Control and diagnosis system and method for throttle valve of automobile engine

Abstract

The invention discloses an automobile engine throttle valve control and diagnosis system and method, and particularly relates to the technical field of automobile engine throttle valve control. The control method comprises the steps that engine operation parameters are obtained in real time, the target throttle valve pressure ratio is calculated through a speed density method, the target throttle valve opening degree is obtained in combination with related parameters, and an actuator is controlled to conduct adjustment; the diagnosis method comprises the steps of monitoring throttle valve operation state parameters, setting a normal range and comparing and judging faults. The system comprises a data acquisition module, a control calculation module, an execution module and a diagnosis module. The opening degree of the throttle valve can be accurately controlled, the combustion efficiency of the engine is optimized, the fuel economy is improved, and emission is reduced; throttle valve faults can be timely and accurately diagnosed, fault codes are recorded, protection measures are taken, the operation reliability and safety of the engine are improved, all the modules work cooperatively, and the overall operation efficiency of the system is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive engine throttle control, and more specifically, to an automotive engine throttle control and diagnosis system and method. Background Art

[0002] During the operation of an automotive engine, the throttle valve, as a key component for controlling the intake air volume, has a crucial impact on the performance, fuel economy, and emission levels of the engine. With the continuous development of automotive technology, the requirements for engine throttle control and diagnosis systems are also getting higher and higher.

[0003] Currently, when calculating the target throttle valve opening in some traditional throttle control methods, often only rely on a single or a few parameters, and fail to comprehensively consider the actual operating conditions of the engine. This results in an inability to accurately control the throttle valve opening under different conditions such as engine speed and load, and thus the matching of engine intake air volume and fuel volume is not ideal. For example, during engine acceleration or deceleration, due to insufficient control accuracy, the fuel combustion is likely to be incomplete, which not only increases fuel consumption but also causes the emission of harmful substances in the exhaust gas to exceed the standard, polluting the environment.

[0004] In terms of diagnosis, the existing throttle valve diagnosis systems have certain limitations. Some diagnosis systems can only detect some obvious faults, and it is difficult to detect and accurately judge some subtle faults, such as slight abnormal fluctuations in the throttle valve position sensor signal, or potential faults of the throttle valve actuator within the normal operating current range but close to the limit value. This makes it impossible to handle potential problems of the engine in a timely manner, which may further lead to more serious faults, affecting the normal operation of the engine and even endangering driving safety.

[0005] In addition, traditional throttle control and diagnosis systems are often independent of each other and lack an effective collaborative working mechanism. When the control module adjusts the throttle valve opening, it cannot make full use of the information provided by the diagnosis module for optimization; while the diagnosis module fails to achieve real-time data sharing and interaction with the control module during fault detection. This functional separation reduces the operating efficiency of the entire system and increases the difficulty of fault troubleshooting and repair.

[0006] In summary, the existing automotive engine throttle control and diagnosis technologies have problems such as insufficient control accuracy, limited diagnostic capabilities, and poor system coordination, and are difficult to meet the development needs of modern automotive engines for high efficiency, environmental protection, and safety. Therefore, it is of great practical significance to develop a new type of automotive engine throttle control and diagnosis system and method that can accurately control the throttle valve opening, effectively diagnose faults, and achieve system collaborative work. Summary of the Invention

[0007] To overcome the above-mentioned defects of the prior art, the present invention provides an automotive engine throttle control and diagnosis system and method to solve the problems raised in the above-mentioned background art.

[0008] To achieve the above object, the present invention provides the following technical solutions: An automotive engine throttle control method, comprising the following steps: Obtain the operating parameters of the engine in real time, including but not limited to engine speed, intake pressure, upstream throttle pressure, target intake manifold pressure, and target flow rate; Calculate the target throttle pressure ratio using the speed-density method based on the operating parameters; Calculate the target throttle opening based on the target throttle pressure ratio, in combination with parameters such as throttle flow rate and intake pressure; Control the throttle actuator to adjust the throttle opening to the target throttle opening.

[0009] Preferably, the calculating the target throttle pressure ratio using the speed-density method based on the operating parameters specifically includes: When the engine is in the stopped state, the target throttle pressure ratio is a fixed value; When the engine is in the running state, calculate the target throttle pressure ratio based on parameters such as intake pressure and upstream throttle pressure, and limit its maximum value.

[0010] Preferably, during the process of calculating the target throttle opening, factors such as the flow characteristics of the throttle, intake pressure, and target throttle pressure ratio are considered, and the calculation is performed through a specific mathematical model.

