C: \documen from the diagnosis and overhaul of the malfunctioning of the electrical control system of the \ts and setti engine only \administrator\ desktop\kangzhou \hcord motor \ dissertation. Doc on the frequent drying of electrical control engines
Summary: analysis and search for the cause of motor failure require a high level of technology, particularly oil and gas, as oil and gas failure are difficult to diagnose by the failure of the electric jet engine in terms of its own diagnosis of nuclear disharmony, as well as a relatively high rate of failure in electrical engine failure. Discussions will be held on the various oil and gas path failures of the electric jet engine, with recommendations for their removal and corresponding maintenance。
Keywords: automotive powered 360 question-and-answer motive; failure; removal; maintenance
0 foreword
Electric-controlled gasoline-jet engines are intelligent control engines equipped with computers, sensors and execution elements. It can accurately control the air combustion ratio, allowing for sufficient combustion and significantly reducing exhaust pollution. Eating and eating were done at the same time as the state was doing it, and the stability of engine work was enhanced, thereby reducing the pine sulphate-1 noise. The sensor captures instantaneous changes in air intake, engine negative-type displays, which are fed into computers, such as blends, water temperature, air temperature, etc., which calculates the right amount of petrol and the best bweixer fire in the right time and season, and exports the control signal to the oil-jet valves and ignition firearms, so that the engine is optimally performing under all conditions。
1. Frequent breakdowns and removal methods of electric motors in vehicles
When motors are not working properly and the self-diagnostic system does not have a failure code output, the first-end needle application is particularly dependent on the operator's examination and judgement to determine the nature of the malfunctioning aeropathian by-products and to report failure. The following is a summary of the common malfunctions of the motors:
1. 1 engines not active
(1) fragmentation: open the ignition switch and find the most rapid means of securing it until the ignition switch is moved to the starting point and the engine starts with a big hole。
(2) possible causes of failure:
A. The failure of the start-up system prevents the engine from being equipped with electrical coal, which is too slow to move or rotate, as follows: electropharmaceuticals are used to treat the larger population and to correct the battery's power shortage, which pillar of the pole is loose or the pole is severely oxidized; 2 circuit general fuses are broken; 3 ignition switches are malfunctioned; 4 motor failures; and 5 activation circuit circuits or circuit connectors are in poor contact。
B. Firing system failure: the failure of the firing ring resulted in weak or no high-pressure sparks; the failure of the 2-point firearm; and the incorrect timing of the 3-point fire。
C. Fuel-jet system failure: no fuel in tanks; no work or low pressure from pumps; three leaks in fuel pipelines to reduce the size of external rice; four breakout relays; five fuel pressure regulators; and six zero-long filtration filters containing cozy fuel filters。
D. Injection system failure: 1 failure of the glitch control valve or its control line; 2 failure to control the bursting of the hair valve air pipe or the passing of the gas; 3 failure of the air flow meter。
E. Eu failed。
(3) diagnostic exclusion methods and steps。
1 the start-up slot, which does not allow for the movement of the start-up motors and engines, shall be inspected on the basis of a start-up malfunction. First, check battery storage and polar column connections and exposure; if the batteries are normal, check the start-up line, fuse and ignition switch; 2 sets down the oil door to the medium opening position, and then triggers. If the engine is capable of being activated at this time, it is indicated that the failure is either a glitch control valve and its route failure or a leak in the gas pipeline, and if it is still unable to be activated at the medium opening position, the next step should be inspected;3 a visual examination should be performed. Check for leaks in the vents; check for the integrity of the hoses and their connections; check for leaks or ruptures in the venting tubes of the warp shafts; and check for high pressure sparks. If the high pressure spark is abnormal, the high pressure line, the ignition ring, the subwire and the electronic ignition firearm should be checked; the order of the ignition should be checked; and the oil supply of the oil supply system should be checked. (b) to examine the oil pressure in the fuel pipeline when it is confirmed that the tank has tears;7 to check the timing of the ignition and the sequence of the firing of the tanks;8 to check the performance of the fuel pump switches installed on the air flow meter; 9 check the work of the pyrotechnics in each of the tanks; 10 check the ignitions on time. If the ignition is not correct at the time, further checks should be made on the ignition control system; ? B11? Check the power supply and work of the eutu to determine if it is a malfunction。
