Vehicle control method, control system and related device

Abstract

The invention provides a vehicle control method and system and a related device, and relates to the field of engine control. A catalytic converter is arranged in an exhaust pipeline of a vehicle, and the method comprises the steps that the first exhaust temperature and the second exhaust temperature in an exhaust system of the vehicle are monitored, the first exhaust temperature is the exhaust temperature before passing through the catalytic converter, and the second exhaust temperature is the exhaust temperature after passing through the catalytic converter; if the second exhaust temperature is larger than or equal to the first exhaust temperature, the oxygen content concentration in the exhaust is obtained; according to the oxygen content concentration, the actual air-fuel ratio of the vehicle is determined; and if the actual air-fuel ratio is smaller than or equal to the theoretical air-fuel ratio, the fuel injection quantity of an engine fuel injector of the vehicle is adjusted according to the actual air-fuel ratio, so that the temperature of an exhaust tail pipe in the exhaust pipeline is reduced. The risk that pedestrians near the exhaust tail pipe are scalded can be reduced.

Description

Technical Field

[0001] The present application relates to the field of engine control, and in particular to a vehicle control method, a control system and related devices. Background Art

[0002] With the rapid development of the automobile industry, vehicles need to cope with various complex scenarios in daily use, which puts higher requirements on the active and passive safety of vehicles, all of which are aimed at protecting the safety of drivers, passengers and pedestrians. As an important means of transportation for urban public transportation and inter-city operations, buses, especially buses as public transportation, face densely populated urban scenes, and the operating stations are relatively short, so the safety requirements are more prominent. Among them, buses include internal combustion engine buses. For internal combustion engine buses, the engine is usually arranged at the rear of the vehicle, and the exhaust system is affected by the engine layout, which makes the exhaust pipe shorter, resulting in a relatively high temperature of the exhaust tail pipe, which increases the risk of burns to pedestrians near the exhaust tail pipe.

[0003] Therefore, there is an urgent need to provide a vehicle control solution that can reduce the risk of scalding and ensure the safe operation of the vehicle. Summary of the invention

[0004] The present application provides a vehicle control method, a control system and related devices to reduce the risk of scalding for pedestrians near the exhaust tail pipe.

[0005] In a first aspect, the present application provides a vehicle control method, wherein a catalytic converter is provided in an exhaust pipe of the vehicle, comprising:

[0006] Monitoring a first exhaust temperature and a second exhaust temperature in an exhaust system of a vehicle, wherein the first exhaust temperature is the exhaust temperature before passing through a catalytic converter, and the second exhaust temperature is the exhaust temperature after passing through the catalytic converter;

[0007] If the second exhaust gas temperature is greater than or equal to the first exhaust gas temperature, obtaining the oxygen content concentration in the exhaust gas;

[0008] Determine the actual air-fuel ratio of the vehicle based on the oxygen content concentration;

[0009] If the actual air-fuel ratio is less than or equal to the theoretical air-fuel ratio, the fuel injection amount of the vehicle's engine injector is adjusted according to the actual air-fuel ratio to reduce the temperature of the exhaust tail pipe in the exhaust line.

[0010] In a possible implementation, adjusting the fuel injection amount of the engine injector of the vehicle according to the actual air-fuel ratio includes:

[0011] Based on the correspondence between the air-fuel ratio and the fuel injection amount, according to the numerical range of the actual air-fuel ratio, the target fuel injection amount corresponding to the numerical range is determined, and the correspondence relationship represents the correspondence between the numerical range of the air-fuel ratio and the fuel injection amount when the engine reaches the set combustion efficiency;

[0012] The fuel injection amount of the vehicle's engine injector is adjusted to a target fuel injection amount.

[0013] In a possible implementation manner, after adjusting the fuel injection amount of the engine injector of the vehicle, the method further includes:

[0014] Re-obtaining the oxygen content concentration in the exhaust gas;

[0015] Determine the rich air-fuel ratio of the vehicle according to the re-acquired oxygen content concentration, where the rich air-fuel ratio is the ratio of the current air-fuel ratio to the theoretical air-fuel ratio;

[0016] If the rich air-fuel ratio is less than or equal to the ratio threshold, it is determined that the engine injector is faulty and the engine injector fault is reported.

[0017] In a possible implementation manner, after adjusting the fuel injection amount of the engine injector of the vehicle, the method further includes:

[0018] Record the number of times the injection amount is adjusted during the current control phase, and re-obtain the oxygen content concentration in the exhaust gas;

[0019] Determine the rich air-fuel ratio of the vehicle according to the re-acquired oxygen content concentration, where the rich air-fuel ratio is the ratio of the current air-fuel ratio to the theoretical air-fuel ratio;

[0020] If the rich air-fuel ratio is less than or equal to the ratio threshold, and the number of adjustments is less than the number threshold, continue to adjust the injection amount of the vehicle's engine injector;

[0021] If the rich air-fuel ratio is less than or equal to the ratio threshold, and the number of adjustments reaches the number threshold, it is determined that the injector is faulty.

[0022] In a possible implementation manner, an electronically controlled valve is provided in the exhaust tail pipe, and after determining that the engine injector is faulty, the method further includes:

[0023] Control the electric control valve to close to isolate the air.

[0024] In a possible implementation manner, applied to a hybrid vehicle, the method further includes:

[0025] When the battery power of the hybrid vehicle is greater than or equal to the power threshold, the hybrid vehicle is controlled to switch from engine drive to electric motor drive.

[0026] In a possible implementation, the oxygen content concentration is collected by an oxygen sensor, and the actual air-fuel ratio of the exhaust system is determined according to the oxygen content concentration, including:

[0027] According to the oxygen content concentration, determining a voltage value corresponding to the oxygen content concentration;

[0028] Based on the voltage value, the actual air-fuel ratio is determined.

