THERMOSTAT MONITOR
First Claim
1. A thermostat monitor for detecting an open failure of a thermostat in an engine cooling water channel system, based on a temperature of an engine cooling water detected by a temperature sensor, the engine cooling water channel system having an engine, a heater core and a radiator of a vehicle positioned thereon, the engine cooling water channel system comprising an in-engine cooling water channel, a radiator-side cooling water channel and a heater core-side cooling water channel, the thermostat positioned on the radiator-side cooling water channel, and the temperature sensor positioned in the vicinity of an outlet of the in-engine cooling water channel,wherein the thermostat monitor comprises a thermostat open failure detecting part for detecting an occurrence of the open failure of the thermostat when a radiator heat radiation amount radiated from the radiator on the radiator-side cooling water channel is larger than a heater core heat radiation amount radiated from the heater core on the heater core-side cooling water channel, and when a difference between the radiator heat radiation amount and the heater core heat radiation amount is equal to or more than a predetermined value.
1 Assignment
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Accused Products
Abstract
Provided is a thermostat monitor (36) comprising a thermostat open failure detecting part (38) for detecting an open failure of a thermostat when a condition is such that a radiator heat radiation amount (14) radiated from a radiator on a radiator-side cooling water channel is larger than a heater core heat radiation amount (12) radiated from a heater core on a heater core-side cooling water channel, and that a difference between the radiator heat radiation amount and the heater core heat radiation amount is equal to or more than a predetermined value A. Based on a temperature of engine cooling water detected by a temperature sensor positioned in the vicinity of an outlet of an in-engine cooling water channel, it is possible to detect the open failure of the thermostat relatively easily with certainty.
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Citations
5 Claims
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1. A thermostat monitor for detecting an open failure of a thermostat in an engine cooling water channel system, based on a temperature of an engine cooling water detected by a temperature sensor, the engine cooling water channel system having an engine, a heater core and a radiator of a vehicle positioned thereon, the engine cooling water channel system comprising an in-engine cooling water channel, a radiator-side cooling water channel and a heater core-side cooling water channel, the thermostat positioned on the radiator-side cooling water channel, and the temperature sensor positioned in the vicinity of an outlet of the in-engine cooling water channel,
wherein the thermostat monitor comprises a thermostat open failure detecting part for detecting an occurrence of the open failure of the thermostat when a radiator heat radiation amount radiated from the radiator on the radiator-side cooling water channel is larger than a heater core heat radiation amount radiated from the heater core on the heater core-side cooling water channel, and when a difference between the radiator heat radiation amount and the heater core heat radiation amount is equal to or more than a predetermined value.
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3. A thermostat monitor for detecting an open failure of a thermostat in an engine cooling water channel system, based on a temperature of an engine cooling water detected by a temperature sensor, the engine cooling water channel system having an engine, a heater core and a radiator of a vehicle positioned thereon, the engine cooling water channel system comprising an in-engine cooling water channel, a radiator-side cooling water channel and a heater core-side cooling water channel, the thermostat positioned on the radiator-side cooling water channel, and the temperature sensor positioned in the vicinity of an outlet of the in-engine cooling water channel,
wherein the thermostat monitor comprises a temperature difference determining part for having the detection of the open failure of the thermostat started when a condition is met such that a temperature difference between the temperature of the engine cooling water detected by the temperature sensor and external air temperature is equal to or more than a predetermined value.
Specification