Jacobs Vehicle Systems’ High Power Density (HPD ) engine brake has entered production with a Chinese truck manufacturer.

This is the first OEM application of HPD, launched in 2016, to be announced.

The new Sinotruk Yellow River tractor unit, designed and manufactured by China National Heavy Duty Truck company (CNHTC), integrates Jacobs’ HPD technology in its 11- and 13-litre engines.

The latest-generation Yellow River tractor unit, primarily intended for long-haul applications, was launched in mid-September at the Olympic Sports Centre in Jinan, the capital of Shandong province. 

CNHTC’s 11- and 13-litre engines, designated MC11 and MC13 are modular designs, with six cylinders and turbocharging and have B10-rated (1.1 million-mile) reliability. The MC11 produces 453 horsepower at 1,900 rpm and 2,200 Nm of torque at 1,000 to 1,400 rpm; the MC13 produces 532 horsepower at 1,800 rpm and 2,500 Nm at 1,000 to 1,400 rpm. The HPD 1.5 Stroke-equipped MC11 and MC13 engines are expected to be used in other applications.  

Jacobs unveiled its HPD Engine Brake technology in 2016 in response to requests from global engine suppliers seeking high power density and an alternative to the driveline retarder. The company says HPD helps meet the need for stronger engine braking because fuel efficiency strategies have reduced the natural retarding effects of vehicle wind resistance and friction from engine, drive train and tyres.  

The company maintains HPD can deliver performance comparable to a driveline retarder, up to one-and-a-half times the braking performance of traditional compression release braking during the engine’s entire operating range and more than double the braking performance at lower rpm.

Jacobs modular HPD system allows OEMs to select different versions of the technology depending on the application.