Hybrid Engine False Start Prevention Control
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Solution Overview
Problem
In hybrid vehicles with mechanically coupled internal combustion engines and electric machines, malfunctions in the electric machine control part or current converter can lead to unauthorized starts and continued running of the internal combustion engine, posing a safety risk due to delayed intervention by the monitoring part and unintended fuel feed or ignition enablement.
Innovation Solution
An engine false start prevention part identifies transitions from a stationary to a running state and checks if a proper start was demanded within a predetermined period, preventing fuel feed and ignition enablement for a duration at least as long as the reaction period to prevent unauthorized engine starts, allowing the monitoring part to intervene and stop erroneous torque production by the electric machine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the monitoring part takes over control functions after detecting a malfunction, then system reliability is improved, but the reaction period delay causes safety risks from unauthorized engine starts
Solution Approach 1:
The engine false start prevention part is configured to detect unauthorized engine starts and prevent fuel feed/ignition before the monitoring part can intervene. This preliminary detection and prevention mechanism operates independently and simultaneously with the monitoring part, eliminating the safety gap caused by the reaction period delay.
2Adaptability or versatility
If fuel feed and ignition are enabled above minimum rotational velocity, then towed start and push-start operations are enabled, but unauthorized starts can occur due to overshooting minimum rotational velocity
Solution Approach 1:
The engine false start prevention part continuously monitors engine rotational velocity and start demand status, providing feedback control. When an unauthorized start is detected (rotation above minimum velocity without proper start demand), the system immediately disables fuel feed and ignition, preventing harmful emissions while maintaining legitimate start capabilities.
Solution Approach 2:
The system applies preliminary anti-action by preparing to disable fuel feed and ignition before unauthorized combustion can occur. The engine false start prevention part is pre-configured to immediately cut off fuel supply and ignition when unauthorized rotation is detected, preventing the harmful effect of unauthorized starts.
3Reliability
If the electric machine control part is monitored for malfunctions, then system safety is improved, but the finite reaction period allows brief unauthorized torque production to occur
Solution Approach 1:
The engine false start prevention part acts as an intermediary safety mechanism between the electric machine control part and the engine fuel/ignition systems. It provides an additional layer of protection by independently detecting unauthorized engine rotation and immediately preventing fuel feed and ignition, regardless of the monitoring part's reaction time.
Data Source
AI summary
A control device for controlling the operation of an internal combustion engine and of an electrical machine in a hybrid drive assembly, which permits a mechanical coupling of the engine and the machine in a drive train. An engine control part controls the internal combustion engine and an electrical machine control part controls the electrical machine. A monitoring part monitors proper operation of the control parts and, in the event of a malfunction, takes over a control function within a reaction time span. An engine false-start prevention part detects a transition of the internal combustion engine from stopped to running and, in the event of such a transition, checks if a proper start of the internal combustion engine was requested within a predefined past time span in order to prevent a fuel supply release and/or an ignition release if such a start was not requested.