Hybrid Power Control Module for Reverse Drive Torque
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Solution Overview
Problem
Existing power output apparatuses for motor vehicles struggle to maintain optimal drive feeling and torque levels during reverse rotation of the drive shaft, often compromising either drive feeling or torque delivery due to inefficient control of internal combustion engines and generators.
Innovation Solution
A power output apparatus with a control module that sets a target drive point for the internal combustion engine based on operator input, adjusting the engine's operation to ensure both improved drive feeling and sufficient torque for reverse rotation, utilizing a power conversion transmission structure that converts engine power into electric and mechanical power for efficient power distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the internal combustion engine is controlled to drive at an efficient drive point of low rotation speed and high torque, then the total energy efficiency of the power output apparatus is enhanced, but the torque level to be cancelled by the motor increases and reverse rotation of the drive shaft cannot be achieved with sufficient torque
Solution Approach 1:
The control module dynamically adjusts the target drive point of the internal combustion engine based on the rotation direction of the drive shaft. When reverse rotation is detected, the system transitions from the efficient low-speed high-torque drive point to a high-speed low-torque drive point, enabling the motor to effectively cancel the engine torque and achieve sufficient reverse rotation torque.
2Force
If the internal combustion engine is controlled to drive at a drive point of high rotation speed and low torque, then the torque for reverse rotation is sufficient, but the drive feeling deteriorates since the engine operates at a drive point different from the driver's expected drive point
Solution Approach 1:
The system dynamically switches between different drive points based on operating conditions. During reverse rotation, it temporarily operates at high rotation speed and low torque to enable sufficient reverse torque. During forward rotation, it operates at the efficient low rotation speed and high torque drive point to maintain good drive feeling and energy efficiency.
3Loss of energy
If the target drive point of the internal combustion engine is set independently of the driver's operation, then the energy efficiency is improved, but the drive feeling worsens due to mismatch with driver's expected drive point
Solution Approach 1:
The control module continuously monitors the rotation direction of the drive shaft and uses this feedback to determine the appropriate target drive point. When the drive shaft rotates in reverse, the system receives feedback and adjusts the engine operating point accordingly, balancing energy efficiency with driver expectations and vehicle performance requirements.
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
The solution enhances drive feeling and ensures the required driving force during reverse rotation by optimizing the drive point of the internal combustion engine, thereby improving overall driving performance and torque delivery.
Implementation Method 1
a power conversion transmission structure that is connected to an output shaft of the internal combustion engine and to the drive shaft, the power conversion transmission structure converting at least part of output power of the internal combustion engine into electric power while transmitting a residual of the output power to the drive shaft
Implementation Method 2
a motor that is capable of outputting power both in a normal rotating direction and in a reverse rotating direction to the drive shaft with the electric power converted by the power conversion transmission structure
Data Source
AI summary
In a reverse drive with power output from an engine, the control procedure of the invention selects a drive point of the higher rotation speed corresponding to the higher accelerator opening among available drive points that ensure output of a target engine power, and controls the engine to be driven at the selected drive point and ensure output of a torque demand corresponding to the accelerator opening to a drive shaft. A required torque level output from a motor MG2 increases with an increase in engine torque under the conditions of a fixed torque demand of the drive shaft and a fixed output power level of the engine 22. Setting a drive point of the higher rotation speed and the lower torque corresponding to a higher level of the accelerator opening ensures output of the torque demand to the drive shaft. Setting a drive point of the lower rotation speed and the higher torque corresponding to a lower level of the accelerator opening improves the drive feeling of the engine.