Vehicle Torque Control for Grille Shutter Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional vehicle attitude control systems are influenced by the opening of the grille shutter, leading to inconsistent vehicle response and steering stability during steering operations, causing driver discomfort due to changes in aerodynamic lift and cornering force.
Innovation Solution
A control system that includes a driving force source, a steering angle sensor, and a controller that adjusts torque to control vehicle attitude based on steering angle, increasing torque reduction when the grille shutter is open to maintain consistent response and stability, regardless of grille shutter opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the opening of the grille shutter is increased to improve fuel efficiency and temperature control, then the aerodynamic lift on the vehicle front part increases, but the load of the front wheels decreases and the cornering force decreases, causing inconsistent vehicle response and steering stability
Solution Approach 1:
The control device changes the parameter of driving force reduction amount based on the grille shutter opening amount. When the grille shutter opening is large, the control device increases the driving force reduction amount during steering to compensate for the decreased front wheel load and maintain consistent cornering force and steering stability.
2Temperature
If the opening of the grille shutter is changed to adjust engine bay temperature, then the pressure inside the engine bay changes, but the aerodynamic lift changes and the cornering force changes, causing vehicle response to be inconsistent with steering operation
Solution Approach 1:
The control device adjusts the driving force reduction parameter based on the detected grille shutter opening amount. By dynamically changing the driving force reduction amount according to the grille shutter state, the control device compensates for the cornering force changes caused by aerodynamic lift variations, maintaining consistent vehicle response to steering operations.
3Speed
If the reduction of driving force by vehicle attitude control is reduced when the grille shutter opening increases to maintain deceleration, then the load of front wheels further decreases, but the cornering force decreases and steering stability is compromised
Solution Approach 1:
The control device inverts the conventional approach by increasing the driving force reduction amount when the grille shutter opening is large. This parameter change compensates for the load decrease on front wheels caused by increased aerodynamic lift, maintaining the cornering force necessary for stable steering and consistent vehicle response.
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 ensures consistent vehicle response and steering stability by adjusting torque to counteract changes in aerodynamic lift, improving maneuverability and stability during turning operations without being affected by grille shutter opening.
Implementation Method 1
a controller configured to control the torque generated by the driving force source to control a vehicle attitude based on the steering angle related value
Implementation Method 2
a grille shutter configured to adjust an opening-and-closing degree of an opening formed in a front surface of a body of the vehicle, and a controller configured to control an amount of external air flowing into an engine bay according to an opening-and-closing degree of the grille shutter
Implementation Method 3
when the opening of the grille shutter is changed and the amount of the external air flowing into the engine bay is changed, the pressure inside the engine bay is changed with the change in the traveling air resistance, and therefore, the aerodynamic lift which biases a front part of the vehicle upward changes
Data Source
AI summary
A control system for a vehicle is provided, which includes a driving force source configured to generate torque for driving drive wheels, a steering angle related value sensor configured to detect a steering angle related value of a steering device of the vehicle, a grille shutter configured to adjust an opening-and-closing degree of an opening formed in a front surface of a vehicle body, and a controller configured to control the torque to control a vehicle attitude based on the steering angle related value. Based on the steering angle related value, when the controller determines that a turning operation of the steering device is performed, it performs a torque decreasing control for reducing the torque to add deceleration to the vehicle, and when the grille shutter opening is large, the controller increases the torque reduction amount in the torque decreasing control more than when the opening is small.