阅读说明：本技术 混合动力变速箱叶片泵的启动控制方法 (Starting control method of hybrid power gearbox vane pump ) 是由 黄杰 钟发平 高骥 章金乐 于海生 阳华萍 宋东芳 黄刚强 张静 刘先宏 于 2020-04-17 设计创作，主要内容包括：本发明提供了一种混合动力变速箱叶片泵的启动控制方法,整车控制器发出叶片泵启动指令至油泵控制器,油泵控制器控制油泵电机启动,油泵电机带动叶片泵转动使得叶片泵转速从0上升至第一目标转速,保持叶片泵转速在第一目标转速一定时间,然后通过控制油泵电机转速使得叶片泵转速跃至第二目标转速,判断叶片泵出油口的油压值是否达到初始目标油压,若是,则根据叶片泵出油口的油压值是否稳定来判断叶片泵启动成功与否,否则根据整车控制器发出叶片泵启动指令后的持续时间是否小于叶片泵目标保护时间来确定叶片泵继续保持第二目标转速还是判断叶片泵启动失败。本发明方法简单可行,可降低油泵电机的启动扭矩,减少叶片泵启动时间。(The invention provides a starting control method of a hybrid power gearbox vane pump, wherein a vehicle control unit sends a vane pump starting instruction to 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 rotating speed of the vane pump is increased from 0 to a first target rotating speed, the rotating speed of the vane pump is kept at the first target rotating speed for a certain time, then, the rotating speed of the motor of the oil pump is controlled to enable the rotating speed of the vane pump to jump to a second target rotating speed, whether the oil pressure value of the oil outlet of the vane pump reaches the initial target oil pressure or not is judged, if yes, and judging whether the vane pump is started successfully or not according to whether the oil pressure value of the oil outlet of the vane pump is stable or not, and otherwise, determining whether the vane pump continues to maintain the second target rotating speed or judging whether the vane pump is started unsuccessfully or not according to whether the duration time after the vehicle controller sends out a vane pump starting instruction is shorter than the target protection time of the vane pump or not. The method is simple and feasible, can reduce the starting torque of the oil pump motor, and reduces the starting time of the vane pump.)

1. A starting control method of a hybrid power gearbox vane pump is characterized by comprising the following steps: the method comprises the following steps:

s1: the vehicle control unit sends a vane pump starting instruction to the oil pump controller, the oil pump controller controls an oil pump motor to start after receiving the instruction, the oil pump motor drives the vane pump to rotate so that the rotating speed of the vane pump is increased from 0 to a first target rotating speed, then the rotating speed of the vane pump is kept at the first target rotating speed for a certain time t1, then the rotating speed of the oil pump motor is controlled so that the rotating speed of the vane pump is increased to a second target rotating speed, and then the step S2 is executed;

s2: the vehicle control unit judges whether the oil pressure value of the oil outlet of the blade pump reaches the initial target oil pressure, if so, the step S3 is executed; otherwise, executing step S4;

s3: the vehicle control unit judges whether the oil pressure value of the oil outlet of the vane pump is stable, if so, the rotating speed of the oil pump motor is controlled to adjust the rotating speed of the vane pump to the initial target working rotating speed, and the vehicle control unit judges that the vane pump is started successfully; otherwise, the whole vehicle controller judges that the starting of the vane pump fails and sends out an alarm signal;

s4: the vehicle controller judges whether the duration time after the vehicle controller sends the vane pump starting instruction is less than the target protection time t2 of the vane pump, if so, the rotating speed of the vane pump is kept at the second target rotating speed, and the step S2 is executed again; otherwise, the vehicle control unit judges that the starting of the vane pump fails and sends out an alarm signal.

2. The start-up control method of a hybrid transmission vane pump according to claim 1, characterized in that: the first target rotating speed is more than 0 and less than 500rpm, and the second target rotating speed is more than 500rpm and less than 80% of the rated rotating speed of the vane pump.

3. The start-up control method of a hybrid transmission vane pump according to claim 1, characterized in that: if the gearbox is in a parking state, the initial target working rotating speed is 600-800 rpm or 25% -35% of the rated rotating speed of the vane pump; if the gearbox is in the state of getting-off, the initial target working speed is 800-1000 rpm or 45% -55% of the rated speed of the vane pump, and the initial target working speed in the parking state is less than that in the state of getting-off.

4. A method of controlling the start of a hybrid transmission vane pump according to any one of claims 1 to 3, characterized by: the maintaining time t1 of the rotating speed of the vane pump at the first target rotating speed is less than 1s, and the target protection time of the vane pump is 4-6 s.

Technical Field

The invention relates to a starting control method of a hybrid power gearbox vane pump.

