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CONTROL SYSTEM 01–40–13 01–40 DRIVE-BY-WIRE CONTROL OPERATION [LF] E5U014000000N60 Idle Speed Control • Controls the throttle valve opening angle so that it is close to the target idle speed calculated by the PCM. • The PCM calculates the target throttle opening angle by adding each type of correction to the basic duty value which is the basis of the throttle valve opening angle, and then sends a duty signal to the throttle valve actuator. • Each type of correction is as follows. Correction Accelerator Control • Controls the throttle valve opening angle through control of the throttle valve actuator, according to the amount of AP depression. • The PCM controls the throttle valve actuator so that the actual throttle valve opening angle is close to the target throttle valve opening angle. • The final throttle valve opening angle is determined by the sum of the target throttle opening angle during idling and the target throttle valve opening angle during regular driving. • The target throttle valve opening angle during regular driving is determined based on the transmission gear position, the amount of AP depression and the engine speed. If the target throttle opening angle is at the fixed • The PCM sets the throttle valve to the fully-closed position when the ignition switch is on or off and executes the idle position learning function to learn the throttle valve position. Due to this, changes in the throttle valve • When the ignition switch is off, a main relay on request is output and the fully-closed learning function is executed. (See 01–40–11 MAIN RELAY CONTROL OPERATION [LF].) Correction Purpose Condition Amount of Correction Correction Target Conditions Correction amount A/C load correction Prevents decrease in idle speed due to A/C is operating. A/C operation →correction Electrical load Prevents decrease in idle speed due to Idle speed during electrical High electrical load →large correction D-range correction Prevents decrease in idle speed due to D-range signal is input. Low idle speed when shifted →large correction Dashpot correction Prevents decrease in idle speed due to Decelerated High engine speed →large correction Correction at engine Prevents decrease in idle speed after After cranking and engine Low ECT →large correction Hot engine restart Prevents decrease in idle speed from Just after cranking and engine °C {140 °F} or more the IAT is 50 °C {122 °F} or more High intake airflow →large correction Feedback correction Sets idle speed to target engine speed. Idle speed during idling (vehicle is stopped) is over or Actual idle speed →volume increase correction →volume decrease correction Feedback correction Sets to the target engine speed when During deceleration at fully Large difference between →large correction Engaged coasting Reduces shock when the transaxle When coasting clutch is High vehicle speed →large correction Learning correction Stores intake air volume changes During feedback correction A °C {185 °F} or more. During idling →average value of feedback correction A |