Powertrain Control Strategy for Automatic Mode Switching
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Solution Overview
Problem
Existing control systems for powertrain systems in machines like wheel loaders and dozers rely heavily on operator discretion, leading to inefficient operation and lack of automatic mode selection, resulting in suboptimal performance and fuel efficiency during different work cycles.
Innovation Solution
A control system that includes sensors for ground speed and engine load, an operational state determination module, and a controller that adjusts engine speed and transmission torque commands based on the operational state of the machine to automatically switch between economy and performance modes, ensuring the powertrain output meets or is less than the operator's request.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If operator manually enters operational mode in control system, then machine can perform different operations, but operator discretion and experience make it cumbersome and inefficient
Solution Approach 1:
The control system automatically determines operational state and selects appropriate operational modes without requiring manual operator input. The system monitors sensor data (ground speed, engine load, implement position) and autonomously switches between modes such as economy mode and performance mode, allowing the machine to serve itself in mode selection.
Solution Approach 2:
The patent replaces manual operator decision-making with an automated electronic control system that uses sensor data and pre-programmed logic to determine operational modes. This substitution of mechanical/manual operation with electronic automation eliminates the need for operator discretion while improving efficiency.
2Adaptability or versatility
If operator manually controls operational mode, then machine operation can be adjusted, but operator may not put in effort and operate in single mode only
Solution Approach 1:
The control system continuously monitors multiple sensor inputs including ground speed, engine load, and implement position to determine the current operational state. Based on this feedback, the system automatically adjusts operational modes to match the actual work cycle phase, ensuring optimal performance throughout dig, transport, and dump operations.
Solution Approach 2:
The operational mode is made dynamic rather than static, automatically changing based on real-time operational conditions. The system transitions between different operational modes (economy, performance, etc.) as the machine moves through different phases of the work cycle, optimizing performance for each specific operational phase.
3Loss of energy
If fuel injection timing is optimized for complete combustion, then fuel efficiency improves, but engine performance tradeoff occurs
Solution Approach 1:
The control system dynamically adjusts engine operating parameters including fuel injection timing, engine speed limits, and torque limits based on the determined operational state. During economy mode, parameters are optimized for fuel efficiency with retarded injection timing and reduced engine speed limits. During performance mode, parameters are adjusted for maximum power output with advanced injection timing and higher engine speed limits.
Data Source
AI summary
A control system for a powertrain in a machine includes a first sensor which generates a first signal indicative of a ground speed of the machine. The control system includes a second sensor which generates a second signal indicative of a load of an engine in the powertrain. The control system includes a third sensor which generates a third signal indicative of an operational state of the machine. The control system includes an input device which enables an operator to generate a request for a powertrain output. The control system further includes a controller in communication with the first sensor, the second sensor, the third sensor and the input device. The controller determines an engine speed command and a transmission output torque command to produce a powertrain output based at least on the first signal, the second signal and the third signal in response to the requested powertrain output.