Hybrid Vehicle Torque Control for Engine-Motor Response Sync
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Solution Overview
Problem
Conventional hybrid vehicles experience drivability issues due to delayed torque response synchronization between the engine and motor, leading to deviations in actual torque from the target torque, which is not effectively addressed by synchronizing engine and motor torque increases.
Innovation Solution
A driving force control device that estimates future engine torque changes based on intake air and throttle valve characteristics, and adjusts motor torque to synchronize with engine torque, thereby reducing response delays and deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the motor torque increase timing is delayed to synchronize with engine torque increase, then the torque response delay is reduced, but the drivability deteriorates due to delayed response to driver input
Solution Approach 1:
The controller performs preliminary action by increasing motor torque before the engine torque increase is complete. When the accelerator operation amount changes, the controller increases motor torque in advance to compensate for the engine's slow response, ensuring the total vehicle torque reaches the target value without delaying the response to driver input.
2Stability of the object's composition
If the engine and motor torque increases are synchronized, then the torque change stability is improved, but the deviation from target torque cannot be eliminated
Solution Approach 1:
The controller uses feedback by continuously monitoring the accelerator operation amount and dynamically adjusting the motor torque based on the deviation from the target vehicle torque. The controller calculates the difference between the current total torque and target torque, then adjusts motor torque to eliminate this deviation, ensuring both stability and accuracy.
Solution Approach 2:
The controller changes the parameter of motor torque dynamically based on the engine's response characteristics. By adjusting the motor torque magnitude and timing according to the accelerator operation amount and engine state, the controller optimizes the torque distribution to achieve both stable torque change and minimal deviation from target torque.
Data Source
AI summary
A driving force control device for a vehicle is provided, which includes a motor, an engine, and a controller. The controller sets a target torque of the vehicle corresponding to accelerator operation, distributes a target engine torque, based on the target torque, and outputs a control signal corresponding to the target engine torque. The controller estimates a future amount of intake air to a cylinder based on the target engine torque, and estimates an engine torque after a setup time from the present time based on the estimated future amount of intake air. The controller sets a target motor torque after the setup time based on the estimated engine torque after the setup time so that the target torque is achieved, and outputs a control signal corresponding to the target motor torque to synchronize a torque response of the engine with a torque response of the motor.