Method for controlling torque of air circuit at engine idle speed

Abstract

The invention relates to the technical field of engine idle speed control, and discloses a method for controlling a torque of an air circuit at an engine idle speed. The method for controlling the torque of the air circuit at the engine idle speed comprises the following steps that: S1, whether idle speed closed-loop control is activated or not is determined, if yes, step S2 is executed, and if not, a torque of the air circuit at an idle speed is not requested; S2, a moment of inertia J in the idle speed closed-loop control is obtained according to an initial value J<Engine> of the moment of inertia and a fixed change rate [delta]J<CreepDelta> of the moment of inertia of an engine, and a reserve torque time constant lambada is determined according to f and k; S3, a P term parameter, a D term parameter and a I term parameter of PID control are calculated and obtained according to lambada, an air intake system time constant [Tau]<Air> and J; S4, a P term torque M, a D term torque M<D>and a I term torque M of an air circuit reserve torque are calculated according to the P term parameter, the D term parameter and the I term parameter; and S5, according to M, M<D>, and M, the torque M<AirFinal> of the air circuit at the idle speed is calculated. The problem that conventional PID control is used when controlling the torque of the air circuit in the prior art is solved, and the problem that the conventional PID control has many control parameters, complicated calibrations, and has a lot of calibration work that a calibration engineer needs to do is solved.

Description

technical field [0001] The invention relates to the technical field of engine idle speed control, in particular to a method for engine idle speed control gas circuit torque. Background technique [0002] Idle speed refers to the neutral gear, the state when the vehicle is idling without gas pedal. Idle speed is too high, fuel consumption is high, wasteful. The idle speed is too low, the idle speed is unstable or it is difficult to start. Proper idle speed can reliably maintain the minimum speed of engine operation. Idling speed fluctuations will have an impact on the comfort of the occupants, emissions, fuel consumption, and NVH. Moreover, due to the processing deviation of the engine during the manufacturing process, the aging and wear of the engine during actual use, the quality of the oil, the interference of different electrical loads, the different combustion modes of the engine, and the discontinuous combustion of the engine in different cylinders, it will affect th...

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Problems solved by technology

[0005] Aiming at the defects existing in the prior art, the object of the present invention is to provide a control method for engine idling fire path torque, which can solve the problem that when the existing idling air path torque control method adopts PID control, there are many control parameters and complicated calibration. Calibration engineers need to do a lot of calibration work

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