Hybrid Control Unit Torque Release via Preliminary Notification
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Solution Overview
Problem
In motor vehicles with multiple drives, such as internal combustion engines and electric machines, the existing systems experience delays in implementing torque requirements due to the sequential request and release process between control units, including the immobilizer control unit, leading to inefficiencies in torque implementation.
Innovation Solution
The master control unit communicates the request signal directly to all drive control units, including the immobilizer control unit, allowing them to send a simultaneous request, thereby bypassing the need for sequential verification and enabling immediate release signals, thus reducing the time required for torque implementation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the master control device sends a request to the immobilizer control device and then sequentially requests each drive control device, then the immobilizer control device can verify each request, but the overall time to implement torque requirements increases significantly
Solution Approach 1:
The master control device sends a preliminary notification signal to all drive control devices when it requests a release signal from the immobilizer control device. This allows drive control devices to be prepared in advance, so that when the immobilizer releases, they can immediately send their request signals without waiting for sequential notifications, thereby reducing torque implementation time while maintaining verification reliability
Solution Approach 2:
The control process is segmented into two independent phases: (1) master control device communicates with immobilizer control device for verification, and (2) drive control devices independently send requests to immobilizer based on the preliminary notification. This segmentation allows parallel processing of verification and request preparation, eliminating sequential delays
2Reliability
If the master control device notifies each drive control device sequentially before they send requests to the immobilizer, then the immobilizer can properly verify each unit, but the complexity of the communication protocol increases
Solution Approach 1:
The communication protocol is segmented into two distinct message types: a preliminary notification signal from the master control device to drive control devices, and separate request signals from each drive control device to the immobilizer control device. This segmentation simplifies the protocol by making message purposes explicit and reducing the need for complex sequential coordination logic
Solution Approach 2:
The master control device acts as an intermediary that initiates the process by sending a notification signal to drive control devices when it needs a release signal from the immobilizer. This intermediary role coordinates the timing and sequencing of communications without requiring complex direct peer-to-peer protocols between all control units
Data Source
AI summary
In a motor vehicle having two different drives, in particular an internal combustion engine and an electric drive, there are two control units (ECU, PE) for the respective drives and a leading control unit (Hybrid), which preferably controls the internal combustion engine and assigns torque to the individual drives when there are torque requests. Corresponding request signals are sent and implemented only if the existence of a certain situation (key inserted, "terminal 15") is detected by an engine immobilizer control unit (EI master). In order for not too much time to pass due to the querying of the engine immobilizer control unit, the leading control unit informs the other control units that a query is sent so that the other control units can also send a query already.