Temperature responsive hydraulic derate
A work machine includes a mechanical arm and a hydraulic actuator coupled to the mechanical arm to move the arm between a first position and a second position. A valve is in fluid communication with the hydraulic actuator for supplying fluid to the hydraulic actuator. A pump is configured to discharge fluid to the valve. An engine is operatively connected to the pump. A coolant system is in thermal communication with the engine and includes a temperature sensor. A controller is in communication with the pump and the temperature sensor. The controller is configured to transmit a control signal to the pump to modify a flowrate of the pump and to adjust the flowrate of the pump in response to a signal from the temperature sensor that a temperature is at or above a set temperature value.
1. A work machine comprising:
a mechanical arm;
a hydraulic actuator coupled to the mechanical arm to move the arm between a first position and a second position;
a valve in fluid communication with the hydraulic actuator for supplying fluid to the hydraulic actuator;
a pump configured to discharge fluid to the valve;
an engine operatively connected to the pump;
a coolant system in thermal communication with the engine and including a temperature sensor; and
a controller in communication with the pump and the temperature sensor,
wherein the controller is configured to transmit a control signal to the pump to modify a flowrate of the pump, and wherein the controller is configured to derate the flowrate of the pump in response to a signal from the temperature sensor that a temperature is at or above a set temperature value, and wherein the derate amount increases as the temperature increases until reaching a pre-programmed maximum derate amount of approximately 10 percent of the flowrate.
2. The machine of claim 1 , wherein the controller is configured to derate the flowrate of the pump a first amount at the set temperature and to derate the flowrate of the pump a second amount above the set temperature, wherein the first amount is approximately 1 percent of the flowrate and the second amount is between approximately 2 percent and approximately 10 percent of the flowrate.
3. The machine of claim 1 , wherein the controller transmits the control signal to a flow control valve associated with the pump.
4. The machine of claim 1 , wherein the coolant system includes a coolant and the set temperature value is associated with the temperature of the coolant.
5. The machine of claim 4 , wherein the coolant system includes a radiator and the temperature sensor is configured to monitor the temperature of the coolant downstream of the engine and upstream of the radiator.
6. The machine of claim 1 , wherein the set temperature value is below a critical temperature value.
7. The machine of claim 1 , wherein the mechanical arm is connected to a work implement.
8. The machine of claim 1 , wherein the controller is an engine control unit.
9. A work machine comprising:
a mechanical arm;
a hydraulic actuator coupled to the mechanical arm to move the arm between a first position and a second position;
a valve in fluid communication with the hydraulic actuator for supplying fluid to the hydraulic actuator;
a pump configured to discharge fluid to the valve;
an engine operatively connected to the pump;
a coolant system in thermal communication with the engine and including temperature sensor; and
a controller in communication with the pump and the temperature sensor,
wherein the controller is configured to transmit a control signal to the pump to modify a flowrate of the pump, and wherein the controller is configured to adjust the flowrate of the pump between approximately 1 percent and approximately 10 percent in response to a signal from the temperature sensor that a temperature is at or above a set temperature value, wherein approximately 10 percent is a pre-programmed maximum derate value.
10. The machine of claim 9 , wherein the derate amount increases continuously between approximately 1 percent and approximately 10 percent as the temperature rises above the set temperature.
11. The machine of claim 9 , wherein the derate amount increases in increments of approximately 1 percent between approximately 1 percent and approximately 10 percent.
12. The machine of claim 9 , wherein the coolant system includes a coolant and the set temperature value is associated with the temperature of the coolant.
13. The machine of claim 9 , wherein the set temperature value is below a critical temperature value.
14. A method of reducing operating temperature of a work machine, the work machine including an engine, a coolant system, a temperature sensor, a hydraulic actuator, a hydraulic pump, and a controller for controlling the flow of the hydraulic pump, the method comprising:
receiving a flow request for the hydraulic pump;
converting the flow request to a pump displacement request associated with a hydraulic flow rate;
receiving a temperature value from the temperature sensor;
derating the pump displacement request when the temperature value is at or above a set temperature value to adjust the hydraulic flow, and capping the derating at a maximum amount of approximately 10 percent;
converting the adjusted pump displacement request to a pump control signal; and
outputting the pump control signal to the hydraulic pump.
15. The method of claim 14 , wherein the set temperature value is below a critical temperature value.
16. The method of claim 14 , wherein the temperature value is a coolant temperature.
17. The method of claim 14 , wherein the hydraulic flow is derated between approximately 1 percent and approximately 10 percent.
18. The method of claim 14 , wherein the flow request is at least partially based on a signal from a load sensing system.
19. The method of claim 14 , further comprising adjusting the displacement request based on an operating mode input from a user.