Six-Wheel Drive Traction Control via Selective Braking
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Solution Overview
Problem
Construction machines experience reduced acceleration due to wheel slip on soft ground surfaces, and existing traction control systems increase production costs by requiring hydraulic clutches and circuits for differential-locking each axle.
Innovation Solution
A traction control device for six-wheel drive construction machines that controls braking mechanisms only for specific axles and adjusts differentials between front and rear wheels, simplifying the hydraulic circuit and reducing costs while ensuring sufficient acceleration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a differential-lock device is provided to each axle to lock differential between right and left wheels, then wheel slip control is improved, but production cost significantly increases due to required hydraulic clutch and circuit
Solution Approach 1:
The patent extracts the differential-lock function from a separate mechanical device and integrates it into the existing braking mechanism through electronic control. The ECU controls the brake devices to create differential braking forces that achieve the same effect as mechanical differential-lock, eliminating the need for hydraulic clutches and circuits while maintaining wheel slip control capability
Solution Approach 2:
The patent replaces the mechanical hydraulic differential-lock system with an electronically controlled braking system. The ECU processes wheel speed signals and controls brake devices to achieve differential locking effect through controlled braking forces, substituting mechanical complexity with electronic control simplicity
2Reliability
If braking mechanism is controlled for all driving wheels, then wheel slip control is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by selectively controlling brake devices only on axles where wheel slip is detected. The ECU determines which axle experiences slip and applies braking control locally to that specific axle rather than uniformly controlling all driving wheels, reducing system complexity while maintaining effective slip control
Solution Approach 2:
The patent segments the six-wheel drive system into independent axle groups for differential control. The ECU can independently control braking on different axles based on individual slip conditions, allowing selective activation of brake devices on specific axles rather than requiring coordinated control of all wheels simultaneously
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively controls wheel slip and maintains acceleration on soft surfaces without the need for costly differential-lock devices, enhancing the construction machine's performance and reducing production costs.
Implementation Method 1
a braking mechanism provided to each of the wheels
Implementation Method 2
a differential adjusting mechanism for adjusting a differential between the front and rear driving wheels
Data Source
AI summary
A traction control device of a six-wheel drive construction machine, the drive construction machine including: right and left front wheels connected to each other via an axle, right and left center wheels connected to each other via an axle, and right and left rear wheels connected to each other via an axle, the right and left front, center and rear wheels being driven as driving wheels; a braking mechanism provided to each of the wheels; and a differential adjusting mechanism for adjusting a differential between the front and rear driving wheels, the traction control device controls the braking mechanisms only for the driving wheels related to any two of axles while controlling the differential adjusting mechanism.