Hybrid Vehicle Control Device Torque Stability
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Solution Overview
Problem
In hybrid vehicle control systems, the existing technology struggles to appropriately cancel out torque changes caused by stopping combustion in some cylinders, leading to phase gaps between the internal combustion engine's torque and the correction torque, resulting in vibration and instability.
Innovation Solution
A control device that calculates a target ignition time and prohibits the stop process when the ignition time is later than a predetermined time, ensuring the motor generator can compensate for torque changes, and continues to prohibit the stop process until a fixed period elapses to prevent repeated interruptions and maintain stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the stop process is executed to reduce fuel consumption by stopping combustion in some cylinders, then fuel efficiency is improved, but torque fluctuations occur causing vibration and instability
Solution Approach 1:
The control device predicts future torque fluctuations based on the scheduled stop process and ignition timing, then preemptively adjusts the motor generator's torque output to counteract the anticipated torque decrease. This preliminary anti-action prevents torque fluctuations before they occur, maintaining torque stability while enabling fuel-saving stop processes.
Solution Approach 2:
The control device continuously monitors actual torque output from the internal combustion engine and compares it with target torque values. Based on this feedback, the motor generator dynamically adjusts its torque contribution to compensate for deviations caused by cylinder stop processes, ensuring stable total torque output while maintaining fuel efficiency benefits.
2Stability of the object's composition
If the motor generator outputs correction torque to cancel torque decrease from stopped cylinders, then torque stability is improved, but phase gaps occur when ignition timing changes causing compensation failure
Solution Approach 1:
The control device calculates the predicted torque decrease occurring at the next combustion stroke before it actually happens. By determining the compensation torque in advance and applying it proactively, the system ensures accurate torque compensation even when ignition timing changes, preventing phase gaps between the torque decrease and compensation.
Solution Approach 2:
The control device dynamically updates the predicted torque decrease calculation whenever ignition timing changes occur. The motor generator's compensation torque is continuously adjusted in real-time based on current ignition timing conditions, ensuring the compensation remains synchronized with the internal combustion engine's actual torque characteristics under varying operating conditions.
3Adaptability or versatility
If the control device repeatedly executes and interrupts the stop process to adapt to changing conditions, then adaptability is improved, but processing load increases and stability decreases
Solution Approach 1:
The control device performs comprehensive predictions of torque fluctuations and determines appropriate compensation strategies in advance, before actual torque deviations occur. This preliminary calculation approach enables the system to adapt to changing conditions without requiring repeated execution and interruption of the stop process, reducing processing load while maintaining adaptability.
Data Source
AI summary
A control device is capable of executing: an ignition time calculation process of calculating a target ignition time of an ignition plug; a stop process of stopping combustion control for some cylinders of a plurality of cylinders; and a compensation process of controlling a motor generator during the stop process, such that the motor generator compensates a drive power that is lost due to the stop of the combustion control. The control device prohibits the execution of the stop process when the target ignition time calculated in the ignition time calculation process is on a retard side of a predetermined prescribed time.