Haulage Vehicle Startup Control for Stop Contact Detection
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Solution Overview
Problem
Existing methods for determining whether an electrically driven haulage vehicle is in contact with a vehicle stop at startup are inaccurate when using an induction motor as the traveling driving source due to difficulties in sensing output torque, leading to potential energy waste and operational inefficiencies.
Innovation Solution
A controller system that utilizes an engine speed sensor and vehicle speed sensor to determine if the vehicle has reached specific threshold values after a predetermined elapsed time from engine startup, allowing for accurate determination of contact with a vehicle stop and preventing unnecessary motor operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
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 starting attempt, but energy is wasted and the load on the driving mechanism increases
Solution Approach 1:
The controller continuously monitors vehicle speed during the startup process and uses this feedback to determine whether the vehicle has successfully started. When the vehicle speed remains below the threshold value after the predetermined elapsed time, the controller identifies this as feedback indicating contact with the vehicle stop, and subsequently stops the motor to prevent energy waste.
Solution Approach 2:
The system uses the vehicle's own speed sensor and controller to automatically detect the contact state with the vehicle stop and autonomously stop the motor without requiring external intervention. The startup determination section self-manages the motor control based on real-time speed monitoring and time measurement.
2Reliability
If the haulage vehicle continues to be in contact with the vehicle stop during autonomous travelling, then the vehicle maintains position, but it falls into a deadlock where the start command is not completed
Solution Approach 1:
The controller monitors vehicle speed as feedback during autonomous operation attempts. When the vehicle speed remains below the threshold value after the predetermined time elapsed since the start command, the system identifies this as a deadlock condition and stops the motor, allowing the autonomous system to proceed to the next command without infinite waiting.
Solution Approach 2:
The system performs preliminary detection of the contact state by monitoring vehicle speed during a predetermined time period before declaring a deadlock. This preliminary action allows the system to distinguish between temporary delays and actual contact conditions, preventing premature termination while avoiding infinite deadlocks.
3Measurement precision
If the technology from Patent Document 1 is used to determine contact with vehicle stop, then contact detection is possible, but output torque of the induction motor cannot be sensed with high accuracy at startup
Solution Approach 1:
The invention introduces vehicle speed as an intermediary parameter to indirectly detect contact with the vehicle stop. Instead of directly measuring output torque which is difficult at startup, the system uses the speed sensor to monitor vehicle speed, which serves as a mediator that reflects the contact state without requiring direct torque measurement.
Solution Approach 2:
The system replaces the mechanical torque sensing approach with an electrical/electronic speed sensing approach. By using the speed sensor and controller to monitor vehicle speed and determine contact state, the invention substitutes the difficult mechanical torque measurement with an easier electrical speed measurement that provides sufficient information for contact detection.
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 detection of a start impossible state, preventing energy waste and potential operational deadlocks by accurately determining vehicle contact with a stop, even with induction motors, thus enhancing energy efficiency and safety.
Implementation Method 1
an engine speed sensor that senses a rotational speed of the engine
Implementation Method 2
a speed sensor that senses a rotational speed of the wheels
Implementation Method 3
an electrically driven motor that is driven by electric power supplied from the generator
Data Source
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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.