WO2023227097A1

WO2023227097A1 - Engine starting control method and apparatus, and hybrid vehicle and storage medium

Info

Publication number: WO2023227097A1
Application number: PCT/CN2023/096479
Authority: WO
Inventors: 韩令海; 杨云波; 赵鹏遥; 钟云锋; 郑通; 任亚为; 李国伟; 张学锋; 陈国栋; 王昊
Original assignee: 中国第一汽车股份有限公司
Priority date: 2022-05-27
Filing date: 2023-05-26
Publication date: 2023-11-30
Also published as: CN114909228B; CN114909228A

Abstract

An engine starting control method and apparatus, and a hybrid vehicle and a storage medium, which are used for alleviating the emission problem in an engine starting process, solving the problem of increased emission caused by starting of a hybrid vehicle multiple times, and improving the emission performance of an entire vehicle product. The method comprises: on the basis of a generator of a hybrid vehicle, dragging an engine to rotate, and acquiring rotation speed information of the engine (S110); in response to detecting that the rotation speed information of the engine meets a first preset condition, controlling oil injection and ignition of the engine, and acquiring torque information of the generator (S120); in response to detecting that the torque information of the generator meets a second preset condition, acquiring current vehicle state information, determining a target power of the engine according to the current vehicle state information, and controlling the power of the engine according to the target power and a preset load control duration (S130); and after the preset load control duration, controlling the power of the engine on the basis of an entire vehicle demand power (S140).

Description

An engine start control method, device, hybrid vehicle and storage medium

This application claims priority to the Chinese patent application with application number 202210591973.1, which was submitted to the China Patent Office on May 27, 2022. The entire content of this application is incorporated into this application by reference.

Technical field

Embodiments of the present application relate to vehicle technology, for example, to an engine start control method, device, hybrid vehicle, and storage medium.

Background technique

With the rapid development of hybrid vehicle technology, environmental problems have become increasingly prominent, and vehicle emissions need to be controlled.

Currently, emissions are usually controlled by controlling the temperature of the exhaust catalytic converter. Before the temperature reaches the threshold, emissions are reduced by delaying the engine ignition angle or simply idling the engine.

However, the number of starts and stops of the engine of this kind of hybrid vehicle during driving is much greater than that of a traditional vehicle, resulting in the amount of emissions produced during the engine starting process accounting for a large proportion of the entire driving process.

Contents of the invention

Embodiments of the present application provide an engine start control method, device, hybrid vehicle and storage medium to improve the emission problem during the engine start process, solve the emission deterioration problem caused by multiple starts of the hybrid vehicle, and improve the overall vehicle Product emission performance.

In a first aspect, embodiments of the present application provide an engine start control method, including:

The generator based on the hybrid vehicle drives the engine to rotate and obtains engine speed information;

In response to detecting that the engine speed information satisfies the first preset condition, control engine injection ignition and obtain generator torque information;

In response to detecting that the generator torque information satisfies the second preset condition, current vehicle status information is obtained, the target power of the engine is determined based on the current vehicle status information, and the target power is determined based on the target power and the preset load control duration. Engine power is controlled;

After the preset load control period, the engine power is controlled based on the vehicle power demand.

In a second aspect, embodiments of the present application also provide an engine start control device, including:

The engine speed information acquisition module is configured to drive the engine to rotate based on the generator of the hybrid vehicle to obtain engine speed information;

A generator torque information acquisition module configured to control engine injection and ignition to obtain generator torque information in response to detecting that the engine speed information satisfies the first preset condition;

The first engine power control module is configured to obtain current vehicle status information in response to detecting that the generator torque information satisfies the second preset condition, determine the target power of the engine according to the current vehicle status information, and determine the target power of the engine according to the target. Power and preset load control duration to control engine power;

The second engine power control module is configured to control the engine power based on the vehicle power demand after the preset load control period.

In a third aspect, embodiments of the present application also provide a hybrid vehicle, which includes: a generator; an engine; and a controller for controlling the generator and the engine.

Wherein, the controller is used to implement the engine starting control method as described in any one of the embodiments of this application.

