Vehicle control device

Abstract

A vehicle control device comprises a motor, a transmission unit, a temperature sensor for detecting the temperature of the motor, a vehicle speed sensor for detecting the speed of the vehicle, and a control unit. The control unit controls switching of the transmission unit on the basis of a first temperature that is obtained by determining the temperature at which the transmission unit is to be switched from connection to disconnection according to the vehicle speed, and a second temperature that is obtained by determining the temperature at which the transmission unit is to be switched from disconnection to connection according to the vehicle speed. The first temperature is lower as the vehicle speed is higher. The control unit switches the transmission unit from connection to disconnection on the basis of the first temperature, and then switches the transmission unit from disconnection to connection on the basis of the second temperature.

Description

technical field [0001] The present disclosure relates to vehicle control devices. Background technique [0002] In a vehicle running with the driving force of a motor such as a hybrid vehicle or an electric vehicle, for example, as disclosed in Japanese Patent No. 4345593, a clutch is provided between the motor and the wheels. By connecting this clutch, the rotational force of the motor is transmitted to the wheels to drive the vehicle, and on the other hand, the rotational force of the wheels is transmitted to the motor to recover regenerative energy (for example, refer to paragraphs 0017 to 0020 of Japanese Patent No. 4345593, Figure 5 Wait). In addition, when the vehicle speed reaches the maximum rotational speed of the motor or the temperature of the motor reaches a predetermined upper limit temperature, the clutch is disengaged, thereby preventing an excessive load from being applied to the motor. [0003] In order to maximize the function of the motor, in the structu...

AI Technical Summary

Problems solved by technology

However, since the stator temperature T exceeds the lower limit temperature T at the moment when the deceleration starts min , so the clutch cannot be brought into the connected state

Therefore, during the period from the start of deceleration until the clutch is connected (from time t 2 to t 3 ), the regenerative energy that should be recoverable when the clutch is connected cannot be recovered, which causes a decrease in regenerative efficiency

In particular, in a region where the vehicle speed V is high, regenerative energy can be recovered with high efficiency. Therefore, regenerative energy cannot be recovered in this high-speed region, resulting in a particularly large loss in regenerative efficiency.

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