1 - injection valve (injector)
2 - cold start valve
3 - dispenser (distributor) fuel
4 - electromagnetic pressure control device
5 - fuel pressure regulator
6 - mixture regulator
7 - mixture adjusting screw
8 - retaining damper
9 - idle speed regulator
10 - sensor-switch of the extreme positions of the throttle
11 - thermal time switch
12 - temperature sensor
13 - electronic control device
14 - fuel pressure accumulator
15 - fuel filter
16 - electric fuel pump
17 - gas tank
KE-Jetronic is a mechanical petrol injection system, electronically controlled. The main mechanical system provides sufficient system reliability in case of failure of the electronics.
Fuel is drawn from the fuel tank by an electric fuel pump and fed through a pressure accumulator and fuel filter to the fuel distributor. Air is sucked in by the engine through the suction pipe. Its amount is measured with an air quantity meter. The fuel distributor distributes a certain amount of fuel to the individual cylinders through the injection valves in accordance with the amount of air. Additional sensors ensure the correct dosage of fuel in extreme situations of engine operation.
To reduce fuel consumption, the injection system, except for engines of 90 hp. has a device for stopping its supply. The device works in such a way that when the driver releases the gas pedal, the fuel supply to the injection valves is automatically stopped. The termination of this device is determined by the number of revolutions of the engine and its temperature.
The fuel pressure accumulator maintains pressure in the system for a long time, even after the engine is turned off. This prevents vapor lock and improves hot start.
A diaphragm fuel pressure regulator maintains a system pressure of 564 bar.
An electro-hydraulic actuator is located on the fuel distributor and controls the fuel flow depending on the operating state of the engine. Its task is to enrich the mixture during cold start and engine warm-up. In addition, the actuating element closes the fuel supply in the forced idle mode at engine speeds above 1400 rpm.
The idle air control regulates the flow of air at idle bypassing the throttle. This achieves the same idle speed regardless of whether the brake booster or air conditioning compressor is on or off. The idle speed controller is controlled by the KE injection system electronic unit.
The exhaust gas lambda probe is installed in front of the catalytic converter. It measures the residual oxygen content in the exhaust gases and sends a corresponding voltage signal to the KE control unit. In accordance with this, the control unit regulates the ratio of fuel and air so that they can be burned in the catalyst. In order for the sensor to reach its operating temperature as quickly as possible (over +300°С) and to keep it constant in the future, it has an electric heating.
Caution: Special cleanliness must be observed when working on the injection system. Before disassembly, the parts must be washed with gasoline. The system is under high pressure. Therefore, before disassembling the system, it is necessary to relieve pressure by opening at the cold start valve.
Attention: In this case, it is necessary to cover the connection with a cloth beforehand. There is a danger of being hit by high-pressure fuel! Remove leaked fuel with a rag.
Attention: When the ignition is switched on and the engine is running, the plug must not be removed from the KE control unit, as the unit may be damaged due to a current peak.
Attention: Observe safety measures when working with the electronic ignition system.
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