In a fourth aspect, embodiments of the present application further provide a storage medium containing computer-executable instructions, which when executed by a computer processor are used to perform engine starting as described in any of the embodiments of the present application. Control Method.

Description of the drawings

In order to explain the technical solutions in the embodiments of the present application more clearly, the drawings needed to be used in the description of the embodiments will be briefly introduced below. The drawings in the following description are only some embodiments of the present application. For those in the field, Ordinary technicians can also obtain other drawings based on these drawings without exerting creative work.

Figure 1a is a flow chart of an engine starting control method in Embodiment 1 of the present application.

Figure 1b is a schematic structural diagram of a series mode hybrid configuration involved in Embodiment 1 of the present application.

Figure 1c is a schematic diagram of the change process of engine speed, engine torque, generator torque, and engine power during the engine control process involved in Embodiment 1 of the present application.

Figure 2a is a flow chart of an engine starting control method in Embodiment 2 of the present application.

Figure 2b shows the change process of the engine torque to the target torque involved in Embodiment 2 of the present application. Schematic diagram.

Figure 3 is a schematic structural diagram of an engine start control device in Embodiment 3 of the present application.

Figure 4 is a schematic structural diagram of a hybrid vehicle in Embodiment 4 of the present application.

Detailed ways

In order to enable those in the technical field to better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. The described embodiments are only for the purpose of this application. Apply for some of the embodiments, not all of them. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts should fall within the scope of protection of this application.

It should be noted that the terms "first", "second", etc. in the description and claims of this application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances so that the embodiments of the application described herein can be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "include" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units, which may include a process, method, system, product or equipment that is not expressly listed. or other steps or elements inherent to such processes, methods, products or devices.

Embodiment 1

Figure 1a is a flow chart of an engine starting control method in Embodiment 1 of the present application. This embodiment can be applied to the situation of controlling engine starting during the engine starting process, and can especially be used to control hybrid vehicles with series mode. The scenario of engine start control in power configuration. Figure 1b shows a schematic structural diagram of a series mode hybrid configuration. As shown in Figure 1b, the series mode hybrid configuration may include: a transmission shaft 1, a coupler 2, an engine 3, a generator 4, an electric motor 5, a power battery 6, a differential 7, an inverter 8 and a clutch 9. The connection method of each component can be seen in Figure 1b. The method may be performed by an engine start control device, which may be implemented in the form of hardware and/or software, and which may be integrated into a controller in the hybrid vehicle.

As shown in Figure 1a, the method includes the following steps:

S110. The generator based on the hybrid vehicle drives the engine to rotate and obtains engine speed information.

Among them, hybrid vehicles may refer to vehicles powered by both an engine and a generator. A generator can refer to a machine that provides electrical energy to the whole body. An engine can refer to the machine that provides power for a car to move. The engine speed information may refer to data of engine rotation speed.

In one embodiment, when the vehicle control unit determines that the engine needs to be started based on engine start-stop conditions, the generator sends positive torque to drive the engine to rotate. For example, Figure 1c shows the application Embodiment 1 provides a schematic diagram of the change process of the engine speed, engine torque, generator torque, and engine power during the engine control process. The drag process in S110 can be seen in the drag stage in Figure 1c. When the generator drives the engine to rotate, the controller in the vehicle can obtain engine speed information in real time.

S120. In response to detecting that the engine speed information satisfies the first preset condition, control the engine fuel injection ignition and obtain the generator torque information.

The first preset condition may be a condition set based on business requirements to indicate that the engine state is stable and needs to be satisfied.

For example, the "first preset condition" in S120 may mean that the engine speed is greater than the first speed threshold, and the engine speed fluctuation is less than the second speed threshold for a duration longer than the first duration threshold. The first speed threshold may refer to the minimum speed value at which the engine can stably combust at an air-fuel ratio of 1 and maintain the torque of the generator less than the first torque threshold after overcoming the resistance of itself and the power generation system. Air-fuel ratio can refer to the mass ratio of air to fuel. The first torque threshold may refer to a value that can accurately reflect the maximum torque when the generator is already in a power generation state. The second rotational speed threshold may refer to the value of the maximum fluctuation amount of the engine rotational speed when the change in the engine air intake amount is within the set threshold range when the throttle opening is maintained within a predetermined range. The first duration threshold may refer to the value of the time window for testing changes in engine exhaust volume, and requires that each cylinder is air-intaken at least three times within the time window. For example, the first duration threshold can refer to the t1 duration of the dragging phase in Figure 1c.

