A vehicle engine intake air temperature management control system and method
By using an intake air temperature adjustment mechanism and an intelligent control system, the problem of icing caused by excessively low intake air temperature in natural gas engines under low-temperature conditions has been solved, enabling stable operation and power output of the engine in low-temperature environments.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- BEIJING FOTON CUMMINS ENGINE
- Filing Date
- 2024-12-11
- Publication Date
- 2026-06-12
AI Technical Summary
In low-temperature environments, excessively low intake temperatures in natural gas engines can cause ice formation in the intake and exhaust gas recirculation systems, affecting engine power output and vehicle operating conditions.
It employs an intake air temperature adjustment mechanism and an engine control unit, which adjust the engine intake air temperature through a variable cross-section intake grille and an electronically controlled intercooler windshield. Combined with an intake air temperature sensor and an intelligent intake management control module, it monitors and controls the intake air temperature in real time to prevent icing.
To ensure stable and efficient engine operation in low-temperature environments, avoid malfunctions in the intake and exhaust gas recirculation systems, improve power output, and ensure vehicle stability and performance in low-temperature environments.
Smart Images
Figure CN122190934A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of engine technology, and more specifically to a vehicle engine intake air temperature management and control system and method. Background Technology
[0002] Natural gas engines employ exhaust gas recirculation (EGR) systems primarily to control emissions while effectively controlling knocking. However, natural gas's main component is methane (CH4), which has a high hydrogen content. Compared to diesel engines, natural gas engines produce more water vapor after combustion. During winter operation, the vehicle's intake air temperature is very low, generally below 0 degrees Celsius, and can even drop below -20 degrees Celsius. Especially after a cold start, the engine intake manifold temperature remains below 0 degrees Celsius. When the engine requires EGR to operate, the water vapor-containing exhaust gas mixes with the cold intake air, causing rapid condensation and freezing. This can lead to various malfunctions in the intake and EGR systems, affecting intake model calculations. The engine's power output will be partially limited by the control system, directly impacting the vehicle's operating performance in low-temperature environments. Summary of the Invention
[0003] The purpose of this invention is to provide a vehicle engine intake air temperature management and control system and method to prevent the engine intake air temperature from being too low and affecting the vehicle's operating status when the vehicle is running in a low-temperature environment.
[0004] To achieve the above objectives, in a first aspect, embodiments of the present invention provide a vehicle engine intake air temperature management and control system. The system includes: an intake air temperature adjustment mechanism disposed at the intake end of the engine compartment for adjusting the engine's intake air temperature; an intake air temperature sensor disposed at the engine's intake port for detecting the engine's intake air temperature; and an engine control unit, including an intake air temperature demand value calculation module and an intelligent intake air management control module, wherein: the intake air temperature demand value calculation module calculates an intake air temperature demand value based on ambient temperature, engine speed, and engine indicated torque; and the intelligent intake air management control module controls the intake air temperature adjustment mechanism based on the intake air temperature demand value and the engine's intake air temperature.
[0005] Optionally, calculating the intake air temperature requirement based on ambient temperature, engine speed, and engine indicated torque includes: acquiring the ambient temperature, engine speed, and engine indicated torque; calculating the combustion parameters of the current engine operating conditions based on the engine speed and engine indicated torque; and calculating the intake air temperature requirement in a pre-established engine calibration model based on the ambient temperature and the combustion parameters.
[0006] Optionally, the intake air temperature adjustment mechanism includes a first adjustment mechanism and / or a second adjustment mechanism, wherein: the first adjustment mechanism includes: a variable cross-section intake grille, including blades, installed at the front end of the vehicle, adjusting the engine intake air temperature by changing the blade angle; and a variable intake grille position sensor, disposed on the variable cross-section intake grille, for detecting the blade angle of the variable cross-section intake grille; the second adjustment mechanism includes: an electronically controlled intercooler windshield, installed in front of the intercooler of the vehicle, shielding the intercooler, changing the shielding area of the intercooler by changing its position; and an electronically controlled intercooler windshield position sensor, for detecting the position of the electronically controlled intercooler windshield.
