Speed Limitation Device (SLD) from Rosmerta Technologies Ltd is a micro-controller based electronic unit which constantly monitors and controls the vehicle speed within a preset limit, thus tackling the problem of over-speeding. There are different SLDs for different types of engines: For Mechanically Controlled (Cable controlled fuel lever) Engines, there are two types: Motor Actuator Type (Ct-9) SLD which controls the movement of the Mechanical Injection Pump Lever to limit the fuel input to restrict the maximum speed by means of a DC Motor and Fuel Control Type (LUC-9, LUC-99) that limits the fuel input to the pump by means of a solenoid valve which is fitted in the fuel line between the filter and the pump.
For Electronically Controlled Engines, Electronic Pedal Interface (FBW-99, FBW-99/KEN) is used which limits speed of the vehicle by modifying the position signals of the Electronic Accelerator Pedal to the ECM of the vehicle. The SLD has easily programmable speed functions and can detect a disconnected device. It ensures that no short circuit occurs on reverse polarity and provides tamper- proof circuitry. The advanced version also encompasses features such as speed data recording, real-time clock for easy report generation with date & time stamp, in-built buzzer for over-speed or device connect alerts, etc. and USB Interface for data downloading.
The SLDs have been tested and approved for fitting on more than 250 models (1000 variants) of commercial vehicles. The company has more than six years of experience in manufacturing and supply of the SLDs and till date more than 1.5 Lakhs vehicles have been retro-fitted with them.
The SLDs for both mechanically & electronically controlled engines conform to national standards: AIS 018 2011 laid by the Automotive Research Association Of India, Pune, AIS 37 which conforms Type Approval Certificate and Conformity of Production as per the rule 124 of CMVR. GSO 1626 / 2002. It also meets international standards such as ESMA, UAE & KS 2295-1:2011 of the Kenya Bureau of Standards (KEBS) standards.
Besides limiting the top speed of the vehicle to a set speed, it ensures full power to the engine till set speed is achieved. Since higher speeds are less fuel efficient, governing speed to ideal limits results in better fuel efficiency and savings, lesser fuel consumption, reduction in greenhouse gas emissions, enhances engine life & performance, increases tyre life and reduces operation & maintenance cost.