CN202394438U - Teaching equipment for automobile engine electric control system training - Google Patents

Abstract

The utility model discloses a practical training and teaching equipment for an electric control system of an automobile engine. The equipment includes an external panel C, a signal transfer device A, a fault setting system B and a group of measuring points consistent with the actual work and maintenance positions, and can test out The signal transfer device A of the electronic control component signal under the actual working condition of the vehicle is connected to the engine ECU; the fault setting system B simulates the fault signals of the coolant temperature sensor and the fuel injector, and transmits the fault signal to the engine ECU; The external panel C is connected with the signal transfer device A. The utility model does not damage the engine body and prolongs the working life of the engine used for training; it can simulate a variety of fault states to ensure the authenticity and concealment of fault settings; and it improves the work efficiency of students' practical training and skill assessment.

Description

A practical training and teaching equipment for automobile engine electronic control system

technical field

The utility model relates to a teaching device, in particular to a teaching device for practical training of an electric control system of an automobile engine used for teaching.

Background technique

Practical teaching is an important way to cultivate students' professional ethics, professional skills and employment and entrepreneurial ability. It can best reflect the application-oriented characteristics of higher vocational personnel training and is one of the core contents of the connotation construction in the development of higher vocational education. With the rapid development of higher vocational education, the demand for training equipment in schools has also greatly increased.

The structure, working principle, detection and troubleshooting methods of electronically controlled engine sensors and actuators are the key and difficult points in the teaching of automobile majors. The electronically controlled engine system training teaching equipment can combine theoretical teaching with practical teaching, so that students' learning process is close to the actual working process, which is conducive to the improvement of students' comprehensive quality.

At present, most of the electronically controlled engine benches used in various schools are manufactured by teaching equipment factories, and there are the following problems:

1. The platform is based on a single engine assembly, supplemented by other components. It is difficult to simulate the actual working conditions of all vehicles without a power take-off device. The absence of the external environment of the engine compartment also makes the bench inconsistent with the real working scene. Some students who use the bench for training cannot find the position of the fuse box on the real car.

2. In order to facilitate the theoretical teaching of the working principle, the signal detection of the bench is carried out on a circuit panel outside the engine. Although it is intuitive and convenient, it does not match the detection position of the actual auto repair enterprise, which violates the principle of authenticity of the training .

3. In order not to damage the engine of the bench, the fault setting of the bench is usually simply to open or close the circuit or to plug and unplug the electrical component interface. In this way, some faults of signal distortion cannot be simulated, and the functions of the bench are limited. Frequent plugging and unplugging of the interface will also destroy the connection of the interface, thus damaging the engine.

4. Due to the addition of the manufacturing link of the enterprise, the cost of the bench has been greatly increased, and the school's equipment procurement costs have been increased.

Contents of the invention

In order to overcome the problems existing in the existing training platform. The purpose of the utility model is to provide a practical training and teaching equipment for the electric control system of the automobile engine. The equipment does not damage the engine body and prolongs the working life of the engine used for training; it can simulate a variety of fault states to ensure the authenticity and concealment of fault settings; it improves the work efficiency of student training and skill assessment.

The purpose of this utility model is achieved through the following technical solutions:

A practical training and teaching equipment for an automobile engine electronic control system, characterized in that the equipment includes an external panel C, a signal transfer device A, a fault setting system B, and a group of measuring points consistent with the actual work and maintenance positions, which can test the entire The signal transfer device A of the electronic control component signal under the actual working condition of the vehicle is connected to the engine ECU; the fault setting system B simulates the fault signals of the coolant temperature sensor and the fuel injector, and transmits the fault signal to the engine ECU; Panel C is connected to signal transfer device A.

In the utility model, a group of measuring points includes air flow meter measuring point 1, throttle position sensor measuring point 2, coolant temperature sensor measuring point 3, intake air temperature sensor measuring point 4, Hall sensor measuring point 5, crankshaft position And speed sensor measuring point 6, 1, 2 cylinder knock sensor measuring point 7, 3, 4 cylinder knock sensor measuring point 8, oxygen sensor measuring point 9, carbon tank solenoid valve measuring point 10, cylinder 1 nozzle solenoid valve measuring point 11. Measuring point 12 of cylinder 2 nozzle solenoid valve, 13 measuring point of nozzle solenoid valve of 3 cylinder, 14 measuring point of nozzle solenoid valve of 4 cylinder. The fault setting system B simulates the voltage change of the coolant temperature signal and transmits it to the ECU. The fault setting system B realizes the fuel injector fault signal by simulating the time and duration of the low level signal output by the ECU.

The utility model does not remove the engine from the vehicle, and all parts of the engine are in the original position of the vehicle. Only the ECU of the original vehicle is processed, and the signals of the electronic control components under the actual working conditions of the whole vehicle can be tested. Since the engine body is not damaged, the working life of the engine used for training is extended.

The detection device is made at the actual detection position of each sensor and actuator, which is the same as the real working situation, instead of adding test detection terminals on the teaching demonstration panel, which improves the work efficiency of students' practical training and skill assessment.

The failure of the coolant temperature sensor and the failure of the fuel injector are common engine failure phenomena. The failure of the coolant temperature sensor of the present invention and the failure of the fuel injector are set without destroying the engine body. Using device B, the simulated coolant temperature signal change is transmitted to the ECU, and there is no need to open the circuit to set the coolant temperature sensor fault; the fuel injector fault simulation is realized by simulating the moment and duration of the low-level signal output by the ECU.

