Starter Relay Control via Segmented Automatic and Manual Paths
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Solution Overview
Problem
Existing starter motor control systems either limit operator control over engine cranking duration or result in unsatisfactory operator feedback by taking control away from the operator once engine startup is initiated, leading to issues like excessive fuel in cylinders and rough engine starts.
Innovation Solution
A starter control system with an independently controllable starter relay, including a high side and low side node, allows for automatic activation by a control module and manual override via an ignition switch, ensuring consistent and robust engine starts by managing power delivery to the starter motor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the starter relay high side is controlled automatically by a control module, then the engine start consistency is improved and premature shutdown is prevented, but the operator control over cranking duration is reduced
Solution Approach 1:
The control system is segmented into two independent control paths: an automatic control path through the control module that ensures reliable engine starting by preventing premature shutdown, and a manual control path through the ignition switch that preserves operator control. Both paths converge on the starter relay high side control, allowing them to work independently yet cooperatively without conflict.
2Ease of operation
If the operator control over starter motor duration is maintained, then the operator feedback is improved, but the crank duration is limited by key position and may cause excessive fuel in cylinders
Solution Approach 1:
The control module acts as an intermediary between the ignition switch and the starter relay. It receives the operator's start command through the ignition switch, processes it according to predefined logic that prevents excessive cranking and fuel accumulation, and then activates the starter relay. This intermediary role allows the system to respect operator intent while preventing harmful conditions.
3Ease of operation
If the starter relay is controlled solely by the ignition switch, then the operator control is maintained, but the system cannot prevent excessive fuel in cylinders from premature key release
Solution Approach 1:
The control module implements feedback control by continuously monitoring engine running conditions and the state of the ignition switch. When the engine is running or when cranking duration exceeds predefined thresholds, the control module disables the starter relay regardless of ignition switch position. This feedback mechanism prevents excessive fuel accumulation and harmful cranking conditions while preserving operator control through the ignition switch.
Data Source
AI summary
A starter control system is disclosed. In one example, the starter control system may be activated via predetermined control logic or via an operator action that is not subject to the predetermined control logic.