Exterior Rearview Mirror Assembly With Dual-Axis View Adjustment
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Solution Overview
Problem
Existing exterior rearview mirror assemblies for vehicles lack an efficient mechanism to adjust the rearward field of view of the driver, particularly in terms of lateral and vertical adjustments, while maintaining a compact and aerodynamic design.
Innovation Solution
The exterior rearview mirror assembly incorporates two actuators with non-coaxial pivot axes, allowing for cooperative pivoting of the mirror head relative to the vehicle side. This configuration enables independent lateral and vertical adjustments of the rearward field of view, with the actuators operating at different speeds to optimize adjustment precision and smoothness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single actuator is used to adjust the mirror, then the device complexity is reduced, but the adjustment precision and range of the rearward field of view are insufficient
Solution Approach 1:
The adjustment function is segmented into two independent actuators: a first actuator for lateral adjustment and a second actuator for vertical adjustment. Each actuator controls one degree of freedom, enabling precise independent control of mirror position in lateral and vertical directions, thereby resolving the contradiction between adjustment precision and device complexity.
2Measurement precision
If the actuators operate at the same rotational speed, then the control system is simplified, but the smoothness and precision of mirror adjustment are reduced
Solution Approach 1:
The control system is designed to dynamically adjust the rotational speeds of the two actuators independently. The first actuator and second actuator can operate at different rotational speeds according to the specific adjustment requirements, enabling smooth and precise mirror positioning while maintaining a relatively simple control architecture through speed-independent control channels.
3Adaptability or versatility
If the pivot axes are coaxial, then the mechanical structure is simplified, but the range of adjustment angles is limited
Solution Approach 1:
The mechanical structure transitions from a single-axis (coaxial) configuration to a two-axis non-coaxial configuration. The first pivot axis and second pivot axis are arranged non-coaxially, with the second pivot axis offset from the first, enabling the mirror to achieve both lateral and vertical adjustment angles simultaneously, thereby expanding the overall adjustment range without significantly complicating the mechanical structure.
Data Source
AI summary
A vehicular exterior rearview mirror system includes an exterior rearview mirror assembly configured for attachment at a vehicle. The mirror assembly includes a mirror head adjustable about a mounting base, which has a mounting end for mounting at the vehicle and a distal end that is distal from the mounting end. The distal end accommodates an actuator. The mirror head is movable relative to the mounting base and the exterior portion of the vehicle via electrical operation of the actuator to set a rearward view for a driver of the vehicle. With the mirror assembly mounted at the exterior portion of the vehicle, an attachment plate and the mirror reflective element move in tandem with movement of the mirror head relative to the exterior portion of the vehicle when the driver of the vehicle operates the actuator to adjust the rearward view for the driver of the vehicle.