1. 2 engine failure
(1) fault phenomenon: when engines are working, the rate of turn-off is the rate of engine failure, which is called engine failure。
(ii) causes of failure: the reasons for the loss of motor speed are the failure of the fuel jet system, the failure of the fire control system and the failure of the infusion system. Common causes of failure include the following:
One gas-inducing system has a leak. E. G. Leaks in hoses and connections, leaks in pvc valves, leaks in egr systems, leaks in the vents of oil meters, leaks in oil filters; 2 air filter cores are dirty; 3 air flow meters are not working properly; 4 fuel jet systems for oil pressure are unstable. (a) in the case of pipeline deformation, poor contact with the system line, insufficient pressure on fuel pumps, unstable work on fuel pressure regulators, dirty fuel filters, tremors of breaker relays, etc.; the five-point fire was not correct at the moment; the cold-starter and temperature switch were not working well at the time; and the 7ecu malfunction。
(3) diagnostic exclusion methods and steps: 1 check for leaks in gas pipelines. Check the hoses and connections, the pvc valves, the egr system, the oil-jet plugs, the oil filter covers; 2 check for oil pressure. Check if fuel is too low in fuel tanks and check if pressure is unstable in fuel pipelines. The methods are the same as those used to check if the engine cannot start; check if the air filter filter cores are dirty; check the early angles of the ignition; check the work of the pyrotechnic plugs in each tank; check the work of the cold-activated oil dispenser and the temperature control switch for a single time; check the output voltage of the air flow meter and its relationship to the engine condition; check the oil sprayer; and check the work of the guuam。
1. 3 engine failure
(1) frustration phenomenon: motors working normally at speeds above average, when speeds are low or near at the speed, there was a lack of speed and even a fire, which was a failure。
(ii) causes of failure: wrenching is usually caused by gas intake systems and oil-jet control systems, and at times by mechanical engine failure. The usual reasons for the failure are: one gas leak in the gas intake system; two cold-activated jets and one-time temperature control switches that are not working properly; three oil spray systems that supply abnormal oil pressure; four oil jet malfunctions that cause a poor spray mistification quality; and five units that fail。
(3) diagnostic exclusion methods and steps: 1 check whether gas is leaking in the gas pipe, the pvc valve hose, or the oil gauge; 2 check whether the air filter filter core is dirty; 3 check whether cold-activated oil dispensers and temperature control switches are normal for one time; 4 check whether fuel system pressure is low; 5 check the jets; 6 check the cylinder pressure and gas door gap, if necessary; 7 check the euu。
1. 4 combination of thin air malfunctions
(1) frustration phenomena: motors can be considered to have too low a mixture failure due to unstable speed, apparent lack of power and a return to fire。
(2) causes of failure: leakage of gas from the ingestion system; malfunctioning of 2 cold-activated jets and temperature timing switches; low fuel pressure in the 3 systems; 4 oil dispenser haircards or jamming; 5 air flow meter failure; 6 water temperature sensor failure; 7 air-gate position sensor failure; 8ecu failure。
(3) diagnostic exclusion methods and steps: 1 check if there is a leak in the gas intake system; 2 check the timing switch for the cold-starter; 3 check if the oil dispenser is plugged and haircard failure; 4 check the air flow meter; 5 check the water temperature sensor; 6 check the position of the air-saving door sensor; 7 check the input and output signals at the end of the eu。
1. 5 accelerating malfunctions
(1) fragmentation: the engine works perfectly well when the engine is slowly accelerating from a low to high speed, but at a very rapid rate, the engine moves slowly, sometimes by asthma or backfire。
(2) causes of failure: leakages in the gas feeding system; low oil pressure in the 2 systems; low fire voltage at 3 points; late fire time at 4 points; low pressure in 5 cylinders or too small gap in the gas door; abnormal performance of 6 gas door position sensors; malfunctioning of 7ecu。
