Power transmission controller for vehicle

Abstract

A vehicular power-transmission control system comprises a continuously variable transmission CVT, which transmits the output of an engine E to wheels, a starting clutch 5, which controls the transmission of power in the continuously variable transmission, an electrical motor generator M, which can assist the engine in rotational drive, and a hydraulic pump P, which is connected to the output shaft of the engine. When the vehicle, which has come into a halt with the engine consequently stopped in an idling elimination control, is to be restarted, the power-transmission control system controls the electrical motor generator to rotate the output shaft of the engine, to which fuel supply is not allowed, thereby to drive the pump. Thereafter, when the starting clutch receiving a hydraulic pressure from the hydraulic pump starts its engagement, the power-transmission control system starts the operation of the engine.

Description

technical field [0001] The present invention relates to a device for controlling the power transmission of a power transmission system capable of controlling the idling stop of the engine when the vehicle is stopped. Characteristic power transmission control device. Background technique [0002] The structure of transmitting the driving force of the engine to the wheels through the power transmission device to drive the vehicle is generally used in motor vehicles and the like. Recently, in order to improve fuel efficiency and the like, idling stop control (idling stop) is performed to stop the engine when the vehicle is stopped. control) in many cases (for example, refer to Japanese Patent No. 3011069 and Japanese Patent Laid-Open No. 2000-272380). [0003] However, the power transmission device is generally equipped with hydraulically actuated frictional engagement members (hydraulic clutches, hydraulic brakes, etc.), and controls the transmission of driving force from the...

AI Technical Summary

Problems solved by technology

[0005] However, in the device disclosed in Japanese Patent No. 3011069, when the vehicle repeatedly idling, stopping, and starting, the motor generator generates too much heat, and there is a risk of overheating, and there is a problem that the durability of the motor generator may decrease.

In addition, when the motor generator is overheated, the safety device is activated, and the idling stop control is prohibited, which causes the problem of a decrease in fuel efficiency.

In addition, the motor generator has the function of assisting the driving force of the engine at the time of starting, but in the case of controlling the excessive increase in the engine revolution by the motor generator as described above, it is necessary to perform control so that the motor generator assists the engine drive immediately thereafter. Switching, but it is difficult to set the control switching time, and there is a problem that the switching may be slow, resulting in a decrease in drivability

[0006] In addition, in the device disclosed in the above-mentioned JP-A-2000-272380, a device for controlling the opening degree of the engine throttle independently of the operation of the accelerator pedal is required, and there is a problem that the engine control system is complicated.

In addition, immediately after the frictional engagement member is engaged, it is necessary to change the engine throttle rapidly before reaching the position corresponding to the operation of the accelerator pedal, and the operation of the accelerator pedal does not correspond to the change in the engine rotation speed, causing a problem of discomfort to the driver.

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