Start control method of vane pump of hybrid power transmission

Abstract

The invention provides a start control method of a vane pump of a hybrid power transmission. The control method comprises the following steps: a vehicle controller sends out a vane pump start commandto an oil pump controller; the oil pump controller controls an oil pump motor to start; the oil pump motor drives the vane pump to rotate, so that the vane pump rotating speed is increased from 0 to afirst target rotating speed and the vane pump rotating speed is kept at the first target rotating speed for a certain time; then the oil pump motor rotating speed is controlled, so that the vane pumprotating speed is decreased to a second target rotating speed; whether an oil pressure value of an oil outlet of the vane pump reaches an initial target oil pressure or not is judged, and if so, whether the vane pump is started successfully or not is judged according to whether the oil pressure value of the oil outlet of the vane pump is stable or not and other wise, whether the vane pump is keptat the second target rotating speed or not is determined or whether start of the vane pump fails or not is judged according to whether duration after sending out the vane pump start command by the vehicle controller is shorter than a target protection time of the vane pump or not. The method is simple and feasible, and can reduce the start torque of the oil pump motor and shorten the start time of the vane pump.

Description

technical field [0001] The invention relates to a starting control method of a hybrid transmission vane pump. Background technique [0002] Compared with the scheme of engine-driven oil pump, the scheme of automotive gearbox or transmission motor-driven oil pump in the market has better fuel economy. Starting the oil pump in a low temperature environment is affected by viscous resistance and oil pressure. Overcoming these resistances requires a large driving torque of the oil pump motor, especially the peak torque demand for starting the oil pump motor is large, resulting in an increase in the size and cost of the oil pump motor. At the same time, there are also some hybrid transmissions with hydraulic shifts on the market. In the low temperature environment below -20°C, the driving torque capacity of the oil pump motor is insufficient, and the oil pump cannot be started or the start-up time is too long; It is in the state of idling without oil lubrication for a long time, ...

AI Technical Summary

Problems solved by technology

Starting the oil pump in a low temperature environment is affected by viscous resistance and oil pressure. Overcoming these resistances requires a large drive torque of the oil pump motor, especially when starting the oil pump motor. The peak torque demand is large, resulting in an increase in the size and cost of the oil pump motor

At the same time, there are also some hybrid transmissions with hydraulic shifts on the market. In the low temperature environment below -20°C, the driving torque capacity of the oil pump motor is insufficient, and the oil pump cannot be started or the start-up time is too long; The time is in the state of idling without oil lubrication, which will easily reduce the service life of the oil pump or directly damage the oil pump

At present, the traditional motor-driven oil pump starting methods include starting directly from a static state to the target operating speed, and stepping up from a static state to the target operating speed. The first method requires a relatively large torque for the oil pump motor; the second method method, the required torque of the oil pump motor will decrease, but it will increase the starting time of the oil pump, thereby increasing the waiting time for the car to start

In addition, for the vane pump start-up scheme, it may cause the vane pump to fail to supply oil due to the low target operating speed and insufficient centrifugal force to throw out the vanes.