A VVT initial angle learning control method
An initial angle, learning control technology, applied in the direction of electrical control, engine control, fuel injection control, etc., can solve the problem of improving the effect of limiting emissions, unable to increase water temperature, oil temperature and pressure, etc., to save fuel, reduce particulate matter and Effect of THC emission and improvement of start-up quality
Active Publication Date: 2020-07-10
DONGFENG MOTOR CORP HUBEI
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Therefore, within a period of time (about 20 seconds) after the engine starts, the VVT does not work, and cannot increase the water temperature, oil temperature and pressure, thus limiting the improvement effect of the VVT on emissions during cold start and warm-up.
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[0017] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings. It should be noted here that the descriptions of these embodiments are used to help understand the present invention, but are not intended to limit the present invention.
[0018] The invention provides a VVT initial angle learning control method. In each driving cycle, when the engine is started, the VVT is normally turned on and controlled for a period of time. After the engine enters the deceleration and fuel cut-off working state, it is judged according to the vehicle signal whether the learning requirements are satisfied. Conditions, when the learning conditions are met, VVT initial angle learning starts. Such as figure 1 As shown, t0 is the engine starting time, t1 is the moment when the VVT opening drops to zero, that is, t0-t1 is the time for VVT normal opening control, t1-t2 is the duration time for the VVT opening to be zero, ...
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The invention discloses a VVT initial angle learning control method. In each driving cycle, a VVT is normally started and controlled during starting of an engine; after the engine enters a deceleration fuel cut working state, vehicle signals are used for judging if learning conditions are met; and when the learning conditions are met, the VVT initial angle learning is performed. The VVT is normally started and controlled according to previous learning values or defaulted values in cold startup of the engine; and after the water temperature and the machine oil temperature pressure are increasedwithin the normal range, and the engine enters a gear shifting fuel cut state, the VVT initial angle learning is performed, so that the startup quality can be effectively improved, and the emission effect is improved.
Description
technical field [0001] The invention belongs to the technical field of automobile control, and in particular relates to a VVT initial angle learning control method. Background technique [0002] The principle of engine variable valve timing technology (VVT, Variable Valve Timing) is to adjust the intake (exhaust) amount, valve opening and closing time, and angle according to the operating conditions of the engine, so that the amount of air entering reaches the optimum value and improves combustion efficiency. The initial angle learning is required when the VVT is turned on. In the existing VVT control strategy, the specific method of the initial angle learning is to learn directly after the engine is started. During the learning process, the VVT is prohibited from functioning. After the oil temperature and closed-loop control are basically stable, the initial angle is learned in the stable engine condition. Therefore, within a period of time (about 20 seconds) after the...
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IPC IPC(8): F02D41/00F02D41/06F02D41/24F02D13/02
CPCF02D13/0215F02D41/0002F02D41/064F02D41/2438F02D41/2441F02D41/2451F02D2013/0292F02D2041/001
Inventor 李儒龙王星彭浩张成博李仕成其他发明人请求不公开姓名
Owner DONGFENG MOTOR CORP HUBEI