[0029] In a second aspect, the present application provides an exhaust system for a vehicle, wherein a catalytic converter is provided in an exhaust pipe of the exhaust system, and temperature collection components are provided before and after the catalytic converter; an oxygen content concentration collection component is also provided in the exhaust pipe, wherein an electronic control unit of the vehicle is respectively connected to the temperature collection component and the oxygen content concentration collection component, and the electronic control unit is used to execute the first aspect and / or various possible implementation methods of the first aspect.

[0030] In a possible implementation manner, an electrically controlled valve is further provided in the exhaust tail pipe of the exhaust pipeline, and the electronic control unit is further used to control the opening of the electrically controlled valve.

[0031] In a third aspect, the present application provides a vehicle control device, wherein a catalytic converter is provided in an exhaust pipe of the vehicle, and the vehicle control device comprises:

[0032] A monitoring module, used to monitor a first exhaust temperature and a second exhaust temperature in an exhaust system of a vehicle, wherein the first exhaust temperature is the exhaust temperature before passing through a catalytic converter, and the second exhaust temperature is the exhaust temperature after passing through the catalytic converter;

[0033] an acquisition module, configured to acquire the oxygen content concentration in the exhaust gas if the second exhaust gas temperature is greater than or equal to the first exhaust gas temperature;

[0034] A determination module, used for determining an actual air-fuel ratio of the vehicle according to the oxygen content concentration;

[0035] The adjustment module is used to adjust the injection amount of the engine injector of the vehicle according to the actual air-fuel ratio if the actual air-fuel ratio is less than or equal to the theoretical air-fuel ratio, so as to reduce the temperature of the exhaust tail pipe in the exhaust line.

[0036] In a possible implementation manner, the adjustment module is specifically used to:

[0037] Based on the correspondence between the air-fuel ratio and the fuel injection amount, according to the numerical range of the actual air-fuel ratio, the target fuel injection amount corresponding to the numerical range is determined, and the correspondence relationship represents the correspondence between the numerical range of the air-fuel ratio and the fuel injection amount when the engine reaches the set combustion efficiency;

[0038] The fuel injection amount of the vehicle's engine injector is adjusted to a target fuel injection amount.

[0039] In a possible implementation manner, the determination module is specifically configured to:

[0040] Re-obtaining the oxygen content concentration in the exhaust gas;

[0041] Determine the rich air-fuel ratio of the vehicle according to the re-acquired oxygen content concentration, where the rich air-fuel ratio is the ratio of the current air-fuel ratio to the theoretical air-fuel ratio;

[0042] If the rich air-fuel ratio is less than or equal to the ratio threshold, it is determined that the engine injector is faulty and the engine injector fault is reported.

[0043] In a possible implementation manner, the determination module is specifically configured to:

[0044] Record the number of times the injection amount is adjusted during the current control phase, and re-obtain the oxygen content concentration in the exhaust gas;

[0045] Determine the rich air-fuel ratio of the vehicle according to the re-acquired oxygen content concentration, where the rich air-fuel ratio is the ratio of the current air-fuel ratio to the theoretical air-fuel ratio;

[0046] If the rich air-fuel ratio is less than or equal to the ratio threshold, and the number of adjustments is less than the number threshold, continue to adjust the injection amount of the vehicle's engine injector;

[0047] If the rich air-fuel ratio is less than or equal to the ratio threshold, and the number of adjustments reaches the number threshold, it is determined that the injector is faulty.

[0048] In a possible implementation manner, an electronically controlled valve is provided in the exhaust tail pipe, and the vehicle control device further includes a processing module, which is specifically used for:

[0049] Control the electric control valve to close to isolate the air.

[0050] In a possible implementation manner, applied to a hybrid vehicle, the processing module is further used for:

[0051] When the battery power of the hybrid vehicle is greater than or equal to the power threshold, the hybrid vehicle is controlled to switch from engine drive to electric motor drive.

[0052] In a possible implementation manner, the oxygen content concentration is collected by an oxygen sensor, and the determination module is specifically used for:

[0053] According to the oxygen content concentration, determining a voltage value corresponding to the oxygen content concentration;

[0054] Based on the voltage value, the actual air-fuel ratio is determined.

[0055] In a fourth aspect, the present application provides an electronic device, including: a memory, a processor;

[0056] Memory stores computer-executable instructions;

[0057] The processor executes the computer-executable instructions stored in the memory, so that the processor executes the above first aspect and / or various possible implementations of the first aspect.

[0058] In a fifth aspect, the present application provides a computer-readable storage medium, in which computer-executable instructions are stored. When the computer-executable instructions are executed, they are used to implement the above first aspect and / or various possible implementations of the first aspect.

[0059] In a sixth aspect, the present application provides a computer program product, including a computer program, which, when executed, implements the above first aspect and / or various possible implementations of the first aspect.

[0060] The vehicle control method, control system and related devices provided by the present application relate to the field of engine control. In the present application, when the second exhaust temperature is greater than or equal to the first exhaust temperature, wherein the first exhaust temperature is the exhaust temperature before passing through the catalytic converter, and the second exhaust temperature is the exhaust temperature after passing through the catalytic converter, the second exhaust temperature is greater than or equal to the first exhaust temperature, indicating that the catalytic converter is processing an abnormal amount of oil, that is, indicating that an abnormality has occurred in the exhaust system, at this time, the actual air-fuel ratio of the vehicle is determined in combination with the oxygen content concentration in the exhaust gas; when the actual air-fuel ratio is less than or equal to the theoretical air-fuel ratio, the fuel injection amount of the vehicle's engine injector is adjusted according to the actual air-fuel ratio, so that the injected oil can be fully burned in the exhaust system, so as to reduce the temperature of the exhaust tail pipe in the exhaust line and reduce the risk of scalding of pedestrians near the exhaust tail pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0062] Figure 1 Schematic diagram of the vehicle control method provided in this application Figure 1 ;

[0063] Figure 2 A schematic diagram of adding an electronically controlled valve to the exhaust tail pipe provided in an embodiment of the present application;

[0064] Figure 3 A schematic diagram of an exhaust system of a vehicle provided for this application;

[0065] Figure 4 A schematic diagram of the structure of a vehicle control device provided in an embodiment of the present application;

[0066] Figure 5 A schematic diagram of the structure of an electronic device provided in one embodiment of the present application.

