Internal-combustion engines – Cooling – Interrelated coolant flow and throttle control
Patent
1996-03-22
1997-09-23
Kamen, Noah P.
Internal-combustion engines
Cooling
Interrelated coolant flow and throttle control
123 4129, 123 4131, 123196AB, F01P 714
Patent
active
056693354
ABSTRACT:
A temperature control system, in a liquid cooled internal combustion engine equipped with a radiator, controls the state of a flow control valve for controlling flow of a temperature control fluid through a passageway leading to the radiator. Sensors detect the engine operation temperature, the temperature of the temperature control fluid, t1, and the ambient air temperature, t2. An engine computer receives signals from the sensors, produces control signals based on both of the sensor signals, and sends the control signals to the flow control valve to control the state of the valve. The values t1 and t2 define a plurality of mathematical functions of t1=f(t2) which form a plurality of two-dimensional curves on an orthogonal coordinate system having axes t1 and t2. Each of the curves divide the coordinate system into two regions, one on either side of the curve. The engine computer control signals prevent flow through the valve when coordinate pairs of t1 and t2 lie on a first region of the coordinate system and allow the flow when coordinate pairs of t1 and t2 lie on a second region of the coordinate system. The engine computer receives a measurement of the actual engine operational temperature, compares it to an optimum engine operation temperature, and selects an appropriate curve based on the comparison.
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Automotive Encyclopedia, Engine Lubrication, Chapter 16, pp. 161-168; Chapter 17, Engine Cooling Systems, pp. 169-185.
Hollis Thomas J.
Kamen Noah P.
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