The trends towards increasing engine performance and downsizing lead to an ever greater share of turbo-charged engines for passenger cars. Today, engines are generally charged with cooled air. The higher charge air density achieved by this increases performance and efficiency of the engine. However, not just the share of turbo-charged engines is increasing but - due to the continuous requirements for reduced consumption and emissions - also the requirements for intercooling capacities. This may be provided by cooling the charge air with a coolant instead of cooling with air.
Because of the system costs, that technology was previously used only in the higher-priced passenger car segment. New developments also enable regulation of the intercooling. This means that HC emissions can be reduced in addition to the reduction of the NOx emissions and the efficiency of the exhaust gas final treatment can be improved.
In addition to improved cooling capacity, another demand is made on intercooling: temperature control of the engine process air via intercooling control.
The temperature regulation becomes necessary due to the constantly increasing requirements on exhaust gas final treatment. There, the temperature of the charge air plays an important part. Thus, the cooling of the charge air with coolant offers decisive advantages even in commercial vehicles.
Air cooled and coolant cooled. Direct and indirect.
Increased engine output through increasing charge air density (more combustion air, greater oxygen share).
- Increased dynamic cooling capacity
- Improved engine efficiency due to increase in charge air density
- Reduced combustion temperature leading to improved emission values
- Fewer nitrogen oxides between -40 °C and 160 °C
- Test pressure = 20 bar with a bursting pressure of 50 bar