Lucas's latest DPS
Page 24
If you've noticed an error in this article please click here to report it so we can fix it.
LUCAS CAV has revealed some details of its latest DPS rotary diesel-injection pump which has been developed to suit the highspeed direct-injection engines for light vans and cars.
The direct injection DPS will complement the existing indirect injection DPS model which is used on VW's Golf engine among others.
The new DPS has been extensively redesigned to cope with the high-injection pressures (as much as 700 bar) of small directinjection engines and to satisfy the performance requirements demanded by the new engines' manufacturers. Lucas CAV says the new pump will suit engine speeds of up to 4,500rpm.
Its drive shaft has been made stronger and a number of new features have been built into it. A two-stage torque control device allows the pump's fuel delivery to be tailored to suit various engines' torque curves.
An hydraulic excess fuel control gives "superior cold starting characteristics" says Lucas CAV and at cold idle a wax pellet thermostat increases idle speed to prevent stalling.
The same thermostat advances injection timing when the engine is cold to improve starting performance and reduce exhaust emissions.
The new DPS pump has a light load advance device and a servo unit to advance injection timing as engine speed increases.
Lucas CAV's Rotary Pump Engineering Centre at Gillingham, which was completed in 1982, was responsible for the development of the new DPS pump.