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Vehicle emission control method and vehicle
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An emission control and vehicle technology, which is applied in the field of vehicles, can solve the problems of substandard exhaust emissions and achieve the effects of ensuring emission standards, improving concentration, and reducing air pollution
Active Publication Date: 2022-04-15
WEICHAI POWER CO LTD
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[0003]
The purpose of the present invention is to provide a vehicle emission control method and a vehicle to solve the problem in the prior art that the exhaust emission of a faulty vehicle during operation is not up to standard
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Embodiment 1
[0043] The invention provides a vehicle, the vehicle includes an OBD system, a control system and an engine system, the OBD system can monitor the failure of the vehicle and give an alarm; the control system can receive and analyze the failure signal sent by the OBD system, and through the OBD system, the vehicle engine The system takes control.
[0044] Specifically, the vehicle further includes a crankshaft speed sensor, which is used to detect the crankshaft speed of the engine.
[0045] Among them, in order to meet the requirements of the OBD emission regulations, the vehicle emission control method in the prior art, when the OBD system detects that the vehicle is faulty, it will send a fault signal to the vehicle control system and give an alarm. However, when the vehicle breaks down, such as misfire or the EGR flow rate is not within the set flow range, in the prior art, the engine system of the vehicle is not controlled after the vehicle breaks down, resulting in the fa...
Embodiment 2
[0065] This embodiment includes the vehicle of Embodiment 1. In the vehicle emission control method of this embodiment, the EGR flow is not within the set flow range as an example, for example figure 2 As shown, the vehicle emission control method of this embodiment includes the following steps.
[0066] S200, the vehicle is powered on.
[0067] S210, judging whether the engine is started;
[0068] If the engine starts, proceed to S220;
[0069] If the engine does not start, start the engine. And go to S220.
[0070] S220, judging whether the vehicle has an OBD failure;
[0071] If the vehicle has an OBD failure, go to S230.
[0072] S230. According to the fault code, it is judged that the OBD fault is engine misfire or the EGR flow rate is not within the set flow range;
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Abstract
The invention belongs to the technical field of vehicles, and discloses a vehicle emission control method and a vehicle. The vehicle emission control method comprises the steps that a vehicle is powered on, and an engine is started; judging whether the vehicle has an OBD fault or not; if the vehicle has the OBD fault, the air-fuel ratio of the engine is corrected according to the correction coefficient; wherein the OBD fault comprises engine misfire and / or the EGR flow is not in a set flow range; the correction coefficient comprises a misfire correction coefficient or an EGR flow correction coefficient, the misfire correction coefficient is at least determined by the crankshaft acceleration, and the EGR flow correction coefficient is at least determined by the EGR pressure. Corresponding correction factors are adopted to correct the air-fuel ratio of the engine according to specific fault reasons, so that combustion products of fuel are changed by adjusting the mass ratio of air to fuel in mixed gas in an air cylinder of the engine, and the concentration of oxynitride in tail gas after a vehicle breaks down is improved. And the emission of tail gas after the vehicle breaks down reaches the standard.
Description
technical field [0001] The invention relates to the technical field of vehicles, in particular to a vehicle emission control method and a vehicle. Background technique [0002] In order to meet the requirements of OBD (On-Board Diagnostics) emission regulations, the vehicle emission control method in the prior art, when the OBD system detects that the vehicle fails, it will send a fault signal to the vehicle's control system and give an alarm. . However, when the vehicle breaks down, such as misfire or the EGR flow rate is not within the set flow range, in the prior art, the engine system of the vehicle is not controlled after the vehicle breaks down, resulting in the failure of the vehicle when it is running. Exhaust emissions are not up to standard. Contents of the invention [0003] The purpose of the present invention is to provide a vehicle emission control method and a vehicle, so as to solve the problem in the prior art that the exhaust emission of a faulty vehicl...
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Application Information
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