Engine output torque control method and system
By obtaining the opening value and engine water temperature of the throttle pedal, judging the temperature of the catalyst and output appropriate torque, solving the problem of intense engine torque fluctuations when the vehicle's cold vehicle starts, and realizes the effect of reducing pollutant emissions.
Patent Information
- Application Number
- CN202411338122.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-25
- Publication Date
- 2025-01-28
AI Technical Summary
When the vehicle starts cold, the driver's driving behavior is difficult to control, which can easily lead to severe engine torque fluctuations, resulting in poor combustion and a sharp increase in pollutants.
By obtaining the opening value and engine water temperature of the throttle pedal, determine whether the temperature of the catalyst reaches the fire temperature. If it is not reached, obtain the maximum torque limit and the requirements of the demand torque according to the preset relationship, and combine the filter factor output torque until the catalyst temperature Reach demand temperature.
Effectively control the torque increase rate of the engine during the heating of the catalyst, avoid fierce torque fluctuations, reduce pollutant emissions and protect the environment.
Smart Images
Figure CN119373612A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of engine torque control, and in particular to an engine output torque control method and system. Background Art
[0002] In order to meet the engine output torque control requirements, the vehicle engine is usually equipped with a catalyst, which converts harmful gases such as carbon monoxide, hydrocarbons and nitrogen oxides generated during the operation of the engine into harmless carbon dioxide, water and nitrogen through oxidation and reduction, so as to effectively reduce the emission of harmful gases and reduce the pollution of the environment by vehicle exhaust.
[0003] The pollutants from the engine output torque are minimal only when the engine is hot and the catalyst is at high temperature, and 50% of the vehicle's total pollutant emissions are usually generated when the vehicle is cold. Therefore, when the vehicle is started with a cold engine, in theory, the driver only needs to slowly step on the accelerator until the catalyst reaches the ignition temperature. The whole process generally takes 10 seconds, which can reduce the vehicle's pollutant emissions.
[0004] However, in actual road driving, the driving behavior of the vehicle driver is difficult to control. When the vehicle is cold-started and the catalyst has not yet reached the ignition temperature, it is easy for the vehicle driver to step on the accelerator too vigorously, causing the engine torque to fluctuate violently. When the engine fluctuates violently and frequently, the amount of air required for combustion cannot keep up with the set target due to inertia, causing combustion to deteriorate, which in turn leads to a sharp increase in vehicle pollutants, which is not conducive to environmental protection. Therefore, it is urgent to develop an engine output torque control method to control the output of the engine torque after the vehicle is cold-started, so as to avoid the increase of pollutants caused by the violent fluctuation of the engine torque. Summary of the invention
[0005] Based on this, the purpose of the present invention is to provide an engine output torque control method and system, aiming to solve the technical problems in the prior art that during actual road driving, the driving behavior of the vehicle driver is uncontrollable, and when the vehicle is cold started and the catalyst has not reached the ignition temperature, it is easy for the vehicle driver to step on the accelerator too aggressively, causing violent fluctuations in the engine torque and a sharp increase in vehicle pollutants, which is not conducive to environmental protection.
[0006] One aspect of the present invention is to provide an engine output torque control method, comprising:
[0007] Get the accelerator pedal opening value and the current engine water temperature;
[0008] Determine whether the current water temperature is greater than the water temperature threshold;
[0009] If it is greater than the water temperature threshold, the current temperature of the catalyst is obtained;
[0010] Determine whether the current temperature of the catalyst is greater than a catalyst temperature threshold;
[0011] If it is not greater than the catalyst temperature threshold, the maximum torque limit corresponding to the current catalyst temperature is obtained according to the first preset relationship; the required torque is obtained according to the accelerator pedal opening value, and the catalyst required temperature corresponding to the required torque is obtained according to the second preset relationship;
[0012] determining whether the maximum torque limit is less than the required torque;
[0013] If it is less than the required torque, the catalyst is heated to make the catalyst temperature reach the required catalyst temperature, and the torque is output in combination with the filter factor until the actual output torque reaches the required torque. The filter factor is the relationship between the accelerator pedal opening change value and the catalyst temperature.
