Hybrid Drive Torque Coordination via Multi-Stage Segmentation
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Solution Overview
Problem
Existing methods for dynamic torque coordination in hybrid vehicle drives lack an overall concept that implements a specified overall target torque with high dynamics across a wide working range while considering fuel consumption, exhaust emissions, and service life.
Innovation Solution
A method with multiple successive coordination stages, each with an extended operating range, where requirements are prioritized by transferring demands between units if one unit cannot meet the target torque, utilizing internal combustion engines and electric machines with specific operating ranges and torque limitations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the internal combustion engine operates with efficiency-optimized base torque, then fuel consumption is minimized, but the torque setting speed is limited due to air path dynamics and throttle valve setting speed
Solution Approach 1:
The torque coordination is divided into multiple successive coordination stages, where the first stage handles efficiency-optimized operation and subsequent stages handle dynamic torque requirements. This segmentation allows the internal combustion engine to operate efficiently in its optimal range while the electric machine provides rapid torque supplementation when needed.
Solution Approach 2:
The electric machine acts as an intermediary between the internal combustion engine and the load, enabling rapid torque changes without compromising the engine's efficiency-optimized operation. The electric machine can quickly compensate for torque deficits when the engine cannot respond dynamically enough.
2Speed
If the electric machine provides temporary torque requirements, then torque dynamics are significantly improved, but the overall coordination concept across wide working range is lacking
Solution Approach 1:
The coordination concept dynamically adapts to different operating conditions through multiple coordination stages. Each stage is activated based on the current operating point and torque requirements, allowing the system to transition between efficiency-optimized operation and high-dynamics operation seamlessly across the entire working range.
Solution Approach 2:
The system changes operational parameters by switching between different coordination stages, each with specific operating ranges and control strategies. This allows the system to optimize for different priorities (efficiency vs. dynamics) depending on the current operating conditions.
3Adaptability or versatility
If multiple coordination stages with extended operating ranges are implemented, then total target torque is implemented with high dynamics across wide working range, but the system complexity increases
Solution Approach 1:
The coordination system is segmented into multiple successive stages, each responsible for a specific operating range and control priority. This segmentation allows comprehensive coverage of the entire working range while maintaining manageable complexity within each individual stage.
Solution Approach 2:
The system adds a temporal dimension to torque coordination by implementing successive coordination stages that are activated in sequence based on operating conditions. This multi-stage approach extends the system's adaptability across different operating scenarios without requiring complete redesign for each scenario.
Data Source
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AI summary
The invention relates to a method for the dynamic torque coordination of assemblies (2, 3) of a hybrid drive of a vehicle, in particular a motor vehicle. The method comprises several successive coordination stages, each coordination stage being assigned an operating range for at least one of the assemblies (2, 3). Each coordination stage, depending on a total target torque (tD) requested by the hybrid drive, places at least one demand on a first assembly and/or a second assembly. A subsequent coordination stage has an extended operating range compared to a preceding coordination stage, and if a demand cannot be met within the operating range of the assigned coordination stage, the subsequent coordination stage is applied. The invention further relates to a corresponding device.