Post-processing control method and system of P1 parallel hybrid electric vehicle and electronic equipment

Abstract

The invention discloses a post-processing control method and system of a P1 parallel type hybrid electric vehicle and electronic equipment, and relates to the technical field of vehicle post-processing, and the post-processing control method comprises the steps that when the vehicle is in a neutral gear sliding state, the current SCR upstream temperature, the current environment temperature, the current vehicle speed and the current road slope are obtained; determining a predicted temperature drop rate according to the current SCR upstream temperature and the current environment temperature; determining predicted sliding duration according to the current vehicle speed and the current road slope; according to the predicted temperature drop rate and the predicted sliding duration, the temperature value after SCR upstream drop is determined; determining control modes of an engine and a motor according to the SCR upstream reduced temperature value; and controlling the engine and the motor to work according to the control modes of the engine and the motor. And different SCR upstream reduced temperature values can be better adapted, so that the problems of carbon deposition, crystallization, fuel consumption deterioration of the whole vehicle and the like caused by entering a post-treatment heat management mode can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle aftertreatment, and particularly to an aftertreatment control method, system and electronic device for a P1 parallel hybrid vehicle. Background Art

[0002] P1 parallel is a technical route for hybrid vehicles. Its drive assembly consists of an AMT transmission, a motor, a clutch, and an engine. The clutch is located between the transmission and the motor, and the motor is coaxial with the engine.

[0003] When a P1 parallel hybrid vehicle does not perform energy recovery during coasting, it usually selects to shift to neutral and the engine returns to idle speed. During idle speed, the temperature of the engine aftertreatment drops rapidly, resulting in poor performance of the SCR catalyst and high nitrogen oxide emissions. When the vehicle is driving, to increase the aftertreatment temperature, technical measures such as reducing the intake throttle valve opening and reducing the fuel injection advance angle are usually adopted to increase the exhaust temperature. However, this method will cause combustion deterioration, increasing the aftertreatment carbon deposition rate and fuel consumption rate. Summary of the Invention

[0004] The present application provides an aftertreatment control method, system and electronic device for a P1 parallel hybrid vehicle to solve at least one technical problem existing in the related art.

[0005] According to one aspect of the embodiments of the present application, an aftertreatment control method for a P1 parallel hybrid vehicle is provided, including: when the vehicle is in a neutral coasting state: obtaining the current SCR upstream temperature, the current ambient temperature, the current vehicle speed, and the current road slope; determining the predicted temperature drop rate according to the current SCR upstream temperature and the current ambient temperature; determining the predicted coasting duration according to the current vehicle speed and the current road slope; determining the SCR upstream reduced temperature value according to the predicted temperature drop rate and the predicted coasting duration; determining the control modes of the engine and the motor according to the SCR upstream reduced temperature value; and controlling the engine and the motor to operate according to the control modes of the engine and the motor.

[0006] As an optional implementation manner, the determining the control modes of the engine and the motor according to the SCR upstream reduced temperature value includes: if the SCR upstream reduced temperature value is lower than the lowest preset temperature value, controlling the engine and the motor to operate in a first control mode; if the SCR upstream reduced temperature value is higher than the highest preset temperature value, controlling the engine and the motor to operate in a second control mode.

[0007] As an optional implementation manner, it includes: determining the lowest preset temperature value and the highest preset temperature value according to the properties of the aftertreatment catalyst.

[0008] As an alternative embodiment, the first control mode includes: controlling the engine and the motor to operate at a preset operating point; setting the motor to torque control to respond to a set torque, and setting the engine to speed control to respond to a set speed.

[0009] As an alternative embodiment, controlling the engine and the motor to operate at a preset operating point includes: determining an engine driving speed range and a maximum motor generating torque range; determining, within the engine driving speed range and the maximum motor generating torque range, an operating point with the maximum oil-electric conversion coefficient, and setting it as the preset operating point.

[0010] As an alternative embodiment, the second control mode includes: clearing the torque of the motor and controlling the engine to return to the idle state.

[0011] As an alternative embodiment, when the vehicle neutral coasting ends; if the temperature upstream of the SCR exceeds the lowest preset temperature value, control the motor torque to be cleared to respond to the vehicle torque demand; if the temperature upstream of the SCR is still lower than the lowest preset temperature value, then control the motor to operate with negative torque until the SOC reaches a preset percentage of the power generation upper limit and then clear it to respond to the vehicle torque demand.

