Control method for starting engine by using clutch of deep hybrid power automobile

A hybrid electric vehicle and control method technology, applied in hybrid electric vehicles, motor vehicles, transportation and packaging, etc., can solve problems such as explosive torque uncertainty, drive train torque disturbance, and poor consistency of the whole vehicle. Achieve the effect of improving driving comfort, realizing heat balance, and preventing vehicle shaking

Active Publication Date: 2018-09-11
科力远混合动力技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The impact of the engine starting process of the deep hybrid synthesis box directly affects the driving experience of the car. For example, the invention patent with the patent No. 200910194470.5 discloses a dual-planetary four-shaft hybrid transmission device. There are two starting shocks, one is the low-speed pulsating resistance torque caused by the pumping loss during the engine starting process, and the other is the explosive torque generated by the engine fuel injection and ignition, which produces torque disturbance to the drive train and causes torque fluctuations of the vehicle
In the prior art, the series hybrid power system, because the engine crankshaft is directly connected with the gearbox shaft, can not shield the vibration problem caused by the sudden change of the engine torque on the output shaft of the gearbox when the engine fuel injection is ignited. The air volume and fuel injection volume are still in the open-loop control stage, and the explosive torque generated is uncertain, which leads to poor consistency of vehicle smoothness

Method used

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  • Control method for starting engine by using clutch of deep hybrid power automobile
  • Control method for starting engine by using clutch of deep hybrid power automobile
  • Control method for starting engine by using clutch of deep hybrid power automobile

Examples

Experimental program
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Embodiment 1

[0037] A control method for clutch starting engine of a deep hybrid electric vehicle, the control flow chart of which is as follows figure 1 shown, proceed as follows:

[0038] S1: The starting demand judging module obtains the current power battery power, expected wheel torque and vehicle speed. If the power battery power is less than the preset value A or the expected wheel torque is less than the preset value B and the vehicle speed is greater than the preset value C at the same time, where A is 30%, B is -50Nm, and C is 30km / h, then the starting demand judging module judges that the engine starting demand is yes, and executes step S2; otherwise, the vehicle maintains the pure electric mode operation;

[0039] S2: The vehicle controller controls the solenoid valve current to fill the first clutch with a constant pressure P1, P1 is 3.5bar, until the first clutch C1 is filled with oil, and controls the pressure of the first clutch to be the joint point pressure P2, P2 is 1.5...

Embodiment 2

[0055] A control method for clutch starting engine of deep hybrid electric vehicle, its method steps are similar to the steps of the control method for clutch starting engine of deep hybrid electric vehicle in embodiment 1, the difference is: in step S1, A is 25 %, B is -60Nm, C is 60km / h; in step S2, the constant pressure P1 is 5bar, the joint point pressure P2 is 1.0bar, and the preset expected speed of the first planetary carrier is n VM_soll is 1500rpm; t in steps S2-S5 lim is 8s; in step S3, the engine resistance torque is -40Nm, the engine inertia torque is calculated as -90Nm, and the preset engine fuel injection ignition speed threshold n is 500rpm; in steps S4 and S5, the preset engine first target Torque T vm_1 is 10Nm; in step S6, the preset engine second target torque T vm_2 is 200Nm; in step S5, the preset value D is 40rpm; in step S7, the preset failure times threshold E is 2 times, and the preset delay time threshold F is 1.5s.

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PUM

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Abstract

The invention provides a control method for starting an engine by using a clutch of a deep hybrid power automobile. The method comprises the steps that whether or not starting demands of the engine are met is judged by a starting demand judging module, if yes, the steps of oil filling of a first clutch, the dragging of an engine of the first clutch, oil spraying control of the engine, PI controlling and first clutch closing are sequentially conducted, and the starting of the engine is completed; during the oil filling process of the first clutch, starting process time tes of a current engine is judged, slipping work Q of a unit area of a current first clutch and the starting process time tes of the engine are judged in the steps of the dragging of the engine of the first clutch, the oil spraying control of the engine and the PI controlling, if judging results exceed limiting values, current steps are ceased, whether or not judging failing times are exceeded is judged, and judging stepsof the starting demands of the engine are executed again or a fault mode is entered according to judging results. The method is easy and achievable, and the smoothness of the starting process of theengine can be ensured to prevent the shaking of the automobile.

Description

technical field [0001] The invention relates to a control method for starting an engine of an automobile, in particular to a control method for a clutch starting engine of a deep hybrid electric vehicle. Background technique [0002] With the growth of population and economy, energy and environmental issues have prompted countries to develop new energy vehicles, energy-saving and environment-friendly vehicles. Hybrid electric vehicles are energy-saving and environmentally friendly, and have a broad market space and good development prospects. [0003] Hybrid vehicles have the function of starting and stopping the engine, and the working conditions of starting the engine are very frequent. At the same time, in order to obtain better fuel consumption, clutches and brakes are added to realize the shift function and optimize the working point of the engine. Therefore, the impact of starting the engine on power and economy is very important. [0004] The impact of the engine st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60W20/40B60W20/15
CPCB60W20/15B60W20/40B60W2710/06
Inventor 夏鹏飞钟发平王晨刘国志于海生张彤易显科
Owner 科力远混合动力技术有限公司
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