System and method for regulating coolant flow rate to a heat exchanger

A method for regulating coolant flow rate to a heat exchanger in an automotive vehicle having an engine operating at different speeds comprising the steps of:

• providing a main fluid pump for providing a source of fluid under pressure to the engine and the heat exchanger;
• providing a reversible flow auxiliary pump disposed between main fluid pump and the heat exchanger;
• measuring engine speed and generating an engine speed signal;
• measuring ambient temperature and generating an ambient temperature signal;
• and
• activating the auxiliary pump to force fluid against the flow from said main fluid pump when the engine speed signal is greater than a threshold value and to force fluid to the heat exchanger when the ambient temperature signal is below a predetermined value and the engine speed signal is less than the threshold value and within predetermined values.

A system for regulating coolant flow rate to a heat exchanger in an automotive vehicle having an engine operating at different speeds, comprising:

• a main fluid pump for providing a source of fluid under pressure to the engine and the heat exchanger;
• a reversible flow auxiliary pump disposed between the main fluid pump and the heat exchanger;
• means for measuring engine speed and generating an engine speed signal;
• means for measuring ambient temperature and generating an ambient temperature signal;
• and
• control means for receiving said engine speed signal and said ambient temperature signal and activating the auxiliary pump to force fluid against the flow from said main fluid pump when the engine speed signal is greater than a threshold value and to force fluid to the heat exchanger when the ambient temperature signal is below a predetermined value and the engine speed signal is less than the threshold value and within predetermined values.