Hybrid Controller Torque Assist Fuel Economy
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Solution Overview
Problem
Conventional hybrid systems face challenges in improving fuel economy due to increased electric power consumption by the electric supercharger and motor generator when expanding their activation region, which in turn increases fuel consumption for charging the energy storage system.
Innovation Solution
A controller for a hybrid system that activates the electric supercharger and motor generator to provide torque assist to the engine even when the required torque can be achieved by the engine alone, as long as the energy storage system's state of charge is sufficiently high, thereby reducing fuel injection and improving fuel economy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the activation region of the electric supercharger and motor generator is expanded to improve fuel economy, then the amount of fuel injected into the engine is reduced, but the electric power consumption by the electric supercharger and motor generator increases
Solution Approach 1:
The control device changes the operating parameters of the hybrid system by activating the electric supercharger and motor generator even when the engine alone can meet the required torque, but only when the energy storage system has sufficiently high state of charge. This parameter change allows the system to operate in a more fuel-efficient mode without compromising the engine's torque capability, thereby reducing overall fuel consumption while managing electric power consumption through conditional activation.
Solution Approach 2:
The system dynamically adjusts its operation mode based on real-time conditions, specifically the state of charge of the energy storage system. When the state of charge is sufficiently high, the system transitions to a mode where the electric supercharger and motor generator are activated to provide torque assist, reducing fuel injection. This dynamic adaptation allows the system to optimize the balance between fuel consumption and electric power consumption according to current operational conditions.
2Loss of energy
If the electric supercharger and motor generator are activated to provide torque assist even when engine alone can achieve required torque, then fuel injection amount is reduced, but electric power consumption increases
Solution Approach 1:
The control device implements parameter changes by monitoring the state of charge of the energy storage system and adjusting the activation status of the electric supercharger and motor generator accordingly. When the state of charge is sufficiently high, the system allows these electric components to operate, reducing fuel injection amounts. This conditional parameter adjustment resolves the contradiction by ensuring that electric power consumption is acceptable before activating the electric assist systems.
Solution Approach 2:
The control device uses feedback from the energy storage system's state of charge to make informed decisions about activating the electric supercharger and motor generator. This feedback mechanism ensures that the system only transitions to electric-assisted operation when the energy storage system can support the additional electric power consumption, thereby reducing fuel injection amounts while maintaining energy balance.
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
This approach further improves fuel economy by optimizing torque assist and reducing electric power consumption, allowing for downsizing of the energy storage system and enhancing vehicle performance.
Implementation Method 1
an electric supercharger (140) comprising an electric motor (142) and a compressor (144), to supercharge the intake air
Implementation Method 2
a turbocharger (150) comprising a turbine (154) and a compressor (152), the turbine (154) being rotated by exhaust from the engine (100)
Implementation Method 3
a motor generator (220) to generate electric power
Data Source
AI summary
A controller is provided for a hybrid system including an electric supercharger, a motor generator, and an energy storage system for supplying electric power to the electric supercharger and the motor generator controls the electric supercharger (and the motor generator in accordance with a required torque. Specifically, even when the required torque can be achieved by an engine alone, the controller for the hybrid system activates at least one of the electric supercharger and the motor generator to provide torque assist to the engine when the state of charge of the energy storage system is sufficiently high.