Ignition Timing Control for Turbocharged Engine Transient Response
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Solution Overview
Problem
Existing drive devices with internal combustion engines and gas exhaust turbochargers face challenges in rapidly increasing rotational speed due to 'turbo lag,' which results in delayed torque response and increased nitrogen oxide emissions, especially in diesel engines.
Innovation Solution
A method that involves fully opening the throttle valve and setting a first target ignition point later than the specified ignition point to build a torque reserve, followed by adjusting to an earlier second target ignition point to further increase torque, integrating turbocharger biasing with engine acceleration and optimizing ignition timing to enhance transient behavior and reduce emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the throttle valve is fully opened and ignition timing is delayed to build torque reserve, then the rotational speed increase becomes faster, but the nitrogen oxide emissions increase due to higher combustion temperatures
Solution Approach 1:
The method applies preliminary action by fully opening the throttle valve and delaying the ignition timing before the target torque is reached, building up a torque reserve in advance. This allows the engine to respond faster to torque requests while the ignition timing is subsequently optimized to reduce NOx emissions during the transient phase.
Solution Approach 2:
The invention implements dynamics by continuously adjusting the ignition timing based on the actual torque and target torque relationship. The ignition timing is delayed when building torque reserve and then advanced when approaching the target torque, creating a dynamic control strategy that adapts to the engine's transient state to balance speed response and emission control.
2Force
If the ignition timing is set earlier to increase torque, then the torque response improves, but the rotational speed increase is delayed due to turbo lag
Solution Approach 1:
The method uses preliminary action by fully opening the throttle valve before the target torque is reached, which reduces flow restrictions and allows the turbocharger to spool up faster. This preliminary throttle opening, combined with delayed ignition timing, builds torque reserve while overcoming turbo lag, enabling both improved torque response and faster rotational speed increase.
Solution Approach 2:
The invention applies parameter changes by dynamically modifying the ignition timing parameter based on the torque relationship. When actual torque is less than target torque, ignition timing is delayed to build reserve; when actual torque approaches target torque, ignition timing is advanced to maximize torque output, thereby coordinating torque generation with rotational speed increase.
3Reliability
If the ignition timing is continuously optimized during transient operation, then the transient behavior improves, but the control system complexity increases
Solution Approach 1:
The method implements feedback by continuously monitoring the relationship between actual torque and target torque, and adjusting the ignition timing accordingly. The control system uses the torque difference as feedback to determine whether to delay or advance ignition timing, creating a closed-loop control that optimizes transient behavior without requiring complex multi-parameter control strategies.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables faster rotational speed increase and improved transient behavior of the drive device while significantly reducing nitrogen oxide emissions, effectively addressing the 'turbo lag' issue and achieving better engine response without compromising nominal output.
Implementation Method 1
The turbine uses the enthalpy contained in the exhaust gas and/or the flow energy of the exhaust gas to operate the condenser
Implementation Method 2
The turbine uses the enthalpy contained in the exhaust gas and/or the flow energy of the exhaust gas to operate the condenser
Implementation Method 3
it thus brings it from a first pressure level to a higher second pressure level
Implementation Method 4
During the operation of the internal combustion engine it is necessary to ignite the fresh gas-fuel mixture introduced into at least one cylinder of the internal combustion machine
Data Source
AI summary
A method for operating a drive device with an internal combustion engine and an exhaust gas turbocharger associated with an internal combustion engine. The internal combustion engine is connected to an intake tract provided with a throttle valve. A specified ignition point is determined from a rotational speed of an internal combustion engine. At the same time with a target load jump of the internal combustion engine from an actual torque to a target torque with a full opening of the throttle valve by setting a first target ignition point which is later than the specified ignition point, a target reserve is built up and the actual torque is increased at the same time. The target reserve is used prior to reaching the target torque with the actual torque by setting a second target ignition point which is earlier than the first ignition point, and in addition is used to increase the actual torque.