Engine Control Apparatus Torque Correction for Starting Performance
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Solution Overview
Problem
Existing engine control systems face challenges in achieving excellent starting performance across various modes, often resulting in either insufficient or excessive torque, particularly when transitioning between economy and power modes.
Innovation Solution
An engine control apparatus that includes a mode determining unit, vehicle speed detecting unit, and required output detecting unit, which adjusts the target output by correcting the output performance in either the high output or output restricted mode based on vehicle speed and required output, ensuring optimal torque delivery regardless of the selected mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If economy mode is selected with restricted output to reduce fuel consumption, then fuel economy performance is improved, but starting performance on steep grades deteriorates due to insufficient torque
Solution Approach 1:
The engine control apparatus dynamically adjusts the target output based on vehicle speed and required output conditions, even when economy mode is selected. The correcting unit modifies the target output upward when vehicle speed is low and required output is large, ensuring sufficient starting torque while maintaining economy mode's fuel-saving characteristics during normal operation.
Solution Approach 2:
The system changes the target output parameter dynamically based on operating conditions (vehicle speed and required output). When vehicle speed is low and required output is large, the target output is corrected to a higher value than the economy mode would normally provide, enabling sufficient starting performance without permanently altering the economy mode's fuel-efficient characteristics.
2Power
If power mode is selected with high output to increase acceleration response, then driving performance is improved, but starting performance on level ground deteriorates due to excessive torque and sudden start shock
Solution Approach 1:
The system dynamically adjusts the target output based on real-time vehicle speed and required output conditions. When vehicle speed is low and required output is small, the correcting unit reduces the target output below what power mode would normally provide, preventing excessive torque and sudden start shock while maintaining the ability to deliver high power when needed.
Solution Approach 2:
The target output parameter is dynamically changed based on operating conditions. When vehicle speed is low and required output is small, the target output is corrected to a lower value than power mode would normally provide, ensuring smooth starting. The system thus adapts the power delivery characteristics to match actual driving needs rather than maintaining fixed power mode characteristics.
3Reliability
If fixed control mode characteristics are used, then mode-specific performance is optimized, but starting performance across all modes deteriorates due to inability to adapt to actual driving conditions
Solution Approach 1:
The correcting unit continuously monitors vehicle speed and required output conditions, and adjusts the target output accordingly. This feedback mechanism allows the system to adapt the starting performance to actual driving conditions while respecting the selected control mode's overall characteristics, combining mode-specific optimization with condition-based adaptability.
Solution Approach 2:
The target output correcting unit serves multiple functions: it enhances starting performance in economy mode when needed, suppresses excessive torque in power mode during light acceleration, and adapts to various driving conditions universally. This single correcting mechanism provides multi-functional adaptation across different control modes and driving scenarios.
Data Source
AI summary
An engine control apparatus of the present invention sets a target torque τe, when the save mode m2 is set as an engine mode, according to the formula:τe←TRQ2*RATIO1+TRQ3*(1−RATIO1)Basic target torque TRQ2 and TRQ3 are set based on the engine speed Ne and the throttle opening-degree θacc and with reference to the normal mode map Mp1 and the power mode map Mp3 respectively. The correction factor RATIO1 is an addition rate which is set based on an accelerator opening-degree θacc and a vehicle speed V and with reference to a correction factor map Mr1. The correction factor map Mr1 stores a correction factor RATIO1 near 0 (although 1≧RATIO1>0) when the vehicle speed V is low and the accelerator opening-degree θacc is high.