Vehicle Driving Force Control Device for Turbocharger Stagnation
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Solution Overview
Problem
Existing driving force control devices for vehicles with internal combustion engines, especially those equipped with turbochargers, suffer from response delays, leading to driver discomfort due to sudden increases in boost pressure, and often result in over-restriction of driving force, compromising acceleration performance and driveability.
Innovation Solution
A driving force control device that dynamically adjusts the rate of increase of the actual driving force based on the stagnation period, restricting the increase when the actual driving force stagnates relative to the required force, with a smaller rate of increase for longer stagnation periods to alleviate driver discomfort while maintaining acceleration performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the driving force is restricted uniformly or equally when stagnation is detected, then the driver's sense of strangeness or discomfort is alleviated, but the acceleration performance and driveability deteriorate due to excessive reduction of driving force
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the degree of driving force restriction based on the stagnation period duration. The controller calculates a restriction coefficient that varies with the stagnation period, applying stronger restriction for longer stagnation periods and weaker restriction for shorter periods. This resolves the contradiction by making the restriction adaptive rather than uniform, thereby alleviating driver discomfort while preserving acceleration performance.
Solution Approach 2:
The patent implements dynamics by transitioning from a static, uniform restriction approach to a dynamic, time-varying restriction strategy. The restriction coefficient is continuously updated based on the current stagnation period, allowing the system to adapt its behavior in real-time. This dynamic adjustment ensures that the driving force restriction is optimized for each specific stagnation scenario, balancing comfort and performance.
2Productivity
If the stagnation period threshold is set to a relatively long period for rapid acceleration, then the driving force is less likely to be restricted and acceleration performance is maintained, but the driver may experience strangeness or discomfort when the driving force rapidly rises
Solution Approach 1:
The patent changes the parameter of restriction strength based on the stagnation period duration. Instead of using a fixed threshold that prevents restriction during rapid acceleration, the system calculates a dynamic restriction coefficient that increases with the stagnation period. This allows the system to maintain acceleration performance for short stagnation periods while applying appropriate restriction for longer periods to prevent driver discomfort.
Solution Approach 2:
The patent implements feedback by continuously monitoring the stagnation period and using this information to adjust the driving force restriction in real-time. The controller calculates the current stagnation period, compares it with historical data, and dynamically adjusts the restriction coefficient accordingly. This feedback mechanism ensures that the system responds appropriately to varying acceleration conditions, maintaining performance while preventing discomfort.
3Object-affected harmful factors
If the stagnation period threshold is set to a relatively short period for slow acceleration, then the driving force is more likely to be restricted to prevent driver discomfort, but the acceleration performance and driveability deteriorate
Solution Approach 1:
The patent applies parameter changes by making the restriction coefficient dependent on the stagnation period duration. For slow acceleration with short stagnation periods, the restriction coefficient remains small, preserving acceleration performance. For faster acceleration with longer stagnation periods, the restriction coefficient increases to prevent driver discomfort. This parameter-based adaptation resolves the contradiction by matching the restriction strength to the specific driving condition.
Data Source
AI summary
A driving force control device includes a controller. The controller is configured to increase driving force of a vehicle in accordance with a driver's operation to request acceleration. The controller is configured to restrict subsequent increase of the actual driving force when it determines that increase of actual driving force of the vehicle stagnates, relative to required driving force determined according to at least the driver's operation to request acceleration. The controller is configured to restrict the increase of the actual driving force so that a rate of increase of the actual driving force is reduced as a stagnation period for which the increase of the actual driving force stagnates is longer.