Hybrid Vehicle Control Apparatus Seizure Detection
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Solution Overview
Problem
Conventional hybrid vehicles face issues with unintended engine braking, engine stalling, and vibrations due to the potential seizure of the second engaging element when slip control is executed without proper detection, especially when the element is heated, leading to inadequate slippage and inefficient power transmission.
Innovation Solution
A hybrid vehicle control apparatus that includes an engine, a motor, a first engaging element, a second engaging element, and a controller to detect the input rotational speed of the second engaging element, determining whether it is seized by analyzing the actual gear ratio and adjusting the drive force of the motor/generator to prevent seizure and ensure smooth operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If slip control of the second engaging element is executed without detecting seizure, then the engine can be used during acceleration and low speed travel, but the second engaging element may seize due to heating causing unintended engine braking, engine stalling, or vibrations
Solution Approach 1:
The controller performs preliminary detection of seizure conditions by monitoring the relationship between input rotational speed and output rotational speed before slip control is executed. When the detected rotational speed ratio deviates from the expected gear ratio, the controller identifies potential seizure and prevents slip control execution, thereby avoiding the harmful effects of heating and subsequent seizure.
Solution Approach 2:
The system continuously monitors the input rotational speed of the second engaging element and compares it with the output rotational speed to detect abnormal conditions. This feedback mechanism allows the controller to identify when the engaging element is seized and adjust control commands accordingly, preventing unintended engine braking, stalling, or vibrations.
2Power
If the second engaging element is controlled in a slipping state to allow engine operation, then power transmission can be managed during acceleration, but the element may overheat and seize
Solution Approach 1:
Before allowing slip control to execute, the controller checks whether the second engaging element is in a seized state by detecting the rotational speed ratio. This preliminary detection prevents slip control from being executed when the element is already seized or at risk of seizing due to overheating, thereby avoiding further temperature increase and potential failure.
Solution Approach 2:
The system takes preliminary anti-action by detecting abnormal rotational speed relationships that indicate seizure conditions and preventing slip control execution before overheating can occur. This proactive approach counteracts the potential harmful effect of temperature increase and seizure.
3Productivity
If normal slipping control is executed without seizure detection, then the engine can provide driving force, but unintended engine braking occurs during coasting degrading driving performance
Solution Approach 1:
The controller continuously monitors the rotational speed relationship between the input and output of the second engaging element. When the detected ratio deviates from the expected gear ratio, the system identifies seizure conditions and adjusts control commands to prevent unintended engine braking during coasting, thereby maintaining smooth driving performance.
Solution Approach 2:
The system performs preliminary detection of seizure conditions before they manifest as harmful effects. By monitoring rotational speed ratios in advance, the controller can prevent unintended engine braking and maintain optimal driving performance.
Data Source
AI summary
A hybrid vehicle control apparatus includes an engine, a motor, first and second engaging elements, an input rotational speed and a controller. The first engaging element is arranged between the engine and the motor to selectively connect and disconnect the engine and the motor. The second engaging element is arranged between the motor and a drive wheel to selectively connect and disconnect the motor and the drive wheel. The input rotational speed detecting section is configured to detect an input rotational speed of the second engaging element corresponding to a rotational speed of the motor. The controller is configured to determine whether the second engaging element is seized based on the input rotational speed when a disengagement command or a slip engagement command has been issued to the second engaging element and a drive force of at least one of the engine and the motor has been changed.