Vehicle Starter Current Limitation Control
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Solution Overview
Problem
Existing starter systems for vehicles face challenges in reliably starting the engine under unfavorable conditions such as low temperatures and low supply voltages, as they often require permanent current limitation which can delay or prevent engine starting.
Innovation Solution
A method and device that dynamically measure physical variables like temperature and voltage to decide on starter current limitation, allowing the starter to operate with full supply voltage during unfavorable conditions by switching a limiter into bypass mode after a predetermined time, ensuring maximum starting torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If starter current is permanently limited during starting process, then voltage drop is reduced and electrical consumers are protected, but engine starting reliability deteriorates under unfavorable conditions (low temperature and low supply voltage)
Solution Approach 1:
The patent implements dynamic current limitation by switching between two operational modes: initially limiting starter current to protect the electrical system from voltage drops, then automatically switching to unlimited current mode after detection of successful engine starting. This dynamic adaptation resolves the contradiction by providing current limitation only when necessary, rather than permanently restricting current which would harm starting reliability under unfavorable conditions.
Solution Approach 2:
The system changes the current limitation parameter based on detected operating conditions. By monitoring parameters such as rotational speed, voltage, and current characteristics, the system determines when engine starting is successful and adjusts the current limitation parameter accordingly - maintaining limitation during critical starting phase, then removing limitation when starting is confirmed, thus protecting the electrical system while ensuring reliable engine starting.
2Object-affected harmful factors
If starter current is not limited during starting process, then engine starting reliability is improved, but voltage drop increases causing electrical consumers to switch off
Solution Approach 1:
The patent implements dynamic current limitation by switching between two operational modes: initially limiting starter current to protect the electrical system from voltage drops, then automatically switching to unlimited current mode after detection of successful engine starting. This dynamic adaptation resolves the contradiction by providing current limitation only when necessary, rather than permanently restricting current which would harm starting reliability under unfavorable conditions.
Solution Approach 2:
The system changes the current limitation parameter based on detected operating conditions. By monitoring parameters such as rotational speed, voltage, and current characteristics, the system determines when engine starting is successful and adjusts the current limitation parameter accordingly - maintaining limitation during critical starting phase, then removing limitation when starting is confirmed, thus protecting the electrical system while ensuring reliable engine starting.
3Power
If starter operates with full supply voltage continuously, then maximum starting torque is available, but electrical system experiences excessive current load and voltage drops
Solution Approach 1:
The patent implements dynamic current limitation by switching between two operational modes: initially limiting starter current to protect the electrical system from voltage drops, then automatically switching to unlimited current mode after detection of successful engine starting. This dynamic adaptation resolves the contradiction by providing current limitation only when necessary, rather than permanently restricting current which would harm starting reliability under unfavorable conditions.
Solution Approach 2:
The system employs periodic monitoring of operating parameters (rotational speed, voltage, current) during the starting process to detect engine starting success. Based on this periodic detection, the current limitation is dynamically adjusted - maintaining limitation during the critical starting phase when voltage drops are harmful, then removing limitation after successful starting is confirmed, thus providing maximum torque only when needed without causing excessive continuous current load.
Data Source
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AI summary
The invention relates to a method for operating a starter (203) of a vehicle, according to which a physical quantity is measured, characterized in that, depending on the measured physical quantity, a starter current of the starter (203) is limited or not limited, wherein, in the event that the starter current is limited, the limitation is ended after a predetermined time. The invention further relates to a device (201) for operating a starter of a vehicle and to a control program.