Hybrid Drive Control Device Mode Switching for Acceleration and Efficiency
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Solution Overview
Problem
Conventional hybrid vehicles face challenges in starting suitably for driver-requested acceleration or fuel efficiency due to limited drive force and running distance, as the first electric motor is only freely rotating without output during motor running.
Innovation Solution
A drive control device with a first and second differential mechanism, connected through a clutch and brake, allowing for selective operation modes such as acceleration drive and fuel efficiency drive modes, enabling the vehicle to start by generating drive force using either the first or second electric motor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the first electric motor is only freely rotating without output during motor running, then the structure is simple, but the drive force and motor running distance are limited
Solution Approach 1:
The patent implements dynamic switching between different operating modes (motor running mode and engine running mode) through a mode selecting operation device. This allows the first electric motor to transition from free rotation to active drive force generation, dynamically adapting the system configuration to meet varying drive force requirements while maintaining structural simplicity.
Solution Approach 2:
The patent changes the operational parameters of the first electric motor based on selected mode. In motor running mode, the motor operates freely; in engine running mode, it generates drive force. This parameter change enables the same motor to serve different functions, resolving the contradiction between structural simplicity and drive force capability.
2Device complexity
If the first electric motor is only freely rotating without output during motor running, then the control system is simple, but the motor running distance is limited
Solution Approach 1:
The mode selecting operation device enables dynamic switching between motor running mode and engine running mode, allowing the system to extend motor running distance by transitioning to engine running mode when necessary, without requiring a permanently complex control system.
Solution Approach 2:
The control system is designed to perform multiple functions: it can operate in simple motor running mode for extended distances and switch to engine running mode when additional drive force is needed. This multi-functionality allows the same control system to adapt to different operational requirements.
3Device complexity
If the vehicle cannot start in vehicle-acceleration-oriented or fuel-efficiency-oriented manner, then the system is simple, but the adaptability to driver requests is poor
Solution Approach 1:
The mode selecting operation device provides dynamic adaptability by allowing drivers to choose between different starting modes (vehicle-acceleration-oriented or fuel-efficiency-oriented). The system responds dynamically to driver requests, switching between motor running mode and engine running mode to achieve the desired starting characteristics.
Solution Approach 2:
The mode selecting operation device allows drivers to pre-select their preferred starting mode before vehicle启动. This preliminary action enables the system to be configured in advance for either acceleration performance or fuel efficiency, improving adaptability to driver preferences.
Data Source
AI summary
A drive control device for a hybrid vehicle is provided with a differential device including four rotary elements; and an engine, first and second electric motors and an output rotary member which are respectively connected to the four rotary elements. One of the four rotary elements is constituted by a rotary component of a first differential mechanism and a rotary component of a second differential mechanism selectively connected through a clutch, and one of the rotary components is selectively fixed to a stationary member through a brake. The drive control device comprises a mode selecting operation device selecting an acceleration drive mode oriented to vehicle acceleration and a fuel efficiency drive mode oriented to fuel efficiency. When the acceleration drive mode is selected at the start of the vehicle, the vehicle starts in motor running or engine running in which a drive force is generated by operating the first electric motor and the second electric motor while when the fuel efficiency drive mode associated with a requirement for fuel efficiency is selected, the vehicle starts in motor running or engine running in which a drive force is generated by operating the first electric motor or the second electric motor. The drive control device has a first motor drive mode in which the second electric motor is used for running with the brake placed in an engaged state; a first engine drive mode in which the first electric motor is caused to generate a reaction torque while the second electric motor is caused to generate a drive force with the brake placed in an engaged state; a second motor drive mode in which the first electric motor and the second electric motor are used for running with the brake and the clutch placed in an engaged state; and a second engine drive mode in which the first electric motor and the second electric motor are caused to generate a reaction torque with the clutch placed in an engaged state. When the fuel efficiency drive mode is selected and the motor running is requested, the first motor drive mode is selected. When the fuel efficiency drive mode is selected and the engine running is requested, the first engine drive mode is selected. When the acceleration drive mode is selected and the motor running is requested, the second motor drive mode is selected. When the acceleration drive mode is selected and the engine running is requested, the second engine drive mode is selected.