EOL Test Stands for Truck Gas and Diesel Engines

For a Chinese OEM, JW Froehlich developed two identical cold test stands to test both heavy-duty diesel engines with displacements of 8, 9, and 11 liters, as well as CNG engines with displacements of 8 and 11 liters. Technically equipped and outfitted with various adapters, the test stands can handle up to 20 different engine types with displacements of up to 13 liters (cycle time: 150 seconds). The production line is not directly connected to the test stand, ensuring that production can continue even in the event of a test stand outage. A pull-in system and a sliding table that allows the test object to be moved onto the machine bed help save valuable cycle time, as does filling the fuel system while another prepared engine is tested. 

The test stands can accommodate heavy-duty engines weighing up to one ton, while the system can transport workpieces of up to four tons on the sliding table. Due to the high torque involved in testing, a particularly stable mechanical construction was implemented, allowing for structure-borne noise measurements at both 800 rpm and 1800 rpm, making turbocharger testing possible. 

The Chinese customer was seeking an end-of-line testing system that provided high testing quality for numerous engine variants while maintaining low investment and operating costs. After two local companies were unable to meet these requirements, the engine manufacturer turned to JW Froehlich. The solution was developed in close collaboration with the customer, with many specifications defined after the initial contract was awarded, allowing for an open-ended and flexible working approach throughout the entire process. 

JW Froehlich’s advanced cold test technology requires no fuel and produces no emissions. The result: reduced environmental impact, shorter test times, a lower hot test rate, and ultimately, lower operating costs. Thanks to the high flexibility of the test stand, the need for numerous individual systems for different engine types was eliminated, with only two cold test stands being ordered instead. This significantly reduced investment costs.