A calculation method, device, vehicle terminal and storage medium for egr rate

Abstract

The invention discloses a calculation method, device, on-board terminal and storage medium for EGR rate. The method includes: obtaining the gas flow rate entering an intake manifold through a throttle valve, a carbon canister and a crankshaft ventilation box in a current cycle; Gas flow, carbon canister gas flow into the intake manifold, and crankshaft ventilation box gas flow into the intake manifold, obtain the EGR rate of the gas passing through the throttle, the EGR rate of the carbon canister gas entering the intake manifold, and the crankshaft ventilation box entering the intake manifold. EGR rate of the gas in the intake manifold; obtain the EGR rate of the mixing chamber in the previous cycle and the calculation step size of the EGR rate in the mixing chamber in the current cycle; The EGR rate of the gas entering the intake manifold from the crankshaft ventilation box, the EGR rate of the mixing chamber in the previous cycle and the calculation step size can be obtained by obtaining the EGR rate of the mixing chamber in the current cycle, which can quickly obtain an accurate EGR rate and avoid prediction failure.

Description

technical field [0001] The present invention relates to the technical field of vehicles, and in particular, to a method, a device, a vehicle-mounted terminal and a storage medium for calculating an EGR rate. Background technique [0002] In the context of increasing requirements for gasoline fuel consumption, low-pressure exhaust gas recirculation (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 misfire , premature 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. Therefore, it is necessary to obtain accurate real EGR rate feedback, because there is currently no sensor on the market that can dire...

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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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