Hybrid Vehicle Torque Coordination During Shifting
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Solution Overview
Problem
Existing hybrid vehicles do not effectively address torque loss during shifting, leading to poor dynamic performance, as they fail to coordinate torque between the front-axle engine and rear-axle motor, resulting in suboptimal driving experience and fuel efficiency.
Innovation Solution
A hybrid vehicle torque adjusting method and device that acquires and filters requested torques for both the front-axle engine and rear-axle motor, determining compensation torques to coordinate torque delivery, ensuring the rear-axle motor compensates for differences between requested and actual output torques, thereby improving dynamic performance and fuel efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If torque coordination between front-axle engine and rear-axle motor is not implemented, then the system structure remains simple, but torque loss during shifting occurs and dynamic performance deteriorates
Solution Approach 1:
The patent implements a torque coordination control system that continuously monitors the requested torque of the front-axle engine and the actual output torque of the front-axle transmission, calculates the torque loss during shifting, and compensates for it by adjusting the target torque of the rear-axle motor. This closed-loop feedback mechanism ensures accurate torque compensation while maintaining system reliability and dynamic performance.
2Reliability
If torque compensation is not applied during shifting, then the control algorithm remains simple, but torque loss occurs and dynamic performance is poor
Solution Approach 1:
The patent applies preliminary action by detecting shift requests in advance and pre-calculating the torque loss compensation before the shifting process completes. The control algorithm identifies when a shift is about to occur or is occurring, computes the expected torque loss based on the difference between requested and actual output torque, and adjusts the rear-axle motor torque accordingly to maintain smooth power delivery throughout the shifting process.
3Reliability
If the rear-axle motor compensates for torque loss during shifting, then dynamic performance improves, but the control system complexity increases
Solution Approach 1:
The patent uses the rear-axle motor as an intermediary to compensate for torque loss during front-axle transmission shifting. Instead of directly controlling the front-axle transmission torque, the system calculates the torque loss and has the rear-axle motor provide compensatory torque. This intermediary approach allows torque coordination between the two axles, improving dynamic performance while keeping the control system manageable through modular torque adjustment.
Data Source
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AI summary
Disclosed are a hybrid vehicle torque adjusting method and device. The method includes: acquiring a requested torque of a front-axle engine and a requested torque of a rear-axle motor, determining a first compensation torque according to the filtered requested torque of the front-axle engine and an actual output torque of a front-axle transmission, and determining a target torque of the rear-axle motor according to the first compensation torque and the requested torque of the rear-axle motor. In the hybrid vehicle torque adjusting method according to the disclosure, since a difference exists between the filtered requested torque of the front-axle engine and the actual output torque of the front-axle transmission during shifting of the front-axle transmission, after the difference is compensated by the rear-axle motor, a working condition that affects a dynamic performance of an entire vehicle can be eliminated, torques can be coordinated according to a status of the entire vehicle, and the dynamic performance of the entire vehicle can be improved based on original fuel saving.