It should be noted that by setting the above-mentioned first preset condition, the stability of the engine air intake can be ensured, providing a basis for accurate fuel injection when the engine is started, and abandoning the traditional fuel injection method with an air-fuel ratio less than 1 during the start-up process. The process of achieving an increase in engine speed enables the engine to directly inject and ignite with an air-fuel ratio of 1 in the first injection link, so that the engine can inject and ignite with an air-fuel ratio of 1 in all injection links. This in turn reduces emissions produced during engine starting.

In one embodiment, the controller may detect whether the first preset condition is met based on the acquired engine speed information, and indicate that the engine speed is stable when the first preset condition is met. At this time, the engine can be controlled to perform fuel injection and ignition based on the preset air-fuel ratio, and the generator torque information can be obtained in real time after fuel injection and ignition.

For example, "controlling engine fuel injection and ignition" in S120 may include: obtaining the engine air intake volume at each ignition; determining the target fuel injection volume at each ignition based on the engine air intake volume and the preset air-fuel ratio; Based on the target fuel injection amount, the engine is injected and ignited.

The preset air-fuel ratio may refer to an air-fuel ratio set in advance based on business requirements. For example, the preset air-fuel ratio can be set to 1. For example, for each fuel injection ignition of the engine, the engine air intake volume at the time of ignition can be obtained, and the target fuel injection volume corresponding to the engine air intake volume can be determined based on the preset air-fuel ratio, and based on the current ignition According to the target fuel injection volume at that time, the engine can be ignited by the current injection, so that the engine can In order to perform fuel injection and ignition according to the preset air-fuel ratio every time the fuel is injected and ignited, thereby reducing emissions generated during the engine starting process.

S130. In response to detecting that the generator torque information satisfies the second preset condition, obtain the current vehicle status information, determine the target power of the engine based on the current vehicle status information, and control the engine power based on the target power and the preset load control duration. .

The second preset condition may be a condition set based on business requirements to indicate that the generator is in a stable power generation state and the engine is in a stable combustion state. The current vehicle status information may include the current accelerator pedal opening and the current remaining power. The current remaining power may refer to the current remaining power of the high-voltage battery used for vehicle driving. The preset load control duration may refer to a preset duration for controlling the engine load. For example, the preset load control duration can refer to the t4 duration in the load control phase in Figure 1c. The preset load control duration can be obtained by testing on the complete vehicle rotating hub test. The target power of the engine may refer to the maximum power achieved within a preset load control period. For example, the target power of the engine can refer to the power reached by the engine at time t3 in the load control phase in Figure 1c. And the power remains unchanged during the remaining duration of the load control phase.

In one embodiment, whether the obtained generator torque information satisfies the second preset condition can be detected in real time, and when it is detected that the second preset condition is met, the target power of the engine can be determined based on the current vehicle status information. And within the preset load control period, the engine power can be controlled within the target power, so that the engine power can be controlled within a reasonable range within the preset load control period to avoid an increase in emissions caused by excessive engine power. problem, thereby effectively optimizing the emission performance during the starting process and solving the emission problem caused by multiple starts of hybrid vehicles.

For example, the "second preset condition" in S130 may mean that the generator torque is less than the first torque threshold, and the generator torque fluctuation is less than the second torque threshold for a duration longer than the second duration threshold. The second torque threshold may refer to the fluctuation amount of the motor torque when the engine output torque is stable. For example, the second duration threshold can refer to the t2 duration of the autonomous combustion phase in Figure 1c.

