|The new 3.0-liter CRD.|
A new 3.0-liter turbo Common Rail Diesel (CRD) will make its debut in the recently announced 2007 Jeep Grand Cherokee next year (earlier post).
The Mercedes-built 3.0-liter CRD produces 218 hp (160 kw) of power at 3,800 rpm and 510 Nm of torque at 2,000 rpm—33% more power and 28% more torque than its 2.8-liter predecessor previously offered in Europe. Built in Berlin, Germany, the new V-6 CRD engine is entering series production.
|Engine||6-cylinder, 72° V|
|Bore x stroke||83 x 92 mm|
|Power||218 hp (160 kW)|
Mercedes made enhancements to the engine design ranging from the mechanical system and airflow dynamics to the electronic engine management and emissions control.
The common rail direct-injection system has been refined, achieving greater progress in fuel consumption, exhaust emissions and combustion noise. Newly developed piezo injectors operate more rapidly than the previous solenoid injectors, ensuring a precisely metered fuel supply to the cylinders.
The piezo injectors are controlled for load and engine speed. Five injections per power stroke are now possible at peak pressures up to 1,600 bar (24,000 psi). This marks the first use of piezo injectors in a North American SUV, according to Chrysler.
Electrically actuated intake-port swirl valves modify the turbulence of the intake air as it enters the cylinders, optimizing the combustion process with the aim of further reducing fuel consumption and exhaust emissions. The new electronic control unit (ECU) manages all the engine functions—from the quick-start glow system and automatic start function to control of the high-pressure fuel pump.
A Variable Geometry Turbine (VGT) with electrically adjustable blades acts like a small turbocharger under launch conditions, but has the desirable characteristics of a larger turbocharger at higher engine speeds. The benefit to customers is enhanced response at low engine speeds.