Engine control method, engine assembly and vehicle

Abstract

The invention provides an engine control method, an engine assembly and a vehicle. The engine control method comprises the steps that air enters an air inlet of an engine; detecting whether the engine enters a light-off working condition or not; and if the engine enters the ignition working condition, an oil sprayer of the engine is controlled to conduct intermittent oil spraying according to the preset frequency and the preset single-time oil spraying duration, and the total amount of oxygen entering the engine from the air inlet is larger than the total amount of oxygen needed by combustion of oil sprayed out of the oil sprayer. According to the engine control method, the engine assembly and the vehicle, the content of HC and CO in waste gas can be reduced while a secondary air injection system is omitted and the tension degree of the arrangement space in a cabin is relieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to an engine control method, an engine assembly and a vehicle. BACKGROUND

[0002] An engine is an important component of a vehicle. During operation of the engine, exhaust gas containing hydrogen carbide (hereinafter referred to as HC) and carbon monoxide (hereinafter referred to as CO) is discharged. In order to reduce the HC and CO in the exhaust gas, a secondary air injection system is usually provided in the prior art to be connected with the engine, so as to supplement air into the exhaust gas during the exhaust process, so that the oxygen in the air and the HC and CO in the exhaust gas further combust to form H2O and CO2.

[0003] However, it is found in the actual design and assembly process that, since the secondary air injection system includes multiple components such as a pump and a valve, a certain space needs to be occupied in the engine compartment, resulting in that the layout space in the engine compartment is relatively tight. SUMMARY

[0004] The present application provides an engine control method, an engine assembly and a vehicle, which can reduce the HC and CO content in the exhaust gas while eliminating the secondary air injection system and relieving the tightness of the layout space in the engine compartment.

[0005] The present application provides an engine control method, which comprises:

[0006] Intake of air into an intake port of an engine;

[0007] Detection of whether the engine enters a light-off condition;

[0008] If the engine enters the light-off condition, intermittent injection of oil is performed on the oil injector of the engine according to a preset frequency and a preset single injection time length, and the total amount of oxygen entering the inside of the engine from the intake port is greater than the total amount of oxygen required for combustion of the oil injected from the oil injector.

[0009] The engine control method described above, wherein the total amount of oxygen entering the inside of the engine from the intake port is greater than 1.5 times the total amount of oxygen required for combustion of the oil injected from the oil injector.

[0010] The engine control method described above, wherein the preset frequency is 1 hz to 100 hz.

[0011] The engine control method described above, wherein the preset single injection time length is 0 s to 100 s.

[0012] The engine control method as claimed in any one of the preceding embodiments, wherein before detecting whether the engine enters the light-off condition, the engine control method further comprises:

[0013] detecting whether the engine starts;

[0014] if the engine starts, the fuel injector of the engine enters a ready-to-inject state, and if the engine does not start, the fuel injector of the engine enters a fuel injection prohibited state.

[0015] The engine control method as claimed in any one of the preceding embodiments, wherein before detecting whether the engine starts, the engine control method further comprises:

[0016] reversely driving the engine at a preset rotational speed to start the engine.

[0017] The engine control method as claimed in any one of the preceding embodiments, wherein the preset rotational speed is 1000 r / min to 2000 r / min.

[0018] The engine control method as claimed in any one of the preceding embodiments, wherein the engine control method further comprises:

[0019] detecting whether the engine enters a standard operation condition;

[0020] if the engine enters the standard operation condition, the fuel injector of the engine enters a continuous fuel injection state.

[0021] The application further provides an engine assembly, wherein the engine assembly is controlled by the engine control method as claimed in any one of the preceding embodiments.