[0067] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0068] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0069] The reasons for the excessive temperature of the exhaust tail pipe are mainly caused by the following reasons:

[0070] The cleanliness of the engine injector causes the engine injector to become stuck, which leads to excessive temperature of the exhaust tail pipe: When the engine injector becomes stuck, it causes a long spray, causing the incompletely burned fuel to enter the exhaust pipe and continue to burn at high temperature, generating additional heat, causing the exhaust tail pipe temperature to be too high;

[0071] The corrosiveness of the fuel causes the engine injector to spray too much fuel, resulting in excessive temperature of the exhaust tail pipe: the difference in fuel quality in different regions causes different corrosiveness to parts, causing the engine injector seal to corrode and leak fuel. The incompletely burned fuel enters the exhaust pipe and burns at high temperature, causing the temperature of the exhaust tail pipe to be too high.

[0072] In response to the problem of excessive temperature of the exhaust tail pipe, the present application provides a vehicle control method. When an abnormal situation occurs in the exhaust system, the control method determines the actual air-fuel ratio of the vehicle in combination with the oxygen content concentration in the exhaust gas; when the actual air-fuel ratio is less than or equal to the theoretical air-fuel ratio, the fuel injection amount of the vehicle's engine injector is adjusted according to the actual air-fuel ratio to reduce the temperature of the exhaust tail pipe in the exhaust line and reduce the risk of scalding for pedestrians near the exhaust tail pipe.

[0073] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0074] Figure 1 Schematic diagram of the vehicle control method provided in this application Figure 1 .like Figure 1 As shown, the method includes:

[0075] S101. Monitor a first exhaust temperature and a second exhaust temperature in an exhaust system of a vehicle, where the first exhaust temperature is the exhaust temperature before passing through a catalytic converter, and the second exhaust temperature is the exhaust temperature after passing through the catalytic converter.

[0076] In the vehicle exhaust system, monitoring the exhaust temperature is an important means of vehicle emission control. A catalytic converter is installed in the vehicle's exhaust pipe. The first exhaust temperature refers to the temperature before the exhaust gas enters the catalytic converter. Usually, the first exhaust temperature is higher because the first exhaust temperature comes directly from the engine's combustion chamber, and the engine combustion releases a lot of heat energy. The second exhaust temperature refers to the temperature of the exhaust gas after passing through the catalytic converter. The catalytic converter promotes the chemical reaction between the unburned components in the exhaust and oxygen. These reactions release energy, but after the exhaust passes through the catalytic converter, the energy will be partially absorbed and dissipated, so the second exhaust temperature will drop.

[0077] Therefore, it can be considered that under normal circumstances, the first exhaust temperature is higher than the second exhaust temperature. When the second exhaust temperature is greater than or equal to the first exhaust temperature, it can be proved that the exhaust system is abnormal, and step S102 is executed.

[0078] Optionally, a temperature collection component, such as a temperature sensor, is arranged before and after the catalytic converter in the exhaust pipe to collect the first exhaust temperature or the second exhaust temperature.

[0079] S102: If the second exhaust temperature is greater than or equal to the first exhaust temperature, obtain the oxygen content concentration in the exhaust gas.

[0080] In this step, it can be understood that when the second exhaust temperature is greater than or equal to the first exhaust temperature, it is necessary to obtain the oxygen content concentration in the exhaust gas, wherein the oxygen content concentration in the exhaust gas refers to the proportion of oxygen in the exhaust gas, which is a key indicator for evaluating the vehicle's air-fuel ratio.

[0081] S103: Determine the actual air-fuel ratio of the vehicle according to the oxygen content concentration.

[0082] After the oxygen content concentration is determined in S102, the actual air-fuel ratio of the vehicle needs to be determined based on the oxygen content concentration.

[0083] Optionally, the oxygen content concentration is collected by an oxygen sensor, and the actual air-fuel ratio of the exhaust system is determined based on the oxygen content concentration, including: determining a voltage value corresponding to the oxygen content concentration based on the oxygen content concentration; and determining the actual air-fuel ratio based on the voltage value.

[0084] Further, the actual air-fuel ratio is determined by:

[0085]

[0086] Among them, AFR represents the actual air-fuel ratio; U represents the voltage value corresponding to the oxygen content concentration; UE represents the reference voltage value; and R represents the response sensitivity of the oxygen sensor.

[0087] S104: If the actual air-fuel ratio is less than or equal to the theoretical air-fuel ratio, adjust the fuel injection amount of the engine injector of the vehicle according to the actual air-fuel ratio to reduce the temperature of the exhaust tail pipe in the exhaust line.

[0088] In this step, it can be understood that when the actual air-fuel ratio is less than or equal to the theoretical air-fuel ratio, the fuel injection amount of the vehicle's engine injector needs to be adjusted accordingly according to the actual air-fuel ratio, reducing the concentration of unburned components in the catalytic converter, reducing the chemical reaction heat inside the catalytic converter, and thus reducing the temperature of the exhaust tail pipe in the exhaust line. Among them, the engine injector is a switch solenoid valve, and its main function is to inject fuel into the cylinder or intake duct according to the needs of the whole vehicle.