[0014] Compared with the prior art, the beneficial effect of the engine output torque control method of the present invention is that by obtaining the maximum torque limit, the required torque and combining the filter factor output torque, the rate of increase of the engine output torque during the catalyst heating process can be controlled. In this way, when the vehicle driver steps on the accelerator too vigorously, the engine torque can be effectively avoided from fluctuating violently after the vehicle is started from a cold engine, thereby achieving the purpose of reducing vehicle pollutant emissions and being beneficial to environmental protection.
[0015] In addition, the engine output torque control method according to the present invention may also have the following additional technical features:
[0016] Furthermore, after the step of determining whether the current temperature of the catalyst is greater than the catalyst temperature threshold, the step further includes:
[0017] If the current temperature of the catalyst is greater than the catalyst temperature threshold, the required torque is obtained according to the accelerator pedal opening value, and the required torque is output.
[0018] Further, in the step of heating the catalyst so that the catalyst temperature reaches the catalyst required temperature, and outputting the torque in combination with the filter factor until the actual output torque reaches the required torque:
[0019] The filter factor when the accelerator pedal opening change value is greater than 80% is smaller than the filter factor when the accelerator pedal opening change value is less than 80%.
[0020] Further, in the step of heating the catalyst so that the catalyst temperature reaches the catalyst required temperature:
[0021] The time for heating the catalyst shall not exceed 30 seconds.
[0022] Furthermore, after the step of determining whether the current water temperature is greater than the water temperature threshold, the following steps are further performed:
[0023] When the current water temperature is not greater than the water temperature threshold, the engine torque is not limited.
[0024] Further, the first preset relationship is the relationship between the catalyst temperature and the maximum torque limit, wherein:
[0025] When the catalyst temperature is -10°C, the maximum torque limit is 60%;
[0026] When the catalyst temperature is 0°C, the maximum torque limit is 70%;
[0027] When the catalyst temperature is 250°C, the maximum torque limit is 80%;
[0028] When the catalyst temperature is 350°C, the maximum torque limit is 100%;
[0029] When the catalyst temperature is 500°C, the maximum torque limit is 100%.
[0030] Furthermore, the second preset relationship is the relationship between the accelerator pedal opening value, the catalyst temperature and the filter factor, wherein:
[0031] The larger the accelerator pedal opening value, the smaller the filter factor, and the greater the rising slope of the output torque;
[0032] The higher the catalyst temperature, the smaller the filter factor and the greater the rising slope of the output torque.
[0033] Another aspect of the present invention is to provide an engine output torque control system, comprising:
[0034] The acquisition module is used to obtain the accelerator pedal opening value and the current water temperature of the engine;
[0035] The first judgment module is used to judge whether the current water temperature is greater than the water temperature threshold;
[0036] A first execution module, used for obtaining the current temperature of the catalyst when the current water temperature is greater than the water temperature threshold;
[0037] A second judgment module is used to judge whether the current temperature of the catalyst is greater than the catalyst temperature threshold;
[0038] The second execution module is used for obtaining the maximum torque limit value corresponding to the current catalyst temperature according to the first preset relationship when the current catalyst temperature is not greater than the catalyst temperature threshold; obtaining the required torque according to the accelerator pedal opening value, and obtaining the catalyst required temperature corresponding to the required torque according to the second preset relationship;
[0039] A third judgment module, used for judging whether the maximum torque limit is less than the required torque;
[0040] The third execution module is used to heat the catalyst to make the catalyst temperature reach the catalyst required temperature when the maximum torque limit is less than the required torque, and output the torque in combination with the filter factor until the actual output torque reaches the required torque, and the filter factor is the relationship between the accelerator pedal opening change value and the catalyst temperature.
[0041] The present invention also provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the engine output torque control method provided above is implemented.
[0042] The present invention also provides a data processing device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the engine output torque control method as provided in the preceding claim when executing the program. BRIEF DESCRIPTION OF THE DRAWINGS
[0043] Figure 1 is a flow chart of an engine output torque control method of the present invention;
[0044] Figure 2 A block diagram of an engine output torque control system of the present invention;
[0045] Figure 3 A block diagram of a data processing device according to the present invention.
[0046] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION
[0047] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.
[0048] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.
[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.
