Vehicle Lamp Control Using Segmented Switch and MCU Driving
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Solution Overview
Problem
Current lamp control methods for vehicles either result in delayed notification of braking to following vehicles due to slower turn-on times in MCU control methods or reduced bulb lifespan and diagnostic limitations in switch direct driving methods.
Innovation Solution
A combined control apparatus and method that integrates switch direct driving and MCU control methods, where the lamp is initially turned on quickly using switch direct driving and then maintained and diagnosed using MCU control, minimizing turn-on time and extending bulb lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If switch direct driving method is used, then turn-on time is minimized (about 5 ms), but diagnostic capability is lost and bulb lifespan is shortened
Solution Approach 1:
The control process is divided into two segments: initial rapid turn-on using switch direct driving method, followed by transition to MCU control for diagnostics and maintenance. This segmentation allows each method to perform its optimal function without compromise.
Solution Approach 2:
The switch direct driving method performs the preliminary action of rapidly turning on the lamp before the MCU completes its judgment logic. This preliminary action ensures minimum turn-on time while allowing the MCU to subsequently take over for diagnostic functions.
2Reliability
If MCU control method is used, then diagnostic capability is enabled, but turn-on time increases (about 40 ms)
Solution Approach 1:
The switch direct driving method performs the preliminary action of rapidly turning on the lamp before the MCU completes its judgment logic. This preliminary action ensures minimum turn-on time while allowing the MCU to subsequently take over for diagnostic functions.
Solution Approach 2:
The IPS device acts as an intermediary between the switch and the lamp, enabling it to be controlled by either the switch directly or the MCU. This intermediary component facilitates the hybrid control approach by allowing seamless transition between direct driving and MCU-controlled modes.
3Speed
If switch direct driving method is used, then turn-on speed is fast (5 ms), but bulb lifespan is reduced
Solution Approach 1:
The control process is divided into two segments: initial rapid turn-on using switch direct driving method, followed by transition to MCU control for diagnostics and maintenance. This segmentation allows each method to perform its optimal function without compromise.
Solution Approach 2:
The system uses periodic PWM control after initial turn-on to regulate bulb operation. This periodic action reduces overall stress on the bulb compared to continuous full-power operation, thereby extending lifespan while maintaining rapid response capability.
4Manufacturing precision
If MCU control method is used, then lamp control precision is improved, but response time increases
Solution Approach 1:
The control process is divided into two segments: initial rapid turn-on using switch direct driving method, followed by transition to MCU control for diagnostics and maintenance. This segmentation allows each method to perform its optimal function without compromise.
Solution Approach 2:
The switch direct driving method performs the preliminary action of rapidly turning on the lamp before the MCU completes its judgment logic. This preliminary action ensures minimum turn-on time while allowing the MCU to subsequently take over for diagnostic functions.
Data Source
AI summary
A combined control apparatus includes a switch, an IPS device, a switch monitoring line, a lamp on/off monitoring line, and a switching device. The switch turns on or off a lamp. The IPS device associated with the lamp is connected to an output of the switch. The switch monitoring line is connected between the output of the switch and an input of an MCU to transmit a switch on/off state to the MCU. The lamp on/off monitoring line is connected between the input of the MCU and the IPS device to transmit a power switching signal of IPS to the MCU. The switching device is mounted in a signal transmission line connected between the output of the MCU and the IPS device to be turned on by a control signal of the MCU at a certain time after the lamp has initially been turned on by the switch.