US 5,701,852 A · Coolant temperature control system for vehicles

Abstract

According to the present invention, coolant temperature Tw after an engine has stopped is detected by a coolant-temperature sensor. An amount of temperature rise .DELTA.Tw is calculated from a temperature difference between the present coolant temperature (Tw) and the previous coolant temperature (Tw-1). It is determined on the basis of the amount of temperature rise .DELTA.Tw whether coolant temperature after the engine has stopped has reached a substantially maximum temperature. Specifically, the amount of temperature rise .DELTA.Tw and a set amount of temperature rise .DELTA.T which has been set in advance are compared, and in a case where .DELTA.Tw>.DELTA.T, temperature rise is large and coolant temperature is still rising. Therefore, recovery of coolant is not performed. When .DELTA.Tw.ltoreq..DELTA.T, the amount of temperature rise is small and the present temperature is substantially the maximum temperature, and an electrical pump is operated to recover coolant. In this way, it is possible to recover a higher-temperature coolant into insulated container after the engine has stopped.

Claims17

Dependent claims

A coolant temperature control system for vehicles having an engine cooled by coolant, said control system comprising:

an insulated container connected to said engine;
a pump for pumping coolant from said engine to said insulated container;
means for detecting coolant temperature after said engine has stopped;
means for determining whether said coolant temperature after said engine has stopped has reached a substantially maximum temperature on a basis of a detected value of said coolant temperature detecting means;
and
a control unit in communication with said detecting means and said determining means for actuating said pump when it has been determined by said maximum temperature determining means that said coolant temperature has reached said substantially maximum temperature.

3 more elements

A coolant temperature control system for vehicles having an engine cooled by coolant, comprising:

an insulated container connected to said engine;
means for pumping coolant from said engine to said insulated container;
and
control means for actuating said coolant pumping means after said engine has stopped;
wherein said control means delays actuating said coolant pumping means for a specified period after said engine has stopped.

2 more elements

A coolant temperature control system for vehicles having a water-cooled engine cooled by coolant, comprising:

an insulated container connected to said engine;
means for pumping coolant from said engine to said heat insulating container;
and
control means for actuating said coolant pumping means after said engine has stopped,
wherein said control means actuates said coolant pumping means after a specified period has passed since said engine stopped.

2 more elements

Dependencies are inferred from the claim text.

Coolant temperature control system for vehicles

Life of this patent

Coolant temperature control system for vehicles

Life of this patent

Abstract

Claims17