[0007] Optionally, controlling the intake temperature adjustment mechanism based on the intake temperature requirement and the engine intake temperature includes: determining whether the engine intake temperature is less than the intake temperature requirement; if so, adjusting the blade angle of the variable cross-section intake grille to reduce the gas passage area of the variable cross-section intake grille; and stopping the adjustment of the variable cross-section intake grille when the engine intake temperature is not less than the intake temperature requirement, or when the blade angle reaches a first angle, wherein the first angle is the limit angle that the blades of the variable cross-section intake grille can be adjusted to.
[0008] Optionally, controlling the intake air temperature adjustment mechanism based on the intake air temperature requirement and the engine intake air temperature further includes: determining whether the engine intake air temperature is less than the intake air temperature requirement; if so, adjusting the position of the electronically controlled intercooler windshield to reduce the area of the electronically controlled intercooler windshield obstructing the intercooler; and stopping the adjustment of the position of the electronically controlled intercooler windshield when the engine intake air temperature is not less than the intake air temperature requirement.
[0009] Optionally, the engine control unit further includes: a start-stop control module, used to control the start-stop of the intelligent intake management control module based on the engine's intake air temperature or icing diagnostic results, wherein controlling the start-stop of the intelligent intake management control module based on the engine's intake air temperature includes: comparing the engine's intake air temperature with a first temperature threshold; if the engine's intake air temperature is less than the first temperature threshold, then activating the intelligent intake management control module; and comparing the engine's intake air temperature with a second temperature threshold; if the engine's intake air temperature is greater than the second temperature threshold, then deactivating the intelligent intake management control module. The module, wherein the first temperature threshold is less than the second temperature threshold, and the first and second temperature thresholds are pre-calibrated values or values calculated based on operating parameters, including intake manifold pressure, ambient temperature, ambient pressure, engine coolant temperature and / or aftertreatment inlet temperature, controls the start and stop of the intelligent intake management control module based on the icing diagnosis result, including: performing an icing diagnosis on the vehicle; if the icing diagnosis result is low-temperature icing, then activating the intelligent intake management control module, wherein the icing diagnosis result is calculated based on the misfire integral and diagnosis result, the EGR flow diagnosis result, and the intake pressure diagnosis result.
[0010] Optionally, the engine control unit is also configured to perform the following operations when the vehicle is started: activate the intelligent intake management control module; calculate the intake temperature requirement value; and initialize the intake temperature adjustment mechanism based on the intake temperature requirement value and the engine's intake temperature.
[0011] On the other hand, embodiments of the present invention provide a vehicle engine intake air temperature management and control method, the method comprising: calculating an intake air temperature demand value based on ambient temperature, engine speed and engine indicated torque; and controlling an intake air temperature adjustment mechanism based on the intake air temperature demand value and the engine intake air temperature, wherein the intake air temperature adjustment mechanism is disposed at the intake end of the engine compartment and is used to adjust the engine intake air temperature.
[0012] Optionally, calculating the intake air temperature requirement based on ambient temperature, engine speed, and engine indicated torque includes: acquiring the ambient temperature, the engine speed, and the engine indicated torque; calculating the combustion parameters for the current engine operating conditions based on the engine speed and engine indicated torque; and calculating the intake air temperature requirement in a pre-established engine calibration model based on the ambient temperature and the combustion parameters.
[0013] Optionally, controlling the intake temperature adjustment mechanism based on the intake temperature requirement and the engine's intake temperature includes: executing a first adjustment method and / or a second adjustment method, wherein: the first adjustment method includes: determining whether the engine's intake temperature is less than the intake temperature requirement; if so, adjusting the blade angle of the variable cross-section intake grille of the intake temperature adjustment mechanism to reduce the gas passage area of the variable cross-section intake grille; and stopping the adjustment of the variable cross-section intake grille when the engine's intake temperature is not less than the intake temperature requirement, or when the blade angle reaches a first angle, wherein the first angle is the limit angle that the blades of the variable cross-section intake grille can be adjusted; the second adjustment method includes: determining whether the engine's intake temperature is less than the intake temperature requirement; if so, adjusting the position of the electronically controlled intercooler windshield of the intake temperature adjustment mechanism to reduce the area of the electronically controlled intercooler windshield obstructing the intercooler; and stopping the adjustment of the position of the electronically controlled intercooler windshield when the engine's intake temperature is not less than the intake temperature requirement.
