Hybrid Vehicle Controller Torque Compensation
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Solution Overview
Problem
Hybrid vehicles with engines and superchargers face torque shortages due to supercharger operation limitations, leading to decreased drive power and potential depletion of electric power stored in power storage devices, limiting torque assist by the rotary machine.
Innovation Solution
A controller that determines supercharger operation limitations and compensates for torque shortages using the rotary machine, while curbing electric power decreases by shifting gear ratios, increasing regenerative torque, and limiting motor-driven travel to maintain power storage device charge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the operation of the supercharger is limited to prevent knocking, then knocking is suppressed, but engine torque is limited causing a torque shortage
Solution Approach 1:
The rotary machine acts as an intermediary to transfer torque to the engine output shaft, compensating for the torque shortage caused by supercharger operation limitation. This allows the supercharger to operate at reduced capacity while maintaining sufficient total torque output through the combined engine-rotoary machine system.
Solution Approach 2:
The control device changes the operating parameters of the rotary machine (rotation speed, torque output) to compensate for the reduced engine torque. By dynamically adjusting the rotary machine's torque contribution based on the torque shortage amount, the system maintains overall torque output while the supercharger operates at limited capacity.
2Force
If torque assist using the rotary machine is increased to compensate for engine torque shortage, then drive power is maintained, but electric power stored in the power storage device decreases
Solution Approach 1:
The control device applies partial torque assist from the rotary machine rather than maximum torque assist, providing just enough compensation to maintain acceptable drive power while minimizing electric power consumption from the power storage device. This balanced approach prevents excessive battery discharge.
Solution Approach 2:
The control device continuously monitors the state of charge of the power storage device and adjusts the rotary machine's torque output accordingly. When battery charge level decreases, the feedback control reduces rotary machine torque assist, thereby conserving electric power in the power storage device while maintaining sufficient drive power.
3Reliability
If the number of times torque assist is performed increases, then drive power compensation is improved, but electric power stored in the power storage device depletes and torque assist cannot be performed
Solution Approach 1:
The control device performs preliminary assessment of power storage device charge levels before initiating torque assist operations. By checking the battery state in advance, the system determines whether torque assist can be safely performed without causing power storage device depletion, thereby maintaining reliable torque assist availability.
Solution Approach 2:
The control device uses feedback from the power storage device state to regulate the frequency and duration of torque assist operations. When the power storage device charge level drops below a threshold, the feedback mechanism limits or prevents further torque assist operations, ensuring the battery maintains sufficient charge for future torque assist needs.
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
Prevents torque shortages by effectively utilizing the rotary machine to compensate for engine torque deficits and conserves electric power, ensuring stable drive power and extended battery life during supercharger operation limitations.
Implementation Method 1
a rotary machine serving as a drive power source for travel, and a power storage device configured to transmit and receive electric power to and from the rotary machine
Implementation Method 2
a power storage device configured to transmit and receive electric power to and from the rotary machine
Data Source
AI summary
There are provided a controller and a control method for a hybrid vehicle including an engine with a supercharger serving as a drive power source for travel, a rotary machine serving as a drive power source for travel, and a power storage device configured to transmit and receive electric power to and from the rotary machine. The controller determines whether an operation of the supercharger is limited, compensates for a torque shortage of the engine due to limitation of the operation of the supercharger by a torque of the rotary machine when it is determined that the operation of the supercharger is limited, and curbs a decrease in an amount of electric power stored in the power storage device more when it is determined that the operation of the supercharger is limited than when it is determined that the operation of the supercharger is not limited.