[0012] According to another aspect of the present application, a post-treatment control system for a P1 parallel hybrid vehicle includes: a working condition acquisition module for acquiring the current temperature upstream of the SCR, the current ambient temperature, the current vehicle speed, and the current road gradient; a temperature drop rate determination module for determining an expected temperature drop rate according to the current temperature upstream of the SCR and the current ambient temperature; a coasting duration determination module for determining an expected coasting duration according to the current vehicle speed and the current road gradient; a temperature value determination module for determining the temperature value after the reduction of the temperature upstream of the SCR according to the expected temperature drop rate and the expected coasting duration; a control mode determination module for determining the control mode of the engine and the motor according to the temperature value after the reduction of the temperature upstream of the SCR; and an enabling module for controlling the engine and the motor to operate according to the control mode of the engine and the motor.

[0013] According to another aspect of the present application, there is provided an electronic device, including a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory complete communication with each other through the communication bus, and are characterized in that the memory is used for storing a computer program; the processor is used for executing the steps of the post-treatment control method of the P1 parallel hybrid vehicle by running the computer program stored on the memory.

[0014] According to another aspect of the present application, there is provided a computer-readable storage medium storing a computer program, wherein the computer program is configured to execute the steps of the post-treatment control method for the P1 parallel hybrid vehicle when running.

[0015] In an embodiment of the present application, there are provided a post-treatment control method, system and electronic device for a P1 parallel hybrid vehicle, including: when the vehicle is in a neutral coasting state: obtaining the current temperature upstream of the SCR, the current ambient temperature, the current vehicle speed and the current road gradient; determining the predicted temperature drop rate according to the current temperature upstream of the SCR and the current ambient temperature; determining the predicted coasting duration according to the current vehicle speed and the current road gradient; determining the temperature value after reduction upstream of the SCR according to the predicted temperature drop rate and the predicted coasting duration; determining the control modes of the engine and the motor according to the temperature value after reduction upstream of the SCR; and controlling the engine and the motor to operate according to the control modes of the engine and the motor. By comprehensively considering the temperature upstream of the SCR, the ambient temperature, the current vehicle speed and the current road gradient, the temperature value after reduction upstream of the SCR is obtained, and then different control modes of the engine and the motor are controlled according to different temperature values after reduction upstream of the SCR, which can better adapt to different temperature values after reduction upstream of the SCR, and thus can achieve the reduction of problems such as carbon deposition, crystallization and deterioration of the vehicle fuel consumption caused by entering the post-treatment thermal management mode. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings herein are incorporated into the specification and form a part of the specification, showing embodiments consistent with the present invention and used together with the specification to explain the principles of the present invention.

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a schematic flowchart of the post-treatment control method for the P1 parallel hybrid vehicle provided by the embodiment of the present application. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the solution of the present application, the following will clearly and completely describe the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0020] It should be noted that the terms "first", "second", etc. in the specification, claims and above-mentioned drawings of the present application are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0021] As Figure 1 shown, according to one aspect of the embodiments of the present application, a post-treatment control method for a P1 parallel hybrid vehicle is provided, including: when the vehicle is in a neutral coasting state:

[0022] S1 Obtain the current SCR upstream temperature, the current ambient temperature, the current vehicle speed, and the current road gradient;

[0023] S2 Determine the predicted temperature drop rate according to the current SCR upstream temperature and the current ambient temperature;

[0024] S3 Determine the predicted coasting duration according to the current vehicle speed and the current road gradient;

[0025] S4 Determine the post-lowering temperature value of the SCR upstream according to the predicted temperature drop rate and the predicted coasting duration;

[0026] S5 Determine the control modes of the engine and the motor according to the post-lowering temperature value of the SCR upstream;

[0027] S6 Control the engine and the motor to operate according to the control modes of the engine and the motor.

[0028] When the vehicle is in a neutral coasting state, by comprehensively considering the SCR upstream temperature, the ambient temperature, the current vehicle speed, and the current road gradient, the post-lowering temperature value of the SCR upstream is obtained. Then, according to different post-lowering temperature values of the SCR upstream, different control modes are used to control the engine and the motor, which can be more adaptable to different post-lowering temperature values of the SCR upstream, and thus can reduce problems such as carbon deposition, crystallization, and deterioration of the vehicle fuel consumption caused by entering the post-treatment thermal management mode.

