Hybrid Drive Control Anticipating Torque Deficiencies
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Solution Overview
Problem
Hybrid vehicles with dual motorizations face delays in delivering additional torque, leading to unpleasant and potentially dangerous situations when the active motorization cannot meet driver requests for acceleration, especially in conditions like obstacles or steep slopes, due to the start-up time of the additional motorization.
Innovation Solution
A method that calculates a theoretical vehicle acceleration based on the torque applied by the active motorization and compares it with the actual acceleration, triggering the activation of the additional motorization if a shift beyond a threshold is detected, allowing for anticipatory preparation and engagement of the additional engine to address torque deficiencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the additional motorization is activated only when needed, then energy consumption is reduced, but torque delivery delay occurs
Solution Approach 1:
The control system performs preliminary actions by calculating theoretical acceleration and comparing it with actual acceleration to detect torque deficiencies before they become critical. This allows the additional motorization to be activated in advance when needed, rather than waiting for the deficiency to manifest as a problem.
Solution Approach 2:
The system continuously monitors vehicle acceleration by comparing theoretical acceleration (calculated from active motorization torque) with actual measured acceleration. This feedback mechanism detects when the active motorization cannot meet acceleration demands, triggering activation of the additional motorization to compensate for torque deficiencies.
2Loss of time
If the additional motorization is activated in advance, then torque delivery delay is reduced, but energy consumption increases
Solution Approach 1:
The system performs preliminary calculations of theoretical acceleration and compares it with actual acceleration to detect torque deficiencies in advance. This allows for timely activation of the additional motorization only when the comparison indicates a deficiency, avoiding premature activation and unnecessary energy consumption.
Solution Approach 2:
Continuous feedback through acceleration monitoring enables the system to activate the additional motorization at the optimal moment - just when torque deficiency is detected - rather than keeping it continuously activated. This feedback-driven approach minimizes energy consumption while ensuring timely torque delivery.
3Device complexity
If the active motorization alone is used, then device complexity is reduced, but acceleration performance becomes insufficient
Solution Approach 1:
The control system integrates two different motorizations (thermal engine and electric traction machine) with different starting characteristics into a single multi-functional propulsion system. The thermal engine provides sustained torque while the electric machine delivers immediate torque, and the control system manages both to achieve both low-speed and high-speed acceleration performance.
Solution Approach 2:
The patent combines two motorizations with complementary characteristics into a unified propulsion system. The electric traction machine merges with the thermal engine to provide immediate torque supplementation, creating a hybrid system that leverages the strengths of both power sources to achieve superior acceleration performance.
Data Source
Figure 1
AI summary
Method for controlling the drive of a vehicle that has at least two drive systems for traction, an active drive system (12) and a complementary drive system (4) which, in a deactivated state, has a preparation lead-time before it can deliver a torque, characterized in that with the active drive system (12) applying a toque (C2) to the wheels to allow the vehicle to drive along, and with the complementary drive system (4) deactivated, it calculates a theoretical acceleration of the vehicle (Aveh theoretical) which is dependent on the torque (C2) applied by this active drive system (12), on the speed of the vehicle (V), and the driving conditions (F0, Fl, F2), then it compares this with the measured actual acceleration of this vehicle (Aveh actual) and if it detects a discrepancy higher than a threshold value, it immediately commands activation of the complementary drive system (4).