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Torque control method, device and system for light mixing system

A technology of torque control and target torque, applied in transportation and packaging, hybrid vehicles, mechanical equipment, etc., can solve problems such as poor engine fuel economy, and achieve the effect of improving fuel economy

Active Publication Date: 2018-09-21
GEELY AUTOMOBILE INST NINGBO CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing light hybrid system has the problem of poor fuel economy when the engine is controlling the torque output, and no effective solution has been proposed so far

Method used

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  • Torque control method, device and system for light mixing system
  • Torque control method, device and system for light mixing system
  • Torque control method, device and system for light mixing system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] see figure 1 The structural block diagram of the mild hybrid system is shown, which shows that the main part of the system includes a three-cylinder engine body 10 , an accessory system and a BSG system 30 .

[0036] The accessories of the accessory system are connected by belts and can transmit power to each other. These accessories include a motor pulley 22, an engine pulley 25 and a motor belt 24. The engine pulley 25 is rigidly connected to the crankshaft accessory side of the three-cylinder engine body 10. The BSG system 30 includes a motor body and a motor controller. The BSG system can be used as a generator to charge the battery, and can also be used as a motor to drive other accessories and the engine by using the electric energy of the battery.

[0037] In the embodiment of the present invention, a 48vBSG system is used as an example for illustration, but it may also be a BSG system with a higher voltage. The 48v BSG motor in the embodiment of the present inv...

Embodiment 2

[0039] An embodiment of the present invention provides a torque control method for a mild hybrid system, which is applied to a three-cylinder engine equipped with a BSG motor. see figure 2 In the flow chart of the torque control method of the mild hybrid system shown, the driver can choose whether to start the torque assist mode, and execute the method of this embodiment when starting, the method includes the following steps:

[0040] Step S202, when a torque increase request is received, calculate the torque increase torque and the maximum available torque of the BSG motor in the current situation.

[0041] Wherein, the increased torque is the difference between the target torque corresponding to the increased torque request and the current output torque, and the current output torque is the sum of the torques of the engine and the BSG motor. The torque increase torque is the torque value that needs to be increased in the overall output of the system after receiving the tor...

Embodiment 3

[0068] An embodiment of the present invention provides a torque control method for a mild hybrid system, see Figure 4 The flow chart of the torque control method for the mild hybrid system shown, the method includes the following steps:

[0069] Step S402, judging whether the vehicle has torque increasing requests sent by other controllers. If yes, execute step S404; if no, end. When the torque increase request is obtained, calculate the maximum torque allowed by the BSG; otherwise, continue to maintain the normal operating condition.

[0070] Step S404, calculating the maximum torque allowed by the BSG. The power limitation of the system and whether the power of the BSG is reduced should be considered during the calculation.

[0071] Step S406, calculating the required first relative torque increase. That is, the requested torque increase value - the current torque of the engine. It should be noted that this embodiment assumes that the requested torque increase is absol...

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Abstract

The invention provides a torque control method, device and system for a light mixing system, and relates to the technical field of engine mixing. The method is applied to a three-cylinder engine witha BSG motor, and comprises the steps of calculating torque increasing torque and the maximum available torque of the BSG motor under the current situation when a torque increasing request is received,wherein the torque increasing torque is a difference between a current output torque and a target torque corresponding to the torque increasing request; judging whether the maximum available torque is larger than or equal to the torque increasing torque or not; if yes, controlling the BSG motor to output the torque according to the torque increasing torque; if not, controlling the BSG motor to output the torque according to the maximum available torque and controlling the three-cylinder engine to output the torque according to the difference between the maximum available torque and the targettorque. According to the torque control method, device and system for the light mixing system, the BSG motor is preferentially selected for torque increasing, when the torque of the BSG motor cannotmeet the request completely, the requested torque is met by controlling the engine, and the fuel economy can be improved.

Description

technical field [0001] The present invention relates to the field of engine hybrid technology, in particular to a torque control method, device and system for a mild hybrid system. Background technique [0002] With the rapid development of my country's economy and society, while automobiles bring convenience to people's lives, they also pose new challenges to the country's energy security and environmental protection. Fuel consumption standards and emissions regulations. [0003] Therefore, many automakers are actively promoting the application of three-cylinder engines. By increasing turbocharging technology and reducing engine displacement, they can improve fuel economy and reduce emissions while ensuring the same power as traditional four-cylinder naturally aspirated engines. Meet increasingly stringent regulatory requirements. BSG (Belt Starter Generator, with transmission start-stop device) is added on the basis of the three-cylinder engine. BSG is a mild hybrid techn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60W20/10B60W20/15B60W10/06B60W10/08
CPCB60W10/06B60W10/08B60W20/10B60W20/15B60W2710/0666B60W2710/083Y02T10/40Y02T10/62
Inventor 李洪飞吕登科吴孝勤
Owner GEELY AUTOMOBILE INST NINGBO CO LTD