interconnecting said master cylinder to said wheel brake cylinders;
- whereby the fluid pressure at said pressure fluid outlet is proportional to the angular velocity of said rotor and thus to the vehicle speed.
Dependencies are inferred from the claim text.