Vehicle Driving Force Control Apparatus for Load Balancing
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Solution Overview
Problem
Existing vehicle driving force control systems fail to maintain suitable driving performance when one of the drive units enters a restriction-necessary state, leading to excessive load on other units and reduced total driving force, especially during rapid acceleration.
Innovation Solution
A vehicle driving force control apparatus that includes a controller and determiner to switch the upper limit values of driving force for both restricted and non-restricted drive units, from normal to low values when a restriction-necessary state is detected, ensuring balanced load distribution and maintaining high driving force output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the upper limit value of driving force for a restricted drive unit is lowered to continuous rating, then the restricted drive unit can operate safely, but the total driving force output of the vehicle is reduced
Solution Approach 1:
The patent combines the driving force output of multiple drive units (front motor and rear motor) to compensate for the reduction in one unit. When one drive unit is restricted, the other drive unit increases its output to make up for the loss, thereby maintaining the total driving force while ensuring the restricted unit operates safely within its continuous rating.
Solution Approach 2:
The patent dynamically changes the upper limit value parameter of the driving force based on the operational state of each drive unit. When a drive unit enters a restriction-necessary state, its upper limit value is switched from a higher value to the continuous rating value, while the other drive unit's upper limit value is adjusted accordingly to maintain overall vehicle performance.
2Reliability
If the upper limit value of driving force for one drive unit is restricted, then that drive unit operates within safe limits, but the other drive unit bears excessive load
Solution Approach 1:
The patent applies different upper limit value settings to different drive units based on their individual operational states. When one drive unit is restricted, the other drive unit is allowed to operate at a higher upper limit value to compensate, creating a localized adjustment that protects the restricted unit while preventing excessive load concentration on the other unit.
Solution Approach 2:
The control apparatus continuously monitors the operational state of each drive unit and dynamically adjusts the upper limit values based on feedback from temperature sensors and drive unit status. This feedback mechanism ensures that when one unit is restricted, the other unit's load is appropriately managed to prevent excessive stress.
3Reliability
If the upper limit value is switched from normal to low value, then driving force output is controlled within safe range, but acceleration performance is reduced
Solution Approach 1:
The patent implements dynamic adjustment of upper limit values rather than fixed restrictions. The control apparatus can switch between normal and low upper limit values based on real-time conditions, allowing the vehicle to maintain high acceleration performance when conditions permit while ensuring safe operation when drive units approach their thermal or operational limits.
Data Source
AI summary
A vehicle driving force control apparatus that is provided in a vehicle provided with drive units configured to drive a driving wheel, and that is configured to control the drive units includes: a controller; and a determiner. The controller controls a driving force output by each of the drive units, within a range less than or equal to an upper limit value, on a basis of a driving command. The determiner determines whether each of the drive units is in a restriction-necessary state.