A method for controlling gas path torque at engine idle speed

Abstract

The present invention relates to the technical field of engine idle speed control, and discloses a method for engine idle speed control air path torque, comprising the following steps: S1: judging whether to activate idle speed closed-loop control, if yes, execute step S2, if not, then do not request the idle speed air path Torque; S2: According to the initial value J of the moment of inertia of the engine Engine And the fixed rate of change of moment of inertia ΔJ CreepDelta Obtain the moment of inertia J in the idle closed-loop control, and determine the reserve torque time constant λ according to f and k; S3: According to λ, the intake system time constant τ Air and J are calculated to obtain the P-term parameter, D-term parameter and I-term parameter of PID control; S4: Calculate the P-term torque M of the gas path reserve torque according to the P-term parameter, D-term parameter and I-term parameter P , D item torque M D and I torque M I ;S5: according to M P , M D and M I Calculate the idle air path torque M AirFinal . It can solve the problems in the prior art that conventional PID control is used to control the torque of the gas path, there are many control parameters, the calibration is complicated, and the calibration engineer needs to do a lot of calibration work.

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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