[0011] Preferably, it also includes real-time monitoring and feedback adjustment of the target throttle opening. If the deviation between the actual throttle opening and the target throttle opening exceeds a preset threshold, the control signal is adjusted to reduce the deviation.

[0012] An automotive engine throttle diagnosis method, comprising the following steps: Continuously monitor the operating state parameters of the throttle, including throttle opening, throttle position sensor signal, and throttle actuator current; Set the normal range of each operating state parameter; Compare the real-time monitored operating state parameters with the normal range to determine whether there is a fault in the throttle.

[0013] Preferably, if it is monitored that the throttle opening exceeds the normal range and the duration exceeds a preset time, it is determined that there is an abnormal throttle opening fault.

[0014] Preferably, if there are abnormal fluctuations in the throttle position sensor signal or it does not match the throttle opening, it is determined that there is a fault in the throttle position sensor.

[0015] Preferably, if the throttle actuator current exceeds the normal operating current range, it is determined that the throttle actuator is faulty.

[0016] An automotive engine throttle control and diagnosis system, comprising: A data acquisition module for real-time acquisition of the operating parameters of the engine and the operating state parameters of the throttle.

[0017] A control calculation module, which calculates the target throttle pressure ratio using the speed density method based on the acquired engine operating parameters, and further calculates the target throttle opening.

[0018] An execution module that receives the target throttle opening signal output by the control calculation module and controls the throttle actuator to adjust the throttle opening to the target opening.

[0019] A diagnosis module continuously monitors the operating state parameters of the throttle, compares them with the set normal range, determines whether there is a fault in the throttle, and outputs a fault diagnosis result.

[0020] Preferably, the data acquisition module includes an engine speed sensor, an intake pressure sensor, a throttle upstream pressure sensor, a throttle position sensor, and a throttle actuator current sensor.

[0021] The technical effects and advantages of the present invention: 1. By real-time acquisition of multiple engine parameters, calculating the target throttle pressure ratio using the speed density method, and calculating the target throttle opening in combination with parameters such as throttle flow, the throttle opening can be accurately controlled. This control method fully considers the intake requirements of the engine under different operating conditions. Compared with traditional control methods, it can more precisely adjust the intake air volume, optimize the engine combustion efficiency, improve fuel economy, reduce exhaust emissions, so that at different engine speeds and loads, the throttle opening can be accurately adjusted to ensure a reasonable match between the air volume and fuel volume entering the engine, making the combustion more complete.

[0022] 2. By continuously monitoring the operating state parameters of the throttle and comparing them with the preset normal range, various faults can be detected in a timely manner. When abnormal throttle opening, abnormal position sensor signal, or abnormal actuator current is detected, the fault type can be quickly determined. Compared with the prior art, it can diagnose throttle faults more comprehensively and accurately, record fault codes in a timely manner and trigger corresponding measures, such as restricting the engine power output, to avoid engine damage or performance degradation caused by throttle faults, improving the reliability and safety of engine operation.

[0023] 3. By closely cooperating with each module of the automotive engine throttle control and diagnosis system, the data acquisition module provides accurate data. The control calculation module calculates the target opening based on this, the execution module precisely adjusts the throttle, and the diagnosis module monitors faults in real time, achieving collaborative work between control and diagnosis. Compared with some existing systems with separated functions and poor coordination, the present invention improves the overall operation efficiency of the system, reduces the probability of faults, and enhances the comprehensive performance of the automotive engine. Detailed implementation mode

[0024] Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention.

[0025] The automotive engine throttle control method provided by the present invention includes the following steps: Obtain the operating parameters of the engine in real time, including but not limited to engine speed, intake pressure, throttle upstream pressure, target intake pipe pressure, and target flow rate; Calculate the target throttle pressure ratio using the speed density method according to the operating parameters; Calculate the target throttle opening based on the target throttle pressure ratio in combination with parameters such as throttle flow rate and intake pressure; Control the throttle actuator to adjust the throttle opening to the target throttle opening.

[0026] The calculation of the target throttle pressure ratio using the speed density method according to the operating parameters specifically includes: When the engine is in a stopped state, the target throttle pressure ratio is a fixed value; When the engine is in an operating state, calculate the target throttle pressure ratio according to parameters such as intake pressure and throttle upstream pressure, and limit its maximum value.

[0027] In the process of calculating the target throttle opening, factors such as the flow characteristics of the throttle, intake pressure, and target throttle pressure ratio are considered, and the calculation is carried out through a specific mathematical model.

