Vehicle Control Device Torque Limiting for Power Transmission Durability
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Solution Overview
Problem
The existing vehicle control devices struggle to balance the durability of power transmission system components with vehicle performance, as torque limitations required for extended service life in long-term use vehicles lead to reduced driving performance, and insufficient torque limits may cause premature deterioration, while excessive limits reduce drivability.
Innovation Solution
A vehicle control device with an arithmetic processing circuit that estimates the deterioration degree of power transmission system components and executes torque limit control based on scheduled maintenance dates, adjusting the output torque to delay deterioration beyond allowable limits until maintenance, thereby minimizing performance reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If torque limit control is applied to extend component service life, then component durability is improved, but vehicle driving performance is reduced
Solution Approach 1:
The patent implements dynamic torque limit control where the upper limit value of output torque is adjusted in real-time based on the estimated deterioration degree and scheduled maintenance date. The control system transitions from static torque limiting to dynamic adjustment, increasing torque limits when deterioration is slow and maintaining lower limits when deterioration accelerates, thus optimizing both component durability and driving performance throughout the component's service life.
Solution Approach 2:
The system changes the torque limit parameter based on the deterioration degree parameter and time parameter. By calculating the estimated deterioration degree and comparing it with the scheduled maintenance date, the system dynamically adjusts the torque upper limit value to delay deterioration progression to exactly the maintenance timing, resolving the contradiction between extending service life and maintaining performance.
2Reliability
If significant torque limitation is applied to ensure component service life matches vehicle service life, then component reliability is improved, but vehicle drivability is reduced
Solution Approach 1:
The system dynamically adjusts torque limitations based on the actual deterioration rate and time remaining until maintenance. Instead of applying constant significant torque limitation, the system calculates the optimal upper limit value that delays deterioration to the maintenance date while maximizing drivability. This dynamic approach ensures drivability is only reduced when absolutely necessary to prevent component failure.
3Duration of action of stationary object
If torque limit control is applied to delay deterioration progression, then component life is extended, but vehicle performance is compromised
Solution Approach 1:
The system changes the torque parameter based on deterioration degree and time parameters. By calculating the estimated deterioration degree and the quotient comparing remaining life to time until maintenance, the system adjusts the torque upper limit to extend component life to the maintenance date while minimizing performance compromise. The parameter adjustment is precise and time-dependent, optimizing both component life and vehicle performance.
Data Source
AI summary
The vehicle control device includes an arithmetic processing circuit configured to estimate a deterioration degree of a power transmission system component provided in a power transmission path between a drive source and wheels of a vehicle. The arithmetic processing circuit is configured to execute torque limit control that reduces an upper limit value of output torque of the drive source based on a scheduled maintenance date of the vehicle after a current date and an estimated value of the deterioration degree.