[0089] In the embodiment of the present application, when the second exhaust temperature is greater than or equal to the first exhaust temperature, wherein the first exhaust temperature is the exhaust temperature before passing through the catalytic converter, and the second exhaust temperature is the exhaust temperature after passing through the catalytic converter, the second exhaust temperature is greater than or equal to the first exhaust temperature, indicating that the catalytic converter is processing an abnormal amount of oil, that is, an abnormality has occurred in the exhaust system. At this time, the actual air-fuel ratio of the vehicle is determined in combination with the oxygen content concentration in the exhaust gas; when the actual air-fuel ratio is less than or equal to the theoretical air-fuel ratio, the fuel injection amount of the vehicle's engine injector is adjusted according to the actual air-fuel ratio, so that the injected oil can be fully burned in the exhaust system, so as to reduce the temperature of the exhaust tail pipe in the exhaust line, and reduce the risk of scalding to pedestrians near the exhaust tail pipe.

[0090] On the basis of the above embodiment, the fuel injection amount of the vehicle's engine injector is adjusted according to the actual air-fuel ratio, including: based on the corresponding relationship between the air-fuel ratio and the fuel injection amount, according to the numerical range of the actual air-fuel ratio, determining the target fuel injection amount corresponding to the numerical range, the corresponding relationship characterizing the corresponding relationship between the numerical range of the air-fuel ratio and the fuel injection amount when the engine reaches the set combustion efficiency; adjusting the fuel injection amount of the vehicle's engine injector to the target fuel injection amount.

[0091] In this embodiment, it can be understood that when adjusting the fuel injection amount of the vehicle's engine injector, it is necessary to determine the target fuel injection amount corresponding to the numerical range based on the correspondence between the air-fuel ratio and the fuel injection amount according to the numerical range of the actual air-fuel ratio, and adjust the fuel injection amount of the vehicle's engine injector according to the target vehicle.

[0092] For example, when the actual air-fuel ratio is calculated to be 12:1, assuming that the intake air volume is a fixed value, such as 147 grams, the injection amount needs to be increased to about 12 grams.

[0093] The embodiment of the present application can improve the combustion efficiency of the engine by adjusting the injection amount of the vehicle's engine injector based on the corresponding relationship between the air-fuel ratio and the injection amount, thereby reducing the temperature of the exhaust tail pipe in the exhaust line and reducing the risk of scalding for pedestrians near the exhaust tail pipe.

[0094] On the basis of the above embodiment, after adjusting the injection amount of the vehicle's engine injector, it also includes: re-obtaining the oxygen content concentration in the exhaust gas; determining the vehicle's rich air-fuel ratio based on the re-obtained oxygen content concentration, the rich air-fuel ratio being the ratio of the current air-fuel ratio to the theoretical air-fuel ratio; if the rich air-fuel ratio is less than or equal to the ratio threshold, determining that the engine injector is faulty, and reporting the engine injector fault.

[0095] In this embodiment, it can be understood that after adjusting the injection amount of the vehicle's engine injector, the actual air-fuel ratio of the vehicle will change accordingly. Therefore, after adjusting the injection amount, it is necessary to re-acquire the oxygen content concentration in the exhaust gas. And according to the re-acquired oxygen content concentration, determine the vehicle's rich air-fuel ratio, wherein the rich air-fuel ratio is the ratio of the current air-fuel ratio to the theoretical air-fuel ratio. Compare the determined rich air-fuel ratio with the ratio threshold value. If the determined rich air-fuel ratio is less than or equal to the ratio threshold value, it can be confirmed that the engine injector has a fault, and the engine injector fault needs to be reported. The reporting method can be selected according to actual needs, such as outputting a reminder message through an audio broadcast module, the reminder message is used to inform the user that the engine injector has a fault, and remind the user to shut down the engine operation, and / or, by displaying a reminder message in the vehicle's dashboard, the reminder message is used to inform the user that the engine injector has a fault, and remind the user to shut down the engine operation.

[0096] Furthermore, the ratio threshold can be set according to actual conditions, for example, the ratio threshold is set to 0.9. Under this ratio threshold, it can be considered that when the rich air-fuel ratio is less than or equal to 0.9, the engine injector fault can be determined, and relevant information can be output to the user.

[0097] The embodiment of the present application determines the rich air-fuel ratio of the vehicle after adjusting the injection amount of the vehicle's engine injector, and compares the rich air-fuel ratio with a ratio threshold value to accurately determine whether the vehicle's engine injector is faulty.

[0098] Furthermore, after adjusting the fuel injection amount of the vehicle's engine injector, it also includes: recording the number of times the fuel injection amount is adjusted in the current control stage, and re-obtaining the oxygen content concentration in the exhaust gas; determining the vehicle's rich air-fuel ratio based on the re-obtained oxygen content concentration, the rich air-fuel ratio being the ratio of the current air-fuel ratio to the theoretical air-fuel ratio; if the rich air-fuel ratio is less than or equal to the ratio threshold, and the number of adjustments is less than the number threshold, continuing to adjust the fuel injection amount of the vehicle's engine injector; if the rich air-fuel ratio is less than or equal to the ratio threshold, and the number of adjustments reaches the number threshold, determining that the injector is faulty.

[0099] In this embodiment, it can be understood that after adjusting the injection amount of the vehicle's engine injector, it is necessary to record the number of times the injection amount is adjusted in the current control phase, and re-acquire the oxygen content concentration in the exhaust gas. Then, based on the re-acquired oxygen content concentration, the vehicle's rich air-fuel ratio is determined. The rich air-fuel ratio is the ratio of the current air-fuel ratio to the theoretical air-fuel ratio, and the method for determining the current air-fuel ratio has been described in detail in the above embodiment, so the embodiment of this application will not be repeated here.