[0050] In order to solve the technical problem that the driving behavior of the vehicle driver is not controllable during the actual road driving process in the prior art, when the vehicle is cold started and the catalyst has not reached the ignition temperature, it is easy for the vehicle driver to step on the accelerator too vigorously, causing the engine torque to fluctuate violently. When the engine fluctuates violently and frequently, the amount of air required for combustion cannot keep up with the set target due to inertia, causing combustion to deteriorate, and then causing a sharp increase in vehicle pollutants, which is not conducive to environmental protection. The engine output torque control method and system provided in the present application achieves the control of the rate of increase of the engine output torque during the catalyst heating process by obtaining the maximum torque limit, the required torque and combining the filter factor output torque. In this way, when the vehicle driver steps on the accelerator too vigorously, it can effectively avoid the violent fluctuation of the engine torque after the vehicle is cold started, thereby achieving the purpose of reducing vehicle pollutant emissions and being beneficial to environmental protection.
[0051] To facilitate understanding of the present invention, the specific implementation of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.
[0052] See also Figure 1 , which is a flow chart of the engine output torque control method of the present invention, the engine output torque control method of the present invention comprises the following steps S101 to S109:
[0053] S101. Obtain the accelerator pedal opening value and the current engine water temperature.
[0054] The displacement information of the vehicle driver when stepping on the accelerator pedal is collected by the displacement sensor arranged on the accelerator pedal, and the accelerator pedal opening value input by the vehicle driver through the accelerator pedal is obtained based on the displacement information; the current water temperature of the engine is collected by the temperature sensor arranged on the engine.
[0055] S102: Determine whether the current water temperature is greater than a water temperature threshold.
[0056] S103: If the current water temperature of the engine is greater than the water temperature threshold, the current temperature of the catalyst is obtained.
[0057] Specifically, in this embodiment, the water temperature threshold of the engine is -10°C. When the current water temperature of the engine is greater than -10°C, the current temperature of the catalyst is collected by a temperature sensor provided on the catalyst, and step S105 is executed.
[0058] S104: If the current water temperature of the engine is lower than the water temperature threshold, the engine torque is not limited.
[0059] Specifically, in this embodiment, the engine water temperature threshold is -10°C. According to emission regulations, when the engine water temperature is lower than -10°C, there is no requirement to monitor vehicle pollutant emissions. At the same time, in order to maintain the driver's urgent need for engine power in specific scenarios, when the engine water temperature is below -10°C, there is no restriction on the engine torque.
[0060] S105: Determine whether the current temperature of the catalyst is greater than a catalyst temperature threshold.
[0061] S106. If the current temperature of the catalyst is not greater than the catalyst temperature threshold, the maximum torque limit corresponding to the current temperature of the catalyst is obtained according to the first preset relationship; the required torque is obtained according to the accelerator pedal opening value, and the catalyst required temperature corresponding to the required torque is obtained according to the second preset relationship, and step S108 is executed.
[0062] Specifically, in this embodiment, the catalyst temperature threshold is set to 350°C. When the current catalyst temperature is not greater than 350°C, the maximum torque limit corresponding to the current catalyst temperature is obtained according to the first preset relationship, wherein the first preset relationship is the relationship between the catalyst temperature and the maximum torque limit. Specifically, in this embodiment:
[0063] When the catalyst temperature is -10°C, the maximum torque limit is 60%;
[0064] When the catalyst temperature is 0°C, the maximum torque limit is 70%;
[0065] When the catalyst temperature is 250°C, the maximum torque limit is 80%;
[0066] When the catalyst temperature is 350°C, the maximum torque limit is 100%;
[0067] When the catalyst temperature is 500°C, the maximum torque limit is 100%.
[0068] That is, as shown in Table 1 below, the maximum torque limit of the engine is set. The maximum torque limit in this embodiment is represented by the ratio of the maximum torque at each speed of the engine, and the maximum torque limit changes with the temperature of the catalyst. It should be noted that the set maximum torque limit is not limited to the parameters in this embodiment, and can be set according to the specific conditions of the vehicle:
[0069] Table 1 Parameter table of the first preset relationship
[0070]
[0071] Then, the required torque of the engine is obtained according to the accelerator pedal opening value input by the driver through the accelerator pedal, and the required catalyst temperature corresponding to the required torque is obtained according to the second preset relationship, wherein the second preset relationship is the relationship between the accelerator pedal opening value, the catalyst temperature and the filter factor. Specifically, in this embodiment, the parameter table of the second preset relationship is shown in Table 2 below:
[0072] Table 2 Parameter table of the second preset relationship
[0073]
[0074]
[0075] It can be seen from Table 2 above that when the accelerator pedal opening value is larger, the filter factor is smaller, and the rising slope of the engine output torque is larger; when the catalyst temperature is larger, the filter factor is smaller, and the rising slope of the engine output torque is larger. In other words, during the catalyst heating process, when the vehicle driver accelerates, the rising slope of the engine output torque corresponding to different throttle opening change values is different, and the rising slope of the engine output torque increases with the increase of the catalyst temperature. In this way, the present application can not only reduce the emission of pollutants after the vehicle cold engine start, but also meet the driver's demand for power and ensure the driver's driving experience. It should be understood that the parameter setting in the second preset relationship in the present application can be calibrated according to the specific situation of the vehicle, and is not limited to the parameter values in Table 2 above.
