The idle speed is maintained constant by the idle speed controller (pic. 3.23), which is located in the bypass, air channel, made parallel to the throttle valve.
The regulator is a permanent magnet actuator. On the anchor shaft (4) damper installed (6), which is rotated. overcoming the force of the follower spring (7). When the throttle valve is closed, the air passage is blocked to a certain extent by the regulator valve, which ensures the required engine speed at idle.
The idle speed controller is controlled by commands from the ECU-KSUD, which determines the degree of opening of the rotary damper, depending on the incoming information. At the same time, the ECU ECU changes the ignition timing accordingly. The value of the idle speed stored in the PROM of the ECU-KSUD is compared with the actual value and adjusted accordingly, which makes it possible to exclude a change in the idle speed of the engine as a result of the inclusion of additional energy consumers (radio, air conditioning, lighting), as well as as a result of mechanical wear of parts, leaks or differences in friction resistance on various parts.
On vehicles with automatic transmission (automatic transmission) when the selector lever is in position 1, 2, 3, 4 or «D» The idle speed controller increases the speed to compensate for the reduction in speed caused by the operation of the torque converter.
When starting a cold engine and during its warm-up, the idle speed controller performs the functions of an additional air supply channel, ensuring that the idle mode is maintained within the specified limits regardless of the engine load.