EP0557113A2
Expired / Lapsed
EP
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Engine cooling system
Assignee: Honda Motor Co Ltd
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Filing: 1993-02-19
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Granted: —
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Expires: 2013-02-19
Abstract
Abstract An engine cooling system comprises a cooling water circulation circuit (1) interconnecting an engine body (E) and a radiator (R), a bypass circuit connected to the cooling water circulation circuit (1) to bypass the radiator (R), an electric-powered water pump (4) disposed in the cooling water circulation circuit (1) adjacent an engine inlet, a flow rate control valve (3) for controlling the flow rate of cooling water flowing through the radiator (R), an engine outlet water temperature detector (15), an engine inlet water temperature detector (16), and means for controlling the operation of the water pump (4) in accordance with at least the engine outlet water temperature and controlling the operation of the flow rate control valve (3) in accordance with at least the engine inlet water temperature to thereby properly control the temperature of the cooling water in accordance with the operational condition of the engine (E). In a knocking mode a target engine outlet water temperature for controlling the pump (4) may be reduced to reduce the temperature difference between the engine inlet and outlet temperatures, and in a post-stoppage mode the pump may be controlled by an open loop based on the engine outlet water temperature. The control valve (3) may be controlled on the basis of the engine inlet or outlet water temperatures depending on the water temperature and engine load.
Inventors
- 👤 Hidehito c/o Kabushiki Kaisha Honda Ikebe
- 👤 Hiroyuki c/o Kabushiki Kaisha Honda Niikura
- 👤 Masaaki c/o Kabushiki Kaisha Honda Hiratani
- 👤 Hiroo c/o Kabushiki Kaisha Honda Shimada
- 👤 Koji c/o Kabushiki Kaisha Honda Okazaki
- 👤 Toshio c/o Kabushiki Kaisha Honda Yokoyama
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 10:05
CPC Classifications
F; F01; F01P; F01P7/00; F01P7/14; F01P7/16; F01P7/164; F01P7/167; F01P5/00; F01P5/10; F01P5/12; F01P2005/125; F01P2007/143; F01P2025/00; F01P2025/08; F01P2025/12; F01P2025/13; F01P2025/30; F01P2025/32; F01P2025/36; F01P2025/40; F01P2025/52; F01P2025/60; F01P2025/62; F01P2025/64; F01P2031/00; F01P2031/30; F01P2060/00; F01P2060/04; F01P2060/045; F01P2060/08
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
143 words
An engine cooling system comprising a cooling water circulation circuit interconnecting an engine body and a radiator, a bypass circuit connected to the cooling water circulation circuit to bypass the radiator, an electric-powered variable displacement water pump disposed in the cooling water circulating circuit adjacent an engine inlet, a flow rate control valve for controlling the flow rate of cooling water flowing through the radiator, an outlet water temperature detector for detecting an engine outlet water temperature in the cooling water circulation circuit, an inlet water temperature detector for detecting an engine inlet water temperature in the cooling water circulation circuit, and a control means for controlling the operation of the water pump in accordance with at least the engine outlet water temperature and controlling the operation of the flow rate control valve in accordance with at least the engine inlet water temperature.
Claim 2
Dependent Claim
51 words
An engine cooling system according to claim 1, wherein said control means controls the water pump and the flow rate control valve in accordance with the engine outlet and inlet water temperatures and an operational condition of the engine, other than said water temperatures, including at least the engine revolution number.
Claim 3
Dependent Claim
87 words
An engine cooling system according to claim 1 or 2, wherein said control means is capable of performing a feed-back control of the water pump operation using, as a target value, a target outlet water temperature determined from at least the engine revolution number and the engine intake pressure as parameters, and performing a feed-back control of the flow rate control valve using, as a target value, a target inlet water temperature determined from at least the engine revolution number and the engine intake pressure as parameters.
Claim 4
Dependent Claim
84 words
An engine cooling system according to claim 3, wherein said control means is capable of being switched over between a state for performing the feed-back control of the water pump, when the engine outlet water temperature is equal to or higher than a reference water temperature, and an open loop control of the water pump using a control value based on the engine outlet water temperature and the engine intake pressure, when the engine outlet water temperature is lower than said reference water temperature.
Claim 5
Dependent Claim
43 words
An engine cooling system according to claim 3 or 4, wherein said control means varies the gain in the feedback control of the flow rate control valve in accordance with the temperature of water in the radiator and the engine inlet water temperature.
Claim 6
Dependent Claim
89 words
An engine cooling system comprising a cooling water circulation circuit interconnecting an engine body and a radiator, an electric-powered variable displacement water pump disposed in the cooling water circulation circuit adjacent an engine inlet, a water temperature detector for detecting an engine water temperature, and a control means for controlling the operation of the water pump in such a manner to switch-over a feed-back control according to the engine water temperature and an open loop control from one to another in accordance with the operational condition of an engine.
