Torque Control Filter for Hybrid Drive Drivability
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Solution Overview
Problem
Existing drive systems for motor vehicles struggle to maintain consistent drivability and dynamic behavior across different operating modes, particularly due to the distinct dynamic behaviors of internal combustion engines and electric motors, leading to varying responses to driver-requested torque.
Innovation Solution
A method and device that determine a driver-requested torque value and adjust control signals using filters and final control elements to align the actual torque produced by the internal combustion engine with the desired torque, allowing for consistent drivability by influencing both the air path and fast path of the engine, with the aid of a higher-order low-pass filter and regulator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If different control strategies are used for internal combustion engine and electric motor operating modes, then each mode can be optimized for its specific dynamic behavior, but the drivability becomes dependent on the operating mode
Solution Approach 1:
The control system dynamically adapts the filtering parameter based on the actual torque produced by the internal combustion engine. The control device determines a parameter value for a filter that influences the setpoint torque calculation, and this parameter is adjusted according to the specific operating conditions and actual torque output, allowing the system to maintain consistent drivability across different operating modes while accounting for their distinct dynamic characteristics
Solution Approach 2:
The system uses feedback from the actual torque produced by the internal combustion engine to adjust the filter parameter. The control device continuously monitors the actual torque and modifies the filtering parameter accordingly, creating a closed-loop control system that ensures consistent drivability regardless of whether the system is operating in internal combustion engine mode or electric motor mode
2Stability of the object's composition
If the setpoint torque is filtered to smooth transitions, then the torque control becomes more stable, but the responsiveness to driver inputs is reduced
Solution Approach 1:
The filtering parameter is not fixed but is dynamically adjusted based on the actual torque produced by the internal combustion engine. This allows the system to optimize the balance between smoothing and responsiveness in real-time, adapting the filter characteristics to current operating conditions rather than using a static filtering approach
Solution Approach 2:
The system changes the parameter value of the filter based on the actual torque and operating mode. By adjusting the filtering parameter dynamically, the system can modify the degree of smoothing applied to the setpoint torque, allowing for both stable control and adequate responsiveness depending on the specific operating situation
Data Source
AI summary
In a first operating mode, as a function of the determined torque request value at least one first final control element is actuated influencing an air path of an engine. Representative of an actual basic torque value, a specific engine characteristic value is determined as a function of which, a filter parameter value is determined such that a torque setpoint value is brought closer to the actual basic torque value. The filter parameter value is saved assigned to the specific characteristic value. In a second operating mode, the filter parameter value is determined as a function of the specific characteristic value and the setpoint torque value is predefined by filtering the driver-requested torque value as a function of the determined parameter value. As a function of the predefined setpoint torque value, at least one second final control element is actuated which influences the drive system torque outside the air path.