Automatic speed ratio control system for stepless transmission of automotive vehicles
US4253347A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 1, 1978 |
| Grant date | Mar 3, 1981 |
| Priority date | — |
| Expiry date | Aug 1, 1998 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H61/462
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
An automatic speed ratio control system of the integration servo mechanism type for a stepless transmission of an automotive vehicle. Speed ratio is controlled by a hydraulic pump motor of variable displacement type, which in turn is controlled by an actuator having a piston and a cylinder to which hydraulic oil is supplied. The system comprises a target value generator which produces a target value for an engine speed corresponding to a throttle opening or an output torque of an engine, or which produces a target value for an engine output torque corresponding to a throttle opening or an engine speed; a detector for producing a signal indicative of an engine speed or an output torque of an engine; a control signal generator for comparing the signal from the detector against the signal from the target value generator to produce a control signal in accordance with a deviation therebetween; and a controller responsive to the control signal to drive the actuator to change a speed ratio of the stepless transmission. The system is characterized by further comprising means for controlling a gain of the alteration rate of the speed ratio in response to a rotational speed of an output shaf…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.