[0022] The engine assembly comprises:

[0023] an engine;

[0024] a detection module electrically connected to the engine, an air inlet of the engine, a fuel injector of the engine, and a control module; the detection module is capable of detecting an operation condition of the engine, an air intake of the air inlet, and / or a fuel injection amount of the fuel injector;

[0025] a control module electrically connected to the air inlet and the fuel injector; the control module is capable of receiving the operation condition of the engine, the air intake of the air inlet, and the fuel injection amount of the fuel injector detected by the detection module, and adjusting opening and closing of the air inlet, an opening degree of the air inlet, starting and stopping of the fuel injector, a fuel injection frequency of the fuel injector, and / or a fuel injection time length of the fuel injector.

[0026] The application further provides a vehicle, wherein the vehicle comprises the engine assembly as claimed in any one of the preceding embodiments.

[0027] The engine control method, engine assembly and vehicle provided by the embodiment of the present application can provide oxygen required by engine operation through the air inlet, after the engine enters the light-off condition, the fuel injector of the engine is controlled to perform intermittent fuel injection according to a preset frequency and a preset single fuel injection time, and the total amount of oxygen entering the engine from the air inlet is greater than the total amount of oxygen required by the oil liquid burned by the fuel injector, so that the remaining oxygen after the oil liquid is burned can be used for burning HC and CO generated by the oil liquid, thereby effectively reducing the content of HC and CO in the exhaust gas, and the secondary air injection system in the prior art can be omitted, and the tension of the cabin layout space is relieved. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 The flowchart of the engine control method provided by the embodiment of the present application is provided.

[0029] Figure 2 Another flowchart of the engine control method provided by the embodiment of the present application is provided.

[0030] Figure 3 The module diagram of the engine assembly provided by the embodiment of the present application is provided. DETAILED DESCRIPTION

[0031] In order to more clearly understand the above-mentioned purposes, features and advantages of the present disclosure, the schemes of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0032] In the following description, many specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure can also be implemented in other different ways from those described herein; obviously, the embodiments in the description are only some of the embodiments of the present disclosure, not all the embodiments.

[0033] It should be noted that, in this document, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action, without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", "includes", "including", or any other variant thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without more limitations, an element defined by the statement "comprising a" does not exclude the existence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0034] As Figure 1As shown, this application provides an engine control method, wherein the engine control method includes:

[0035] Air is introduced through the engine's air intake to provide oxygen for engine operation and ensure smooth combustion of fuel.

[0036] The purpose of this application is to detect whether the engine has entered the ignition mode. When the engine is in the ignition mode, its operating performance has not reached the standard state. At this time, the oil combustion is incomplete, and the exhaust gas contains a high content of HC and CO. Therefore, this application mainly focuses on further treating the exhaust gas emitted during the ignition mode to reduce the emissions of HC and CO.

[0037] After the engine enters the ignition state, the electronic control unit controls the engine's injectors to intermittently inject fuel according to a preset frequency and a preset injection duration. This ensures that the total amount of oxygen entering the engine through the intake port is greater than the total amount of oxygen required for the combustion of the fuel injected by the injectors. This provides oxygen to the HC and CO produced by fuel combustion, allowing them to further burn into H2O and CO2, thereby reducing the HC and CO content in the exhaust gas. Simultaneously, it eliminates the need for the secondary air injection system found in existing technologies, alleviating the space constraints in the engine compartment. Furthermore, it demonstrates outstanding performance in vehicle NVH (Noise, Vibration, Harshness), diagnostics, durability, and maintainability.

[0038] Specifically, the engine control method provided in this application optimizes the control strategies of the vehicle domain controller and the engine controller, and adjusts the injectors to allow or interrupt the engine's fuel injection action at preset frequencies and preset single injection duration intervals. This achieves the simulation of the control logic of the secondary air injection system. The secondary air injection system supplements oxygen by increasing the intake air for the combustion of HC and CO. In contrast, this application increases the oxygen-to-fuel ratio by intermittent fuel injection, i.e., reducing fuel injection, so that the total amount of oxygen in the intake air can simultaneously support the combustion of fuel and the combustion of HC and CO.