[0028] It also includes real-time monitoring and feedback adjustment of the target throttle opening. If the deviation between the actual throttle opening and the target throttle opening exceeds a preset threshold, adjust the control signal to reduce the deviation.

[0029] During specific implementation, obtain the engine speed information in real time through an engine speed sensor.

[0030] Measure the intake pressure and throttle upstream pressure respectively using an intake pressure sensor and a throttle upstream pressure sensor.

[0031] Obtain parameters such as the target intake manifold pressure and target flow rate from the engine control unit (ECU).

[0032] Calculation of the target throttle pressure ratio When the engine is in the stopped state, directly set the target throttle pressure ratio to a fixed value.

[0033] When the engine is in the running state, calculate the target throttle pressure ratio according to the parameters such as intake pressure and upstream throttle pressure in the following steps: First, preliminarily calculate a throttle pressure ratio value based on factors such as the difference between the intake pressure and the upstream throttle pressure.

[0034] Then, limit the maximum value of this numerical value to obtain the target throttle pressure ratio.

[0035] Calculation of the target throttle opening Combined with parameters such as the target throttle pressure ratio, throttle flow rate, and intake pressure, use a pre-established mathematical model to calculate the target throttle opening. This mathematical model takes into account the flow characteristics of the throttle to ensure that the calculated target throttle opening can meet the intake requirements of the engine.

[0036] Adjustment of the throttle opening The control calculation module sends the calculated target throttle opening signal to the execution module.

[0037] The execution module controls the action of the throttle actuator according to the received signal to adjust the throttle opening to the target opening.

[0038] Real-time monitoring and feedback regulation During the adjustment of the throttle opening, continuously monitor the actual throttle opening.

[0039] Compare the actual throttle opening with the target throttle opening. If the deviation between the two exceeds the preset threshold (such as ±5%), then adjust the control signal to make the throttle opening gradually approach the target opening.

[0040] A method for diagnosing the throttle of an automotive engine provided by the present invention includes the following steps: Continuously monitor the operating state parameters of the throttle, including the throttle opening, throttle position sensor signal, and throttle actuator current; Set the normal range of each operating state parameter; Compare the real-time monitored operating state parameters with the normal range to determine whether there is a fault in the throttle.

[0041] If it is monitored that the throttle opening exceeds the normal range and the duration exceeds the preset time, then determine that there is an abnormal throttle opening fault.

[0042] If the throttle position sensor signal shows abnormal fluctuations or does not match the throttle opening, it is determined that the throttle position sensor is faulty.

[0043] If the throttle actuator current exceeds the normal operating current range, it is determined that the throttle actuator is faulty.

[0044] During specific implementation, the throttle position sensor is used to monitor the throttle opening in real time.

[0045] Monitor the signal output by the throttle position sensor and check whether it is stable and accurate.

[0046] Monitor the operating current of the throttle actuator through a current sensor.

[0047] According to the design parameters of the engine and the experimental test data, set the normal ranges of parameters such as the throttle opening, the throttle position sensor signal, and the throttle actuator current. For example, the normal range of the throttle opening is 0 - 100%, the normal fluctuation range of the throttle position sensor signal is ±0.5V, and the normal operating range of the throttle actuator current is 0 - 5A.

[0048] If it is monitored that the throttle opening exceeds the normal range and the duration exceeds the preset time (such as 5 seconds), it is determined that there is an abnormal throttle opening fault. At this time, the system will record the fault code and may trigger the fault indicator light to turn on.

[0049] If the throttle position sensor signal shows abnormal fluctuations or does not match the throttle opening, it is determined that the throttle position sensor is faulty. The system will perform further diagnosis, such as checking whether the connection wires of the sensor are loose or damaged.

[0050] If the throttle actuator current exceeds the normal operating current range, it is determined that the throttle actuator is faulty. The system will attempt to adjust the control signal. If the fault still exists, it may be necessary to replace the throttle actuator.

[0051] An automotive engine throttle control and diagnosis system provided by the present invention includes: A data acquisition module for obtaining the operating parameters of the engine and the operating state parameters of the throttle in real time.

[0052] A control calculation module that calculates the target throttle pressure ratio using the speed density method based on the collected engine operating parameters, and further calculates the target throttle opening.

[0053] An execution module that receives the target throttle opening signal output by the control calculation module and controls the throttle actuator to adjust the throttle opening to the target opening.

[0054] The diagnostic module continuously monitors the operating state parameters of the throttle valve, compares them with the set normal range, determines whether there is a fault in the throttle valve, and outputs the fault diagnosis result.

