Speed Limiting Device - SLD
Apr 6th, 2009 by admin
Speed Limiting Device: DC Motor SLD
1. Components: DC Motor Unit, ECU, Booster (not necessary), Spring Rod Assembly
2. Modification in the assembly: In the current assembly of Accelerator pedal and FIP, the inner rod of spring rod assembly is directly connected to the FIP so that when the accelerator pedal is pressed, it will directly control the opening the fuel valve. Now with SLD, some changes have been made with spring rod assembly and now the accelerator pedal is connected to FIP through outer of spring rod assembly. Now the outer of the spring rod assembly is divided into two parts and not a single body as it was in the current situation without SLD.
3. Input of each component:
1. ECU: It receives speed signal (when there is no booster) either from vehicle speed sensor or separate speed sensor (which receives speed signal from rotation cable of mechanical speedometer) and power by taping IG from combination switch.
2. Booster: This is not a mandatory component and if it is present, then it receives signal from vehicle speed sensor or separate speed sensor (which receives speed signal from rotation cable of mechanical speedometer) and power by taping IG from combination switch.
3. DC Motor Unit: It receives signal from ECU when the vehicle exceeds the speed programmed in the ECU. And ECU completely drives the DC motor and supplies the power when the Vehicle exceeds speed which is already set in the ECU.
4. Opreation: ECU is programmed according to the speed limit. It receives the speed pulse from either vehicle speed sensor or speed sensor of the SLD assembly. When booster is used in between speed sensor and ECU, booster receives the speed pulse from the sensor and boost up the level of pulse so that ECU will receive a strong pulse. ECU is programmed at two speed limits: One is activation speed and other is limiting speed. At activation speed, ECU will activate the motor and at limiting speed, motor will start working to limit the speed. For example: if the limiting speed is 40 km/hr, then activation speed may be 35 km/hr. Below the limiting speed, FIP is directly controlled by the accelerator pedal but when the vehicle exceeds the limiting speed, ECU will activate the DC motor and control the opening of the fuel valve by increasing the length of the inner rod. When the speed of the vehicle falls below the activation speed (35 km/hr), the motor will be deactivated. The length of the inner rod will be decreased and then controls come to the accelerator pedal again.