Partial Engine Operation Safety Fuel Cut-Off Avoidance
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Solution Overview
Problem
The frequent triggering of safety fuel cut-off in partial engine operation limits vehicle operation, particularly at low speeds, due to potential torque-increasing errors during cylinder deactivation in multi-cylinder internal combustion engines.
Innovation Solution
Transitioning the engine from partial engine operation to full engine operation upon detection of a torque-increasing error within a shorter switch-over debounce time, avoiding safety fuel cut-off by ensuring conditions that cause errors during full engine operation are not torque-increasing, and allowing later return to partial engine operation if errors persist beyond the cut-off debounce time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If safety fuel cut-off is triggered frequently during partial engine operation to ensure safety, then reliability is improved, but vehicle operation is limited and throttle response becomes reserved
Solution Approach 1:
The system dynamically adjusts engine operation mode based on detected errors. When a potentially torque-increasing error is detected during partial engine operation, the system transitions from a static safety cut-off approach to a dynamic mode switch, changing from partial to full engine operation to maintain both safety and performance
Solution Approach 2:
The system changes the operational parameters of the engine by switching between partial engine operation and full engine operation modes. This parameter change allows the engine to adapt its configuration based on detected errors, resolving the contradiction between safety monitoring and operational performance
2Reliability
If safety fuel cut-off is triggered immediately upon detecting potentially torque-increasing errors, then reliability is improved, but vehicle performance and operation at higher speeds are limited
Solution Approach 1:
The system takes preliminary action by switching to full engine operation before a safety fuel cut-off would occur. This preliminary mode transition prevents the need for immediate fuel cut-off while maintaining safety, allowing the engine to continue operating at full performance levels
Solution Approach 2:
The system converts the potentially harmful error condition into a beneficial operational change by switching to full engine operation. This transformation allows the error detection mechanism to trigger a performance-enhancing mode change rather than a performance-limiting fuel cut-off
3Productivity
If partial engine operation is maintained despite detecting potentially torque-increasing errors, then productivity is improved, but reliability deteriorates due to safety concerns
Solution Approach 1:
The system dynamically responds to error conditions by transitioning from partial to full engine operation, creating a flexible safety mechanism that adapts to detected issues while maintaining operational continuity and reliability
Data Source
AI summary
A method for operating an internal combustion engine that includes at least two cylinders, includes operating the internal combustion engine in a first operating mode in partial engine operation, in which at least one of the cylinders is not fired, monitoring the internal combustion engine during the partial engine operation for potentially torque-increasing errors, and switching over from the partial engine operation into a full engine operation in which all of the cylinders are fired when a potentially torque-increasing error is detected.