| abstract |
After the engine rotational speed Ne has become below anreference rotational speed Neo, which is lower than an idling rotational speed ofnthe engine, and after the pressure PL of oil passages 103a and 103b has begunnto decrease, for a predetermined time, the currents supplied to electromagneticnvalves 45 and 46 are adjusted to generate, in each electromagnetic valve, ansecond biasing force electromagnetically in a magnitude that can supplement andecrease in a third biasing force which is generated by the back pressure lednthrough an oil passage 107 or 108, respectively, and which decreases as thenpressure of the oil passages 103a and 103b decreases. After the abovenmentioned predetermined time has elapsed, the currents supplied to thenelectromagnetic valves 45 and 46 are set almost to zero. |