Through the transient results of the original emissions of various vehicle emissions, the preset load control duration covers the area where emissions increase significantly during the start-up process. The engine power is controlled within the target power within the preset load control duration, thereby realizing the transition of load control and optimizing the vehicle's emission performance. By setting the second preset condition, it is ensured that the generator is in a stable power generation state, thereby ensuring that the engine has stable combustion and can output power externally, providing a basis for subsequent engine power increases.

S140. After the load control duration is preset, the engine power is controlled based on the vehicle power demand.

Among them, the power required by the vehicle may refer to the power required for normal driving. In one embodiment, after the preset load control duration, that is, during the start-up completion stage after the load control stage in Figure 1c, the engine speed and engine torque are increased, and the engine power is increased to the vehicle required power. .

For example, "Control the engine power based on the vehicle power demand" in S140 may include: increasing the engine speed and engine torque based on a preset change rate until the engine power increases to the vehicle power demand.

Among them, the preset change rate may refer to a change rate preset to achieve a certain effect within a certain period of time. For example, the preset change rate may refer to the preset change rate of the startup completion phase in Figure 1c. Optionally, after the load control phase ends, based on the preset change rate, the engine speed and engine torque are increased, driving the engine power to change until the engine power increases to the power required by the entire vehicle. Therefore, after load control is achieved, the engine power is immediately increased to the vehicle required power at a set rate, thereby improving the emission problem during the engine starting process, solving the emission deterioration problem caused by multiple starts of hybrid vehicles, and improving the vehicle product emission performance.

In this embodiment, when the generator of the hybrid vehicle drives the engine to rotate, the engine speed information is obtained; when the engine speed information meets the first preset condition, the engine is injected and ignited to obtain the engine torque information; the engine torque information meets the second preset condition. When presetting conditions, obtain the current vehicle status information; determine the target power of the engine based on the current vehicle status information, and control the engine power based on the target power and the preset load control duration; after the preset load control duration, based on the entire vehicle Demand power controls engine power. The engine power is controlled within the target power within the preset load control period, thereby realizing the transition of load control, optimizing the vehicle's emission performance, improving the emission problem during engine starting, and solving the problems caused by multiple starts of hybrid vehicles. solve the emission deterioration problem and improve the emission performance of vehicle products.

Based on the above embodiments, "determining the engine target power based on the current vehicle status information" in S130 may include: determining the engine target power based on the preconfigured information association table, the current accelerator pedal opening, and the current remaining power.

The information association table may include: the power used at each accelerator pedal opening and each remaining power. The accelerator pedal opening in the information association table is different from the current remaining power, and the target power of the engine is also different. For example, Table 1 gives an example of an information association table.

Table 1 Information association table

In one embodiment, after the generator torque meets the second preset condition, the information association table can be searched. Query the power that matches the two-dimensional information of accelerator pedal opening and current remaining power. The matching power obtained from the query can be used as the target power of the engine in the load control phase. By controlling the actual engine power to approach the engine target power within the preset load control period, the actual engine power is finally controlled to reach the engine target power within the preset load control period. In this way, the actual engine power can be controlled to reach the engine target power within the preset load control period, thereby reducing the problem of increased emissions caused by excessive engine power.

Embodiment 2

Figure 2a is a flow chart of an engine start control method in Embodiment 2 of the present application. Based on the above embodiments, this embodiment includes the step "control the engine power according to the target power and the preset load control duration. "Refined. The explanations of terms that are the same as or corresponding to the above-mentioned disclosed embodiments will not be repeated here.

As shown in Figure 2a, the method includes the following steps:

S210. The generator based on the hybrid vehicle drives the engine to rotate and obtains the engine speed information.

S220. In response to detecting that the engine speed information satisfies the first preset condition, control the engine fuel injection ignition and obtain the generator torque information.

S230. In response to detecting that the generator torque information satisfies the second preset condition, obtain current vehicle status information, and determine the target power of the engine based on the current vehicle status information.

S240. Within the preset load control duration, control the engine power to increase to the target power. In response to the time taken to increase the target power being less than the preset load control duration, control the engine to continue the target power within the remaining duration of the preset load control duration.