[0100] Further, when the determined rich air-fuel ratio is less than or equal to the ratio threshold, and the number of adjustments is less than the number threshold, the fuel injection amount of the vehicle's engine injector continues to be adjusted; when the determined rich air-fuel ratio is less than or equal to the ratio threshold, and the number of adjustments is equal to the number threshold, the fuel injection amount of the vehicle's engine injector continues to be adjusted.

[0101] Furthermore, in this example, not only the rich air-fuel ratio needs to be determined, but also the number of times the fuel injection amount of the vehicle's engine injector is adjusted needs to be determined. Only when the rich air-fuel ratio and the number of adjustments meet the conditions can it be determined that the engine injector is faulty.

[0102] The embodiment of the present application introduces a judgment on the number of times of adjusting the injection amount of the engine injector when making a fault judgment on the engine injector, thereby reducing interference caused by problems that can be solved by adjusting the injection amount of the engine injector, and improving the accuracy of engine injector fault judgment.

[0103] On the basis of the above embodiment, an electronically controlled valve is provided in the exhaust tail pipe, and after determining that a fault exists in the engine injector, the method further includes: controlling the electronically controlled valve to close to isolate the air.

[0104] The schematic diagram of adding an electronically controlled valve to the exhaust tail pipe is as follows Figure 2 As shown, Figure 2 A schematic diagram of adding an electronically controlled valve to the exhaust tail pipe provided in the embodiment of the present application. Figure 2It can be seen that the exhaust tail pipe is divided into two sections with exhaust flanges, an electric control valve is installed in the middle, and sealing gaskets are installed in the middle of the flange surfaces at both ends, and each is connected by 9 pairs of bolts and nuts. The electric control valve is connected to the vehicle wiring harness through the wiring harness, and the opening and closing of the electric control valve is controlled by the high and low voltage signals of the vehicle.

[0105] Furthermore, after determining that the engine injector is faulty, the electronically controlled valve should be controlled to close to isolate the air and prevent the fuel in the exhaust pipe from burning.

[0106] Furthermore, Figure 2 In which, a represents exhaust tail pipe; b represents exhaust flange; c represents sealing gasket; d represents electric control valve; and e represents fixing bolt.

[0107] The embodiment of the present application can isolate the air by adding an electric-controlled valve in the exhaust tail pipe, thereby preventing the fuel in the exhaust pipe from burning and reducing the temperature of the exhaust tail pipe.

[0108] When the vehicle control method described in the above embodiment is applied to a hybrid vehicle, the vehicle control method further includes: when the battery power of the hybrid vehicle is greater than or equal to a power threshold, controlling the hybrid vehicle to switch from engine drive to motor drive.

[0109] In this embodiment, it can be understood that when applied to a hybrid vehicle, after determining that the engine injector is faulty, it is also necessary to determine whether the battery power of the hybrid vehicle is greater than the power threshold. When the battery power of the hybrid vehicle is greater than or equal to the power threshold, the hybrid vehicle is controlled to switch from engine drive to motor drive. The power threshold can be set according to actual conditions.

[0110] In one implementation, the power threshold is 30%. After determining that there is a fault in the engine injector, the battery power of the hybrid vehicle is 31%. At this time, the hybrid vehicle is controlled to switch from engine drive to electric motor drive.

[0111] It should be noted that when the vehicle is a non-hybrid vehicle, after confirming that the engine injector is faulty, it is necessary to report the relevant fault information and remind the user to shut down the engine, rather than shutting down the engine directly. Unless the vehicle is in a safe position, the engine can be shut down directly. In other words, when shutting down the engine directly, it is necessary to ensure that the vehicle is in a safe position and there will be no safety hazards after shutting down the engine.

[0112] In the embodiment of the present application, when the battery power of the hybrid vehicle is greater than or equal to the power threshold, the hybrid vehicle is controlled to switch from engine drive to electric motor drive, which can timely reduce the exhaust tail pipe temperature, thereby reducing the risk of scalding for pedestrians near the exhaust tail pipe.

[0113] Furthermore, the embodiment of the present application also provides an exhaust system for a vehicle, Figure 3 A schematic diagram of an exhaust system of a vehicle provided for the present application.

[0114] like Figure 3 As shown, a catalytic converter 301 is provided in the exhaust pipe of the exhaust system, and a temperature collection component 302 is provided before and after the catalytic converter; an oxygen content concentration collection component 303 is also provided in the exhaust pipe, wherein an electronic control unit 304 of the vehicle is connected to the temperature collection component and the oxygen content concentration collection component respectively, and the electronic control unit is used to execute the method described in the listed embodiment. Among them, the selection of the temperature collection component and the oxygen content concentration collection component can be carried out according to actual conditions, for example, the temperature collection component is set as a temperature sensor, and the oxygen content concentration collection component is set as a wide-range oxygen sensor.

[0115] Furthermore, an electric control valve is also provided in the exhaust tail pipe of the exhaust pipeline, and the electronic control unit is also used to control the opening of the electric control valve.

[0116] Next, an example will be given to illustrate how to use the vehicle control method provided in the embodiment of the present application, the method comprising the following steps:

[0117] 1. Temperature sensors are set before and after the catalytic converter. The temperature sensors are used to monitor the exhaust temperature before and after the catalytic converter and transmit the monitored exhaust temperature to the electronic control unit. The electronic control unit determines whether the exhaust temperature after the catalytic converter is higher than the exhaust temperature before the catalytic converter. When the exhaust temperature after the catalytic converter is higher than the exhaust temperature before the catalytic converter, the exhaust temperature abnormality is identified.

