Hybrid Vehicle Torque Control via Acceleration Potential Estimation
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Solution Overview
Problem
In hybrid vehicles, the current method of using energy stored in energy storage means to provide additional torque results in unnecessary consumption when the additional acceleration induced is not strong enough to be felt by the driver, especially at high speeds, leading to inefficient energy use.
Innovation Solution
A control method that estimates the acceleration potential based on various vehicle parameters, such as speed, gear, slope, weight, and operating mode, to determine if additional torque from the non-thermal driving machine should be supplied, ensuring it is only used when beneficial, thereby avoiding unnecessary energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If additional torque is supplied by the non-thermal driving machine to satisfy driver acceleration requests, then driver satisfaction and acceleration performance are improved, but energy consumption from the storage means increases unnecessarily when the acceleration effect is not noticeable
Solution Approach 1:
The system changes the control parameter from a fixed threshold-based approach to a dynamic acceleration potential estimation based on multiple vehicle parameters (speed, gear, slope, weight, operating mode). This allows the system to adapt torque supply decisions to actual vehicle conditions, avoiding energy waste when acceleration effect is negligible.
Solution Approach 2:
The system implements feedback by continuously monitoring vehicle parameters and estimating acceleration potential to determine whether additional torque should be supplied. The control decision is based on real-time assessment of whether the acceleration effect will be noticeable to the driver, creating a closed-loop control system that optimizes energy usage.
2Power
If all available energy from the storage means is made available to the non-thermal driving machine, then acceleration capability is maximized, but energy is wasted in situations where additional acceleration is not felt by the driver
Solution Approach 1:
Instead of always supplying maximum available torque, the system applies partial action by selectively supplying additional torque only when the estimated acceleration potential exceeds a threshold. This avoids excessive energy consumption in situations where full torque would not provide noticeable acceleration benefit.
Solution Approach 2:
The control strategy changes from a static 'all-or-nothing' energy deployment approach to a dynamic parameter-based decision system that evaluates vehicle speed, gear, slope, weight, and operating mode to determine optimal torque supply levels.
3Ease of operation
If additional torque is supplied at high vehicle speeds, then the system responds to driver acceleration requests, but the induced acceleration is not strong enough to be felt by the driver resulting in unnecessary energy consumption
Solution Approach 1:
The system uses feedback from vehicle speed and other parameter sensors to estimate acceleration potential and determine whether additional torque will produce a noticeable effect. At high speeds where acceleration effects are less noticeable, the system adjusts its torque supply decisions accordingly.
Solution Approach 2:
The control system adapts its behavior based on vehicle speed parameter, recognizing that acceleration effects diminish at higher speeds. The acceleration potential estimation incorporates speed-dependent factors to avoid unnecessary torque supply when the physical effect would be imperceptible to the driver.
Data Source
AI summary
A control method is implemented in a vehicle (V) comprising an energy storage means (MS1) having an available power, and a heat engine (MT) and a non-heat-type drive machine (MM) supplying respectively torques for at least one train (T1) by consuming respectively fuel and power from this energy storage means (MS1). This method comprises a step in which it is estimated, when only the heat engine (MT) supplies a torque, a value representative of an acceleration potential of the vehicle (V) in the case of supply of a complementary torque by the non-heat-type drive machine (MM), depending on at least one parameter of the vehicle (V), and this supply of complementary torque is authorised when this estimated value is greater than a chosen threshold.