Note: Beginning in 1985, Ford multi-port EFI uses an Idle Air Control (IAC) valve, which allows air to bypass the throttle plates. Unlike the stepper motors used by GM and Chrysler, the Ford units only have two terminals and one winding. These units regulate IAC plunger position using pul...
air quantity of an idle control valve is caculated as a total sum of an air mass accumulated in a chamber by an intake air system model and an air mass sucked in a cylinder, and based on a calculation value of a pass air qnantity, the opening of an idle control valve is controlled...
A vehicle is driven by an internal combustion engine having an air induction passage with an idle air control valve positionable by a stepping motor in response to valve opening and valve closing pulses. A counter normally counts the pulses arithmetically to provide an indication of valve position...
So, the ECU senses the lowering of the engine speed and actuates the idle air valve to allow more air into the engine manifold, bringing RPM to its base level. This valve will work the most on cold starts. Once the engine is warm it hardly opens at all. Many cases of cold start is...
control valve is closed, the air flow rate is minimized and when the throttle control valve is opened, the flow rate through the induction system can be somewhat controlled. The use of a bypass passage allows air to bypass the throttle control valve for supply to the engine even when the ...
Common cabin air assembly water separator liquid check valve 21 charcoal filters stationwide HEPA filters in Node 3 Blower in carbon dioxide removal assembly (twice, first replacement failed) Sample Distribution Assembly in Node 3 Mass Spectrometer assembly ...
Introduction Idle Stepper Motor is mainly used to control the throttle valve body of various automobiles, and has the advantages of good stability, high precision, and long life.The idle speed motor is an elemen...
A block diagram of the injector drive unit is shown in FIG. 3. The digital computer (hereinafter referred to as the CPU) 301 in the electronic control unit 13 computes the amount of fuel required by the engine, converts the amount of fuel thus calculated into an injector valve opening tim...
valve to control the quantity of idle air being admitted into the manifold as a function of time based on the initial temperature of the engine independent of the actual rate at which the engine warms up. In another system suggested by Charron U.S. Pat. No. 3,739,760 the idle air ...
the controlling switch is either connected to the solenoid operated fuel control valve on the fuel pump or the solenoid engine cutoff on the injector control rack. In the case of a gasoline engine, the key operated switch is interposed in the ignition system. The controlling switch may or may...