[0118] 2. The electronic control unit monitors the oxygen concentration in the exhaust gas through an oxygen sensor installed at one end of the catalytic converter;

[0119] 3. Convert the oxygen content concentration into air-fuel ratio. When the calculated air-fuel ratio is less than the theoretical air-fuel ratio, adjust the air-fuel ratio by controlling the injection amount of the engine injector;

[0120] 4. In the process of adjusting the air-fuel ratio, the number of times the fuel injection amount of the engine injector is controlled and / or the time of controlling the fuel injection amount of the engine injector is recorded, and when the number and / or time meet the termination control condition, and the ratio of the current air-fuel ratio to the theoretical air-fuel ratio (rich air-fuel ratio) is still less than or equal to the ratio threshold, it is determined that the engine injector has a fault; for example, when the number is equal to 3 and / or the time is equal to 30s, and the ratio of the current air-fuel ratio to the theoretical air-fuel ratio is still less than or equal to 0.9, it is determined that the engine injector has a fault;

[0121] 5. After determining that there is a fault in the injection amount of the engine injector, report a reminder message of the engine injector fault, and the reminder message is used to remind the user to shut down the engine; when applied to a hybrid vehicle, when the battery power of the hybrid vehicle is greater than or equal to the power threshold, control the hybrid vehicle to switch from engine drive to motor drive, for example, when the battery power of the hybrid vehicle is greater than or equal to 30%, control the hybrid vehicle to switch from engine drive to motor drive;

[0122] 6. Add an electronically controlled valve to the exhaust tail pipe. After reporting an engine injector fault and / or shutting down the engine, close the electronically controlled valve to isolate the air.

[0123] One point that needs to be explained is that when determining the rich air-fuel ratio of the vehicle, it is still necessary to do so when the second exhaust temperature is greater than or equal to the first exhaust temperature.

[0124] In summary, the embodiment of the present application identifies the exhaust temperature before and after the catalytic converter, monitors the exhaust oxygen concentration, and determines the actual air-fuel ratio of the vehicle according to the oxygen concentration. When the actual air-fuel ratio is less than or equal to the theoretical air-fuel ratio, the injection amount of the vehicle's engine injector is adjusted according to the actual air-fuel ratio to reduce the temperature of the exhaust tail pipe in the exhaust line.

[0125] Furthermore, after adjusting the injection amount of the vehicle's engine injector, it is necessary to re-acquire the oxygen content concentration, and determine the vehicle's rich air-fuel ratio based on the re-acquired oxygen content concentration. When the vehicle's rich air-fuel ratio is less than or equal to the ratio threshold, it can be determined that the engine injector is faulty and leaking. Through the above monitoring and control method, the problem can be accurately identified with higher accuracy.

[0126] Furthermore, the vehicle control method provided in the embodiment of the present application can avoid long injection caused by the jamming of the engine injector and dripping when the engine injector seal is corroded, which causes incomplete combustion and the fuel enters the exhaust pipe with the exhaust gas and burns, making the exhaust tail pipe temperature too high, causing harm to pedestrians around.

[0127] One thing that needs to be explained is that the embodiment of the present application controls the injection amount of the engine injector through the exhaust oxygen content concentration, does not need to increase the cost of parts, and has no impact on the vehicle's own structure and software control; the exhaust tail pipe adds an electronically controlled valve with a simple structure and has no impact on the engine compartment layout.

[0128] The following is an embodiment of the device of the present application, which can be used to execute the embodiment of the method of the present application. For details not disclosed in the embodiment of the device of the present application, please refer to the embodiment of the method of the present application.

[0129] Figure 4 This is a schematic diagram of the structure of the vehicle control device provided in the embodiment of the present application. Figure 4As shown, the vehicle control device 400 provided in this embodiment includes:

[0130] A monitoring module 401, for monitoring a first exhaust temperature and a second exhaust temperature in an exhaust system of a vehicle, wherein the first exhaust temperature is the exhaust temperature before passing through a catalytic converter, and the second exhaust temperature is the exhaust temperature after passing through the catalytic converter;

[0131] An acquisition module 402 is used to acquire the oxygen content concentration in the exhaust gas if the second exhaust gas temperature is greater than or equal to the first exhaust gas temperature;

[0132] A determination module 403 is used to determine the actual air-fuel ratio of the vehicle according to the oxygen content concentration;

[0133] The adjustment module 404 is used to adjust the injection amount of the engine injector of the vehicle according to the actual air-fuel ratio to reduce the temperature of the exhaust tail pipe in the exhaust line if the actual air-fuel ratio is less than or equal to the theoretical air-fuel ratio.

[0134] In a possible implementation, the adjustment module 404 is specifically configured to:

[0135] Based on the correspondence between the air-fuel ratio and the fuel injection amount, according to the numerical range of the actual air-fuel ratio, the target fuel injection amount corresponding to the numerical range is determined, and the correspondence relationship represents the correspondence between the numerical range of the air-fuel ratio and the fuel injection amount when the engine reaches the set combustion efficiency;

[0136] The fuel injection amount of the vehicle's engine injector is adjusted to a target fuel injection amount.

[0137] In a possible implementation manner, the determination module 403 is specifically configured to:

[0138] Re-obtaining the oxygen content concentration in the exhaust gas;

[0139] Determine the rich air-fuel ratio of the vehicle according to the re-acquired oxygen content concentration, where the rich air-fuel ratio is the ratio of the current air-fuel ratio to the theoretical air-fuel ratio;

[0140] If the rich air-fuel ratio is less than or equal to the ratio threshold, it is determined that the engine injector is faulty and the engine injector fault is reported.