Background

Compared with the scheme of driving the oil pump by the engine, the scheme of driving the oil pump by the motor of the automobile gearbox or the transmission in the market has better fuel economy. Starting the oil pump in low temperature environment is influenced by viscous resistance and oil pressure, and overcoming the resistance requires large oil pump motor driving torque, especially the peak torque requirement of starting the oil pump motor is large, resulting in the increase of the size and cost of the oil pump motor. Meanwhile, some hybrid power gearboxes with hydraulic gear shifting appear in the market, and under the low-temperature environment of lower than-20 ℃, the driving torque capacity of an oil pump motor is insufficient, and an oil pump cannot be started or the starting time is too long; the starting time is long, the oil pump is in an idle oil-free lubrication state for a long time, and the service life of the oil pump is easily shortened or the oil pump is directly damaged. At present, the traditional starting method of the motor-driven oil pump includes the steps of starting from a static state directly to a target working rotating speed and increasing from the static state to the target working rotating speed, and the first method has larger required torque for an oil pump motor; in the second method, the torque required of the oil pump motor is reduced, but the start time of the oil pump is increased, thereby increasing the vehicle start waiting time. In addition, for the vane pump starting scheme, the situation that the vane pump cannot supply oil due to the fact that the target working rotating speed is too low and the vanes are not thrown out by enough centrifugal force can be caused.

Disclosure of Invention

The invention aims to provide a simple and feasible starting control method of a hybrid transmission vane pump, which can accurately control, reduce the starting torque of an oil pump motor, reduce the starting time of the vane pump and avoid the damage to the vane pump caused by the long-time idling of the vane pump.

The invention is realized by the following scheme:

a starting control method of a hybrid power gearbox vane pump is carried out according to the following steps:

s1: the vehicle control unit sends a vane pump starting instruction to the oil pump controller, the oil pump controller controls an oil pump motor to start after receiving the instruction, the oil pump motor drives the vane pump to rotate so that the rotating speed of the vane pump rises from 0, namely a static state, to a first target rotating speed, then the rotating speed of the vane pump is kept at the first target rotating speed for a certain time t1, then the rotating speed of the vane pump is controlled to jump to a second target rotating speed, and then step S2 is executed;

s2: the vehicle control unit judges whether the oil pressure value of the oil outlet of the blade pump reaches the initial target oil pressure, if so, the step S3 is executed; otherwise, executing step S4; the oil pressure value of the oil outlet of the vane pump is obtained by monitoring a pressure sensor arranged on the oil outlet of the vane pump, and the pressure sensor transmits monitoring data to the whole vehicle controller;

s3: the vehicle control unit judges whether the oil pressure value of the oil outlet of the vane pump is stable, if so, the rotating speed of the oil pump motor is controlled to adjust the rotating speed of the vane pump to the initial target working rotating speed, and the vehicle control unit judges that the vane pump is started successfully; otherwise, the vehicle control unit judges that the vane pump fails to start and sends an alarm signal, and can preliminarily judge the reasons of insufficient oil in the gearbox or unsmooth oil absorption of the vane pump and the like, so that the vane pump is protected from being damaged due to long-time idling; generally, if the actually measured wave peak and wave trough oil pressures do not exceed 10% of the target oil pressure and the oil pressure curve is smooth and has no obvious pressure inflection point, the oil pressure value of the oil outlet of the vane pump is judged to be stable, otherwise, the oil pressure value of the oil outlet of the vane pump is judged to be unstable; the actual rotating speed of the vane pump is possibly less than the initial target working rotating speed or more than the initial target working rotating speed due to the influence of factors such as oil temperature, parking time and cleanliness of the oil absorption filter;

s4: the vehicle controller judges whether the duration time after the vehicle controller sends the vane pump starting instruction is less than the target protection time t2 of the vane pump, if so, the rotating speed of the vane pump is kept at the second target rotating speed, and the step S2 is executed again; otherwise, the vehicle control unit judges that the starting of the vane pump fails and sends out an alarm signal.

Further, the first target rotating speed is greater than 0 and less than 500rpm, and the second target rotating speed is greater than 500rpm and less than 80% of the rated rotating speed of the vane pump. The second target rotating speed is set, so that the blades of the vane pump have enough centrifugal force to overcome friction force and throw the blades out quickly, and the self-sucking force and the exhaust speed of the vane pump are increased.

Further, if the gearbox is in a parking state, the initial target working rotating speed is 600-800 rpm or 25% -35% of the rated rotating speed of the vane pump; if the gearbox is in a state of getting-off, namely a non-parking state, the initial target working speed is 800-1000 rpm or 45% -55% of the rated speed of the vane pump, and the initial target working speed in the parking state is less than that in the state of getting-off.

Further, the maintaining time t1 of the rotating speed of the vane pump at the first target rotating speed is less than 1s, and the target protection time of the vane pump is 4-6 s.

The starting control method of the hybrid transmission vane pump is simple and feasible, the vehicle control unit compares the obtained pressure value of the oil outlet of the vane pump, the rotating speed value of the oil pump controller and the instruction sending time value with the preset initial target oil pressure, the first target rotating speed, the second target rotating speed and the target protection time of the vane pump, judges the starting state of the vane pump according to the comparison result, adjusts the instruction of the vehicle control unit, and can accurately control the starting state of the vane pump, so that the starting torque of an oil pump motor is reduced, the starting time of the vane pump is shortened, and the damage to the vane pump caused by the long-time idle rotation of the vane pump can be avoided.

Detailed Description

The present invention will be further described with reference to the following examples, but the present invention is not limited to the description of the examples.