SOLIHULL - Land Rover used an electronic unit injector for its new 2.5-liter five-cylinder diesel engine in the New Discovery.
The Land Rover technology was developed with Lucas Diesel Systems. Development started in 1993, under the code name of Storm.
The program was intended as a modular family of 4-, 5-, and 6-cylinder units. Only the 5 was eventually developed.
Many new diesels are being developed with a common rail system invented by Fiat and developed by Bosch.
They include the new Range Rover, due next year, which will have a new BMW V-6 diesel engine using the common rail technology.
The outgoing Discovery's direct injection diesel generates 111hp and 265 Nm of torque. The new electronic unit injection engine, called Td5, gives 136hp and 300 Nm.
Lucas' electronic injection method was central to the program. It was a proven technology in larger truck engines, and common rail technology was still under development when Storm decisions were being made.
The system uses an individual camshaft-driven plunger pump for each injector, with precise electronic control of fuel timing and period. A complete injection shot takes little more than 1th of a second.
The high pressure necessary for such precision is created directly and briefly within the injector itself. There are none of the problems associated with containing high pressure within a fuel rail, distribution pipes or connections.
In parallel with this system, Land Rover engineers developed a new engine control module, code-named 'Thunder.' It is programmed to understand the tolerances of each electronic injection unit and change them to achieve optimum combustion efficiency and exhaust cleanliness.
Land Rover engineers tested engines in the laboratory and on the road to the equivalent of 2.2 million miles, including 30,000 miles under full load, said Les Atkins, development manager, diesel engines.
Land Rover believes some of its tests were unique, including 25 hours at full speed at a harsh angle. 'Not that the average Land Rover customer would go anywhere near it,' Atkins said, 'but the military do crazy things like stopping on steep hills and we have to cater for everybody.'