Hybrid Vehicle Damping Control Device Torque Responsiveness
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Solution Overview
Problem
Conventional damping control devices for hybrid vehicles experience divergence between actual and target driving torque, leading to discomfort for the driver due to the dulling effect of feed forward control on output torque responsiveness.
Innovation Solution
A damping control device for hybrid vehicles that includes a target driving torque change amount calculation unit, a target motor torque change amount calculation unit, and a damping rate variation mechanism, which adjusts the damping rate based on the positivity or negativity of both change amounts to improve responsiveness by switching between first and second damping rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If feed forward control is used to suppress vibration by attenuating target motor torque, then vibration suppression is improved, but motor torque responsiveness deteriorates
Solution Approach 1:
The damping rate in the feed forward control is made variable rather than fixed. The control device dynamically adjusts the damping rate based on the sign agreement between target driving torque change amount and target motor torque change amount, allowing the system to adapt between vibration suppression and responsiveness based on operating conditions
Solution Approach 2:
The damping rate parameter is changed based on the relationship between torque change amounts. When signs agree, a larger damping rate is applied for vibration suppression; when signs disagree, a smaller damping rate is applied to maintain responsiveness, thus optimizing performance across different operating scenarios
2Object-affected harmful factors
If damping rate is increased to suppress vibration, then vibration suppression is improved, but divergence between actual and target driving torque increases
Solution Approach 1:
The damping rate is dynamically adjusted based on real-time torque change analysis. By switching between different damping rates according to sign agreement, the system maintains torque accuracy when responsiveness is critical while achieving vibration suppression when conditions are favorable
Solution Approach 2:
The control device uses feedback from torque change amount calculations to adjust the damping rate. By monitoring the relationship between target driving torque change and target motor torque change, the system selects appropriate damping rates to prevent excessive divergence while maintaining vibration suppression
Data Source
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AI summary
In order to provide a damping control device for a hybrid vehicle, a device making it possible to suppress behavior that differs from a request of a driver, the behavior being caused by a divergence between actual driving torque and a target driving torque of a vehicle, and to suppress a sense of discomfort imparted to the driver, the present invention provides a damping control device for a hybrid vehicle, the device being characterized by having: a target driving torque change amount calculation unit (901) that calculates the amount of change in a target driving torque; a target motor torque change amount calculation unit (902) that calculates the amount of change in a target motor torque; and a damping rate variation unit (40) that sets the damping of a feed forward control unit (31) to a first damping rate when the target driving torque change amount and the target motor torque change amount both are positive or negative, and to a second damping rate, which is smaller than the first damping rate, when the target driving torque change amount and the target motor torque change amount have opposite positivity or negativity.