Vehicle Torque Distribution and Suspension Pitching Control
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Solution Overview
Problem
Existing vehicle systems fail to effectively control and generate desired pitching during vehicle turning, which affects steering responsiveness and stability.
Innovation Solution
A vehicle system with a torque distribution mechanism that adjusts torque between the front and rear wheels based on steering angle, using a controller to increase rear wheel torque during turning, and a suspension design that generates a nose-dive pitching moment, enhancing steering responsiveness and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If torque distribution is controlled to suppress pitching during straight vehicle traveling, then pitching suppression is improved, but steering responsiveness deteriorates
Solution Approach 1:
The patent applies dynamics by making the torque distribution control adaptive to different vehicle states. The controller dynamically adjusts torque distribution based on whether the vehicle is in straight traveling or turning, transitioning between suppression mode and responsiveness enhancement mode. This resolves the contradiction by making the system behavior conditional rather than fixed.
Solution Approach 2:
The patent changes the torque distribution parameters based on vehicle operating conditions. During straight traveling, the system optimizes for pitching suppression, while during turning operations detected via steering angle sensor, it shifts to enhance steering responsiveness. This parameter adaptation allows the system to optimize for different priorities depending on the current state.
2Ease of operation
If torque distributed to rear wheel is increased during steering wheel turning, then steering responsiveness is improved, but vehicle stability may deteriorate
Solution Approach 1:
The patent applies local quality by selectively increasing torque only to the rear wheels during turning operations, rather than uniformly affecting the entire vehicle. This localized torque application at the rear axle creates the desired nose-dive pitching effect and improves steering responsiveness without compromising overall vehicle stability. The control is spatially differentiated.
3Stability of the object's composition
If conventional torque distribution control is used, then pitching suppression during straight traveling is achieved, but positive control of pitching during turning is not possible
Solution Approach 1:
The patent makes the torque distribution mechanism universal by enabling it to perform multiple functions: suppressing pitching during straight traveling and positively controlling pitching during turning operations. The same basic control system adapts its behavior based on steering angle input, making it versatile across different driving scenarios rather than limited to a single function.
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 system improves steering responsiveness by generating nose-dive pitching and stabilizes the vehicle during steady turning by adjusting torque distribution and suspension forces.
Implementation Method 1
a force to drive the rear wheel forwardly is transmitted from the rear wheel to the vehicle body through the suspension device
Implementation Method 2
since the suspension device is configured to extend obliquely upwardly from the center axis of the rear wheel toward the attachment portion to the vehicle body, an upward element of the above-described force to drive the rear wheel forwardly is generated at the vehicle body
Implementation Method 3
a torque distributing mechanism to distribute a torque of the power source to the front wheel and the rear wheel
Implementation Method 4
the coupling device which comprises an input shaft through which the torque is transmitted from a front-wheel side and an output shaft through which the torque is transmitted to a rear-wheel side and is configured such that a rotational speed of the output shaft is lower than a rotational speed of the input shaft
Data Source
AI summary
A vehicle system comprises an engine driving a vehicle, a front wheel and a rear wheel, a suspension device with an attachment portion to a vehicle body which is located at a higher level than a center axis of the rear wheel, an electromagnetic coupling to distribute a torque of the engine to the front wheel and the rear wheel, a steering wheel to be operated by a driver, a steering angle sensor to detect a steering angle corresponding to operation of the steering wheel, and a controller to control the engine and the electromagnetic coupling. The controller is configured to control the electromagnetic coupling such that the torque distributed to the rear wheel is increased in accordance with turning operation of the steering wheel which is detected by the steering angle sensor.