Engine Torque Control via Transient Period Extension
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Solution Overview
Problem
Conventional engine torque control systems experience excessive torque variation and RPM fluctuations when transitioning between idle and part load states, leading to drivability issues and inefficient fuel consumption due to rapid changes in torque restriction and ignition timing.
Innovation Solution
An engine torque control apparatus and method that includes a driving request detecting unit, RPM detecting unit, torque arithmetic unit, air amount adjusting unit, ignition timing adjusting unit, and fuel amount adjusting unit, which analyze TPS signals to linearly set transient periods and torque restriction values, adjusting air amount, ignition timing, and fuel injection to stabilize engine torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If torque restriction amount is rapidly cancelled and ignition timing is rapidly advanced when converting from idle to part load state, then the engine responds quickly to load changes, but the transient period is too short causing excessive torque variation and RPM drop
Solution Approach 1:
The patent applies preliminary action by extending the transient period duration and gradually adjusting the torque restriction amount and ignition timing rather than making rapid changes. This allows the engine control system to prepare for and manage the transition smoothly, preventing excessive torque variation and RPM drop while still responding to load changes effectively.
2Speed
If torque restriction amount is rapidly applied and ISA air amount is rapidly increased when converting from part load to idle state, then the engine returns to idle quickly, but the transient period is too short causing excessive torque variation and RPM overshoot
Solution Approach 1:
The patent applies preliminary action by extending the transient period duration and gradually adjusting the torque restriction amount and ISA air amount during the transition from part load to idle state. This gradual adjustment prevents excessive torque variation and RPM overshoot while ensuring the engine returns to idle state in a controlled manner.
3Speed
If rapid adjustments of torque restriction and ignition timing are made during state transitions, then the control response is fast, but fuel consumption efficiency decreases due to RPM fluctuations
Solution Approach 1:
The patent applies preliminary action by extending the transient period and making gradual adjustments to torque restriction and ignition timing, which prevents RPM fluctuations that would otherwise cause inefficient fuel consumption. This approach maintains control responsiveness while improving fuel efficiency during state transitions.
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
Minimizes engine torque variation, prevents RPM drops and flares, and improves fuel efficiency by stabilizing engine torque control during state transitions from idle to part load and vice versa.
Implementation Method 1
an air amount adjusting unit that outputs an ISA PWM signal according to a control signal from the torque arithmetic unit and adjusts the air amount of the ISA on the basis of the variation in the load
Implementation Method 2
an ignition timing adjusting unit that advances or delays the ignition timing according to the control signal from the torque arithmetic unit on the basis of the variation in the load
Data Source
AI summary
Disclosed are an engine torque control apparatus and an engine torque control method that can stably control engine torque when a variation of a TPS signal converts from an idle state to a part load state or from the part load state to the idle state in an engine, in which an ISA is installed, thereby resolving a problem on drivability, such as a drop of an engine RPM and resolving a problem on drivability, such as flare of an engine RPM, and improving fuel consumption.