EGR rate calculation method, device, vehicle terminal and storage medium

Abstract

The invention discloses an EGR rate calculation method, device, a vehicle terminal and a storage medium. The EGR rate calculation method comprises the step that the gas flow of in a current cycle entering an inlet manifold through a throttle valve, a carbon tank and a crankshaft ventilation box is obtained; the EGR rate of gas through the throttle valve, the EGR rate of gas of the carbon tank entering the inlet manifold and the EGR rate of gas of the crankshaft ventilation box entering the inlet manifold are obtained according to the gas flow through the throttle valve, the gas flow of the carbon tank entering the inlet manifold and the gas flow of the carbon tank entering the inlet manifold; the calculated step size of the EGR rate of a mixing cavity in a previous cycle and the EGR rate of the mixing cavity of the current cycle is obtained; and according to the EGR rate of the gas through the throttle valve, the EGR rate of the gas of the carbon tank entering the inlet manifold, the EGR rate of the gas of the crankshaft ventilation box entering the inlet manifold, the EGR rate of the mixing cavity in the previous cycle and the calculation step size, the EGR rate of the mixing cavity in the current cycle is obtained, the accurate EGR rate can be obtained quickly, and the predicted failure can be avoided.

Description

technical field [0001] The invention relates to the technical field of vehicles, in particular to a calculation method, device, vehicle-mounted terminal and storage medium of an EGR rate. Background technique [0002] Against the backdrop of increasing fuel consumption requirements for gasoline engines, low-pressure exhaust gas recirculation technology (LP-EGR) is considered to be one of the feasible methods to reduce fuel consumption. When using LP-EGR technology, it is necessary to precisely control the EGR rate, otherwise it will lead to misfires , early combustion, inaccurate control of air-fuel ratio, failure to meet expected fuel consumption and a series of problems. [0003] When performing LP-EGR closed-loop control, it is necessary to obtain the real EGR rate, and compare it with the target EGR rate in real time for closed-loop control, so it is necessary to obtain accurate feedback of the real EGR rate, because there is currently no sensor on the market that can di...

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Problems solved by technology

[0006] In view of the above-mentioned problems in the prior art, the object of the present invention is to provide a calculation method, device, vehicle terminal and storage medium of the EGR rate, which can solve the problem in the prior art that the delay in the calculation of the EGR rate causes the performance of the vehicle to decline.

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