초록 ▼

A cooling system is disclosed. The cooling system may have a heat source, a heat exchanger, and a coolant pump located between the heat exchanger and the heat source to direct coolant from the heat exchanger to the heat source. The cooling system may also have a valve located between the heat source

A cooling system is disclosed. The cooling system may have a heat source, a heat exchanger, and a coolant pump located between the heat exchanger and the heat source to direct coolant from the heat exchanger to the heat source. The cooling system may also have a valve located between the heat source and the heat exchanger. The valve may be movable to vary a rate of coolant flow through the heat exchanger and around the heat exchanger to the coolant pump. The cooling system may further have a sensor located at an inlet of the heat source to generate a signal indicative of coolant temperature at the inlet, and a controller in communication with the valve and the sensor. The controller may be configured to move the valve based on the temperature of the coolant at only the inlet of the heat source.

대표청구항 ▼

1. A cooling system, comprising: a heat source;a heat exchanger;a coolant pump located between the heat exchanger and the heat source to direct coolant from the heat exchanger to the heat source;a valve located between the heat source and the heat exchanger, the valve being movable to vary a rate of

1. A cooling system, comprising: a heat source;a heat exchanger;a coolant pump located between the heat exchanger and the heat source to direct coolant from the heat exchanger to the heat source;a valve located between the heat source and the heat exchanger, the valve being movable to vary a rate of coolant flow through the heat exchanger and around the heat exchanger to the coolant pump;a sensor located at an inlet of the heat source to generate a signal indicative of coolant temperature at the inlet;a memory storing software adapted to execute a plurality of different operating modes, wherein a predetermined start-up mode temperature and a predetermined regulated mode temperature range are stored in the memory, with the predetermined start-up mode temperature being less than a lower limit of the predetermined regulated mode temperature range; anda controller in communication with the valve, sensor and memory, the controller being configured to move the valve based on the temperature of the coolant at only the inlet of the heat source and the operating mode,wherein the plurality of different operating modes includes a start-up mode when the coolant temperature is less than the predetermined start-up mode temperature, in which the controller actuates the valve to a fixed, partially open position which causes a majority of the coolant to flow around the heat exchanger while some of the coolant flows through the heat exchanger for all coolant temperatures that are less than the predetermined start-up mode temperature, and a regulated mode when the coolant temperature is greater than the predetermined start-up mode temperature, in which the controller modulates a position of the valve to maintain the coolant temperature within the predetermined regulated mode temperature range;wherein the controller is programmed to initially operate in the start-up mode when the coolant temperature is less than the predetermined start-up mode temperature; andwherein the controller is programmed to switch from the start-up mode to the regulated mode when the coolant temperature is greater than the predetermined start-up mode temperature. 2. The cooling system of claim 1, wherein the heat source is an internal combustion engine. 3. The cooling system of claim 2, wherein: the internal combustion engine includes an oil cooler located upstream of an engine block; andthe sensor is located at an inlet of the oil cooler. 4. The cooling system of claim 1, wherein the valve is electronically actuated. 5. The cooling system of claim 1, wherein the valve may be manually moved to control the coolant flow through the heat exchanger and around the heat exchanger in the event of electrical system failure. 6. The cooling system of claim 1, wherein at least some coolant is always passed through the heat exchanger. 7. The cooling system of claim 1, wherein the plurality of operating modes further includes a shutdown mode. 8. The cooling system of claim 7, wherein the shutdown mode includes a first shutdown mode corresponding with a delayed cool down of the heat source, and the controller is configured to move the valve to pass a majority of coolant around the heat exchanger to the coolant pump during the first shutdown mode. 9. The cooling system of claim 8, wherein the shutdown mode includes a second shutdown mode corresponding with a rapid cool down of the heat source, and the controller is configured to move the valve to pass a majority of coolant through the heat exchanger to the coolant pump during the shutdown mode. 10. The cooling system of claim 9, wherein the first and second shutdown modes are operator selectable. 11. A power unit, comprising: an engine having an oil cooler fluidly connected upstream of an engine block;a high temperature radiator;a first stage aftercooler fluidly connected between the engine block and the high temperature radiator;a first coolant pump located between the high temperature radiator and the oil cooler to direct coolant from the high temperature radiator to the oil cooler;a first bypass valve located between the first stage aftercooler and the high temperature radiator, the first bypass valve being movable to vary a rate of coolant flow through the high temperature radiator and around the high temperature radiator to the first coolant pump;a first sensor located at an inlet of the oil cooler to generate a signal indicative of coolant temperature at the inlet;a controller in communication with the first bypass valve and the first sensor, the controller being configured to move the first bypass valve based on the temperature of the coolant at only the inlet of the oil cooler;a second stage aftercooler fluidly connected to receive a flow of air from the first stage aftercooler;a low temperature radiator connected to receive coolant from the second stage aftercooler;a second coolant pump located between the low temperature radiator and the second stage aftercooler to direct coolant from the low temperature radiator to the second stage aftercooler;a second bypass valve located between the second stage aftercooler and the low temperature radiator, the second bypass valve being movable to vary a rate of coolant flow through the low temperature radiator and around the low temperature radiator to the second coolant pump; anda second sensor located at an entrance of the second stage aftercooler;wherein the controller is in further communication with the second bypass valve and the second sensor, the controller being configured to move the second bypass valve based on the temperature of the coolant at only the inlet of the second stage aftercooler. 12. A cooling system, comprising: a heat source;a heat exchanger;a coolant pump located between the heat exchanger and the heat source to direct coolant from the heat exchanger to the heat source;a valve located between the heat source and the heat exchanger, the valve being movable to vary a rate of coolant flow through the heat exchanger and around the heat exchanger to the coolant pump;a sensor located at an inlet of the heat source to generate a signal indicative of coolant temperature at the inlet;a memory storing software adapted to execute a plurality of different operating modes; anda controller in communication with the heat source, the valve, the sensor and the memory, the controller being configured to detect an operational status of the heat source,the controller being configured to operate the cooling system in a shutdown mode in response to determining that the operational status of the heat source changes from a on status to an off status,wherein the shutdown mode includes a first shutdown mode corresponding with a delayed cool down of the heat source, and the controller is configured to move the valve to pass a majority of coolant around the heat exchanger to the coolant pump during the first shutdown mode, andwherein the shutdown mode includes a second shutdown mode corresponding with a rapid cool down of the heat source, and the controller is configured to move the valve to pass a majority of coolant through the heat exchanger to the coolant pump during the shutdown mode. 13. The cooling system of claim 12, wherein the first and second shutdown modes are operator selectable.