Haulage Vehicle Start-State Detection to Prevent Motor Deadlock
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Solution Overview
Problem
Existing technologies struggle to accurately determine whether an electrically driven haulage vehicle, equipped with an induction motor, is in a travelling impossible state due to contact with a vehicle stop at the time of start, leading to energy wastage and potential deadlock in autonomous operations.
Innovation Solution
The system employs an engine speed sensor, vehicle speed sensor, and a controller to determine if the vehicle has reached specific threshold values for engine speed and elapsed time, allowing it to stop the motor if the vehicle is in a start impossible state, thereby preventing energy waste and deadlock.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the output of the electrically driven motor is continued when the vehicle is in contact with the vehicle stop, then the vehicle can maintain its driving force, but energy is wasted and the load on the driving mechanism increases
Solution Approach 1:
The controller continuously monitors vehicle speed and engine speed, and based on this feedback, determines whether the vehicle is in a travelling impossible state. When the vehicle speed remains below the threshold value after the elapsed time exceeds the time threshold value, the controller stops the electrically driven motor, thereby preventing energy waste while maintaining driving force when needed.
2Reliability
If the vehicle continues to be in contact with the vehicle stop after start command, then the vehicle can maintain its position, but it falls into a deadlock in autonomous travelling
Solution Approach 1:
The controller uses feedback from vehicle speed and engine speed sensors to detect when the vehicle is stuck against the vehicle stop. When the vehicle speed remains below the threshold value after the elapsed time exceeds the time threshold value, the controller stops the motor and generates a warning signal, preventing deadlock in autonomous operation while maintaining position stability when appropriate.
Solution Approach 2:
The controller acts as an intermediary between the start command and the motor operation. It introduces a time-based verification mechanism that mediates between maintaining position (by allowing contact with vehicle stop) and preventing deadlock (by detecting abnormal contact conditions and generating warning signals).
3Measurement precision
If the vehicle speed is monitored continuously to determine travelling impossible state, then accurate detection is achieved, but the system complexity increases
Solution Approach 1:
The controller performs preliminary actions by setting threshold values for vehicle speed and engine speed before actual travel operations. This preliminary configuration allows accurate detection of travelling impossible states without requiring complex real-time analysis, as the comparison against predetermined thresholds simplifies the detection logic.
Solution Approach 2:
The system uses existing sensors (vehicle speed sensor and engine speed sensor) that are already part of the vehicle's standard equipment. By utilizing these existing components for the additional function of detecting travelling impossible states, the system achieves accurate detection without significantly increasing overall system complexity.
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 approach enables reliable determination of the vehicle's start state, preventing energy waste and potential deadlock by accurately sensing vehicle speed and engine conditions, ensuring efficient operation and safe travel.
Implementation Method 1
an engine speed sensor that senses a rotational speed of the engine
Implementation Method 2
a speed sensor that senses a vehicle speed
Implementation Method 3
a generator that is mechanically driven by the engine, an electrically driven motor that is driven by electric power supplied from the generator
Data Source
AI summary
An electrically driven haulage vehicle travels by a driving force of an electrically driven motor driven by being supplied with electric power from a generator driven by an engine. A controller that controls the electrically driven motor includes an engine speed determining section that determines whether an engine speed as a sensed value of an engine speed sensor is equal to or higher than an engine speed threshold value when a vehicle start instruction is input, an elapsed time determining section that determines whether a first elapsed time measured from a time point at which it is determined that the sensed value is equal to or higher than the engine speed threshold value has reached a time threshold value, and a start determining section that determines whether a vehicle speed as a sensed value of a speed sensor is equal to or higher than a speed threshold value after it is determined that the first elapsed time has reached the time threshold value. The controller stops the electrically driven motor when it is determined that the sensed value of the speed sensor is lower than the speed threshold value.