[0014] Through the above technical solution, during vehicle operation, the intake air temperature sensor monitors the engine's intake air temperature in real time and transmits the data to the engine control unit. The engine control unit compares the engine's intake air temperature with the required intake air temperature. If the engine's intake air temperature is lower than the required value, the intelligent intake management control module controls the intake air temperature adjustment mechanism to increase the engine's intake air temperature. The required intake air temperature is based on the actual ambient temperature, engine speed, and engine indicated torque, enabling a more accurate determination of the current required intake air temperature and ensuring stable and efficient vehicle operation in low-temperature environments.
[0015] Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description section. Attached Figure Description
[0016] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings:
[0017] Figure 1 This is a schematic diagram of the vehicle engine intake air temperature management and control system provided in an embodiment of the present invention.
[0018] Figure 2 This is a schematic diagram of the vehicle structure provided in an embodiment of the present invention.
[0019] Figure 3 This is a schematic block diagram of the intake air temperature management and control logic provided in an embodiment of the present invention.
[0020] Figure 4 This is another schematic block diagram of intake air temperature management and control logic provided in an embodiment of the present invention.
[0021] Explanation of reference numerals in the attached figures
[0022] 1. Engine control unit; 2. Variable geometry air intake grille
[0023] 3. Variable intake grille position sensor; 4. Electronically controlled intercooler windshield position sensor
[0024] 5. Electronically controlled intercooler windshield curtain; 6. Intercooler
[0025] 7. Intake throttle valve; 8. Intake air temperature and pressure sensor
[0026] 9. Exhaust gas recirculation control valve; 10. Natural gas supply cylinder
[0027] 11 Aftertreatment inlet temperature sensor 12 Three-way catalytic converter Detailed Implementation
[0028] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.
[0029] Figure 1 This is a schematic diagram of the structure of the vehicle engine intake air temperature management and control system provided in an embodiment of the present invention. Figure 2 This is a schematic diagram of the vehicle structure provided in an embodiment of the present invention. Figure 1 and Figure 2 As shown, the system provided by the present invention includes the following structure.
[0030] An intake air temperature adjustment mechanism is located at the intake end of the engine compartment and is used to adjust the intake air temperature of the engine.
[0031] An intake air temperature sensor is installed at the engine's air intake to detect the engine's intake air temperature. Please refer to [reference needed]. Figure 2 An intake air temperature and pressure sensor 8 is installed on the engine's intake manifold, integrating the intake air temperature sensor and the intake air pressure sensor together for a simpler structure.
[0032] The engine control unit 1 includes an intake air temperature demand calculation module and an intelligent intake air management control module, wherein: the intake air temperature demand calculation module is used to calculate the intake air temperature demand value based on the ambient temperature, engine speed and engine indicated torque; the intelligent intake air management control module is used to control the intake air temperature adjustment mechanism based on the intake air temperature demand value and the engine's intake air temperature.
[0033] The vehicle engine intake air temperature management and control system proposed in this invention includes an intake air temperature adjustment mechanism capable of adjusting the engine's intake air temperature. The required intake air temperature value is derived from the actual ambient temperature, engine speed, and engine indicated torque, enabling a more accurate determination of the current required intake air temperature. During vehicle operation, the intake air temperature sensor monitors the engine's intake air temperature in real time and transmits this data to the engine control unit 1. The engine control unit 1 compares the engine's intake air temperature with the required intake air temperature value. If the engine's intake air temperature is lower than the required value, it is considered that the engine's intake air temperature is too low, potentially leading to icing and various malfunctions in the intake and exhaust gas recirculation systems, affecting the vehicle's operating status. In this case, the intelligent intake management and control module controls the intake air temperature adjustment mechanism to increase the engine's intake air temperature, thereby preventing the aforementioned malfunctions, avoiding limited engine power output, and ensuring stable and efficient vehicle operation in low-temperature environments.
[0034] Furthermore, calculating the intake air temperature requirement based on ambient temperature, engine speed, and engine indicated torque includes: acquiring the ambient temperature, engine speed, and engine indicated torque; calculating the combustion parameters of the current engine operating conditions based on the engine speed and engine indicated torque; and calculating the intake air temperature requirement in a pre-established engine calibration model based on the ambient temperature and the combustion parameters.
[0035] It should be noted that the engine calibration model can be established after the engine development work is completed. After the engine development work in the conventional laboratory is completed, combustion parameters corresponding to different engine speeds and indicated torques are collected in environmental chambers and different temperature environments, as well as the normal operating intake air temperature of the engine corresponding to different ambient temperatures, so as to calibrate the required values of ambient temperature, combustion parameters and intake air temperature.
