Excessive speed in driving heavy vehicles has been a social and governmental issue around the world for many years, primarily from the perspective of road safety.
One effective solution to prevent speeding in commercial vehicles is to equip them with a road speed limiter system, which restricts maximum vehicle speed to the required speed limit without loss of engine power. This is realized by limiting the required fuel demand according to a set speed limit. The maximum speed limit is set using an electronic control unit. Information about the current speed of the vehicle is measured with a speed sensor that supplies an electronic speed signal to the control unit. The control unit limits the fuel output in different ways, depending on the fuel injection technology of the engine.
Two different engine technologies used in vehicles require different speed limiter device applications.
1. Mechanically controlled engines
Engine revs are regulated with a mechanical throttle pedal, which transmits the pedal position mechanically via a throttle cable or rod to the injection pump (or throttle body). The fuel demand on the injection pump is adjusted via a mechanical injection pump lever or a mechanical throttle plate. To realize a speed limiting system on a mechanically controlled engine, an electromechanical speed limiter is used to decouple the driver’s demand from the injection pump in order to limit the maximum speed. In this application, the vehicle must be equipped with a separate speed limiter system.
2. Electronically controlled engines
Engine revs are regulated with a mechanical throttle pedal which converts the mechanical pedal position to an electrical signal, and transmits it via an electrical wire to an electronic control unit. The control unit regulates the fuel demand via electronic injection such as electronic diesel control (EDC), a pump line nozzle system (PLD) or common rail direct injection (CDI). In this application, the speed limiter function could be one of numerous functions managed by the engine’s or vehicle’s electronic control unit.
The FRSC will begin the enforcement of the use of speed limiter for commercial vehicles on Nigerian roads from the 1st of April, 2016.
All vehicles owners, fleet operators, ministries, departments and agencies especially commercial vehicle operators are hereby enjoined to align with this life-saving initiative by ensuring the installation of speed limiters on their vehicles to curb the wanton carnage on our roads and to avoid arrest and resulting sanctions.
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