Claim 7
Dependent Claim
64 words
An engine cooling system according to claim 6, wherein said control means is capable of being switched over between a state for performing the feed-back control, when the engine water temperature is equal to or higher than a predetermined reference water temperature, and a state for performing the open loop control, when the engine water temperature is lower than said predetermined reference water temperature.
Claim 8
Dependent Claim
61 words
An engine cooling system according to claim 7, wherein said control means has a control value previously set therein in correspondence to an acceptable minimum displacement of the water pump, which insures a substantially uniform flowing of cooling water within the engine body in conducting the open loop control, when the engine water temperature is lower than said reference water temperature.
Claim 9
Dependent Claim
45 words
An engine cooling system according to claim 6, 7 or 8, wherein said control means performs the open loop control of the water pump using the control value continuously varied in accordance with the engine water temperature, when the operation of the engine is stopped.
Claim 10
Dependent Claim
92 words
An engine cooling system comprising a cooling water circulation circuit interconnecting an engine body and a radiator, an electric-powered variable displacement water pump disposed in said cooling water circulation circuit adjacent an engine inlet, an engine outlet water temperature detector for detecting an engine outlet water temperature, a knocking detector for detecting the knocking of the engine, and a control means capable of performing a feed-back control of the water pump in accordance with the engine outlet water temperature and reducing a target value for the feed-back control, when knocking is detected.
Claim 11
Dependent Claim
145 words
An engine cooling system comprising a cooling water circulation circuit interconnecting an engine body and a radiator, a variable flow rate control valve mounted in said cooling water circulation circuit, an engine inlet water temperature detector for detecting an engine inlet water temperature, an engine outlet water temperature detector for detecting an engine outlet water temperature, and a control means capable of being switched over between a state for controlling the opening degree of the variable flow rate control valve to bring the engine outlet water temperature into a target outlet temperature, when the engine inlet water temperature is in a low water temperature region, and a state for controlling the opening degree of the variable flow rate control valve to bring the engine inlet water temperature into a target inlet temperature, when the engine inlet water temperature is in a high water temperature region.
Claim 12
Dependent Claim
142 words
An engine cooling system according to claim 11, wherein a mean water temperature region is established between the low and high water temperature regions, and said control means is capable of being switched over between a state for controlling the opening degree of the variable flow rate control valve to bring the engine outlet water temperature into the target outlet temperature during the operation of the engine at a low load in a condition in which the engine inlet water temperature is in said mean water temperature region, and a state for controlling the opening degree of the variable flow rate control valve to bring the engine inlet water temperature into a target inlet temperature during the operation of the engine at a high load in a condition in which the engine inlet water temperature is in said mean water temperature region.
Claim 13
Dependent Claim
89 words
An engine cooling system according to claim 12, further including a knocking detector connected to said control means for detecting the knocking of the engine, and wherein said control means controls the opening degree of the variable flow rate control valve so as to reduce the target inlet temperature and reduce the difference between the engine outlet water temperature and the engine inlet water temperature in response to the detection of the knocking during the operation of the engine at a high load in the mean water temperature region.
Claim 14
Dependent Claim
42 words
An engine cooling system according to claim 11,12 or 13, wherein said variable flow rate control valve is mounted in the middle of a passage interconnecting an engine outlet and the radiator to constitute a portion of said cooling water circulation circuit.
Claim 15
Dependent Claim
107 words
An engine cooling system comprising a cooling water circulation circuit interconnecting an engine body and a radiator, means circulating cooling water in the cooling water circulation circuit an outlet water temperature detector for detecting an engine outlet water temperature in the cooling water circulation circuit, an inlet water temperature detector for detecting an engine inlet water temperature in the cooling water circulation circuit, and a control means for controlling the circulation of the cooling water through the engine body in response to both said detected temperatures for minimizing the temperature difference between said engine outlet water temperature and said engine inlet water temperature for minimizing engine knocking.
Claim 16
Dependent Claim
33 words
An engine cooling system according to claim 15, wherein said circulating means includes a water pump and flow rate control valve for controlling the rate of flow of cooling water through the radiator.
Claim 17
Dependent Claim
24 words
An engine cooling system according to claim 16, wherein said water pump includes means for selectively varying the rate of flow of cooling water.
Claim 18
Dependent Claim
51 words
An engine cooling system according to claim 17, wherein said control means controls the water pump and the flow rate control valve in accordance with the engine outlet and inlet water temperatures and an operational condition of the engine, including at least the engine revolution number, other than said water temperatures.
References Cited (Backward Citations)
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