Hybrid Vehicle Drive Control Without Downshift Shock
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing in-vehicle control devices perform downshifting during automated driving even when the increase in requested driving force is due to slight gradients or curving, leading to gearshift shock and noise for drivers and passengers, thereby reducing drivability.
Innovation Solution
The in-vehicle control device prioritizes driving force increase from the electric motor over traditional engine-based downshifting, ensuring that driving force increases are achieved without downshifting the transmission, thereby reducing gearshift shock and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If downshifting is performed to increase driving force during automated driving, then the vehicle can respond to driving force requests, but gearshift shock and noise occur reducing drivability
Solution Approach 1:
The patent replaces the traditional mechanical downshifting solution with an electric motor-based driving force increase solution. When driving force increase is requested during automated driving, the system prioritizes increasing electric motor output over performing transmission downshifting, thereby substituting mechanical gear changes with electric power adjustment to eliminate gearshift shock and noise
Solution Approach 2:
The patent changes the control parameters by introducing a priority judgment mechanism that evaluates whether to increase driving force through electric motor output or through transmission downshifting. The system modifies the operating parameters of the electric motor (output torque, power) to achieve driving force increase without changing the transmission gear stage, thereby avoiding the harmful effects of downshifting
2Power
If downshifting is performed during automated driving, then driving force can be increased, but unexpected downshifting occurs on slight gradients or curves reducing drivability
Solution Approach 1:
The patent replaces the mechanical downshifting response with electric motor control. The system substitutes the traditional mechanical transmission response mechanism with an electric power adjustment mechanism, allowing driving force to be increased through motor output control rather than gear changes, thereby eliminating unexpected downshifting events that reduce drivability
Solution Approach 2:
The patent implements a feedback control mechanism that continuously monitors driving conditions (vehicle speed, acceleration requests, gradient, curve information) and adjusts electric motor output accordingly. The control system uses feedback from sensors and automated driving control to determine the appropriate driving force increase method, prioritizing electric motor output over downshifting based on real-time condition assessment
Data Source
AI summary
An in-vehicle control device is configured to be installed in a vehicle including an engine, a transmission configured to change speed of motive power of the engine and perform output to a drive shaft connected to a drive wheel, an electric motor configured to input and output motive power to and from the drive shaft, a power storage device configured to input and output electric power to and from the electric motor, and a steering device. The in-vehicle control device includes a processor, and the processor is configured to, at a time of driving force increase request when a driving force increase request is made to bring the vehicle into a predetermined target state during the automated driving control, give priority to driving force increase from the electric motor without downshifting the transmission, over driving force increase that involves downshifting the transmission.