Four-Wheel-Drive Torque Control for Engine Pulsation Noise
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Solution Overview
Problem
Existing driving force distribution control devices in four-wheel-drive vehicles fail to effectively suppress abnormal sounds caused by engine pulsation while maintaining fuel efficiency, as they rely on frictional torque that is not optimized for all engine speed ranges and driving conditions.
Innovation Solution
A driving force distribution control device that adjusts torque transmission to the auxiliary drive wheels based on engine driving force and transmission ratios, using a control system to set torque values that reduce abnormal sounds during engine pulsation, thereby minimizing unnecessary torque transmission and improving fuel efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If frictional torque is increased to suppress abnormal sound in the driving force transmission system, then abnormal sound is reduced, but fuel efficiency deteriorates due to increased energy loss
Solution Approach 1:
The patent applies dynamics by making the frictional torque adjustable rather than fixed. The control device dynamically changes the frictional torque value based on detected engine pulsation characteristics (frequency and amplitude) to suppress abnormal sound only when necessary, rather than maintaining constant high frictional torque that would waste energy during normal operation.
Solution Approach 2:
The patent changes the parameter of frictional torque based on engine operating conditions. The control device detects engine pulsation parameters and adjusts the frictional torque in the torque coupling accordingly, using parameter changes in both the pulsation detection and the frictional torque control to suppress abnormal sound while minimizing energy loss.
2Object-affected harmful factors
If driving force is transmitted to auxiliary drive wheels to suppress abnormal sound, then abnormal sound is reduced, but energy consumption increases
Solution Approach 1:
The patent makes the driving force distribution dynamic by continuously adjusting the frictional torque to auxiliary drive wheels based on real-time engine pulsation detection. The system transmits driving force to suppress abnormal sound only when pulsation is detected, rather than continuously transmitting force, thereby reducing overall energy consumption.
Solution Approach 2:
The system uses self-service by detecting engine pulsation characteristics and automatically adjusting frictional torque without external intervention. The control device monitors engine operation and autonomously determines when to suppress abnormal sound, enabling the system to serve its own control needs while optimizing energy usage.
3Device complexity
If frictional torque is set to a fixed value, then control is simple, but it cannot effectively suppress abnormal sound across different engine speed ranges and driving conditions
Solution Approach 1:
The patent transitions from static to dynamic control by detecting engine pulsation in real-time and adjusting frictional torque accordingly. The control device dynamically adapts the frictional torque value based on detected pulsation frequency and amplitude, enabling effective abnormal sound suppression across varying engine speeds and driving conditions while maintaining relatively simple control logic.
Solution Approach 2:
The patent implements feedback control by detecting engine pulsation characteristics and using this information to adjust frictional torque. The control device continuously monitors engine operation, detects pulsation parameters, and adjusts the frictional torque in response, creating a closed-loop feedback system that adapts to changing conditions.
Data Source
AI summary
A driving force distribution control device, which is mounted on a vehicle including an engine configured to generate driving force for the vehicle, a transmission device configured to shift rotation of an output shaft of the engine by transmission ratios, and a driving force transmission system capable of transmitting output of the transmission device to main drive wheels and auxiliary drive wheels, includes: a control device configured to, when a rotational speed of the output shaft of the engine is in a range in which abnormal sound of the driving force transmission system due to pulsation of the driving force can be generated, set a torque value to a value capable of reducing the abnormal sound depending on the driving force; and a driving force transmitting device configured to transmit driving force depending on the set value to the auxiliary drive wheels.