Automotive engine control valve of the principle of waveform analysis of fault (a)

1. Idle Speed Control (IAC) solenoid valve



Idle speed controller is designed in a number of mechanical and electrical and mechanical installations, in the electronically controlled engine management system, electronically controlled thermostat to replace the old plug, paraffin-type, vacuum tank, such as the location of similar devices. Idle speed electronically controlled solenoid valve to prevent idling of the stall, and enhance the stability of idling in the slow speed means used to reduce the classification of hydrocarbon HC emissions. Idle solenoid valve to maintain the idle speed as low as possible and not put out, even in the open air-conditioners, generators, ancillary facilities such as power steering increase the engine load can also be possible to maintain stability.



Idle speed controller is a number of solenoid valves (most Ford vehicles) and some rotary motor (European Bosch BOSCH), others are stepping DC Gear Motor (most applicable, Chrysler), but all the examples are by the control computer to change the signal amplitude or pulse width to the ultimate control of the operation of idling.



Idling by the sensor to detect engine speed, idle speed be adjusted in a predetermined set of procedures to maintain paragraph. Control of the computer such as air-conditioning compressor from the switch, battery charging indicator, power steering switch and the free / parking block of ancillary equipment such as switches to receive the digital input signal switches, each switch will trigger the compensation is scheduled to set the idle command and send it to idle speed controller, engine speed when the throttle to close to or below the minimum speed stability, Idle Speed Control system came into play often, electronically controlled idle air bypass the throttle valve to allow the flow to produce results similar to open throttle.



Test Method:



To make the engine idle operation and ancillary equipment (air conditioning, fans, wipers) on or off, if equipped with automatic transmission car in the parking stalls and switch between forward. This will change the engine load, causing the engine control computer to the idle valve to change the output command signal.



Waveform results:



Confirmed that compensation for a variety of idle mode waveform amplitude, frequency, shape, pulse width of scale, such as are found in the right context, and the repeatability and consistency.



Confirmed when the control signal changes the computer's command, the solenoid valve response, and changes in engine speed has also observed the emergence of the following circumstances:



Switch when the proportion of ancillary electrical equipment to open or close the block to block transmission, the control computer to control the idle speed will change the output command. Idle speed changes, Idle Speed Control Valve should open and close throttle bypass hole, if the idle speed remains unchanged, should doubt the next idle valve damage or obstruction.



Idle Speed Control valve in the diagnosis and control circuit, we should make sure that section of the vacuum leak check the air leakage or inappropriate, they will idle control system problem. 

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