In one embodiment, the engine power can be controlled to change to the target power at a constant speed within a preset load control period, so that the target power can be continuously and stably increased. In response to the time taken for the engine power increase to be less than the preset load control time period, the engine power is controlled to remain at the target power during the remaining time period. This avoids the engine power exceeding the target power within the preset load control period, and further avoids the increase in emissions caused by excessive engine power during the transition stage of load control.

For example, "controlling the engine power to increase to the target power" in S240 may include: obtaining the target speed and target torque corresponding to the target power; after controlling the engine speed to increase to the target speed, controlling the engine torque to increase to the target torque.

In one embodiment, after the engine speed is increased to the target speed through generator speed regulation, the engine torque is changed to the target torque by increasing the fuel injection amount, thereby achieving a constant speed change in engine power. For example, FIG. 2b is a schematic diagram of the change process of the engine torque to the target torque involved in Embodiment 2 of the present application. Referring to Figure 2b, during the process of the engine power changing to the target power, the engine operating conditions will change. The engine power in the autonomous combustion stage in Figure 1c is the starting point of the change. While keeping the engine output torque constant, first increase the engine speed to reach the target speed. While keeping the engine speed constant, increase the engine output torque to reach the target torque. Therefore, under the same power, the engine load is small, and the emission deterioration problem caused by the change of air-fuel ratio and combustion state due to the synchronous adjustment of speed and torque is avoided, and the engine emission problem is reduced.

After the engine speed is increased to the target speed through generator speed regulation, the engine torque is changed to the target torque by increasing the fuel injection amount, thereby achieving a constant speed change in engine power. This avoids the engine power exceeding the target power within the preset load control period, and further avoids the increase in emissions caused by excessive engine power during the transition stage of load control. It also avoids emission deterioration problems caused by changes in air-fuel ratio and combustion state when speed and torque are adjusted synchronously, and reduces engine emission problems.

S250. After presetting the load control duration, the engine power is controlled based on the vehicle power demand.

In this embodiment, by controlling the engine power to increase to the target power within the preset load control duration, in response to the time taken to increase the target power being less than the preset load control duration, the engine is controlled to maintain the target within the remaining duration of the preset load control duration. power, so as to avoid the engine power exceeding the target power within the preset load control period, and thus avoid the increase in emissions caused by excessive engine power during the transition stage of load control.

The following is an example of an engine start control device provided by the embodiment of the present application. This device and the engine start control method of the above embodiments belong to the same concept. Details that are not described in detail in the embodiments of the engine start control device can be Reference is made to the above embodiments of the engine start control method.

Embodiment 3

Figure 3 is a schematic structural diagram of an engine start control device in Embodiment 3 of the present application. As shown in FIG. 3 , the device may include: an engine speed information acquisition module 310 , a generator torque information acquisition module 320 , a first engine power control module 330 and a second engine power control module 340 .

Among them, the engine speed information acquisition module 310 is configured to drag the engine to rotate based on the generator of the hybrid vehicle to obtain the engine speed information; the generator torque information acquisition module 320 is configured to respond to detecting that the engine speed information satisfies the first predetermined Assume conditions to control engine injection and ignition and obtain generator torque information; the first engine power control module 330 is configured to obtain current vehicle status information in response to detecting that generator torque information satisfies the second preset condition. According to the current vehicle status The information determines the target power of the engine, and controls the engine power according to the target power and the preset load control duration; the second engine power control module 340 is configured to control the engine power based on the vehicle power demand after the preset load control duration. Take control.

In the embodiment of the present application, when the generator of the hybrid vehicle drives the engine to rotate, the engine speed information is obtained. When the engine speed information meets the first preset condition, the engine fuel injection ignition is controlled to obtain Generator torque information. When the generator torque information meets the second preset condition, the current vehicle status information is obtained. The target power of the engine is determined based on the current vehicle status information, and the engine power is controlled based on the target power and the preset load control duration, so that the engine power can be controlled within the target power within the preset load control duration, achieving load control. The transition of control, and after controlling the preset load control duration, the engine power is controlled based on the vehicle power demand. By adding a transition stage of load control, the emission problem during the engine starting process can be improved and many hybrid vehicles can be solved. Improve the emission performance of the entire vehicle product to improve the emission deterioration problem caused by secondary startup.

