Rev limiter

A rev limiter is an automated technical means on internal combustion engines or engines which counteracts reaching an upper limit speed, a further increase in speed.

Purpose

A speed limitation is provided when the risk of mechanical damage at a critical maximum speed is exceeded threatened, but also to be expected with increased wear or maintain optimum operating conditions.

In automotive engineering, in some manufacturers, such as Daimler (Mercedes), installed additionally still a Standdrehzahlbegrenzer which additionally limits the engine speed when the vehicle in order to avoid (eg slippage of the clutch) or deliberate bang -offs possible damage to the drive train or motor through a driver errors.

Diesel engines are generally equipped with a speed limitation, since with mechanical injection without additional control, the injected amount of fuel with the engine speed increases ( leakage losses in the injection sink ). Gasoline engines need not in all cases necessarily a speed limitation, since the intake and flow losses have throttling at high speeds.

Execution

Otto engines, both the ignition and the fuel supply can be interrupted. The ignition cut was done earlier by a centrifugal switch in the distributor, but this would inevitably result in today's vehicles, damage to the catalyst. Rev are now integrated in the engine electronic control of internal combustion engines. Today throughout the fuel amount is reduced and diesel engines and gas turbines.

Special Applications

Overspeed

In principle can be used also to any speed limit, a speed limiter. To the engine speed can be combined with a certain speed to a speed to be converted, and, on reaching a target again, the fuel supply is throttled.

This allows for fast cars on a ( reasonable ) speed, truck, for example, be limited to a maximum speed limit or any vehicles on a particularly economical terminal velocity.

Removing Drehzahlbegrenzern

Tuning companies that shut down the speed limit, put an electronic device in the signal line. This plays in front of the controller, it would be only a tempo below the target size. The more " throttle " remains possible. Massive dangers here are the overload of the drive train from the engine, transmission to the wheels and especially the inadequate maximum permissible speed of the tires. Furthermore, the general operating and insurance coverage lapse.