[0141] In a possible implementation manner, the determination module 403 is specifically configured to:

[0142] Record the number of times the injection amount is adjusted during the current control phase, and re-obtain the oxygen content concentration in the exhaust gas;

[0143] Determine the rich air-fuel ratio of the vehicle according to the re-acquired oxygen content concentration, where the rich air-fuel ratio is the ratio of the current air-fuel ratio to the theoretical air-fuel ratio;

[0144] If the rich air-fuel ratio is less than or equal to the ratio threshold, and the number of adjustments is less than the number threshold, continue to adjust the injection amount of the vehicle's engine injector;

[0145] If the rich air-fuel ratio is less than or equal to the ratio threshold, and the number of adjustments reaches the number threshold, it is determined that the injector is faulty.

[0146] In a possible implementation, an electronically controlled valve is provided in the exhaust tail pipe, and the vehicle control device further includes a processing module (not shown), which is specifically used for:

[0147] Control the electric control valve to close to isolate the air.

[0148] In a possible implementation manner, applied to a hybrid vehicle, the processing module is further used for:

[0149] When the battery power of the hybrid vehicle is greater than or equal to the power threshold, the hybrid vehicle is controlled to switch from engine drive to electric motor drive.

[0150] In a possible implementation manner, the oxygen content concentration is collected by an oxygen sensor, and the determination module 403 is specifically used to:

[0151] According to the oxygen content concentration, determining a voltage value corresponding to the oxygen content concentration;

[0152] Based on the voltage value, the actual air-fuel ratio is determined.

[0153] The vehicle control device provided in this embodiment can execute the method provided in the above method embodiment. Its implementation principle and technical effect are similar, and will not be described in detail in this embodiment.

[0154] It should be noted that it should be understood that the division of the various modules of the above device is only a division of logical functions. In actual implementation, they can be fully or partially integrated into one physical entity, or they can be physically separated. And these modules can all be implemented in the form of software called by processing elements; they can also be all implemented in the form of hardware; some modules can also be implemented in the form of software called by processing elements, and some modules can be implemented in the form of hardware. For example, the processing module can be a separately established processing element, or it can be integrated in a chip of the above device. In addition, it can also be stored in the memory of the above device in the form of program code, and called and executed by a processing element of the above device. The implementation of other modules is similar. In addition, these modules can be fully or partially integrated together, or they can be implemented independently. The processing element here can be an integrated circuit with signal processing capabilities. In the implementation process, each step of the above method or each module above can be completed by an integrated logic circuit of hardware in the processor element or instructions in the form of software.

[0155] For example, the above modules may be one or more integrated circuits configured to implement the above methods, such as one or more application specific integrated circuits (ASIC), or one or more microprocessors (DSP), or one or more field programmable gate arrays (FPGA). For another example, when a module above is implemented in the form of a processing element scheduling program code, the processing element may be a general-purpose processor, such as a central processing unit (CPU) or other processor that can call program code. For another example, these modules may be integrated together and implemented in the form of a system-on-a-chip (SOC).

[0156] Figure 5 This is a schematic diagram of the structure of an electronic device provided by an embodiment of the present application. Figure 5 As shown, the electronic device 500 provided in the embodiment of the present application may include: a processor 501, and a memory 502 connected to the processor in communication, wherein:

[0157] Memory stores computer-executable instructions;

[0158] The processor executes the computer-executable instructions stored in the memory to implement the method described in the foregoing method embodiment.

[0159] It should be understood that the processor 501 can be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), etc. The general-purpose processor can be a microprocessor or the processor can be any conventional processor, etc. The steps of the method disclosed in the application can be directly embodied as being executed by a hardware processor, or can be executed by a combination of hardware and software modules in the processor. The memory 502 may include a high-speed random access memory (RAM), and may also include non-volatile storage NVM (non-volatile memory), such as at least one disk storage, and can also be a USB flash drive, a mobile hard disk, a read-only memory, a disk or an optical disk, etc.

[0160] Optionally, the electronic device 500 may further include a communication interface 503. In a specific implementation, if the communication interface 503, the memory 502 and the processor 501 are implemented independently, the communication interface 503, the memory 502 and the processor 501 may be interconnected through a bus and communicate with each other. The bus may be an Industry Standard Architecture (ISA) bus, a Peripheral Component (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc., but it does not mean that there is only one bus or one type of bus.

[0161] Optionally, in a specific implementation, if the communication interface 503, the memory 502 and the processor 501 are integrated on a chip, the communication interface 503, the memory 502 and the processor 501 can communicate through an internal interface.

[0162] An embodiment of the present application also provides a computer-readable storage medium, in which computer-executable instructions are stored. When the computer-executable instructions are executed, they are used to implement the method described in any of the aforementioned embodiments.

[0163] It is understood that the computer-readable storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read only memory (EEPROM), erasable programmable read only memory (EPROM), programmable read only memory (PROM), read only memory (ROM), magnetic storage, flash memory, magnetic disk or optical disk. The readable storage medium can be any available medium that can be accessed by a general or special-purpose computer.

[0164] An exemplary computer-readable storage medium is coupled to a processor so that the processor can read information from the computer-readable storage medium and write information to the computer-readable storage medium. Of course, the computer-readable storage medium can also be an integral part of the processor. The processor and the computer-readable storage medium can be located in an ASIC. Of course, the processor and the computer-readable storage medium can also exist in an electronic device as discrete components.

[0165] The above-mentioned integrated module implemented in the form of a software function module can be stored in a computer-readable storage medium. The above-mentioned software function module is stored in a computer-readable storage medium, including a number of instructions for enabling an electronic device (which can be a personal computer, a server, or a network device, etc.) or a processor to perform some steps of the method described in each embodiment of the present application.

[0166] An embodiment of the present application also provides a computer program product, including a computer program, which implements the method described in any of the above embodiments when executed.

[0167] It should be noted that, for the aforementioned method embodiments, for the sake of simplicity, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the present application is not limited by the described order of actions, because according to the present application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily required by the present application.

[0168] It should be further noted that, although the various steps in the flowchart are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless there is a clear description in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least a portion of the steps in the flowchart may include multiple sub-steps or multiple stages, and these sub-steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these sub-steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.

