Drive Shaft Torque Control via Steering Angle Detection
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Solution Overview
Problem
Conventional vehicles uniformly reduce engine torque based on specific conditions, leading to excessive torque reduction, which can result in poor vehicle gradability and increased production costs due to retesting for different gear ratios, and lack of torque calculation logics.
Innovation Solution
A drive shaft protection apparatus and method that includes detection devices for RPM, gear position, steering angle, and accelerator pedal position, with a controller that variably reduces engine torque based on the bending angle of the drive shaft to prevent torque exceeding a limit, optimizing torque for drive shaft characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uniform torque reduction is applied based on highest steering angle condition, then drive shaft protection is achieved, but vehicle gradability deteriorates and excessive torque is reduced
Solution Approach 1:
The patent implements dynamic torque reduction control that adjusts the reduction amount based on real-time steering angle conditions. Instead of uniform reduction, the controller calculates appropriate torque reduction at each steering angle, enabling the system to maintain maximum possible torque when steering angle is below critical thresholds while still protecting the drive shaft when bending angle exceeds limits.
Solution Approach 2:
The patent changes the torque reduction parameter dynamically based on steering angle. The controller monitors steering angle in real-time and adjusts the torque reduction amount accordingly, using different reduction strategies for different steering angle ranges. This allows optimization of both drive shaft protection and vehicle performance by adapting torque parameters to actual operating conditions.
2Manufacturing precision
If retesting is performed for different gear ratios to reconfigure engine torque reduction, then accurate torque control is achieved, but production time and costs increase
Solution Approach 1:
The patent creates a universal torque reduction control method that works across different gear ratios without requiring separate calibration for each ratio. The controller calculates appropriate torque reduction based on drive shaft bending angle and operating conditions, making the system adaptable to various transmission configurations. This eliminates the need for repeated retesting and reconfiguration for different gear ratios, significantly improving production efficiency while maintaining control accuracy.
Solution Approach 2:
The patent uses dynamic parameter adjustment based on actual operating conditions rather than fixed parameters set for each gear ratio. The controller monitors drive shaft bending angle, steering angle, and vehicle speed to calculate appropriate torque reduction, making the system flexible enough to handle different gear ratios without requiring separate calibration procedures.
Data Source
AI summary
A drive shaft protection apparatus may include a Revolutions Per Minute RPM) detection device configured to detect an RPM of an engine and of a turbine, a gear-shifting detection device configured to detect a lever position of a transmission, a steering-angle detection device configured to detect a steering angle, an accelerator pedal position detection device configured to detect a displacement of an accelerator pedal, an engine-torque detection device configured to detect an engine torque of a vehicle, a loss-torque detection device configured to detect loss torque of the vehicle, and a controller configured to change a limit torque based on a bending angle of a drive shaft upon receiving the steering angle, and variably perform engine torque reduction control in a manner that torque applied to the drive shaft does not exceed the limit torque in response to output signals of the respective detection device.