Hybrid Vehicle Control Apparatus for Suppressing Gear Shift Shock
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In electric vehicles, shift shock from the transmission can occur when neutral control is executed during rotation synchronization control, disrupting the adjustment of the electric motor's rotation speed and potentially causing transmission shocks, especially when shifting gears.
Innovation Solution
A control apparatus with a determination section to identify neutral requests, a neutral control section to shut off current to the electric motor, and a delay section to postpone neutral control execution until rotation synchronization control is complete, ensuring smooth gear shifts and reducing shift shock.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If neutral control is executed during rotation synchronization control, then the power transmission to the wheel side output shaft is shut off quickly, but the rotation speed adjustment of the electric motor is interrupted causing shift shock
Solution Approach 1:
The control apparatus determines whether rotation synchronization control is being executed before applying neutral control. By checking the execution state of rotation synchronization control in advance, the system prevents interruption of the rotation speed adjustment process, thereby avoiding shift shock while still enabling neutral control to be applied when appropriate
2Loss of time
If neutral control is executed during rotation synchronization control, then the neutral state is achieved immediately, but the gear shift process is disrupted causing transmission shock
Solution Approach 1:
The control apparatus uses feedback from the determination section to detect whether rotation synchronization control is currently being executed. Based on this feedback, the control section decides whether to apply neutral control, thereby preventing disruption of the gear shift process and avoiding transmission shock while still achieving the neutral state when conditions permit
Data Source
AI summary
The hybrid vehicle is provided with a power distribution mechanism (20) distributing a power of an internal combustion engine (16) to a wheel side output shaft (6) and a first motor generator (18), and a transmission (14) transmitting a power of a second motor generator (12) to the wheel side output shaft (6). An electronic control unit (30) executes a rotation synchronization control for synchronizing a rotation speed of the second motor generator (12) prior to the gear shift with a rotation speed after the gear shift at a time of gear shift of the transmission (14). In the case that a neutral request for shutting off a power transmission to the wheel side output shaft (6) is executed during an execution of the rotation synchronization control, an execution of the neutral control of shutting off the application of current to the first and second motor generators (18, 12) is inhibited until the execution of the rotation synchronization control is finished.