[0029] Among them, in step S2, the predicted temperature drop rate is determined according to the current temperature upstream of the SCR and the current ambient temperature. A MAP of the temperature drop rate based on the temperature upstream of the SCR and the ambient temperature can be preset. The temperature drop rate is positively correlated with the temperature upstream of the SCR and negatively correlated with the ambient temperature. In step S3, the predicted coasting duration is determined according to the current vehicle speed and the current road slope. A MAP of the coasting time based on the driving speed and the slope can be preset. The coasting time is positively correlated with the vehicle speed and the slope. However, when the vehicle speed and the slope are too large, the coasting time should be shortened because excessive vehicle speed and slope will trigger the vehicle to coast in gear.

[0030] Step S4: Determine the temperature value after reduction upstream of the SCR according to the predicted temperature drop rate and the predicted coasting duration. It can be obtained by multiplying the temperature drop rate by the coasting time to get the predicted temperature that the upstream of the SCR is expected to drop to. That is, by reading the current temperature upstream of the SCR and the ambient temperature, obtaining the temperature drop rate based on the preset MAP, with the unit of °C / min, by reading the current vehicle speed and slope, obtaining the coasting duration based on the preset MAP, with the unit of s, and multiplying the temperature drop rate by the coasting time to obtain the predicted temperature that the upstream of the SCR is expected to drop to.

[0031] As an optional implementation manner, the determining the control modes of the engine and the motor according to the temperature value after reduction upstream of the SCR includes: if the temperature value after reduction upstream of the SCR is lower than the lowest preset temperature value, controlling the engine and the motor to operate in the first control mode; if the temperature value after reduction upstream of the SCR is higher than the highest preset temperature value, controlling the engine and the motor to operate in the second control mode.

[0032] Specifically, grading and controlling the working conditions of the engine and the motor according to the predicted temperature value after reduction upstream of the SCR determined by the temperature upstream of the SCR, the ambient temperature, the current vehicle speed, and the current road slope can further reduce problems such as carbon deposition, crystallization, and deterioration of vehicle fuel consumption that may be caused when entering the after-treatment thermal management mode when the temperature upstream of the SCR is too high or too low.

[0033] In addition, it should be understood that when the temperature value after reduction upstream of the SCR is between the lowest preset temperature value and the highest preset temperature value, the performance of the catalyst is better, and at this time, the after-treatment process is normally entered.

[0034] As an optional implementation manner, it includes: determining the lowest preset temperature value and the highest preset temperature value according to the properties of the after-treatment catalyst.

[0035] Specifically, by determining the lowest preset temperature value and the highest preset temperature value through the properties of the post-treatment catalyst, it is possible to better adapt to different vehicles and improve the applicable range of the control method of the present application. For example, if a copper-based catalyst is used, when the temperature drops to about 200°C, the efficiency of converting nitrogen oxides is relatively low, and there will be risks of post-treatment crystallization and ammonia leakage. When the temperature is around 300°C, the performance of the copper-based catalyst is better. Therefore, the upper and lower limits of the temperature threshold can be set within the range of 200-300°C. The SCR temperature threshold can be set as (220, 280). When the SCR upstream temperature is expected to drop below 220°C, the engine and the motor are controlled to operate in the first control mode. When the SCR upstream temperature exceeds 280°C during coasting, the SCR temperature threshold is set as (220, 280). When the SCR upstream temperature is expected to drop below 220°C, the engine and the motor are controlled to operate in the second control mode.

[0036] As an alternative implementation, the first control mode includes: controlling the engine and the motor to work at a preset operating point; setting the motor to torque control to respond to the set torque, and setting the engine to speed control to respond to the set speed.

[0037] Specifically, controlling the engine and the motor to work at a preset operating point; setting the motor to torque control to respond to the set torque, and setting the engine to speed control to respond to the set speed can increase the SCR upstream temperature. It can effectively improve the post-treatment temperature and reduce problems such as carbon deposition, crystallization, and deterioration of vehicle fuel consumption caused by entering the post-treatment thermal management mode.

[0038] As an alternative implementation, controlling the engine and the motor to work at a preset operating point includes: determining the engine driving speed range and the maximum motor generating torque range; determining the operating point with the maximum oil-electric conversion coefficient within the engine driving speed range and the maximum motor generating torque range, and setting it as the preset operating point.