Optionally, the first preset condition includes: the engine speed is greater than the first speed threshold, and the engine speed fluctuation is less than the second speed threshold for a duration longer than the first duration threshold;

The second preset condition includes: the generator torque is less than the first torque threshold, and the generator torque fluctuation is less than the second torque threshold for a duration longer than the second duration threshold.

Optionally, the generator torque information acquisition module 320 is configured to control engine fuel injection and ignition in the following manner:

The engine air intake volume at each ignition is obtained; based on the engine air intake volume and the preset air-fuel ratio, the target fuel injection volume at each ignition is determined; based on the target fuel injection volume, the engine is injected and ignited.

Optionally, the current vehicle status information includes: current accelerator pedal opening and current remaining power;

The first engine power control module 330 includes:

The target power determination unit is configured to determine the target power of the engine based on a preconfigured information association table, the current accelerator pedal opening and the current remaining power; wherein the information association table is included in each accelerator pedal opening and each remaining power. of power used.

Optionally, the first engine power control module 330 also includes:

The power control unit is configured to control the engine power to increase to the target power within the preset load control duration; in response to the time taken to increase the target power being less than the preset load control duration, control the engine continuously within the remaining duration of the preset load control duration. target power.

Optionally, the power control unit is configured to control the engine power to increase to the target power in the following manner:

Obtain the target speed and target torque corresponding to the target power; after controlling the engine speed to increase to the target speed, control the engine torque to increase to the target torque.

Optionally, the second engine power control module 340 is configured to control the engine power based on the vehicle power demand in the following manner:

Based on the preset change rate, the engine speed and engine torque are increased until the engine power increases to the vehicle power demand.

The engine start control device provided by the embodiments of this application can execute the engine start control method provided by any embodiment of this application, and has corresponding functional modules and beneficial effects for executing the engine start control method.

It is worth noting that in the above embodiment of the engine start control device, the various modules included are only divided according to functional logic. The actual division only needs to be able to realize the corresponding functions; in addition, the names of each functional module are only for convenience. distinguish each other.

Embodiment 4

Figure 4 is a schematic structural diagram of a hybrid vehicle in Embodiment 4 of the present application. The components shown herein, their connections and relationships, and their functions are examples only.

As shown in FIG. 4 , hybrid vehicle 400 may include a generator 410 , an engine 420 and a controller 430 . Among them, the controller 430 is used to implement the engine starting control method as provided in any embodiment of this application.

In the embodiment of the present application, when the generator of the hybrid vehicle drives the engine to rotate, the engine speed information is obtained. When the engine speed information meets the first preset condition, the engine fuel injection and ignition is controlled to obtain the generator torque information. When the generator torque information meets the second preset condition, the current vehicle status information is obtained. The target power of the engine is determined based on the current vehicle status information, and the engine power is controlled based on the target power and the preset load control duration, so that the engine power can be controlled within the target power within the preset load control duration, achieving load control. The transition of control, and after controlling the preset load control duration, the engine power is controlled based on the vehicle power demand. By adding a transition stage of load control, the emission problem during the engine starting process can be improved and many hybrid vehicles can be solved. Improve the emission performance of the entire vehicle product to improve the emission deterioration problem caused by secondary startup.

Embodiment 5

Embodiment 5 of the present application also provides a storage medium containing computer-executable instructions. The computer-executable instructions, when executed by a computer processor, are used to execute an engine start control method. The method includes:

The generator based on the hybrid vehicle drives the engine to rotate and obtains the engine speed information; in response to detecting that the engine speed information meets the first preset condition, the engine fuel injection and ignition is controlled to obtain engine torque information; in response to detecting the engine torque information When the second preset condition is met, the current vehicle status information is obtained, the target power of the engine is determined based on the current vehicle status information, and the engine power is controlled based on the target power and the preset load control duration; after the preset load control duration, based on The engine power is controlled by the power demand of the vehicle.