[0036] Furthermore, the intake air temperature adjustment mechanism includes a first adjustment mechanism and / or a second adjustment mechanism, wherein: the first adjustment mechanism includes: a variable cross-section intake grille 2, including blades, installed at the front end of the vehicle, adjusting the engine intake air temperature by changing the blade angle; and a variable intake grille position sensor 3, disposed on the variable cross-section intake grille 2, for detecting the blade angle of the variable cross-section intake grille 2; the second adjustment mechanism includes: an electronically controlled intercooler windshield curtain 5, installed in front of the intercooler 6 of the vehicle, shielding the intercooler 6, changing the shielding area of the intercooler 6 by changing its position; and an electronically controlled intercooler windshield curtain position sensor 4, for detecting the position of the electronically controlled intercooler windshield curtain 5.
[0037] like Figure 2As shown, a variable air intake grille position sensor 3 is installed on one side of the variable air intake grille 2 to detect the blade angle and transmit the blade angle information to the engine control unit 1 for real-time monitoring of the blade angle of the variable air intake grille 2. The blade angle of the variable air intake grille 2 can be adjusted, thereby changing the gas flow cross-sectional area. When it is necessary to increase the engine intake air temperature, reducing the gas flow cross-sectional area can reduce the intake airflow of cold air into the engine compartment, reduce engine heat dissipation, and thus increase the engine intake air temperature.
[0038] The electronically controlled intercooler windshield curtain 5 is used to shield the intercooler 6. By changing the position of the electronically controlled intercooler windshield curtain 5, the shielding area of the intercooler 6 can be changed. When it is necessary to increase the engine intake air temperature, increasing the shielding area of the intercooler 6 can reduce the intake airflow of cold air at the intercooler 6, reduce the heat dissipation of the intercooler 6, and thus increase the engine intake air temperature. An electronically controlled intercooler windshield curtain position sensor 4 is installed on one side of the electronically controlled intercooler windshield curtain 5, which can detect the position of the electronically controlled intercooler windshield curtain 5 and transmit the position information to the engine control unit 1 for real-time monitoring of the position of the electronically controlled intercooler windshield curtain 5.
[0039] from Figure 2 As can be seen, the vehicle provided in this embodiment of the invention also includes: an intake throttle valve 7 (IAT) for controlling the amount of intake air entering the engine; an exhaust gas recirculation control valve 9 (EGR) for reintroducing a portion of the exhaust gas into the intake system, where it participates in combustion again; a natural gas supply cylinder 10 for storing and supplying fuel to the engine; an aftertreatment inlet temperature sensor 11 for monitoring the engine exhaust temperature; and a three-way catalytic converter 12 for purifying the vehicle's exhaust gases. These structures are all related to the operation of the engine, and their functions are common knowledge in this technical field; therefore, this invention will not elaborate further.
[0040] Furthermore, based on the required intake air temperature and the engine's intake air temperature, controlling the intake air temperature adjustment mechanism includes: determining whether the engine's intake air temperature is less than the required intake air temperature; if so, adjusting the blade angle of the variable cross-section intake grille 2 to reduce the gas passage area of the variable cross-section intake grille 2; and stopping the adjustment of the variable cross-section intake grille 2 when the engine's intake air temperature is not less than the required intake air temperature, or when the blade angle reaches a first angle, wherein the first angle is the limit angle that the blades of the variable cross-section intake grille 2 can be adjusted to.
[0041] Figure 3 This is a schematic block diagram of the intake air temperature management and control logic provided in an embodiment of the present invention. Figure 4 This is another schematic block diagram of intake air temperature management and control logic provided in an embodiment of the present invention. For example... Figure 3and Figure 4 As shown, when the engine's intake air temperature is lower than the required intake air temperature, the intake air temperature management controller (PID) in the intelligent intake management control module sends the requirement to reduce the intake grille opening and the intake grille blade angle to the intake grille position controller (PID). Based on this requirement, the intake grille controller (PID) calculates the required intake grille drive current and sends this requirement value and the intake grille drive current feedback value to the intake grille motor controller (PID) to adjust the variable cross-section intake grille 2. During adjustment of the variable cross-section intake grille 2, the engine's intake air temperature is monitored in real time to obtain the intake air temperature feedback value. If the intake air temperature feedback value is not lower than the required intake air temperature, the adjustment of the variable cross-section intake grille 2 is stopped, thus forming a closed-loop control.
