Low-emission and high-power starting control method for diesel engine vehicles

Abstract

The invention relates to the field of vehicle running control, in particular to a starting control method of a diesel engine vehicle, and discloses a low-emission and high-power-performance starting control method of a diesel engine vehicle. The method comprises the steps that EGR has the starting exhaust gas recirculation amount and the running exhaust gas recirculation amount; and the starting time is set, control is carried out according to signals transmitted by a transmission control unit (TCU), and according to control, in a normal state, the running exhaust gas recirculation amount is selected as the exhaust gas recirculation amount of the EGR, when an engine control unit (ECU) obtains a starting signal, the exhaust gas recirculation amount of the EGR is adjusted to the starting exhaust gas recirculation amount within the starting time, and the exhaust gas recirculation amount is adjusted back to the running exhaust gas recirculation amount till the starting time is up. According to the method, after the starting time is calibrated, the instant oil injection amount is adopted in the starting stage of the vehicle to control the exhaust gas recirculation amount of the exhaust gas recirculation (EGR), the performance of the vehicle in the starting stage is greatly improved, meanwhile, the overall emission of the vehicle cannot be increased due to the fact that the time period is short, and the newest emission regulation requirements can be met as well.

Description

technical field [0001] The invention relates to the field of vehicle running control, in particular to a method for controlling the start of a diesel engine vehicle. Background technique [0002] A kind of diesel engine vehicle that adopts AMT gearbox has appeared in the prior art. With the intensification of environmental pollution and global warming, more and more stringent emissions have been introduced one after another. In order to meet the increasingly stringent emission regulations, the technical route of light-duty diesel engines generally adopts high-pressure common rail fuel injection system + exhaust gas recirculation system EGR + diesel particles Filter DPF; When the exhaust gas circulation volume of EGR is set higher, the amount of air entering the cylinder will be reduced, resulting in a smaller instantaneous maximum torque that the engine can deliver, and when the setting is lower, it often cannot meet the existing emission regulations, such as The latest die...

AI Technical Summary

Problems solved by technology

With the intensification of environmental pollution and global warming, more and more stringent emissions have been introduced one after another. In order to meet the increasingly stringent emission regulations, the technical route of light-duty diesel engines generally adopts high-pressure common rail fuel injection system + exhaust gas recirculation system EGR + diesel particles Filter DPF; When the exhaust gas circulation volume of EGR is set higher, the amount of air entering the cylinder will be reduced, resulting in a smaller instantaneous maximum torque that the engine can deliver, and when the setting is lower, it often cannot meet the existing emission regulations, such as The latest diesel Euro 5 emission regulations, so it is necessary to adjust the control strategy of the vehicle, balance the emission and starting dynamics, and greatly improve the starting ability of the vehicle without affecting emissions

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