Vehicle Door Wake-Up Sensing for Low Idle Current
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Solution Overview
Problem
Existing methods for operating motor vehicle doors consume excessive idle current in the rest mode due to energized sensors and control units, which is inefficient among numerous electrical consumers in a vehicle.
Innovation Solution
A method where the sensor, deenergized in the rest mode, generates a current pulse upon door movement to wake up the control unit and transition it into the operating mode, utilizing an inductively operating acceleration sensor or induction unit to induce electrical current, activating the power supply unit and enabling the control unit to enter the operating mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sensor and control unit are kept energized to ensure immediate responsiveness, then the system reliability is improved, but the idle current consumption increases
Solution Approach 1:
The system alternates between active and sleep modes. The sensor operates periodically, switching between energized states for detection and deenergized states for power saving. This periodic operation allows the system to maintain functionality while reducing average power consumption.
Solution Approach 2:
The sensor is designed to generate its own current pulse through electromagnetic induction when subjected to door movement. This self-generated signal automatically wakes up the control unit without requiring continuous external power supply, enabling the system to serve itself and eliminate idle current consumption during rest periods.
2Use of energy by moving object
If the sensor generates a current pulse through door movement, then the power consumption is reduced, but the sensor must be deenergized in rest mode which may delay detection
Solution Approach 1:
The sensor utilizes the mechanical movement of the door itself as the triggering mechanism. When the door moves, it generates electromagnetic induction in the sensor, creating a current pulse. This converts the mechanical energy of door movement directly into an electrical signal, eliminating the need for continuous sensor power supply while maintaining detection capability.
Solution Approach 2:
The system replaces the traditional electronically-triggered sensor with a mechanically-triggered electromagnetic induction sensor. Instead of using electronic signals to activate the sensor, the physical movement of the door directly induces current through electromagnetic principles, substituting mechanical action for electronic control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Significantly reduces idle current consumption by keeping the control unit, sensor, and power supply deenergized in the rest mode, with the sensor's current pulse activating the power supply unit to transition the control unit into the operating mode only when door movement occurs, thereby minimizing power consumption.
Implementation Method 1
the sensor, deenergized in the rest mode, generates a current pulse upon door movement... utilizing an inductively operating acceleration sensor or induction unit to induce electrical current
Data Source
AI summary
A method for operating a motor vehicle door, according to which method the motor vehicle door is equipped, for example, with an actuator and/or a motor vehicle door lock in the form of a current consumer, and at least one sensor for detecting door movements. In addition, a control unit that evaluates signals from the sensor is provided which can be transferred from a rest mode into an operating mode and back again according to the recorded door movements. According to the invention, the door movement causes the sensor that is deenergised in the rest mode to generate a current pulse.