[0042] It is understandable that there are limits to the adjustment of the blade angle. In some extreme environments, if the blade angle reaches its limit and still cannot meet the required intake air temperature, the system will stop adjusting the intake grille angle and inform the driver so that other measures can be taken based on the actual situation.
[0043] Furthermore, based on the required intake air temperature and the engine's intake air temperature, controlling the intake air temperature adjustment mechanism further includes: determining whether the engine's intake air temperature is less than the required intake air temperature; if so, adjusting the position of the electronically controlled intercooler windshield curtain 5 to reduce the area of the electronically controlled intercooler windshield curtain 5 obstructing the intercooler 6; and stopping the adjustment of the position of the electronically controlled intercooler windshield curtain 5 when the engine's intake air temperature is not less than the required intake air temperature.
[0044] like Figure 3 and Figure 4 As shown, when the engine's intake air temperature is lower than the required intake air temperature value, the intake air temperature management controller (PID) in the intelligent intake air management control module sends the requirement to adjust the intercooler windshield opening and the intercooler windshield opening position to the intercooler windshield position controller (PID). The intercooler windshield position controller (PID) calculates the required intercooler windshield drive current value based on this requirement and sends this required value and the intercooler windshield drive current feedback value to the intercooler windshield motor controller (PID) to adjust the position of the electronically controlled intercooler windshield 5. During the adjustment of the electronically controlled intercooler windshield 5, the engine's intake air temperature is monitored in real time to obtain an intake air temperature feedback value. If the intake air temperature feedback value is not lower than the required intake air temperature value, the adjustment of the electronically controlled intercooler windshield 5's position is stopped, thus forming a closed-loop control.
[0045] When both the first and second adjustment mechanisms exist in the system, both mechanisms can be adjusted simultaneously or sequentially. For example, the blade angle of the variable cross-section intake grille 2 can be adjusted first. If the blade angle reaches its limit and still cannot meet the intake temperature requirement, then the position of the electronically controlled intercooler curtain 5 can be adjusted. The specific adjustment method can be adjusted according to the actual situation.
[0046] from Figure 3 and Figure 4 As can be seen, the system proposed in this invention includes a large closed-loop system with two embedded double-loop closed loops. Several closed-loop systems are controlled independently, and the intake air temperature can be controlled individually or coupled to control the intake air temperature. It has advantages in terms of control accuracy and efficiency.
[0047] Furthermore, the engine control unit 1 also includes a start-stop control module, used to control the start-stop of the intelligent intake management control module based on the engine's intake air temperature or icing diagnostic results.
[0048] The method of controlling the start and stop of the intelligent intake management control module based on the engine's intake air temperature includes: comparing the engine's intake air temperature with a first temperature threshold; if the engine's intake air temperature is less than the first temperature threshold, then activating the intelligent intake management control module; and comparing the engine's intake air temperature with a second temperature threshold; if the engine's intake air temperature is greater than the second temperature threshold, then deactivating the intelligent intake management control module. The first temperature threshold is less than the second temperature threshold, and the first and second temperature thresholds are pre-calibrated values or values calculated based on operating parameters, including intake manifold pressure, ambient temperature, ambient pressure, engine coolant temperature, and / or aftertreatment inlet temperature.
[0049] Controlling the start and stop of the intelligent intake management control module based on the icing diagnosis result includes: performing an icing diagnosis on the vehicle; if the icing diagnosis result is low-temperature icing, then activating the intelligent intake management control module. The icing diagnosis result is calculated based on the misfire integral and diagnosis result, the EGR flow diagnosis result, and the intake pressure diagnosis result.
[0050] In other embodiments of the present invention, the operating parameters used to determine the first temperature threshold and the second temperature threshold may also be other parameters, such as fuel injection quantity or other parameters that can characterize the vehicle's operating conditions.
