Abstract
Using a method of engine cooling that is independent of engine speed, it is possible to shorten the warm-up period, decrease emissions, improve cooling capacity at low engine speeds and transient loads, and increase the heating capacity. However, these benefits are countered by the substantially higher costs associated with electrical pumps as compared with mechanical pumps. Behr has succeeded in drastically reducing the pump’s energy input through the optimization of an external cooling system for a four-cylinder turbo-diesel production engine. Thus, the costs for a cooling system with an electrical pump can be lowered to such an extent that the benefits more than outweigh the additional costs involved.
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