Hybrid Vehicle Torque Control Method for TCS Noise Reduction
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Solution Overview
Problem
Hybrid vehicles face issues with torque reduction control, leading to abnormal engine noise and battery state of charge (SOC) deterioration, as existing systems rely heavily on motor torque after engine torque depletion, causing inefficient battery usage and impaired driving performance.
Innovation Solution
A method for controlling torque reduction in hybrid vehicles that determines discharging and charging torque control factors based on battery SOC, calculating motor and engine torques to maintain a target SOC that prevents abnormal noise and ensures efficient battery usage, thereby improving driving performance and reducing engine noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the hybrid vehicle decreases engine torque first and then motor torque to satisfy TCS torque reduction request, then the TCS torque reduction request is satisfied, but the battery SOC runs out due to continuous motor use and output performance deteriorates
Solution Approach 1:
The patent changes the control parameters by determining discharging torque control factor and charging torque control factor based on battery SOC and threshold SOC. When SOC is below threshold, the system prioritizes motor torque reduction with discharging factor of 0 or close to 0. When SOC is above threshold, the system allows engine torque reduction with discharging factor between 0 and 1, thereby adapting the torque distribution strategy to battery state to prevent SOC depletion while maintaining TCS effectiveness.
Solution Approach 2:
The patent implements dynamic torque distribution strategy where the control factors are adjusted in real-time based on current SOC level. The system transitions from motor-only torque reduction (when SOC is low) to combined engine-motor torque reduction (when SOC is high), making the torque control strategy flexible and adaptive to battery state rather than following a fixed sequence.
2Reliability
If the hybrid vehicle continuously uses motor torque to satisfy TCS torque reduction request, then the TCS torque reduction request is satisfied, but the driver's demand torque cannot be satisfied and the vehicle cannot start smoothly
Solution Approach 1:
The patent adjusts the discharging torque control factor based on SOC levels to optimize the balance between TCS torque reduction and vehicle acceleration performance. When SOC is sufficient (above threshold), the discharging factor is set between 0 and 1, allowing the engine to contribute to torque reduction while preserving motor torque for acceleration, thus maintaining both TCS effectiveness and vehicle productivity.
Solution Approach 2:
The system dynamically switches between different torque control modes based on real-time SOC monitoring. This dynamic adaptation ensures that when battery charge is sufficient, the system can afford to reduce engine torque more aggressively while keeping motor torque available for performance needs, thereby maintaining acceleration capability during TCS operation.
3Reliability
If the hybrid vehicle relies heavily on motor torque after engine torque depletion, then the TCS torque reduction request is satisfied, but abnormal engine noise occurs and driving stability deteriorates
Solution Approach 1:
The patent introduces SOC-based threshold comparison to dynamically adjust torque control factors, preventing the system from depleting engine torque completely and then relying excessively on motor torque. By setting discharging factor between 0 and 1 when SOC is above threshold, the system maintains a balanced torque distribution that avoids abnormal engine noise while achieving TCS torque reduction.
Solution Approach 2:
The system continuously monitors battery SOC and uses this feedback to adjust the torque control strategy in real-time. This closed-loop control ensures that torque distribution decisions are based on current battery state, preventing conditions that lead to abnormal engine noise and maintaining driving stability throughout TCS operation.
Data Source
AI summary
A method for controlling torque reduction of a hybrid vehicle includes: determining a discharging torque control factor of a motor and a charging torque control factor of the motor based on a current state of charge of a battery that supplies electric power to the motor and a threshold state of charge of the battery; calculating a torque of the motor corresponding to driving torque reduction request of a traction control system (TCS) based on a discharging limit torque of the motor that the discharging torque control factor is reflected in and a charging limit torque of the motor that the charging torque control factor is reflected in; and calculating a torque of the engine corresponding to the driving torque reduction request based on the calculated torque of the motor and a request torque of the traction control system.