[0051] The first temperature threshold is the intake air temperature that cannot meet the normal operating requirements of the engine, and its value ranges from approximately 0°C to -20°C. The second temperature threshold is the ideal intake air temperature that meets the normal operating requirements of the engine, and its value ranges from approximately 20°C to 40°C. The specific values of the first and second temperature thresholds can be determined experimentally after the engine development is completed, and the first and second temperature thresholds can be calibrated in advance. Alternatively, through experiments, the engine operating status under different operating parameters and different engine intake air temperatures can be collected to establish the relationship between different operating parameters and the normal operating intake air temperature of the engine, thereby obtaining the first and second temperature thresholds corresponding to different operating parameters. When the vehicle is running, after collecting the actual operating parameters of the vehicle, the current first and second temperature thresholds can be calculated accordingly.
[0052] When the intake air temperature is below the first temperature threshold, it can be considered that the intake air temperature does not meet the requirements for normal engine operation. At this time, the intelligent intake air management control module is activated to manage and control the engine's intake air temperature. Conversely, when the intake air temperature is above the second temperature threshold, it can be considered that the intake air temperature meets the requirements for normal engine operation. At this time, the intelligent intake air management control module is deactivated to avoid unnecessary energy consumption. It should be noted that when the intake air temperature is between the first and second temperature thresholds, if the intelligent intake air management control module is in the activated state, it will remain activated; if it is in the deactivated state, it will remain deactivated.
[0053] It should be noted that the misfire score and diagnostic results, EGR flow diagnostic results, and intake pressure diagnostic results can all be directly obtained through the existing vehicle's electronic control unit. After introducing icing diagnostic information, the vehicle's operating scenario can be judged more accurately. Once the diagnostic result shows low-temperature icing, the engine control unit 1 will activate the intelligent intake management control module.
[0054] The start-stop control module controls the start and stop of the intelligent intake management control module. When it is necessary to adjust the engine intake air temperature, the intelligent intake management control module is turned on, which effectively improves the vehicle's operating status and performance in low-temperature environments. When it is not necessary to adjust the engine intake air temperature, the intelligent intake management control module is turned off, avoiding waste of resources.
[0055] Furthermore, the engine control unit 1 is also used to perform the following operations when the vehicle is started: start the intelligent intake management control module; calculate the intake temperature requirement value; and initialize the intake temperature adjustment mechanism based on the intake temperature requirement value and the engine's intake temperature.
[0056] When the vehicle starts, the required intake air temperature is calculated, and the intake air temperature adjustment mechanism is initialized to ensure that the current intake air temperature adjustment mechanism matches the required intake air temperature, thereby ensuring that the vehicle can quickly enter normal operating condition and improve the driving experience.
[0057] After the vehicle starts, the engine control unit 1 synchronously records and saves information such as ambient temperature, engine speed, torque, intake air temperature, the position of the intake air temperature adjustment mechanism, and operating parameters. It also monitors the engine combustion status, exhaust temperature, and knock performance. When the combustion status or performance is not ideal, the electronic control unit can adaptively adjust the intelligent intake air temperature management and control system to ensure the intake air temperature remains within the ideal range. For example, based on actual conditions, it updates the first and second temperature thresholds corresponding to different operating parameters, achieving adaptive intelligent calibration customization for the vehicle.
[0058] This invention also provides a method for managing and controlling the intake air temperature of a vehicle engine. The method includes: calculating an intake air temperature requirement based on ambient temperature, engine speed, and engine indicated torque; and controlling an intake air temperature adjustment mechanism based on the intake air temperature requirement and the engine's intake air temperature. The intake air temperature adjustment mechanism is located at the intake end of the engine compartment and is used to adjust the engine's intake air temperature.
[0059] Furthermore, calculating the intake air temperature requirement based on ambient temperature, engine speed, and engine indicated torque includes: acquiring the ambient temperature, the engine speed, and the engine indicated torque; calculating the combustion parameters of the current engine operating conditions based on the engine speed and engine indicated torque; and calculating the intake air temperature requirement in a pre-established engine calibration model based on the ambient temperature and the combustion parameters.
[0060] Furthermore, based on the required intake air temperature and the engine's intake air temperature, controlling the intake air temperature adjustment mechanism includes: executing a first adjustment method and / or a second adjustment method.
[0061] The first adjustment method includes: determining whether the intake air temperature of the engine is less than the required intake air temperature value; if so, adjusting the blade angle of the variable cross-section intake grille 2 of the intake air temperature adjustment mechanism to reduce the gas passage area of the variable cross-section intake grille 2; and stopping the adjustment of the variable cross-section intake grille 2 when the intake air temperature of the engine is not less than the required intake air temperature value, or when the blade angle reaches a first angle, wherein the first angle is the limit angle that the blade of the variable cross-section intake grille 2 can be adjusted to.