[0039] Specifically, by way of example: based on the current vehicle speed and the corresponding driving gear, the speeds of the motor and the engine during current driving can be calculated; setting the upper limit of the state of charge (SOC) for power generation as 80%, subtracting the current SOC, multiplying by the rated capacity of the power battery to obtain the maximum power generation, with the unit of kWh. Based on the coasting duration, the maximum power of the motor for power generation can be obtained, with the unit of kW. The maximum torque of the motor for power generation is calculated by subtracting 400 revolutions from the engine speed when not in the coasting state; within the speed range of (driving speed - 400, driving speed) and the maximum motor generating torque range, select the operating point with the maximum oil-electric conversion coefficient as the working point.

[0040] As an alternative implementation, the second control mode includes: clearing the torque of the motor and controlling the engine to return to the idle state.

[0041] As an alternative implementation, when the vehicle's neutral coasting ends, if the temperature upstream of the SCR exceeds the minimum preset temperature value, control the motor torque to zero and respond to the vehicle's overall torque demand; if the temperature upstream of the SCR is still lower than the minimum preset temperature value, then control the motor to operate with negative torque until the SOC reaches a preset ratio of the power generation upper limit and then clear it, and respond to the vehicle's overall torque demand.

[0042] Taking into account the temperature upstream of the SCR and the ambient temperature, based on the SOC limit, select the operating point with the best efficiency. Compared with the traditional neutral coasting strategy, it can effectively increase the aftertreatment temperature, reduce problems such as carbon deposition, crystallization, and deterioration of the vehicle's overall fuel consumption caused by entering the aftertreatment thermal management mode. At the same time, shifting gears from the set engine speed point can improve the gear shifting response time, which is beneficial to improving the driving experience.

[0043] According to another aspect of the present application, a post-treatment control system for a P1 parallel hybrid vehicle includes: a working condition acquisition module for acquiring the current temperature upstream of the SCR, the current ambient temperature, the current vehicle speed, and the current road gradient; a temperature drop rate determination module for determining the predicted temperature drop rate according to the current temperature upstream of the SCR and the current ambient temperature; a coasting duration determination module for determining the predicted coasting duration according to the current vehicle speed and the current road gradient; a temperature value determination module for determining the temperature value after the reduction of the temperature upstream of the SCR according to the predicted temperature drop rate and the predicted coasting duration; a control mode determination module for determining the control modes of the engine and the motor according to the temperature value after the reduction of the temperature upstream of the SCR; and an enabling module for controlling the engine and the motor to operate according to the control modes of the engine and the motor.

[0044] According to another aspect of the present application, there is provided an electronic device, including a processor, a communication interface, a memory, and a communication bus. Among them, the processor, the communication interface, and the memory complete communication with each other through the communication bus. The characteristic is that the memory is used to store a computer program; the processor is used to execute the steps of the post-treatment control method of the P1 parallel hybrid vehicle by running the computer program stored on the memory.

[0045] According to yet another aspect of the present application, there is provided a computer-readable storage medium, in which a computer program is stored. Among them, the computer program is set to execute the steps of the post-treatment control method of the P1 parallel hybrid vehicle when running.

[0046] Those of ordinary skill in the art can understand that the device for implementing the above post-treatment control method of the P1 parallel hybrid vehicle can be a terminal device, which can be a smart phone (such as an Android phone, an IOS phone, etc.), a tablet computer, a palm computer, and a mobile Internet device (MID), a PAD, and other terminal devices. The present application does not limit the structure of the above electronic device.

[0047] Those of ordinary skill in the art can understand that all or part of the steps in the various methods of the above embodiments can be completed by a program instructing the relevant hardware of the terminal device. The program can be stored in a computer-readable storage medium, and the storage medium can include: a flash drive, a ROM, a RAM, a magnetic disk, or an optical disc, etc.

[0048] The serial numbers of the above embodiments of the present application are only for description and do not represent the advantages or disadvantages of the embodiments.

[0049] If the integrated unit in the above embodiments is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in the above computer-readable storage medium. Based on such an understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in the storage medium and includes several instructions for causing one or more electronic devices (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application.

[0050] In the above embodiments of the present application, the descriptions of the various embodiments each have their own focuses. For the parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0051] In the several embodiments provided by the present application, it should be understood that the disclosed client can be implemented in other ways. Among them, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there can be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed mutual coupling or direct coupling or communication connection can be through some interfaces, and the indirect coupling or communication connection of the units or modules can be in an electrical or other form.

[0052] The unit described as a separation component may or may not be physically separated. The component displayed as a unit may or may not be a physical unit, that is, it may be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution provided in this embodiment.

