Vehicle Control System Power Restriction for Storage Protection
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Solution Overview
Problem
Existing vehicle control systems face damage to electric storage devices due to abrupt changes in motor speed, leading to overcharge or overdischarge, as they struggle to manage power generation and consumption efficiently during mode shifts.
Innovation Solution
A vehicle control system with a controller that calculates and restricts electric power to prevent overcharge or overdischarge by engaging the engagement device only when a predetermined speed difference is met, limiting power to the maximum allowable value before engagement, and including an avoidance mechanism to prevent undesirable engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the engagement device is engaged to shift operating modes promptly, then the response speed is improved, but the motor speed changes abruptly causing damage to the electric storage device
Solution Approach 1:
The control device performs preliminary actions by restricting electric power to the maximum allowable value before the engagement device is engaged. This preliminary power restriction prevents abrupt motor speed changes that would occur during engagement, thereby protecting the electric storage device from damage while still allowing prompt mode shifting when the speed difference condition is met.
2Reliability
If the friction clutch is engaged gradually while slipping, then the motor speed change is reduced gradually, but the mode shift response is delayed
Solution Approach 1:
The control device changes the parameter of electric power to the maximum allowable value before engagement occurs. This parameter change prepares the motor to handle the upcoming speed change during engagement without causing harmful abrupt changes, enabling both reliable motor speed control and prompt mode shifting.
3Reliability
If the dog clutch is engaged completely, then the engagement is reliable, but the torque transmitting capacity changes abruptly between 0% and 100%
Solution Approach 1:
The control device performs preliminary power restriction to the maximum allowable value before the dog clutch engages completely. This preliminary action ensures that when the clutch engages and torque transmitting capacity changes abruptly from 0% to 100%, the motor power remains within safe limits, preventing damage to the electric storage device while maintaining reliable engagement.
Data Source
AI summary
A vehicle control system configured to limit damage to an electric storage device even if a speed of a motor is changed abruptly. The control system includes a differential mechanism connected to an engine, a motor, and drive wheels, and a clutch. The control system includes a controller is configured to calculate an upper limit power possible to be applied or discharged to or from an electric storage device when a condition to engage the clutch is satisfied and restrict the electric power to be applied or discharged to or from the electric storage device when the electric power is equal to or less than a maximum allowable power that is less than the upper limit power before the clutch is engaged.