[0062] The second adjustment method includes: determining whether the intake air temperature of the engine is less than the required intake air temperature value; if so, adjusting the position of the electronically controlled intercooler windshield 5 of the intake air temperature adjustment mechanism to reduce the area of the electronically controlled intercooler windshield 5 covering the intercooler 6; and stopping the adjustment of the position of the electronically controlled intercooler windshield 5 when the intake air temperature of the engine is not less than the required intake air temperature value.
[0063] Furthermore, the method also includes: determining whether to control the intake air temperature adjustment mechanism based on the engine's intake air temperature or icing diagnosis results.
[0064] The method of determining whether to control the intake air temperature adjustment mechanism based on the engine's intake air temperature includes: comparing the engine's intake air temperature with a first temperature threshold; if the engine's intake air temperature is less than the first temperature threshold, then controlling the intake air temperature adjustment mechanism; and comparing the engine's intake air temperature with a second temperature threshold; if the engine's intake air temperature is greater than the second temperature threshold, then not controlling the intake air temperature adjustment mechanism. The first temperature threshold is less than the second temperature threshold, and the first and second temperature thresholds are pre-calibrated values or values calculated based on operating parameters, including intake manifold pressure, ambient temperature, ambient pressure, engine coolant temperature, and / or aftertreatment inlet temperature.
[0065] Determining whether to control the intake air temperature adjustment mechanism based on the icing diagnosis results includes: performing an icing diagnosis on the vehicle; if the icing diagnosis result is low-temperature icing, then controlling the intake air temperature adjustment mechanism. The icing diagnosis result is calculated based on the misfire integral and diagnosis result, the EGR flow diagnosis result, and the intake pressure diagnosis result.
[0066] Furthermore, the method also includes performing the following operations when the vehicle is started: calculating the intake air temperature requirement value; and initializing the intake air temperature adjustment mechanism based on the intake air temperature requirement value and the engine intake air temperature.
[0067] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.
[0068] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.
[0069] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.
[0070] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.
[0071] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.
[0072] Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.
[0073] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.
[0074] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.
[0075] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.
Claims
1. A vehicle engine intake air temperature management and control system, characterized in that, The system includes: An intake air temperature adjustment mechanism is located at the intake end of the engine compartment and is used to adjust the intake air temperature of the engine. An intake air temperature sensor is installed at the engine intake port to detect the engine intake air temperature; and The engine control unit includes an intake air temperature demand calculation module and an intelligent intake air management control module, wherein: The intake air temperature requirement calculation module is used to calculate the intake air temperature requirement based on ambient temperature, engine speed and engine indicated torque. The intelligent intake management and control module is used to control the intake temperature adjustment mechanism based on the intake temperature requirement value and the engine's intake temperature.
2. The system according to claim 1, characterized in that, Based on ambient temperature, engine speed, and engine indicated torque, the required intake air temperature is calculated as follows: The ambient temperature, engine speed, and engine indicated torque are obtained. Based on the engine speed and indicated engine torque, calculate the combustion parameters for the current engine operating conditions; and Based on the ambient temperature and the combustion parameters, the required intake air temperature is calculated in a pre-established engine calibration model.
3. The system according to claim 1, characterized in that, The intake air temperature adjustment mechanism includes a first adjustment mechanism and / or a second adjustment mechanism, wherein: The first adjustment mechanism includes: A variable-section air intake grille, including blades, is mounted at the front of the vehicle and adjusts the engine's intake air temperature by changing the blade angle; and A variable intake grille position sensor is installed on the variable cross-section intake grille to detect the blade angle of the variable cross-section intake grille. The second adjustment mechanism includes: An electronically controlled intercooler windshield curtain is installed in front of the intercooler of the vehicle to shield the intercooler; the shielding area is adjusted by changing its position. An electronically controlled intercooler windshield position sensor is used to detect the position of the electronically controlled intercooler windshield.