[0076] S107: If the current temperature of the catalyst is greater than the catalyst temperature threshold, the required torque is obtained according to the accelerator pedal opening value, and the required torque is output.
[0077] Specifically, in this embodiment, when the current temperature of the catalyst is greater than 350°C, it can be seen from the first preset relationship that the corresponding maximum torque limit of the engine is 100%, that is, the torque output of the engine is not restricted. At this time, the required torque of the engine can be obtained according to the accelerator pedal opening value input by the vehicle driver through the accelerator pedal, and the required torque is output as the output torque of the engine. It should be understood that the output of the engine torque is sensitive to changes in the accelerator pedal opening value, and the vehicle can accelerate normally without affecting the drivability of the vehicle.
[0078] S108: Determine whether the maximum torque limit is less than the required torque.
[0079] S109. If the maximum torque limit is less than the required torque, the catalyst is heated to make the catalyst temperature reach the required catalyst temperature, and the torque is output in combination with a filter factor until the actual output torque reaches the required torque, where the filter factor is a relationship between the accelerator pedal opening change value and the catalyst temperature.
[0080] Specifically, in this embodiment, as shown in Table 2 above, the filter factor when the accelerator pedal opening change value is greater than 80% is less than the filter factor when the accelerator pedal opening change value is less than 80%. That is to say, when the accelerator pedal opening change value is greater than 80%, the engine output torque rate rises quickly, which can meet the vehicle driver's emergency acceleration scenario requirements; and when the accelerator pedal opening change value is less than 80%, the engine output torque rate rises slowly, which can reduce the catalyst heating process to assist the driver to drive gently and reduce the amount of pollutants generated. Furthermore, in the process of heating the catalyst so that the catalyst temperature reaches the catalyst required temperature, the time for heating the catalyst is usually no more than 30s, which has little impact on the vehicle's drivability and can ensure the normal driving of the vehicle and the driver's driving experience.
[0081] If the maximum torque limit is not less than the required torque, step S107 is executed. It should be noted that the maximum torque limit of the engine is generally less than or equal to the required torque.
[0082] See also Figure 2 , which is a block diagram of an engine output torque control system of the present invention, the engine output torque control system of the present invention comprises:
[0083] The acquisition module 21 is used to acquire the accelerator pedal opening value and the current water temperature of the engine;
[0084] The first judgment module 22 is used to judge whether the current water temperature is greater than the water temperature threshold;
[0085] The first execution module 23 is used to obtain the current temperature of the catalyst when the current water temperature is greater than the water temperature threshold;
[0086] A second judgment module 24 is used to judge whether the current temperature of the catalyst is greater than a catalyst temperature threshold;
[0087] The second execution module 25 is used for obtaining the maximum torque limit value corresponding to the current catalyst temperature according to the first preset relationship when the current catalyst temperature is not greater than the catalyst temperature threshold; obtaining the required torque according to the accelerator pedal opening value, and obtaining the catalyst required temperature corresponding to the required torque according to the second preset relationship;
[0088] A third judgment module 26 is used to judge whether the maximum torque limit is less than the required torque;
[0089] The third execution module 27 is used to heat the catalyst to make the catalyst temperature reach the catalyst required temperature when the maximum torque limit is less than the required torque, and output the torque in combination with the filter factor until the actual output torque reaches the required torque, and the filter factor is the relationship between the accelerator pedal opening change value and the catalyst temperature.
[0090] An embodiment of the present application further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the engine output torque control method provided above.
[0091] See also Figure 3 , shown is a block diagram of a data processing device of the present invention, the data processing device includes a memory 31, a processor 32 and a computer program stored in the memory and executable on the processor, and when the processor executes the program, the engine output torque control method provided as claimed in the preceding claims is implemented.
