A mechanical speed limiter is used by vehicles with mechanical accelerator pedals.
DBV components include:
Functions Of FMX DBV Speed Limiters
Assume the Speed is set to 80 km/h.
A Reference to the FMX DBV Speed Limiters Parts
Speed Limiters are brains formed by ECU
A factory-programmed microcontroller determines what functions are to be performed at each stage of the process.
ECU has three connectors as described below.
Mounting of ECU
Understanding the Fuel Control Unit (FCU)
The FCU is divided into two chambers. Automatically, one is controlled by the ECU and the other manually, by adjusting the bypass screw. When the bypass screw is fully open, the speed limiter's control is reduced, and vehicles tend to move faster.
The vehicle will not be able to control smoothly if the bypass screw is fully closed. Therefore, it needs to be adjusted after completing the vehicle road test.
Find a suitable location to fix the FCU near the engine:
Understanding the speed sensors
An ECU uses the speed pulse signal from the speed sensor to determine & control the vehicle's speed.
New Generation Vehicles:
New generation vehicles will have electronic speed sensors near the gearbox. Such cases can be handled using an electronic sensor adapter / SSW, which converts the vehicle pulse to a square wave pulse, which is compatible with the ECU.
In vehicles equipped with mechanical speedometers, we need to use mechanical speed sensors, which can be classified into three categories.
Mounting of the Speed Sensors
Install the speed sensor between the gearbox and speed-ometer cable of the vehicle, and ensure both ends are securely tightened. The sensor wire is routed safely to the cabin and connected to the ECU.
We can tap the signal wire from the vehicle speed sensor and connect it to our ECU. The Electronic Sensor Adaptor/SSW converts any waveform into square wave pulses.
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