4. The system according to claim 3, characterized in that, Controlling the intake air temperature adjustment mechanism based on the required intake air temperature and the engine's intake air temperature includes: Determine whether the engine's intake air temperature is lower than the required intake air temperature. If so, adjust the blade angle of the variable cross-section intake grille to reduce the gas passage area of the variable cross-section intake grille; and When the engine's intake air temperature is not less than the required intake air temperature, or when the blade angle reaches a first angle, the adjustment of the variable cross-section intake grille is stopped. Wherein, the first angle is the limit angle that the blades of the variable cross-section air intake grille can be adjusted to.
5. The system according to claim 3, characterized in that, Based on the required intake air temperature and the engine's intake air temperature, controlling the intake air temperature adjustment mechanism further includes: Determine whether the engine's intake air temperature is lower than the required intake air temperature. If so, adjust the position of the electronically controlled intercooler windshield curtain to reduce its obstruction of the intercooler. When the intake air temperature of the engine is not less than the required intake air temperature value, the adjustment of the position of the electronically controlled intercooler windshield curtain is stopped.
6. The system according to claim 1, characterized in that, The engine control unit also includes: The start-stop control module is used to control the start-stop of the intelligent intake management control module based on the engine's intake air temperature or icing diagnostic results. The starting and stopping of the intelligent intake management control module based on the engine's intake air temperature includes: The engine's intake air temperature is compared with a first temperature threshold. If the engine's intake air temperature is lower than the first temperature threshold, the intelligent intake management control module is activated. The engine's intake air temperature is compared with a second temperature threshold. If the engine's intake air temperature is greater than the second temperature threshold, the intelligent intake management control module is shut down. Wherein, the first temperature threshold is less than the second temperature threshold, and the first and second temperature thresholds are pre-calibrated values or values calculated based on operating parameters, including intake manifold pressure, ambient temperature, ambient pressure, engine coolant temperature, and / or aftertreatment inlet temperature. Controlling the start and stop of the intelligent intake management control module based on the icing diagnosis results includes: The vehicle undergoes an icing diagnosis. If the diagnosis indicates low-temperature icing, the intelligent intake management control module is activated. The icing diagnosis results are calculated based on the misfire integral and diagnosis results, the EGR flow diagnosis results, and the intake pressure diagnosis results.
7. The system according to claim 1, characterized in that, The engine control unit is also used to perform the following operations when the vehicle is started: The intelligent intake management and control module is activated; Calculate the required intake air temperature; and Based on the required intake air temperature and the engine's intake air temperature, the intake air temperature adjustment mechanism is initialized.
8. A method for managing and controlling the intake air temperature of a vehicle engine, characterized in that, The method includes: Calculate the required intake air temperature based on ambient temperature, engine speed, and engine indicated torque; and The intake air temperature adjustment mechanism is controlled based on the required intake air temperature and the engine's intake air temperature. The intake air temperature adjustment mechanism is located at the intake end of the engine compartment and is used to adjust the intake air temperature of the engine.
9. The method according to claim 8, characterized in that, Based on ambient temperature, engine speed, and engine indicated torque, the required intake air temperature is calculated as follows: Acquire ambient temperature, engine speed, and engine indicated torque; Based on the engine speed and indicated engine torque, calculate the combustion parameters for the current engine operating conditions; and Based on the ambient temperature and the combustion parameters, the required intake air temperature is calculated in a pre-established engine calibration model.
10. The method according to claim 8, characterized in that, Based on the required intake air temperature and the engine's intake air temperature, controlling the intake air temperature adjustment mechanism includes: executing a first adjustment method and / or a second adjustment method, wherein: The first adjustment method includes: Determine whether the engine's intake air temperature is lower than the required intake air temperature. If so, adjust the blade angle of the variable cross-section intake grille of the intake air temperature adjustment mechanism to reduce the gas passage area of the variable cross-section intake grille; and When the engine's intake air temperature is not less than the required intake air temperature, or when the blade angle reaches a first angle, the adjustment of the variable cross-section intake grille is stopped. Wherein, the first angle is the limit angle that the blades of the variable cross-section air intake grille can be adjusted to. The second adjustment method includes: Determine whether the engine's intake air temperature is lower than the required intake air temperature. If so, adjust the position of the electronically controlled intercooler windshield of the intake air temperature adjustment mechanism to reduce the area of the electronically controlled intercooler windshield obstructing the intercooler; and When the intake air temperature of the engine is not less than the required intake air temperature value, the adjustment of the position of the electronically controlled intercooler windshield curtain is stopped.