Hydraulic Oil Temperature Control for Cold-Start Machine Operation
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Solution Overview
Problem
Power machines with hydraulic systems face performance degradation and component damage when operating in cold temperature conditions due to low hydraulic oil temperatures, leading to undesirable results.
Innovation Solution
Defining hydraulic temperature zones of operation based on measured oil temperatures and controlling the hydraulic system accordingly, allowing restricted or full operation depending on the zone, with multiple or single set point temperatures to manage oil temperature effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the hydraulic system operates in cold temperature conditions, then the power machine can function in a wider range of environments, but the hydraulic oil temperature is too low causing performance degradation and component damage
Solution Approach 1:
The control system performs preliminary assessment of hydraulic oil temperature before allowing full system operation. When cold temperature conditions are detected, the system restricts hydraulic functions until temperature reaches acceptable levels, preventing operation under harmful conditions and eliminating the need for recovery actions later
Solution Approach 2:
The control system continuously monitors hydraulic oil temperature and uses this feedback to dynamically adjust system operation. Temperature sensors provide real-time data to the control unit, which modifies hydraulic function availability based on current temperature conditions, creating a closed-loop control system that adapts to thermal conditions
2Reliability
If the hydraulic system is restricted in cold temperatures, then component damage is prevented, but system productivity and operation capability are reduced
Solution Approach 1:
The control system dynamically adjusts hydraulic function availability based on real-time temperature conditions rather than using fixed restrictions. As temperature increases, the system progressively enables additional hydraulic functions, optimizing the balance between component protection and productivity based on current thermal conditions
Solution Approach 2:
The control system changes operational parameters (such as maximum hydraulic flow, pressure limits, or function availability) based on temperature measurements. By adjusting these parameters dynamically, the system maintains component protection while maximizing productivity within safe thermal boundaries
Data Source
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AI summary
Power machines (100; 200; 350) having hydraulic systems (300) and controllers (320) configured to prohibit, limit, or allow full operation of the hydraulic systems based upon measured temperature of the hydraulic oil in the system are provided. Also included are methods (400; 500) of controlling the hydraulic systems. In the methods implemented by the controllers, determinations (406; 410; 506) are made as to whether the temperature of the hydraulic oil is below a first (and lowest) set point temperature, above a second (and higher) set point temperature, or between the first and second set point temperatures. The controllers then either prohibit hydraulic system operation, allow limited hydraulic system operation, or allow full hydraulic system operation, based upon the measured temperature in comparison to the two or more set point temperatures.