| 摘要 |
<p>PURPOSE:To prevent slippage and burning of a frictional material by driving a throttle valve by means of a solenoid valve, and providing an exhaust brake operating state detecting means for detecting the ON/OFF state of an exhaust brake, in addition to various detecting means. CONSTITUTION:A signal arithmetically processed by a microcomputer 6 is outputted to the coil 8 of a solenoid valve, which then drives a throttle valve 10. When a determined value or more of vehicle speed 1, a determined value or more of throttle opening 2, and operation of an exhaust brake 3 are judged, the micro computer 6 energizes and controls the solenoid valve in the direction increasing the oil pressure of a hydraulic circuit, and by controlling the pressure of the throttle valve 10, the oil pressure to be added to the hydraulic circuit is increased to an optimum height. Hence, torque capacity of the frictional material of a clutch and a brake at the time of operating the exhaust brake is ensured, whereby slippage and burning of the frictional material can be prevented to increase durability.</p> |