[0092] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.
[0093] The above-described embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of application of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention application shall be subject to the attached claims.
Claims
1. A method for controlling engine output torque, characterized in that: include: Get the accelerator pedal opening value and the current engine water temperature; Determine whether the current water temperature is greater than the water temperature threshold; If it is greater than the water temperature threshold, the current temperature of the catalyst is obtained; Determine whether the current temperature of the catalyst is greater than a catalyst temperature threshold; If it is not greater than the catalyst temperature threshold, obtaining the maximum torque limit corresponding to the current catalyst temperature according to the first preset relationship; Obtaining a required torque according to the accelerator pedal opening value, and obtaining a required catalyst temperature corresponding to the required torque according to a second preset relationship; determining whether the maximum torque limit is less than the required torque; If it is less than the required torque, the catalyst is heated to make the catalyst temperature reach the required catalyst temperature, and the torque is output in combination with the filter factor until the actual output torque reaches the required torque. The filter factor is the relationship between the accelerator pedal opening change value and the catalyst temperature.
2. The engine output torque control method according to claim 1, characterized in that: After the step of determining whether the current temperature of the catalyst is greater than the catalyst temperature threshold, the method further includes: If the current temperature of the catalyst is greater than the catalyst temperature threshold, the required torque is obtained according to the accelerator pedal opening value, and the required torque is output.
3. The engine output torque control method according to claim 1, characterized in that: In the step of heating the catalyst so that the catalyst temperature reaches the catalyst required temperature, and outputting the torque in combination with the filter factor until the actual output torque reaches the required torque: The filter factor when the accelerator pedal opening change value is greater than 80% is smaller than the filter factor when the accelerator pedal opening change value is less than 80%.
4. The engine output torque control method according to claim 1, characterized in that: In the step of heating the catalyst so that the catalyst temperature reaches the catalyst required temperature: The time for heating the catalyst shall not exceed 30 seconds.
5. The engine output torque control method according to claim 1, characterized in that: After the step of determining whether the current water temperature is greater than the water temperature threshold, the following steps are further included: When the current water temperature is not greater than the water temperature threshold, the engine torque is not limited.
6. The engine output torque control method according to claim 1, characterized in that: The first preset relationship is the relationship between the catalyst temperature and the maximum torque limit, where: When the catalyst temperature is -10°C, the maximum torque limit is 60%; When the catalyst temperature is 0°C, the maximum torque limit is 70%; When the catalyst temperature is 250°C, the maximum torque limit is 80%; When the catalyst temperature is 350°C, the maximum torque limit is 100%; When the catalyst temperature is 500°C, the maximum torque limit is 100%.
7. The engine output torque control method according to claim 1, characterized in that: The second preset relationship is the relationship between the accelerator pedal opening value, the catalyst temperature and the filter factor, where: The larger the accelerator pedal opening value, the smaller the filter factor, and the greater the rising slope of the output torque; The higher the catalyst temperature, the smaller the filter factor and the greater the rising slope of the output torque.
8. An engine output torque control system, characterized in that: include: The acquisition module is used to obtain the accelerator pedal opening value and the current water temperature of the engine; The first judgment module is used to judge whether the current water temperature is greater than the water temperature threshold; A first execution module, used for obtaining the current temperature of the catalyst when the current water temperature is greater than the water temperature threshold; A second judgment module is used to judge whether the current temperature of the catalyst is greater than the catalyst temperature threshold; A second execution module, configured to obtain a maximum torque limit value corresponding to the current temperature of the catalyst according to a first preset relationship when the current temperature of the catalyst is not greater than a catalyst temperature threshold; Obtaining a required torque according to the accelerator pedal opening value, and obtaining a required catalyst temperature corresponding to the required torque according to a second preset relationship; A third judgment module, used for judging whether the maximum torque limit is less than the required torque; The third execution module is used to heat the catalyst to make the catalyst temperature reach the catalyst required temperature when the maximum torque limit is less than the required torque, and output the torque in combination with the filter factor until the actual output torque reaches the required torque, and the filter factor is the relationship between the accelerator pedal opening change value and the catalyst temperature.
9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the engine output torque control method as described in any one of claims 1 to 7 is implemented.
10. A data processing device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the engine output torque control method as described in any one of claims 1 to 7 is implemented.