The world first: STIHL Injection electronically controlled fuel injection

Abrasive cutting in a new dimension

The basis of this revolutionary engine technology is electronic characteristic mapping. The new aspect is that the ignition timing is not determined by engine speed alone but also by load. The electronically controlled injection system always determines the optimum ignition and fuel injection values for every operating state, and so you can expect top performance in every situation. With the new STIHL Injection system, compromising on engine tuning is a thing of the past. There is no need for a carburettor, nor for any manual settings. The fully automatic engine tuning, which is optimised for power and consumption, guarantees you top-class power output at all times and for all tasks.

Generator

The generator produces all the power for the controller and, thus, to operate the cut-off saw. And it does so right from the first revolution of the crankshaft, while the machine is still starting up. That's not its only role, though: all the time the machine is running the generator continually reports the crankshaft position, and thus the engine speed, back to the controller.

Sensor

The sensor measures the temperature and pressure in the crankcase. It transmits the data to the controller.

Controller

The controller is the core of the STIHL Injection system. It constantly analyses the data from the generator and the sensor and controls fuel injection and ignition accordingly. The controller determines the air mass, in other words, the machine load state, from the temperature and pressure data supplied by the sensor. It uses that information together with the speed data from the generator to work out the quantity of fuel needed, the injection duration and the appropriate injection timing. On that basis the injection valve is precision-activated and ignition is initiated. As well as controlling injection, the controller also regulates the electronic water control system.

Injection pump

The injection pump keeps the fuel pressure constant. That ensures enough fuel at the optimum pressure is always available to the injection valve according to the operating state at the time.

Injection valve

On command by the controller the injection valve sprays the optimum quantity of fuel directly into the crankcase. This process is synchronised perfectly with the combustion cycle.

STIHL cut off machine TS 500i

Interactive 360-degree view of the TS 500i.

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STIHL Injection - a world first

Abrasive cutting in a new dimension: this is how the world works.

STIHL Injection (33.7 MB)