Electric Work Vehicle Transmission Control for Low-Load Energy Saving
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Solution Overview
Problem
Electric work vehicles consume excessive energy when operating in low work travel states, leading to inefficient power usage and reduced performance due to unnecessary motor operation.
Innovation Solution
Implementing a power conservation control system that includes a state detection unit and transmission control unit to reduce and stop motive power transmission to the traveling and working devices when in low work travel states, using a battery and motor configuration with a travel transmission system and work transmission system, and a remaining energy detection unit to manage energy output based on stored energy levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the motor operates at a predetermined rotation speed to ensure sufficient motive power for work performance, then the working device can perform work reliably, but excessive energy is consumed when traveling at low speed or when work is reduced
Solution Approach 1:
The patent applies dynamics by making the motor rotation speed variable rather than fixed. The transmission control unit dynamically adjusts the motor rotation speed based on detected travel speed and work state, allowing the motor to operate at appropriate speeds for different conditions rather than maintaining a predetermined rotation speed continuously
Solution Approach 2:
The patent changes the operational parameters of the motor based on detected conditions. When low work travel state is detected (travel speed below threshold and work state indicates reduced work), the transmission control unit reduces the motor rotation speed from the predetermined speed to a lower speed, thereby reducing energy consumption while maintaining sufficient power when needed
2Device complexity
If the motor maintains predetermined rotation speed during low work travel state, then the system structure remains simple, but unnecessary motor operation causes excessive energy consumption
Solution Approach 1:
The patent implements feedback control where the transmission control unit continuously monitors travel speed and work state, then adjusts motor rotation speed accordingly. The state detection unit provides feedback about current operating conditions, and the transmission control unit responds by adjusting motor speed to match actual needs, creating a closed-loop control system
Solution Approach 2:
The transmission control system automatically adjusts motor rotation speed based on detected conditions without requiring manual intervention. The system serves itself by autonomously determining when to reduce motor speed based on the combination of travel speed and work state detection, eliminating the need for complex manual control mechanisms
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
This solution reduces energy consumption by minimizing unnecessary motor operation, optimizing power usage, and ensuring sufficient motive power for work performance when needed, while allowing the vehicle to travel to a resupply location when energy is low.
Implementation Method 1
a motor configured to generate motive power by receiving supply of electric power from the battery
Data Source
AI summary
An electric work vehicle includes a battery; a motor that generates motive power by receiving electric power from the battery; a traveling device operated by the motive power; a work power output portion that outputs the motive power to be supplied to a working device for performing work; a travel transmission system that transmits the motive power from the motor to the traveling device; a work transmission system that transmits the motive power from the motor to the work power output portion; a state detection unit that detects a state of work travel; and a transmission control unit that controls the transmission states of the travel transmission system and the work transmission system. In response to the state detection unit detecting that the work travel is in a predetermined low work travel state, the transmission control unit performs power conservation control for reducing the electric power consumed by the motor.