Powertrain Control System for Torque Response Delay
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Solution Overview
Problem
Existing powertrain systems face challenges in determining optimal manipulated variables for torque devices with different responsiveness, leading to increased calculation load and reduced versatility in achieving target state quantities within constraints.
Innovation Solution
A powertrain system with a control device that solves a linear programming problem to determine manipulated variables for multiple torque devices, including a manipulated variable correction section to account for response delays, allowing for optimal achievement of target state quantities while reducing calculation load and enhancing versatility across different configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a linear programming problem is solved to determine optimal manipulated variables for multiple torque devices, then the target state quantities are maximally achieved within constraints, but the calculation load increases when torque devices with different responsiveness are included
Solution Approach 1:
The patent segments the manipulated variables into two groups: fast-response variables (electric motor torque) and slow-response variables (engine torque). By dividing the optimization problem into segments based on response characteristics, the system can apply different handling strategies to each group, reducing overall calculation complexity while maintaining optimization precision.
Solution Approach 2:
The patent performs preliminary calculation of the fast-response manipulated variable based on the current state and target state quantities. This preliminary action allows the slow-response variable to be determined subsequently with reduced computational burden, as the fast-response component is already accounted for. This sequential approach prevents the need for full simultaneous optimization of all variables.
2Measurement precision
If manipulated variables are determined by solving linear programming problems multiple times to account for response delays, then accuracy is improved, but the amount of calculation increases
Solution Approach 1:
The patent calculates the fast-response manipulated variable in advance based on current conditions and target values. This preliminary calculation incorporates the expected response delay effects, allowing the subsequent determination of slow-response variables to proceed with reduced iteration requirements. The fast-response variable serves as a pre-computed reference that accounts for timing differences.
Solution Approach 2:
The patent dynamically adjusts the optimization approach based on the response characteristics of different torque devices. Fast-response devices are handled with predictive calculations that anticipate their rapid adjustment capability, while slow-response devices use the preliminary results as constraints. This dynamic handling reduces the number of recalculation cycles needed compared to uniform treatment of all devices.
Data Source
AI summary
In a powertrain system including a first torque device and a second torque device having a larger response delay, a control device is configured to act as: a manipulated variable determination section that solves a linear programming problem to determine and output manipulated variables that maximally achieve target state quantities within a plurality of constraints; and a torque device control section. The plurality of constraints include, as upper and lower limit constraint values of the second manipulated variable, a maximum value and a minimum value of the second manipulated variable attainable at the next time step. The control device is further configured to act as a manipulated variable upper and lower limit calculation section that calculates, as the upper and lower limit constraint values, the above-described maximum value and the minimum value, based on the current rotational speed and estimated manipulated variable of the second torque device.