Control system having variable-speed engine-drive fan
First Claim
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1. A control system for a machine having an engine, comprising:
- a cooling circuit;
a heat exchanger associated with the cooling circuit;
a sensor configured to generate a signal indicative of a temperature of the cooling circuit;
a fan mechanically driven by the engine to direct air through the heat exchanger; and
a controller in communication with the sensor and the engine, the controller configured to adjust a speed of the engine based on the signal by adjusting fueling of the engine by an amount related to a desired seed of the fan.
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Abstract
A control system for use with a machine having an engine is disclosed. The control system may have a cooling circuit, a heat exchanger associated with the cooling circuit, and a sensor configured to generate a signal indicative of a temperature of the cooling circuit. The cooling system may also have a fan mechanically driven by the engine to direct air through the cooling circuit, and a controller in communication with the sensor and the engine. The controller may be configured to adjust a speed of the engine based on the signal.
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Citations
18 Claims
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1. A control system for a machine having an engine, comprising:
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a cooling circuit; a heat exchanger associated with the cooling circuit; a sensor configured to generate a signal indicative of a temperature of the cooling circuit; a fan mechanically driven by the engine to direct air through the heat exchanger; and a controller in communication with the sensor and the engine, the controller configured to adjust a speed of the engine based on the signal by adjusting fueling of the engine by an amount related to a desired seed of the fan. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A control system for a machine having a transmission driven by an engine to rotate a traction device, the control system comprising:
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a sensor configured to generate a signal indicative of a desired change in engine speed; and a controller in communication with the sensor and the engine, the controller being configured to; determine, before implementation of the desired change in engine speed, an adjustment to the transmission based on the desired change in engine speed that maintains a substantially constant travel speed; and implement the adjustment at about the same time as the desired change in engine speed. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A method of cooling a machine system, comprising:
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generating a signal indicative of a temperature of the machine system; determining a desired cooling fan speed change based on the signal; determining an engine speed change required to produce the desired cooling fan speed change; determining, prior to implementation of the engine speed change, a transmission adjustment required to maintain a substantially constant travel speed during implementation of the engine speed change; and implementing the transmission adjustment at about the same time as the engine speed change. - View Dependent Claims (15, 16, 17)
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18. A machine, comprising:
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an engine configured to produce a mechanical output; a cooling circuit configured to circulate fluid through the engine; a heat exchanger associated with the cooling circuit; a fan mechanically driven by the engine to direct air through the heat exchanger; a sensor configured to generate a signal associated with a temperature of the engine; a traction device configured to receive a mechanical input and propel the machine; a transmission fluidly connecting the mechanical output to the mechanical input, the transmission including; a pump connected to the mechanical output of the engine; and a motor configured to receive pressurized fluid from the pump and being connected to the mechanical input of the traction device; and a controller in communication with the engine, the transmission, and the sensor, the controller being configured to; determine a first desired speed change of the engine based on the signal; determine a second desired speed change of the engine not associated with the signal; determine, prior to implementation of the first or second desired speed changes, a transmission adjustment required to maintain a substantially constant travel speed during implementation of a greater one of the first and second desired speed changes; and implement the transmission adjustment at about the same time as the greater one of the first and second desired speed changes.
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Specification