![]() “ADT is another development of Jacobs’ well-proven valve actuation technologies to deliver another set of benefits,” said Steve Ernest, vice president of engineering and business development at Jacobs Vehicle Systems. When high cranking speed is reached, the engine compression is reactivated and cylinder-fueling begins. When combined with supplemental air inlet heaters, ADT also enables the engine cylinders to be pre-warmed without the engine load from compression especially useful when freezing temperatures have reduced battery levels. Jacobs says extensive testing has shown that ADT reduces the magnitude of engine-shake during shutdown by 90%, which is when vibrations transmitted to the cabin are of greatest frequency and strength.īy enabling the engine to be turned-over while decompressed, ADT also improves start-ups in cold temperatures by enabling the engine to reach its critical compression ignition speeds. ![]() This can also allow the use of smaller and lighter batteries, cables, and starter. When starting up, the engine is kept in a decompressed state which decreases cranking torque by 40% and allows the engine to spin up to twice its normal speed for smoother starting, faster priming of the fuel system, and decreased wear on the starter gear, fly wheel and other components. When switching off the engine, it “coasts” to a smooth shutdown without causing the cab to shake. The ADT device is automatically activated by the engine control unit (ECU) whenever the engine shuts down or starts up, and works by keeping the engine valves open and the cylinders decompressed.
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