1. Computer monitoring and display system The system is the core part of the instrument, using a PC as a host, the display is 14-inch color display, operating system is Windows 98, and equipped with powerful monitoring and control software. 2 Engine Analyzer Functions 2.1 Engine Analyzer Main Menu After the user data is entered, the main menu of the engine analyzer will appear. The main menu of the engine analyzer includes: gasoline engine performance detection, electronically controlled engine parameters, diesel engine performance detection, Failure analysis, utility tools, system settings, system exit, system help, display menu, clear data, display report. The user data entry system enters the registration interface, where the vehicle information and rated power of the vehicle under inspection are entered. Gasoline engine performance tests can perform various tests on the ignition system, power balance, and cylinder efficiency. 22 1 Test Electronically Controlled Engine Parameters Various sensor signals, speed signals, and vacuum levels can be tested to obtain the operating information of the electronic control system. The diesel engine performance test can test the injection pressure, injection advance angle, and rotational speed stability. Failure analysis can display the test result records of all vehicles previously tested. This can be used to perform qualitative analysis of the test vehicle, as well as repair files for future reference, and print the previous test results as a report. Utilities There are digital multimeters and digital oscilloscopes in the utility that simulate the use of multimeters and oscilloscopes. System Settings In the System Settings, you can set the performance of the data settings, exhaust gas analysis settings, smoke analyzer settings, and color settings. The system helps explain how the system operates. Clearing data can clear this test data without restarting the system. The display report can be previewed as test report data. The system exits the communication between the upper computer and the lower computer, exits the test system, and returns to the Windows 98 desktop. 2. 2 Gasoline engine main testing items: no-load battery voltage, internal battery resistance (battery voltage waveform), starting voltage, starting current, starting speed, cylinder relative cylinder pressure ratio, cylinder non-uniformity (starting voltage waveform), various Charging voltage, charging current (charging voltage waveform) at the speed of rotation; primary ignition waveform, closing angle, overlap angle, ignition timing (primary ignition waveform), secondary ignition waveform, secondary ignition high voltage, sub-cylinder ignition high voltage (secondary ignition Waveform); Speed ​​drop after single-cylinder misfire, single cylinder speed drop ratio (single-cylinder speed drop waveform); engine no-load acceleration time, deceleration time, average power, instantaneous power at set speed, torque (max. Power wave); intake pipe vacuum (vacuum waveform); timing advanced angle; temperature. 2. 3 diesel engine main testing items: no-load battery voltage, battery group (battery voltage waveform), starting voltage, starting current, starting speed, cylinder relative cylinder pressure ratio, cylinder non-uniformity (starting voltage waveform), various Charging voltage, charging current (charging voltage waveform) at high speed, high-pressure fuel supply waveform (card supply waveform), maximum oil supply pressure, oil valve opening pressure, fuel supply advance angle (string type oil pressure waveform); Speed ​​drop after single-cylinder misfiring, single cylinder speed drop ratio (single-cylinder speed drop waveform); engine no-load acceleration time, deceleration time, average power, instantaneous power at set speed, torque (maximum power waveform) Diesel injection advance angle. 2. 4 Oscilloscope test items In the detection process, if you need to detect some signals, you can select the oscilloscope function. The oscilloscope channel 1 is set to: universal probe (input voltage must not exceed 50 V), channel 2 is set to built-in channel, which can selectively display the waveform measured by the analyzer sensor (when using a universal probe, it must be The battery voltage clip is red +, black - clamped on the positive and negative terminals of the battery). 2. 5 Main EFI Engine Testing Items Main EFI engine test items include: speed (phase); temperature sensor; vacuum in intake manifold; throttle position; knock signal; oxygen sensor signal; air flow meter; injection pulse Signal; speed sensor. 3 Engine Analyzer System Features The engine tester uses a waveform processing method: battery voltage, ignition, cylinder pressure and other signals are collected in the computer with the waveform code, and displayed in the oscilloscope window, all the data and waveforms and characteristic signs One-to-one correspondence, so it can truly reflect the signal characteristics under various conditions, and it is very convenient for theoretical analysis and troubleshooting. Automatic control of the test process, such as start timing, acceleration timing, cylinder timing, temperature control, do not require manual intervention. Intelligent processing not only simplifies the operation, but also shortens the test time and greatly improves the detection efficiency. Using Windows 98 software platform, has a good user interface and powerful data management capabilities, and provides network detection. The test method is flexible and quick. It can carry out single tests, multiple tests, and instant tests. Optional CTR display for subtitles prompts users to operate easily. All waveforms are displayed in coordinates, and the movement and scaling tools are complete for quantitative analysis and fault determination. With powerful waveform acquisition and processing functions, it can clearly display various waveforms including the ignition waveform. The system has multi-level protection, strong anti-interference ability, stable and reliable performance. Using a PC as a host, with strong hardware features. The abnormal sound signal is provided with a filter function and a spectrum analysis function, and the collected signal can be analyzed many times. Compared with