Compared with the prior art, the fault setting of the utility model does not damage the engine body and prolongs the working life of the engine used for training; it can simulate a variety of fault states; it ensures the authenticity and concealment of the fault setting; it improves students' practical training and skill assessment work efficiency.

Description of drawings

Fig. 1 is a structural representation of the utility model.

Fig. 2 is a fault simulation flow chart of the utility model.

Detailed ways

A kind of practical training and teaching equipment for automobile engine electronic control system described in the utility model, as shown in Figure 1, the equipment includes an external panel C, a signal transfer device A, a fault setting system B and a set of maintenance positions consistent with the actual work The measuring point can test the signal of the electric control component signal under the actual working condition of the whole vehicle. The fault signal is transmitted to the engine ECU; the external panel C is connected to the signal transfer device A.

The working signal of the main electronic control components of the engine is transmitted from the ECU to the external panel through the device A, the signal is true and reliable, and does not affect the normal operation of the car. A set of measuring points includes air flow meter measuring point 1, throttle position sensor measuring point 2, coolant temperature sensor measuring point 3, intake air temperature sensor measuring point 4, Hall sensor measuring point 5, crankshaft position and speed sensor measuring point Point 6, 1, 2 cylinder knock sensor measuring point 7, 3, 4 cylinder knock sensor measuring point 8, oxygen sensor measuring point 9, carbon tank solenoid valve measuring point 10, cylinder 1 nozzle solenoid valve measuring point 11, cylinder 2 Nozzle solenoid valve measuring point 12, cylinder 3 nozzle solenoid valve measuring point 13, cylinder 4 nozzle solenoid valve measuring point 14. The fault setting system B simulates the voltage change of the coolant temperature signal and transmits it to the ECU. The fault setting system B realizes the fuel injector fault signal by simulating the time and duration of the low level signal output by the ECU. The detection device is made at the actual detection position of each component. Students can use special instruments to detect the DC resistance and voltage of the computer and the sensor in the detection device, and ensure the stability and validity of the measurement signal. Ensure that the student's operation process is consistent with the actual work process.

Fig. 2 is a fault simulation flow chart of the utility model. Fault setting system B is developed based on virtual instruments, which simulates the fault signals of the coolant temperature sensor and fuel injector, and transmits the signals to the engine ECU.

When the coolant temperature sensor is faulty, the engine is difficult to start cold and the idle speed is unstable. Since the core component of the coolant temperature sensor used in the automobile engine is the thermistor, the resistance of the thermistor will change with the engine operating temperature, so the signal voltage transmitted to the ECU will change. ECU judges the operating temperature of the engine according to the received signal voltage, thereby correcting the fuel injection quantity and ignition time. If the coolant temperature sensor fails, the signal voltage transmitted to the ECU will deviate from the standard value. Use a multimeter to measure the abnormal signal voltage value when the fault occurs, use device B to simulate this voltage value, and input it to the engine ECU coolant temperature sensor signal terminal to simulate the fault phenomenon.

When the fuel injector fails, the engine shakes, the idle speed is unstable, and the emission is abnormal. The fuel injector is a solenoid valve actuator, and the engine injects an appropriate amount of fuel into the intake manifold according to the pulse signal of the ECU. When the fuel injector is not working, its two terminals are at high level. When the ECU transmits a low-level signal (ground voltage) to the signal terminal of the fuel injector, the fuel injection solenoid valve works and the fuel injector works. If the fuel supply system fails, the generation time and duration of the low-level signal will deviate from the normal value. Detect this abnormal pulse signal, use device B to generate this pulse signal, and input it to the signal terminal of the engine fuel injector to simulate the fault phenomenon.

The fault setting of the utility model does not damage the engine body, prolongs the working life of the engine used for training; can simulate a variety of fault states; ensures the authenticity and concealment of fault setting; and improves the work efficiency of students' practical training and skill assessment.

Claims (4)

1. A practical training and teaching equipment for the electronic control system of an automobile engine, characterized in that the equipment includes an external panel (C), a signal transfer device (A), a fault setting system (B) and a set of maintenance positions consistent with the actual work The measuring point, which can test the signal transfer device of the electronic control component signal under the actual working condition of the whole vehicle (A) is connected with the engine ECU; the fault setting system (B) simulates the fault signals of the coolant temperature sensor and the fuel injector , and transmit the fault signal to the engine ECU; the external panel (C) is connected to the signal transfer device (A). 2. The vehicle engine electronic control system training teaching equipment according to claim 1, characterized in that: a set of measuring points include air flow meter measuring point (1), throttle position sensor measuring point (2), coolant temperature Sensor measuring points (3), intake air temperature sensor measuring points (4), Hall sensor measuring points (5), crankshaft position and speed sensor measuring points (6), 1, 2 cylinder knock sensor measuring points (7), 3, 4-cylinder knock sensor measuring point (8), oxygen sensor measuring point (9), canister solenoid valve measuring point (10), 1-cylinder nozzle solenoid valve measuring point (11), 2-cylinder nozzle solenoid valve measuring point ( 12), 3-cylinder nozzle solenoid valve measuring point (13), 4-cylinder nozzle solenoid valve measuring point (14). 3. The vehicle engine electronic control system training and teaching equipment according to claim 1, characterized in that: the fault setting system (B) simulates the voltage change of the coolant temperature signal and transmits it to the ECU. 4. The vehicle engine electronic control system training and teaching equipment according to claim 1, characterized in that: the fault setting system (B) realizes the fuel injector fault signal by simulating the time and duration of the low-level signal output by the ECU.

Images