[0169] In the above embodiments, the description of each embodiment has its own emphasis. For the part not described in detail in a certain embodiment, please refer to the relevant description of other embodiments. The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0170] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0171] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A vehicle control method, characterized in that: A catalytic converter is provided in an exhaust pipe of a vehicle, and the vehicle control method comprises: Monitoring a first exhaust temperature and a second exhaust temperature in an exhaust system of a vehicle, wherein the first exhaust temperature is the exhaust temperature before passing through the catalytic converter, and the second exhaust temperature is the exhaust temperature after passing through the catalytic converter; If the second exhaust gas temperature is greater than or equal to the first exhaust gas temperature, obtaining the oxygen content concentration in the exhaust gas; determining an actual air-fuel ratio of the vehicle according to the oxygen content concentration; If the actual air-fuel ratio is less than or equal to the theoretical air-fuel ratio, the fuel injection amount of the engine injector of the vehicle is adjusted according to the actual air-fuel ratio to reduce the temperature of the exhaust tail pipe in the exhaust line.

2. The method according to claim 1, characterized in that: The step of adjusting the fuel injection amount of the engine injector of the vehicle according to the actual air-fuel ratio comprises: Based on the correspondence between the air-fuel ratio and the fuel injection amount, according to the numerical range of the actual air-fuel ratio, determining the target fuel injection amount corresponding to the numerical range, wherein the correspondence represents the correspondence between the numerical range of the air-fuel ratio and the fuel injection amount when the engine reaches a set combustion efficiency; The fuel injection amount of the engine injector of the vehicle is adjusted to the target fuel injection amount.

3. The method according to claim 1 or 2, characterized in that: After adjusting the fuel injection amount of the engine fuel injector of the vehicle, the method further includes: Re-obtaining the oxygen content concentration in the exhaust gas; Determining a rich air-fuel ratio of the vehicle according to the reacquired oxygen content concentration, wherein the rich air-fuel ratio is a ratio of a current air-fuel ratio to a theoretical air-fuel ratio; If the rich air-fuel ratio is less than or equal to the ratio threshold, it is determined that the engine injector is faulty and the engine injector fault is reported.

4. The method according to claim 1 or 2, characterized in that: After adjusting the fuel injection amount of the engine fuel injector of the vehicle, the method further includes: Record the number of times the injection amount is adjusted during the current control phase, and re-obtain the oxygen content concentration in the exhaust gas; Determining a rich air-fuel ratio of the vehicle according to the reacquired oxygen content concentration, wherein the rich air-fuel ratio is a ratio of a current air-fuel ratio to a theoretical air-fuel ratio; If the rich air-fuel ratio is less than or equal to the ratio threshold, and the number of adjustments is less than the number threshold, continue to adjust the injection amount of the engine injector of the vehicle; If the rich air-fuel ratio is less than or equal to the ratio threshold, and the number of adjustments reaches the number threshold, it is determined that the injector is faulty.

5. The method according to claim 3, characterized in that: The exhaust tail pipe is provided with an electronically controlled valve, and after determining that the engine injector is faulty, the method further comprises: The electric control valve is controlled to be closed to isolate the air.

6. The method according to claim 5, characterized in that Applied to a hybrid vehicle, the method further comprises: When the battery power of the hybrid vehicle is greater than or equal to a power threshold, the hybrid vehicle is controlled to switch from being driven by an engine to being driven by an electric motor.

7. The method according to claim 1 or 2, characterized in that: The oxygen content concentration is collected by an oxygen sensor, and the actual air-fuel ratio of the exhaust system is determined according to the oxygen content concentration, including: According to the oxygen content concentration, determining a voltage value corresponding to the oxygen content concentration; Based on the voltage value, the actual air-fuel ratio is determined.

8. An exhaust system for a vehicle, characterized in that: A catalytic converter is provided in the exhaust pipe of the exhaust system, and temperature collection components are provided before and after the catalytic converter; an oxygen content concentration collection component is also provided in the exhaust pipe, wherein the electronic control unit of the vehicle is respectively connected to the temperature collection component and the oxygen content concentration collection component, and the electronic control unit is used to execute the method as described in any one of claims 1 to 7.

9. The exhaust system according to claim 8, characterized in that An electric control valve is also provided in the exhaust tail pipe of the exhaust pipeline, and the electronic control unit is also used to control the opening of the electric control valve.

10. A vehicle control device, characterized in that: A catalytic converter is provided in the exhaust pipe of the vehicle, and the vehicle control device comprises: A monitoring module, used to monitor a first exhaust temperature and a second exhaust temperature in an exhaust system of a vehicle, wherein the first exhaust temperature is the exhaust temperature before passing through the catalytic converter, and the second exhaust temperature is the exhaust temperature after passing through the catalytic converter; an acquisition module, configured to acquire the oxygen content concentration in the exhaust gas if the second exhaust gas temperature is greater than or equal to the first exhaust gas temperature; a determination module, configured to determine an actual air-fuel ratio of the vehicle according to the oxygen content concentration; The adjustment module is used to adjust the injection amount of the engine injector of the vehicle according to the actual air-fuel ratio if the actual air-fuel ratio is less than or equal to the theoretical air-fuel ratio, so as to reduce the temperature of the exhaust tail pipe in the exhaust line.

11. An electronic device, characterized in that: include: Memory, processor; The memory stores computer-executable instructions; The processor executes the computer-executable instructions stored in the memory, so that the processor performs the method according to any one of claims 1 to 7.

12. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions, which are used to implement the method according to any one of claims 1 to 7 when executed.

13. A computer program product, characterized in that The invention comprises a computer program, which implements the method according to any one of claims 1 to 7 when being executed.

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