[0053] In addition, in each embodiment of the present application, each functional unit may be integrated in a processing unit, or each unit may exist physically alone, or two or more units may be integrated in one unit. The above integrated unit may be implemented in the form of hardware or in the form of a software functional unit.

[0054] In the above embodiments of the present application, the descriptions of the respective embodiments have their own emphases. For the parts not detailed in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0055] The above is only the preferred embodiment of the present application. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present application, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present application.

Claims

1. A post-treatment control method for a P1 parallel hybrid vehicle, characterized in that Including: When the vehicle is in neutral coasting state: Obtain the current upstream temperature of SCR, the current ambient temperature, the current vehicle speed, and the current road gradient; Determine the predicted temperature drop rate according to the current upstream temperature of SCR and the current ambient temperature; Determine the predicted coasting duration according to the current vehicle speed and the current road gradient; Determine the reduced temperature value upstream of SCR according to the predicted temperature drop rate and the predicted coasting duration; Determine the control modes of the engine and the motor according to the reduced temperature value upstream of SCR; Control the operation of the engine and the motor according to the control modes of the engine and the motor.

2. The post-treatment control method of the P1 parallel hybrid vehicle according to claim 1, wherein The determining the control modes of the engine and the motor according to the reduced temperature value upstream of SCR includes: If the reduced temperature value upstream of SCR is lower than the lowest preset temperature value, control the engine and the motor to operate in the first control mode; If the reduced temperature value upstream of SCR is higher than the highest preset temperature value, control the engine and the motor to operate in the second control mode.

3. The post-treatment control method for the P1 parallel hybrid vehicle according to claim 2, characterized in that, Including: Determine the lowest preset temperature value and the highest preset temperature value according to the properties of the after-treatment catalyst.

4. The post-treatment control method of the P1 parallel hybrid vehicle according to claim 2, characterized in that, The first control mode includes: Control the engine and the motor to work at a preset operating point; The motor is set to torque control, responding to the set torque, and the engine is set to speed control, responding to the set speed.

5. The post-treatment control method for the P1 parallel hybrid vehicle according to claim 4, characterized in that, The controlling the engine and the motor to work at a preset operating point includes: Determine the engine driving speed range and the maximum motor generating torque range; Determine the operating point with the maximum oil-electric conversion coefficient within the engine driving speed range and the maximum motor generating torque range, and set it as the preset operating point.

6. The post-treatment control method of the P1 parallel hybrid vehicle according to claim 2, wherein The second control mode includes: clear the torque of the motor and control the engine to return to the idle state.

7. The post-treatment control method for the P1 parallel hybrid vehicle according to claim 2, wherein, When the vehicle neutral coasting ends; If the upstream temperature of SCR exceeds the lowest preset temperature value, control the motor torque to be cleared and respond to the vehicle torque demand; If the upstream temperature of SCR is still lower than the lowest preset temperature value, then control the motor to work with negative torque until the SOC reaches a preset ratio of the power generation upper limit and then clear it, and respond to the vehicle torque demand.

8. A post-treatment control system for a P1 parallel hybrid vehicle, characterized in that, Including: A working condition acquisition module, configured to obtain the current upstream temperature of SCR, the current ambient temperature, the current vehicle speed, and the current road gradient; A temperature drop rate determination module, configured to determine the predicted temperature drop rate according to the current upstream temperature of SCR and the current ambient temperature; A coasting duration determination module, configured to determine the predicted coasting duration according to the current vehicle speed and the current road gradient; A temperature value determination module, configured to determine the reduced temperature value upstream of SCR according to the predicted temperature drop rate and the predicted coasting duration; A control mode determination module, configured to determine the control modes of the engine and the motor according to the reduced temperature value upstream of SCR; An enabling module, configured to control the operation of the engine and the motor according to the control modes of the engine and the motor.

9. An electronic device, comprising a processor, a communication interface, a memory, and a communication bus, wherein, The processor, the communication interface, and the memory complete the communication with each other through the communication bus. It is characterized in that The memory is used to store computer programs; The processor is configured to execute the steps of the post-processing control method of the P1 parallel hybrid vehicle according to any one of claims 1 to 7 by running the computer program stored on the memory.

10. A computer-readable storage medium, characterized in that, The storage medium stores a computer program, wherein the computer program is configured to execute the steps of the post-processing control method of the P1 parallel hybrid vehicle according to any one of claims 1 to 7 when running.

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