Vehicle Torque Control for Transmission Protection and Driveability
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Solution Overview
Problem
Existing vehicle control systems face challenges in executing torque control to protect transmissions while maintaining sufficient driving power and driveability, especially on uphill roads where large driving power is required.
Innovation Solution
A vehicle control device and method that separately control driving powers distributed to right and left wheels, incorporating a slip detection unit and torque control unit to determine and execute torque control based on wheel slip and transmission state, ensuring appropriate torque input to the transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If torque control is executed to protect the transmission during wheel slip, then transmission protection is improved, but driving power is reduced
Solution Approach 1:
The control device changes the parameter of engine torque based on the detected slip state and transmission state. When slip is detected, the engine torque is reduced to protect the transmission; when slip is prevented, the torque is restored to maintain driving power. This dynamic parameter adjustment resolves the contradiction between transmission protection and driving power maintenance.
Solution Approach 2:
The control device uses feedback from the slip detection unit to continuously monitor wheel slip conditions and adjusts the engine torque accordingly. The feedback mechanism ensures that torque control is executed only when necessary for transmission protection, and normal driving power is maintained when slip conditions are not present, thus resolving the contradiction between the two requirements.
2Reliability
If torque control is executed in addition to vehicle posture control on uphill roads, then transmission protection is improved, but driveability deteriorates
Solution Approach 1:
The control device dynamically adjusts the engine torque parameter based on the combined consideration of slip state, transmission state, and vehicle posture control requirements. On uphill roads, the system carefully balances torque reduction for transmission protection with maintaining sufficient driving power for climb performance, thus resolving the contradiction between transmission protection and driveability.
Solution Approach 2:
The control device applies partial torque control only when slip conditions are detected, rather than continuously reducing torque. This partial action approach ensures transmission protection is provided when needed while minimizing the impact on driveability during normal uphill driving conditions where slip is not occurring.
3Reliability
If engine torque is reduced to control wheel slip, then wheel slip prevention is improved, but driving power becomes insufficient
Solution Approach 1:
The control device applies periodic or intermittent torque control based on the detection of slip conditions. When slip is detected, torque control is activated; when slip is prevented, normal torque is restored. This periodic action ensures wheel slip prevention while minimizing the duration and extent of torque reduction, thus maintaining sufficient driving power.
Solution Approach 2:
The engine torque parameter is changed dynamically based on the slip state. The control device increases torque when slip conditions are not present to maintain driving power, and reduces torque only when slip is detected to prevent wheel slip. This conditional parameter change resolves the contradiction between slip prevention and driving power maintenance.
Data Source
AI summary
A vehicle control device separately controls driving powers distributed to right and left wheels. The vehicle control device is configured to execute a vehicle posture control for reducing the driving powers transmitted from a driving source to the wheels by a request from a vehicle side. The vehicle control device includes a slip detection unit and a torque control unit. The slip detection unit is configured to detect a slip in the wheels. The torque control unit is configured to determine whether to perform a torque control after an operation of the vehicle posture control according to a detection result of the slip and a state of a transmission. The torque control is a control to control a torque input to the transmission by a request from the transmission side. The torque control unit is configured to execute the torque control on the basis of a determination result.