The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 26, 1987
Filed:
Feb. 07, 1986
Yoshimasa Hayashi, Kamakura, JP;
Yoshinori Hirano, Yokohama, JP;
Nissan Motor Co., Ltd., Yokohama, JP;
Abstract
In order to avoid the need to provide auxiliary pumps and the like to obviate cavitation problems in the coolant return pump and the coolant jacket of an evaporative cooling type engine cooling system, a heater circulation pump which circulates heated coolant through a cabin heating circuit is selectively connected with a reservoir in which liquid coolant is stored and energized to pump fresh relatively cool coolant into the coolant jacket in the event that the normal coolant return pump is sensed as operating continuously for more than a predetermined period of time and thus ensure that the level of coolant in the coolant jacket is maintained at an appropriate level. Upon a positive pressure developing in the system a valve upstream of the coolant return pump is opened and hot coolant is displaced out to the reservoir. When a negative pressure develops the aforementioned valve is opened and fresh cool coolant from the reservoir is inducted into the system upstream of the pump to alleviate pump cavitation.