[0039] like Figure 2 As shown, the engine control method provided in this application ensures that the total amount of oxygen entering the engine through the air intake is greater than 1.5 times the total amount of oxygen required for the combustion of the fuel injected by the fuel injector. This guarantees that the total amount of oxygen entering the engine through the air intake is sufficient to support the combustion of the fuel injected by the fuel injector and the HC and CO produced after the fuel combustion, thereby minimizing the HC and CO content in the exhaust gas.

[0040] Optionally, the air intake amount of the engine can be adjusted by adjusting the opening degree of the air intake port, and the fuel injection amount can be adjusted by adjusting the fuel injection parameter of the fuel injector, so that the ratio of the total amount of oxygen entering the engine from the air intake port to the total amount of oxygen required for the combustion of the oil injected by the fuel injector is adjusted.

[0041] As shown in Figure 2 The engine control method provided by the application, wherein the preset frequency is 1 Hz to 100 Hz, and the preset single injection time is 0 s to 100 s. The fuel injector is set to inject oil according to the above-mentioned preset frequency and preset single injection time, which can meet the above-mentioned ratio requirement of the total amount of oxygen entering the engine from the air intake port to the total amount of oxygen required for the combustion of the oil injected by the fuel injector under the condition that the opening degree of the engine air intake port is in multiple states.

[0042] As shown in Figure 2 The engine control method provided by the application, wherein before detecting whether the engine enters the light-off working condition, the engine control method further comprises:

[0043] Detecting whether the engine is started; since the engine can enter the light-off working condition only after starting, first detecting whether the engine is started can ensure the accuracy of the subsequent detection of the light-off working condition.

[0044] If the engine is started, the fuel injector of the engine enters a state of preparing to inject oil, and at this time, whether the engine enters the light-off working condition is detected.

[0045] If the engine is not started, the domain controller sends an instruction to the electronic control unit, and the fuel injector of the engine enters a state of prohibiting oil injection, and at this time, the subsequent step of detecting whether the engine enters the light-off working condition can be directly terminated.

[0046] As shown in Figure 2 The engine control method provided by the application, wherein before detecting whether the engine is started, the engine control method further comprises:

[0047] According to the preset rotating speed, the engine is started by the generator control device.

[0048] Optionally, the preset rotating speed is 1000 r / min to 2000 r / min, so as to ensure that the engine can be started smoothly.

[0049] As shown in Figure 2 The engine control method provided by the application, wherein the engine control method further comprises:

[0050] detect whether the engine enters a standard running condition; if the engine enters the standard running condition, the fuel injector of the engine enters a continuous fuel injection state. After the engine starts, the engine first enters a light-off condition, and then enters the standard running condition. In the standard running condition, the fuel efficiency of the engine is higher than that in the light-off condition, and the engine needs to be stably run. Therefore, in the standard running condition, the fuel injector of the engine continuously and stably injects fuel.

[0051] Optionally, the standard running condition of the engine refers to that the standard running speed of the engine is 2000 r / min to 3000 r / min.

[0052] As shown in Figure 3 The application further provides an engine assembly, wherein the engine assembly is controlled by using the engine control method as described above.

[0053] The engine assembly comprises:

[0054] an engine;

[0055] a detection module, which is electrically connected with the engine, an air inlet of the engine, a fuel injector of the engine and the control module; the detection module can detect the running condition of the engine, the air intake of the air inlet and / or the fuel injection of the fuel injector, so as to detect the running condition of the engine, the air intake of the air inlet and / or the fuel injection of the fuel injector in real time.

[0056] a control module, which is electrically connected with the air inlet and the fuel injector; the control module can receive the real-time data of the running condition of the engine, the air intake of the air inlet and the fuel injection of the fuel injector detected by the detection module, and adjust the opening and closing of the air inlet, the opening degree of the air inlet, the start and stop of the fuel injector, the fuel injection frequency of the fuel injector and / or the fuel injection time length of the fuel injector, so as to realize different fuel injection and air intake strategies in different conditions.