(3) diagnosis exclusion methods and steps: 1 check for leaks in the gas intake system; 2 check for high-pressure sparks; 3 check for normal fire forward angles; 4 check for system oil pressure; 5 check for normal air-saving door sensors; 6 check for normality of end-point signals in the euu; 7 check for air-gate gap and cylinder working pressure, if necessary。
2. Diagnosis and removal of electrical engine failure
2. 1 non-activation failure diagnosis and removal flow charts
The failure or slowness of electrically controlled engines is due mainly to the failure of the accumulators or the start-up system to check the batteries and the start-up system for exclusion: if the arc-rotation is normal and the engine cannot start, it is mainly due to the failure of the sensors, implementers, electrical control units and their circuits of the fuel-jet system, which can be excluded as shown in figure 1:
2. 2 diagnosis and removal flow charts for accelerations or malfunctions
2. 3 lightening or out of fire
The main reason for the failure or failure is the failure of the glitch control system, which can be eliminated according to the procedure shown in figure 3:
3. Attention during testing and maintenance
3. 1 points for maintenance of electrically controlled engines
(1) a petrol-jet-control system requires a high level of cleanliness of gasoline and should use licence plates and fully qualified leaded gasoline. Fuel filters are periodically replaced in order to prevent foreign objects in fuel from blocking the jets。
(2) the use of power sources is strictly in accordance with requirements. The polarity must be correct at the time of installation of the battery, otherwise the electronic component will burn。
(3) to avoid, as far as possible, severe vibrations on computers and to prevent water immersion into zero parts of the electrical control system。
(4) in the event of a failure of battery power to allow the engine to start normally, the battery shall be recharged or replaced in a timely manner, and the motor shall be activated as far as possible by means of cross-circuiting。
(5) non-water-washing microphone control units and other electronic devices. The environmental humidity of the engine storage site should not be too high and the floor should be washed with minimum water during the summer。
(6) protection of micro-machine systems from severe mechanical shocks。
(7) engines are to be removed from electrical equipment capable of launching electromagnetic fields and avoid interference with micromechanical systems by powerful electromagnetic fields in space。
3. 2 points for inspection of electrically controlled fuel systems
(1) the warning light shall be lighted when the ignition switch is open and the engine does not start. Upon normal engine startup, the warning light shall be extinguished or, if not, the computer self-diagnosis system shall detect malfunctions or anomalies. The batteries cannot be cut off from circuits at this time in order to prevent the loss of fault codes and related information stored in micromachines. The failure of the electronic petrol jet system should be judged on the basis of the number of flashes or failure codes of the output, and the failure codes should be read with specialized equipment。
(2) prior to the overhaul of the oil supply system, the wires of the batteries shall be removed。
(3) the electric gasoline pump is controlled by a switch in the air flow meter, in addition to the ignition switch. When the ignition switch is connected, the gasoline pump will only work continuously if the engine is in normal working or start-up condition and air flow meters detect air flow signals or micromachines detect speed and ignition signals. It had a higher oil-producing pressure than the normal fuel supply system and, when damaged, could only be replaced with a prototype electric gasoline pump。
(4) at the time of repair, no electrical installations are to be removed from work, regardless of whether the engine is functioning or not, as long as the ignition switch is connected. Because these devices tend to be step-by-step and have a certain electrical sense, when they are suddenly cut off from their electrical currents, they produce high instantaneous voltage on the circuits, causing serious damage to electronic devices。
(5) if arc welding is required, the power supply line of the electrical control unit shall be disconnected。
(6) when overhauling micro-machines and the sensors and implementers connected to them, the operator must pre-empt the static power on his body and must attach an iron and metal belt to his wrist and to the car to avoid damage to the micro-mechanical system caused by static。
