Turbocharged engines are becoming a trend. The highest performance assemblies typically use two turbochargers in series to increase performance requirements. The new Mannheimer Compressor Globe Valve enables Jaguar's 3.0-litre V6 diesel engine to achieve a smooth transition from single-turbo to dual-turbo mode without the need for shock pulses.
Man Hummel's new compressor stop valve is more in line with the development trend of smaller engine capacity and continuous improvement of performance. The use of turbochargers or compressors not only reduces fuel consumption but also improves performance. Take Jaguar's new 3.0-litre V6 diesel engine as an example. Under the full load condition, the first uninterrupted active turbocharger will drive the second turbocharger. This function is controlled by Man Humeer's new compressor shut-off valve, which is located between the two cylinder plates of the V-engine. The two turbocharger tubes of the engine merge in front of the charge cooler.
In partial load mode, the engine will only use the larger of the two turbines. If the actuator is pressed against the accelerator, the system pressure will increase. When the pressure of the second turbine exceeds the pressure of the first turbine, the pressure balance valve will open. This means that the engine does not need a shock pulse to achieve a smooth transition from a single turbine to a dual turbine mode. The vacuum actuator completely brings the valve into the open position, ensuring no flow resistance or mechanical vibration.
Man Humeel's new compressor shut-off valve allows the second turbocharger to start or stop at 0.1 seconds. This ensures that the engine responds in a timely manner and that the torque increases steadily up to 600 Newton meters.
The high performance of the Jaguar turbocharged diesel engine assembly is reflected in the higher requirements for heat resistance. This is why the components in front of the charge air cooler should be resistant to thermal shock. The temperature of the flow zone reaches a constant temperature of 180oC, and can reach 200oC in a short period of time, and the ambient temperature can reach 150oC. The above components must also be able to withstand an overpressure of 0.2 MPa.
After thorough testing, the design engineer decided to use aluminum and steel components that can withstand this high mechanical load. In this regard, MANN+HUMMEL combines the expertise of producing active intake manifolds with the technology used to produce oil modules. The steel valve shaft is located in the pressed-in continuous-lubricated sintered bronze sleeve. The forming gasket between the housing parts and the sealing ring on the valve shaft prevent the oil mist from running out and stop the system from drawing in the secondary air intake.
In the future, MANN+HUMMEL also plans to produce inflatable valves as plastic mixing parts. Development engineers are examining the limits of applicable materials through relevant tests.
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