Multi-mode Powertrain Intake Manifold Pump Down Control
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Solution Overview
Problem
Multi-mode powertrain systems face challenges in efficiently managing engine intake manifold pressure and fueling to optimize torque transfer and fuel economy, particularly during deceleration and refueling processes, due to complexities in balancing torque requests, battery state, and system constraints.
Innovation Solution
The implementation of a dynamic control method that enables an engine intake manifold pump down mode and aborts it based on intake manifold pressure and system constraints, allowing for optimized fueling and torque management by controlling the engine and torque machines to minimize pumping losses and ensure smooth transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the engine intake manifold pump down mode is executed to reduce pumping losses, then fuel efficiency is improved, but the engine may not be ready for timely refueling and torque response
Solution Approach 1:
The system performs preliminary actions by monitoring engine conditions (intake manifold pressure, engine speed, torque requests) before initiating the pump down mode. The control system determines optimal timing to enter and exit pump down mode in advance, ensuring the engine can respond timely to refueling needs while maximizing pumping loss reduction during appropriate periods.
Solution Approach 2:
The control system dynamically adjusts the pump down mode operation based on real-time engine conditions, torque requests, and system constraints. The mode can be entered and exited dynamically, with the controller continuously evaluating whether to maintain pump down mode or transition to fueling mode based on current operating conditions, creating an adaptive response to changing demands.
2Use of energy by moving object
If the pump down mode is maintained for extended periods to maximize fuel economy, then energy efficiency improves, but system constraints and torque requests may not be met
Solution Approach 1:
The control system implements feedback mechanisms by continuously monitoring engine conditions, torque requests from the operator, and system constraints. The controller uses this feedback to determine when to exit pump down mode and resume fueling, ensuring that torque requests are met while maximizing fuel economy during periods when pump down mode is appropriate. The system adjusts operation based on real-time feedback about system state and performance requirements.
Solution Approach 2:
The system changes operating parameters dynamically by transitioning between pump down mode (intake manifold at reduced pressure) and fueling mode (intake manifold at normal pressure). The controller adjusts key parameters including intake manifold pressure, fuel injection status, and mode transition timing based on engine speed, torque requests, and system constraints, optimizing the balance between fuel economy and performance requirements.
Data Source
AI summary
A multi-mode powertrain system includes a transmission configured to transfer torque among an internal combustion engine, torque machines and an output member. A method for controlling the powertrain system includes operating the multi-mode powertrain system to execute an engine intake manifold pump down mode, and aborting the engine intake manifold pump down mode and fueling the engine, wherein aborting is based upon intake manifold pressure and system constraints.