[0055] The data acquisition module includes an engine speed sensor, an intake pressure sensor, an upstream pressure sensor of the throttle valve, a throttle position sensor, and a throttle actuator current sensor.

[0056] During specific implementation, for the data acquisition module: each sensor sends the acquired engine operating parameters and throttle valve operating state parameters to the control calculation module and the diagnostic module.

[0057] The data acquisition module ensures the accuracy and reliability of the acquired data, providing a basis for subsequent control and diagnosis.

[0058] The control calculation module: receives the engine operating parameters transmitted by the data acquisition module, calculates according to the steps of the above throttle valve control method, and obtains the target throttle valve opening.

[0059] Sends the target throttle valve opening signal to the execution module.

[0060] The execution module: receives the target throttle valve opening signal, controls the action of the throttle actuator, and realizes the adjustment of the throttle valve opening.

[0061] The execution module has a certain response speed and accuracy, ensuring that the throttle valve opening can be quickly and accurately adjusted to the target value.

[0062] The diagnostic module: continuously receives the throttle valve operating state parameters transmitted by the data acquisition module, and conducts fault judgment according to the steps of the above throttle valve diagnosis method.

[0063] If a fault is detected, the fault diagnosis result is fed back to the engine control unit (ECU), and corresponding protection measures may be taken, such as restricting the engine power output, etc.

[0064] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for controlling the throttle of an automotive engine, characterized in that, It includes the following steps: Obtain the operating parameters of the engine in real time, including but not limited to engine speed, intake pressure, upstream throttle pressure, target intake manifold pressure, and target flow rate; Calculate the target throttle pressure ratio using the speed-density method based on the operating parameters; Calculate the target throttle opening based on the target throttle pressure ratio, combined with parameters such as throttle flow rate and intake pressure; Control the throttle actuator to adjust the throttle opening to the target throttle opening.

2. The method for controlling an automotive engine throttle according to claim 1, characterized in that, The calculating the target throttle pressure ratio using the speed-density method based on the operating parameters specifically includes: When the engine is in a stopped state, the target throttle pressure ratio is a fixed value; When the engine is in an operating state, calculate the target throttle pressure ratio based on parameters such as intake pressure and upstream throttle pressure, and limit its maximum value.

3. The method for controlling the throttle of an automotive engine according to claim 1, characterized in that, During the process of calculating the target throttle opening, factors such as the flow characteristics of the throttle, intake pressure, and target throttle pressure ratio are considered, and calculations are performed through a specific mathematical model.

4. The method for controlling the throttle of an automotive engine according to claim 1, characterized in that, It also includes real-time monitoring and feedback adjustment of the target throttle opening. If the deviation between the actual throttle opening and the target throttle opening exceeds a preset threshold, adjust the control signal to reduce the deviation.

5. A method for diagnosing a throttle valve of an automotive engine, characterized in that, It includes the following steps: Continuously monitor the operating state parameters of the throttle, including throttle opening, throttle position sensor signal, and throttle actuator current; Set the normal ranges of the operating state parameters; Compare the real-time monitored operating state parameters with the normal ranges to determine whether there is a fault in the throttle.

6. The automotive engine throttle diagnosis method according to claim 5, wherein, If it is monitored that the throttle opening exceeds the normal range and the duration exceeds the preset time, determine that there is an abnormal throttle opening fault.

7. The automotive engine throttle diagnosis method according to claim 5, characterized in that If the throttle position sensor signal shows abnormal fluctuations or does not match the throttle opening, determine that there is a throttle position sensor fault.

8. The method for diagnosing an automotive engine throttle according to claim 5, characterized in that, If the throttle actuator current exceeds the normal operating current range, determine that there is a throttle actuator fault.

9. An automotive engine throttle control and diagnosis system, characterized in that, It includes: A data acquisition module for obtaining the operating parameters of the engine and the operating state parameters of the throttle in real time; A control calculation module that calculates the target throttle pressure ratio using the speed-density method based on the acquired engine operating parameters and further calculates the target throttle opening; An execution module that receives the target throttle opening signal output by the control calculation module and controls the throttle actuator to adjust the throttle opening to the target opening; A diagnosis module that continuously monitors the operating state parameters of the throttle, compares them with the set normal ranges, determines whether there is a fault in the throttle, and outputs a fault diagnosis result.

10. The automotive engine throttle control and diagnosis system according to claim 9, characterized in that, The data acquisition module includes an engine speed sensor, an intake pressure sensor, an upstream throttle pressure sensor, a throttle position sensor, and a throttle actuator current sensor.