Brake Cooling Pump Control for Dump Truck Brake Test Mode
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Solution Overview
Problem
Existing brake cooling systems in work vehicles face issues with increased fuel consumption due to friction-generated heat and inefficient cooling, and existing health determination methods for hydraulic circuits are inadequate, particularly when oil temperature remains low.
Innovation Solution
A work vehicle equipped with a brake device that uses cooling oil to cool a rotating member, a pump that adjusts its rotation speed based on temperature and pressure sensor feedback, and a controller to manage the pump's speed for normal operation and brake test modes, ensuring efficient cooling and health determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a large amount of cooling oil is circulated in the brake cooling circuit to effectively cool the rotating member, then the temperature increase in the brake device is suppressed, but a loss in driving force occurs due to transmission of driving force from the output shaft to the cooling oil
Solution Approach 1:
The pump rotation speed is dynamically adjusted based on the detected temperature of the cooling oil. When the temperature is high, the pump rotation speed is increased to enhance cooling; when the temperature is low, the pump rotation speed is reduced to minimize driving force loss. This dynamic adjustment resolves the contradiction between effective cooling and energy efficiency.
Solution Approach 2:
The system changes the operating parameters (pump rotation speed) based on the temperature conditions. By adjusting the pump rotation speed according to the detected cooling oil temperature, the system optimizes the balance between cooling effectiveness and driving force loss, transforming a static system into one that adapts to varying thermal conditions.
2Loss of energy
If the pump rotation speed is reduced to minimize driving force loss, then fuel consumption is reduced, but the cooling effectiveness decreases and the temperature of the rotating member increases
Solution Approach 1:
The system uses a temperature sensor to detect the cooling oil temperature and feeds this information back to the controller, which adjusts the pump rotation speed accordingly. This feedback mechanism ensures that the pump rotation speed is optimized based on actual thermal conditions, preventing both excessive cooling (energy waste) and insufficient cooling (overheating).
3Loss of energy
If the flow rate of hydraulic fluid is reduced for fuel efficiency, then the circuit pressure becomes insufficient for pressure sensor detection, but health determination of the circuit becomes difficult
Solution Approach 1:
The system dynamically adjusts the pump rotation speed based on operational mode. During normal operation, the pump runs at reduced speed for fuel efficiency. During inspection mode, the pump rotation speed is increased to generate sufficient circuit pressure for accurate pressure sensor detection, enabling health determination without compromising normal fuel efficiency.
4Reliability
If the pump rotation speed is increased to ensure sufficient circuit pressure for health determination, then the health of the brake cooling circuit can be determined, but fuel consumption increases
Solution Approach 1:
The system uses periodic inspection mode where the pump rotation speed is temporarily increased at scheduled intervals or when inspection is required, rather than maintaining high rotation speed continuously. This periodic high-speed operation enables health determination while minimizing overall fuel consumption during normal operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system reduces fuel consumption during normal operation while effectively determining the health of the brake cooling circuit by increasing pump speed during inspections, thereby optimizing cooling efficiency and reliability.
Implementation Method 1
hydraulic fluid for cooling is circulated between the fixed member and the rotating member to cool the rotating member, thereby suppressing the temperature increase in the rotating member
Implementation Method 2
a pump that supplies the cooling oil in an amount corresponding to a rotation speed to the brake device
Implementation Method 3
a pressure sensor that detects a pressure of the cooling oil
Implementation Method 4
a temperature sensor that detects a temperature of the cooling oil
Implementation Method 5
a brake device that generates a braking force through a press contact between a rotating member rotating together with an output shaft and a fixed member fixed to a body side
Data Source
AI summary
Provided is such control that a delivery flow rate of a cooling pump increases as the temperature of cooling oil detected by a temperature sensor increases, and, in a case in which an operation mode of a dump truck is switched from a normal mode for executing work involving an operation of a brake device to a brake test mode for determining health of the brake device, provided is such control that the rotation speed of the cooling pump is higher in the brake test mode than that in the normal mode with respect to the temperature of the cooling oil detected by the temperature sensor in at least a part of the temperature range, it is determined whether an abnormality is occurring or not in the brake device on the basis of the detection result from the pressure sensor in the brake test mode, and abnormality occurrence information is output in a case in which an abnormality is determined to be occurring. With this configuration, fuel consumption can be reduced at the normal time, and the health of a brake cooling circuit can be determined at an inspection time for the circuit.