Application
High temperature endurance test (Thermal Life Test) of electric water pumps
Using this test scenario, a service life test of electric cooling water pumps from the automotive sector was carried out (so-called thermal life test). The ambient temperature was a constant 125 °C and the media temperature was 115 °C. Each test specimen was tested with a special medium and operated in a separate fluid circuit.
Thermal Life Test Requirements
The operating points of the test specimens were set before the start of the endurance test in order to make changes in the pump properties due to the load as visible as possible. So that cross-influences between the DUTs could be ruled out, a separate fluid circuit was provided for each test item and each pump was operated with its own power supply.
In this test run, particular attention was paid to the use of a special medium. In order not to falsify the following cooling water tests, the test circuits were separated from the test bench or system media via individual heat exchangers.
The pumps were operated with a speed profile specified by the customer. The pumps were controlled via LIN communication.
Monitoring and measurement variables
- Inlet pressure and differential pressure measurement
- Inlet and outlet temperatures of the individual pumps
- Ambient temperature
- Current and voltage measurement of the test items
- Bus communication return values