Of course, the fifth embodiment of the present application provides a storage medium containing computer-executable instructions, and its computer-executable instructions can also execute the engine start control method provided by any embodiment of the present application. Related operations in law.

Through the above description of the implementation, those skilled in the art can clearly understand that the present application can be implemented with the help of software and necessary general hardware. Of course, it can also be implemented with hardware, but in many cases the former is a better implementation. . Based on this understanding, the technical solution of the present application can be embodied in the form of a software product in essence or that contributes to related technologies. The computer software product can be stored in a computer-readable storage medium, such as a computer floppy disk, Read-Only Memory (ROM), Random Access Memory (RAM), FLASH, hard disk or optical disk, etc., including multiple instructions to make a computer device (which can be a personal computer , server, or network device, etc.) to perform the methods described in various embodiments of this application.

Claims

An engine starting control method includes:

The generator based on the hybrid vehicle drives the engine to rotate and obtains engine speed information;

In response to detecting that the engine speed information satisfies the first preset condition, control engine injection ignition and obtain generator torque information;

In response to detecting that the generator torque information satisfies the second preset condition, current vehicle status information is obtained, the target power of the engine is determined based on the current vehicle status information, and the target power is determined based on the target power and the preset load control duration. Engine power is controlled;

After the preset load control period, the engine power is controlled based on the vehicle power demand.
The method according to claim 1, wherein the first preset condition includes: the engine speed is greater than the first speed threshold, and the engine speed fluctuation is less than the second speed threshold for a duration longer than the first duration threshold;

The second preset condition includes: the generator torque is less than the first torque threshold, and the generator torque fluctuation is less than the second torque threshold for a duration longer than the second duration threshold.
The method according to claim 1, wherein said controlling engine fuel injection ignition includes:

Get the engine air intake volume at each ignition;

Based on the engine air intake volume and the preset air-fuel ratio, determine the target fuel injection volume at each ignition;

Based on the target fuel injection amount, fuel injection and ignition is performed on the engine.
The method according to claim 1, wherein the current vehicle status information includes: current accelerator pedal opening and current remaining power;

Determining the target power of the engine based on the current vehicle status information includes:

Determine the target power of the engine based on the preconfigured information association table, the current accelerator pedal opening and the current remaining power;

Wherein, the information association table includes the power used at each accelerator pedal opening and each remaining power.
The method according to claim 1, wherein the controlling the engine power according to the target power and the preset load control duration includes:

Within the preset load control duration, control the engine power to increase to the target power;

In response to the time taken to increase the target power being less than the preset load control duration, the engine is controlled to continue the target power within the remaining duration of the preset load control duration.
The method of claim 5, wherein said controlling engine power is increased to said target Standard power includes:

Obtain the target speed and target torque corresponding to the target power;

After the engine speed is controlled to increase to the target speed, the engine torque is controlled to increase to the target torque.
The method according to any one of claims 1 to 6, wherein the controlling the engine power based on the vehicle power demand includes:

Based on the preset change rate, the engine speed and engine torque are increased until the engine power increases to the vehicle power demand.
An engine starting control device, including:

The engine speed information acquisition module is configured to drive the engine to rotate based on the generator of the hybrid vehicle to obtain engine speed information;

A generator torque information acquisition module configured to control engine injection and ignition to obtain generator torque information in response to detecting that the engine speed information satisfies the first preset condition;

The first engine power control module is configured to obtain current vehicle status information in response to detecting that the generator torque information satisfies the second preset condition, determine the target power of the engine according to the current vehicle status information, and determine the target power of the engine according to the target. Power and preset load control duration to control engine power;

The second engine power control module is configured to control the engine power based on the vehicle power demand after the preset load control period.
A hybrid vehicle, the hybrid vehicle includes: a generator, an engine and a controller;

Wherein, the controller is used to implement the engine starting control method described in any one of claims 1-7.
A computer-readable storage medium stores computer instructions, and the computer instructions are used to implement the engine start control method according to any one of claims 1-7 when executed by a processor.