Abstract
The objective of the system is to control the car heater temperature to ensure an optimum comfort level, without the need for periodic adjustment, despite variations in ambient temperature and vehicle usage.
Reasons for choosing a particular type of system are explained.
The operation is analysed, and expressed in terms of an equation. Difficulties in solution due to non-linear terms are overcome with the aid of a digital computer.
Test data on the system components and vehicle characteristics are used in the computer program to obtain a prediction of the accuracy of temperature control over a wide range of operating conditions.
Predicted performance is compared with actual road tests results for an installation.
Design optimization is facilitated by using the computer to examine the effect of system parameter changes on the overall performance.
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