similar testers, the number of sensors used is small and the efficiency of the sensors is high. Test battery current, ignition high voltage, diesel fuel supply, etc., without removing the original circuit and piping. All kinds of decoder interface is complete, which is helpful to increase the detection function of the EFI engine fault code. The analyzer is designed to detect the operating conditions and operating parameters of the various engine systems, perform no external load measurement and discharge performance, and can collect ignition, fuel injection, electronic control systems and sensors, intake and exhaust systems in real time, and Relative to the dynamic waveform of the cylinder compression pressure, it can also perform numerical measurement, performance analysis, waveform storage and playback, etc. He provides scientific basis for the judgment of the engine's technical status and fault diagnosis. In particular, the upgraded version 5.0 of the EA 1000 engine performance analyzer has significantly improved performance in all aspects, mainly reflected in the electronic control parameters, primary ignition waveform test, secondary ignition waveform test, starting current test, relative cylinder compression Pressure testing, open user interface settings, user test file creation, exhaust gas analyzer connection, diesel smoke meter connection, complete help system, and practical digital oscilloscope functions. 4 Using the EA1000 engine analyzer to troubleshoot the engine's ignition system The engine's operation is cyclical, so the curve of the signal of the ignition system over time must also be a periodic curve. Use the ignition waveform observation function of the engine analyzer. This change curve can be clearly seen. No matter whether it is a normal or abnormal ignition signal, it can be clearly displayed on the ignition waveform. Therefore, the state of the ignition system can be judged according to the shape and amplitude of the ignition waveform. The waveform analysis of various specific ignition systems is as follows: The engine analyzer provides various forms of observation of the ignition waveform for the inspectors to quickly and accurately determine the cause of the failure. Generally, there are flat column waves, parallel waves, and overlapping waves. Because the ignition waveform is obviously affected by the engine's ignition conditions, it can effectively detect the failure of the ignition system components; the ignition system has higher measurement precision and is more accurate in judging the fault; therefore, the ignition system of the gasoline engine is judged to be faulty and the engine operation is unstable. The power drops. It is inaccurate to judge the fault of the ignition system only by man's intuition. It is necessary to carry out the necessary analysis and comparison through actual detection, and then to find out the fault of the automobile engine. 4. 1 flat column wave flat column wave is mainly used to analyze the secondary voltage fault, the cylinder secondary breakdown voltage (ignition voltage) is equalized, the spark voltage is different, etc., in the flat column wave graphics at a glance. The secondary breakdown voltage (firing voltage) changes from each cylinder and reacts whether the secondary breakdown voltage (ignition voltage) of each cylinder is balanced or not, and whether the spark voltage is different. Conclusion: Analysis of the secondary voltage faults, some secondary breakdown voltage is high, and some are low, but they can meet the normal working needs of the engine. 4. 2 Parallel wave The parallel wave is formed by aligning the starting points of the ignition waveforms of each cylinder and arranging them from the bottom to the top in the firing order. Figure 4 is a four-cylinder engine secondary voltage side-by-side wave, by the parallel wave can see the overall inline wave of each cylinder, analysis of the cylinder closed and open angle and the working status of each cylinder spark plug is very convenient. Conclusion: The parallel wave can be seen in the overall appearance of the cylinder inline wave, analysis of the length of the contact closure segment, indicating that the breaker wear uneven camber or loose small shaft, the opening angle is very small, but can meet the engine Need for normal work. 4. 3 Overlapped Overlapping Waves The ignition wave starting points of each cylinder are aligned and all overlapped in one horizontal position. If the contactor-type ignition system distributor uneven cam wear or camshaft wear will cause poor waveform overlap, the difference between the end of each cylinder waveform is the size of the overlap angle. If the distributor camshaft of the contact-type ignition system is seriously worn, it will cause poor waveform overlap, and the difference between the end of each cylinder waveform will be the size of the overlap angle. Conclusion: Overlapping waves align the starting points of ignition waves in each cylinder and all overlap in a horizontal position. It can be seen from the waveform that the offset of the overlapping waveform is too large, indicating that the wear of the breaker cam is not uniform or the loose shaft of the breaker is loose, but it is still in the normal range. 5 Conclusion The EA1000 engine analyzer has advanced technology and complete functions, which can better meet the needs of the repair industry and use him to perform fault diagnosis on the ignition system of automobile engines. The test results show that the EA1000 engine analyzer can detect the parameters of the RS20(E) automobile engine ignition system with good reproducibility, and the waveform curve is true. It is a good helper for fault diagnosis of technicians. Engine testing is a complex task. The current instruments and testing methods make it impossible for diagnostics and diagnostics to easily correspond to faults and parameters. Foreign advanced instruments cannot do this either. Therefore, it is necessary to get rid of the traditional artificial intuition testing and implement scientific diagnosis to meet the rapid development of vehicle maintenance needs.
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The composition and practical exploration of engine analyzer