[0057] The engine assembly provided by the application can provide oxygen required for engine running through the air inlet. After the engine enters the light-off condition, the fuel injector of the engine is controlled to intermittently inject fuel according to a preset frequency and a preset single fuel injection time length, and the total amount of oxygen entering the inside of the engine through the air inlet is greater than the total amount of oxygen required for burning the fuel injected by the fuel injector. The remaining oxygen after the fuel is burned can be used for burning HC and CO generated by the fuel combustion, so as to effectively reduce the content of HC and CO in the exhaust gas, and the secondary air injection system in the prior art can be omitted, and the tension degree of the layout space in the cabin is relieved.

[0058] The application further provides a vehicle, wherein the vehicle comprises the engine assembly as described above.

[0059] The vehicle provided by the embodiment of the application can provide oxygen required for engine operation through the air inlet, and after the engine enters the light-off working condition, the fuel injector of the engine is controlled to intermittently spray fuel according to a preset frequency and a preset single spraying time, and the total amount of oxygen entering the engine from the air inlet is greater than the total amount of oxygen required for burning the fuel sprayed from the fuel injector, so that the remaining oxygen after the fuel is burned can be used for burning HC and CO generated by the fuel combustion, thereby effectively reducing the content of HC and CO in the exhaust gas, and the secondary air injection system in the prior art can be omitted, and the tension of the layout space in the cabin is relieved.

Claims

1. An engine control method characterized by, The engine control method comprises: intake of the engine; detecting whether the engine enters a light-off condition; if the engine enters the light-off condition, controlling the fuel injector of the engine to intermittently inject fuel at a preset frequency and a preset single injection duration, and the total amount of oxygen entering the inside of the engine from the intake port is greater than the total amount of oxygen required for the fuel injected from the fuel injector to burn.

2. The engine control method according to claim 1, characterized by, In the process of the engine entering the light-off condition, the total amount of oxygen entering the inside of the engine from the intake port is greater than 1.5 times the total amount of oxygen required for the fuel injected from the fuel injector to burn.

3. The engine control method according to claim 1, characterized by, The preset frequency is any frequency in 1 Hz to 100 Hz.

4. The engine control method according to claim 1, characterized by, The preset single injection duration is any duration in 0 s to 100 s.

5. The engine control method according to any one of claims 1 to 4, characterized by, Before detecting whether the engine enters the light-off condition, the engine control method further comprises: detecting whether the engine is started; if the engine is started, the fuel injector of the engine enters a preparation fuel injection state, and if the engine is not started, the fuel injector of the engine enters a fuel injection prohibition state.

6. The engine control method according to claim 5, characterized by, Before detecting whether the engine is started, the engine control method further comprises: freely rotating the engine at a preset rotating speed to start the engine.

7. The engine control method according to claim 6, characterized by, The preset rotating speed is any rotating speed in 1000 r / min to 2000 r / min.

8. The engine control method according to claim 1, characterized by, The engine control method further comprises: detecting whether the engine enters a standard running condition; if the engine enters the standard running condition, the fuel injector of the engine enters a continuous fuel injection state.

9. An engine assembly characterized by, The engine assembly is controlled by the engine control method according to any one of claims 1 to 8; The engine assembly comprises: an engine; a detection module electrically connected with the engine, an intake port of the engine, a fuel injector of the engine, and a control module respectively; the detection module can detect a running condition of the engine, an intake amount of the intake port, and / or a fuel injection amount of the fuel injector; a control module electrically connected with the intake port and the fuel injector respectively; the control module can receive the running condition of the engine, the intake amount of the intake port, and the fuel injection amount of the fuel injector detected by the detection module, and adjust the opening and closing of the intake port, the opening degree of the intake port, the start and stop of the fuel injector, the fuel injection frequency of the fuel injector, and / or the fuel injection duration of the fuel injector.

10. A vehicle characterized by comprising: The vehicle comprises the engine assembly according to claim 9.

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