Power steering system
AssigneeKayaba Industry Co., Ltd.
InventorsNoboru Shimizu, Tsunefumi Arita, Naoto Shima, Masashi Takai
Life of this patent
Estimating the term…
Abstract
Provision of a power steering system which is capable of preventing a delay in response for outputting a solenoid current instruction value SI. A controller C stores a table of basic current instruction values I1 corresponding to combinations of steering angles and steering angular velocities. The controller C obtains a basic current instruction value I1 from the table, and multiplies the obtained basic current instruction value I1 by a current instruction value I2 determined on the basis of a vehicle speed, and then determines the multiplied value as a solenoid current instruction value SI.
Claims6
A power steering system, characterised by:
- a steering valve (9) for controlling a power cylinder (8);
- a variable orifice (a) provided upstream from the steering valve (9);
- a solenoid (SOL) for controlling a degree of opening of the variable orifice (a);
- a controller (C) for controlling a solenoid current instruction value (SI) used for driving the solenoid (SOL);
- a steering angle sensor (14) and a vehicle speed sensor (15) which are connected to the controller (C);
- and
- a flow control valve (V) for distributing a flow supplied from a pump (P), to a control flow supplied to the steering valve (9) in accordance with the degree of opening of the variable orifice (a), and a return flow circulating back to a tank (T) or the pump (P), and
- in that the controller (C) stores a table of basic current instruction values (I1) corresponding to combinations of steering angles and steering angular velocities, and multiplies the basic current instruction value (I1), obtained from the table, by a current instruction value (I2) set on the basis of a vehicle speed for determination of the solenoid current instruction value (SI).
A power steering system, characterised by:
- a steering valve (9) for controlling a power cylinder (8);
- a variable orifice (a) provided upstream from the steering valve (9);
- a solenoid (SOL) for controlling a degree of opening of the variable orifice (a);
- a controller (C) for controlling a solenoid current instruction value (SI) used for driving the solenoid (SOL);
- a steering angle sensor (14) and a vehicle speed sensor (15) which are connected to the controller (C);
- and
- a flow control valve (V) for distributing a flow supplied from a pump (P) , to a control flow supplied to the steering valve (9) in accordance with the degree of opening of the variable orifice (a), and a return flow circulating back to a tank (T) or the pump (P), and
- in that the controller (C) stores a table of basic current instruction values (I1) corresponding to combinations of steering angles and steering angular velocities, and provides the basic current instruction value (I1), obtained from the table, with a current instruction value (I2) based on a vehicle speed as a limit value, and determines a value below the limit value as the solenoid current instruction value (SI).
Dependencies are inferred from the claim text.