Engine Torque Control Device Dynamic Threshold Adjustment
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Solution Overview
Problem
Existing engine control devices struggle to properly determine an excessive torque state, leading to either delayed fail-safe processes or unnecessary interventions that incongruously affect the driver's experience, due to the difficulty in setting a uniform standard for determining excessive torque.
Innovation Solution
An engine control device that adjusts its determination criterion for excessive torque based on vehicle speed-related parameters, such as accelerator operation amount and time thresholds, to differentiate between high and low-speed conditions, thereby suppressing unnecessary fail-safe processes when vehicle speed is high and inter-vehicle distance is large.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a uniform strict standard is used for determining excessive torque state, then the excessive torque state can be determined accurately, but the fail-safe process starts delayed reducing the effect of the fail-safe process
Solution Approach 1:
The patent applies dynamics by making the determination criterion for excessive torque state variable rather than fixed. The criterion changes dynamically based on vehicle speed: at high speeds, the criterion is relaxed (larger torque difference threshold), while at low speeds, the criterion is strict (smaller torque difference threshold). This dynamic adjustment allows the system to respond appropriately to different driving conditions, preventing both delayed response and unnecessary interventions.
2Loss of time
If a uniform loose standard is used for determining excessive torque state, then the fail-safe process can be started promptly, but the fail-safe process is performed even when the driver does not feel excessive acceleration giving a sense of incongruity
Solution Approach 1:
The determination criterion dynamically adapts to vehicle speed conditions. At high speeds where drivers expect and tolerate higher acceleration variations, the criterion is relaxed to avoid unnecessary fail-safe activations that would confuse the driver. At low speeds where drivers are more sensitive to acceleration changes, the criterion becomes strict to ensure timely detection of actual problems while maintaining driver comfort.
3Measurement precision
If the determination criterion is made strict, then the excessive torque state can be determined accurately, but unnecessary fail-safe processes occur at high speeds giving a sense of incongruity to the driver
Solution Approach 1:
The patent applies local quality by making the determination criterion location-specific to the operating condition (vehicle speed). Instead of using a single uniform threshold, the system uses different thresholds appropriate for different speed ranges. This ensures that the strictness of the criterion matches the local context: strict at low speeds where precision is critical, and relaxed at high speeds where false alarms would harm driver experience.
4Loss of time
If the determination criterion is made loose, then the fail-safe process can be started promptly, but the excessive torque state cannot be determined accurately leading to delayed fail-safe process
Solution Approach 1:
The system dynamically adjusts the determination criterion based on vehicle speed to balance responsiveness and accuracy. At low speeds, the strict criterion ensures accurate detection of excessive torque states. At high speeds, the relaxed criterion ensures prompt response while accounting for the reduced impact of torque excess on safety.
Data Source
AI summary
Determination criteria for an excessive torque state are changed based on a predetermined vehicle speed related parameter. The determination criteria are changed such that when the vehicle speed related parameter is a value corresponding to a relatively high vehicle speed state, the excessive torque state is difficult to determine compared to when the vehicle speed related parameter is a value corresponding to a relatively low vehicle speed state.