Shutdown control method and device for automobile engine
A technology of automobile engine and control method, which is applied in the direction of combustion engine, internal combustion piston engine, motor vehicle, etc., to achieve the effect of reducing impact, reducing impact, stable and smooth without dragging
Active Publication Date: 2017-12-19
SAIC MOTOR
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Problems solved by technology
[0005] The problem to be solved by the present invention is that the prior art cannot stop the engine at high speeds, which can not only improve fuel economy, but also reduce the impact of engine shutdown at high speeds on the drive train of the vehicle.
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[0037] In the prior art, since the hybrid electric vehicle needs to decelerate the engine and cut off the oil or even shut down the engine under the coasting or braking conditions, but the speed of the engine is high when the engine enters the oil cutoff and shutdown at high speeds, and the process of engine shutdown will affect the whole vehicle. The drive train brings a large impact, causing the whole vehicle to vibrate, thus affecting the driver's driving experience.
[0038] In order to solve the above problems, the technical solution of the present invention provides a method for controlling the shutdown of the engine at a high speed of a hybrid electric vehicle, which can adopt a strategy of shutting down the engine under conditions such as coasting or braking to improve fuel economy , also through a reasonable strategy to open the clutch to disconnect the connection with the engine to increase the energy recovery ratio, and at the same time effectively control the engine...
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The invention discloses a method and an apparatus for shutdown control of a vehicle engine, wherein the method comprises: carrying out shutdown operations to the engine when successively meeting the decelerating oil-cut condition and a first shutdown condition or when not meeting the decelerating oil-cut condition but the second shutdown condition; the shutdown operations to the engine that are carried out comprises: reducing the torque of the engine and separating a clutch; carrying out a first oil-cut operation to the engine when the clutch is completely separated; recovering oil supply for the engine when the rotation speed of the engine is reduced to within the idle speed point range; and carrying out a second oil-cut operation to the engine after the running time of the engine idle speed reaches the first time threshold value, so as to make the engine freely shutdown. According to the technical solution of the invention, during the process that the engine is shut down at high vehicle speed, the fuel efficiency is improved and the impact of the shutdown of the engine at the high rotation speed to the whole vehicle transmission system is reduced.
Description
technical field [0001] The invention relates to the technical field of automobile control, in particular to a method and device for controlling shutdown of an automobile engine. Background technique [0002] With the increasing international attention to energy security and environmental protection issues, countries have become more and more strict on vehicle emissions. Reducing dependence on energy and realizing energy conservation and emission reduction has become an urgent problem to be solved for the sustainable development of the world economy. Hybrid vehicles and pure electric vehicles have become the development trend of today's automobile industry. The gasoline-electric hybrid vehicle combines the motor and the engine, and realizes reasonable energy-saving and emission-reduction effects, idling shutdown, motor start, intelligent charging, regenerative braking, motor assist, electric crawling and other hybrid functions for various working conditions. The advantages ...
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IPC IPC(8): B60W20/10B60W20/40B60W10/06B60W10/02
CPCY02T10/40
Inventor 马成杰林潇赵沂姜博
Owner SAIC MOTOR