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Video Petrol Injection 1
Video Petrol Injection 2
Video Petrol Injection 3
Video Petrol Injection 4
Video Petrol Injection 5
Video B-Dir. Combustion
Video Dir. Petrol Injection 1
Video Dir. Petrol Injection 2
Video Dir. Petrol Injection 3
Video Dir. Petrol Injection 4
Video Dir. Petrol Injection 5
Video Petrol Injection Kugelf.
Video Homog. Working
Video Stratified-charge Oper.
Video Fuel Distrib.
Video Induction System
Video Petrol Injection Signal 1
Video Petrol Injection Signal 2
Video Idle Speed Device
Video Mass Air Flow Sensor 1
Video Mass Air Flow Sensor 2
Video Mass Air Flow Sensor 3
Video System Press. Reg. 1
Video System Press. Reg. 2
Video Injection Valve
Video Ind. Pulse Generator
Video Single Point Injection 1
Video Single Point Injection 2
Video Single Point Injection 3
Video Single Point Injection 4
Video Unregistrated Air
Video Lambda Sensor 1
Video Lambda Sensor 2
Video Lambda Sensor 3
Video Lambda Sensor 4
Video Lambda Sensor 5
Video Thermo Time Switch
Video Side-channel Pump
Video Peripheral Pump

Video First Fuel Pump
Video Petrol Injection Pump
Video D-Jetronic (MPI)
Video K-jetronic
Video KE-jetronic
Video KE-Jetroncic - Test, Diagn.
Video L-jetronic
Video LE-jetronic
Video LE-motronic
Video LH-jetronic
Video Vol. Air Flow Sensor
Video Idle Speed Device
Video Aux. Air Valve
Video Thermo Time Switch
Video Roller Vane Pump

Video Petrol injection 1
Video Petrol injection 2

          A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Single Point Injection

Now only has significance in very low price solutions

In the meantime, the single point injection is clearly on it's way out. Whereas it was previously found in engines with up to two liters of capacity, nowadays, it is installed, at most, in engines of half that size. The reason lies mainly in the exhaust gas regulations which are becomming more and more stringent, an engine without differentiation between the individual cylinders can no longer keep up. Modern multi-point injection systems deliver far better results, are however, noticeably more complicated.

- only one injection valve,
- No regulation of the system pressure depending on the inlet manifold pressure,
- instead of an air-volume meter, only a throttle potentiometer,
- larger distance between the heat-stressed parts, thus ...
  - lower vapour development,
  - lower supply pressure,
  - more reasonably priced fuel supply pump.

Lambda regulated exhaust gas decontamination with fewer components

The first electronically controlled central injection was developed in 1974 by GM. Later Bosch involved themselves with the Mono-Jetronic. There is only one injector-valve for all the cylinders, which injects intermittently above the throttle flap. The injection amount is regulated by the opening timing.
In the beginning, because of the lower supply pressure of 0,75 to 1 bar, only a single-stage turbine pump is installed. The system pressure regulator has, as opposed to the Multi-point injection , no vacuum connection, because the system pressure regulation is independent of the vacuum pressure. The injection amount is exclusively dependent on the injection time, because the injection takes place above the throttle flap and not in the vacuum area. The system pressure regulator can be seen below the injector-opening in figure 3.
Apart from the Lambda sensor, the throttle flap potentiometer (figure 4 on the far right) is an important sensor for the determining of the injection amount. In addition, the control device still also needs the air- or the coolant temperature and the relationship to the crankshaft.The Mono-Jetronic (Bosch) controls the idling through a servo-motor with worm-drive, the Multec (GM) does it through a bypass. 11/10

Inductive sensorPosition of the crankshaft, RPMs
Lambda sensorRemaining oxygen in the exhaust gas
Temperature sensorFor coolant and intake air
Throttle-flap-potentiometer (Figure 4, on the far right)Stress signal

Injection valve... enables the millisecond allocation of fuel.
Regeneration valve... transports fuel to the injection system from the activ-carbon filter.
Fuel pump... may only run when the engine is running (safety circuit).
Throttle valve adjustor... decisively influences the idling.               Top of page               Index
2001-2015 Copyright programs, texts, animations, pictures: H. Huppertz - E-Mail
Translator: Don Leslie - Email:

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