CN113495393A - Intelligent glass's closed-loop control system - Google Patents
Intelligent glass's closed-loop control system Download PDFInfo
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- CN113495393A CN113495393A CN202010199458.XA CN202010199458A CN113495393A CN 113495393 A CN113495393 A CN 113495393A CN 202010199458 A CN202010199458 A CN 202010199458A CN 113495393 A CN113495393 A CN 113495393A
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- Prior art keywords
- glass
- closed
- dimming
- control system
- light transmittance
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/15—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on an electrochromic effect
- G02F1/163—Operation of electrochromic cells, e.g. electrodeposition cells; Circuit arrangements therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60J—WINDOWS, WINDSCREENS, NON-FIXED ROOFS, DOORS, OR SIMILAR DEVICES FOR VEHICLES; REMOVABLE EXTERNAL PROTECTIVE COVERINGS SPECIALLY ADAPTED FOR VEHICLES
- B60J3/00—Antiglare equipment associated with windows or windscreens; Sun visors for vehicles
- B60J3/04—Antiglare equipment associated with windows or windscreens; Sun visors for vehicles adjustable in transparency
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
Abstract
The invention discloses a closed-loop control system of intelligent glass, which comprises the intelligent glass and a dimming controller, wherein the dimming controller is used for correspondingly outputting a dimming signal for driving the intelligent glass according to target light transmittance input by a user, and the system also comprises: and the light transmittance detection device is configured to directly detect the actual light transmittance of the smart glass and feed back the detected actual light transmittance to the dimming controller, wherein the dimming controller is configured to adjust the dimming signal output by the dimming controller based on the actual light transmittance fed back by the light transmittance detection device.
Description
Technical Field
The invention relates to the field of intelligent glass, in particular to a closed-loop control system of intelligent glass.
Background
The intelligent light-adjusting glass is an electric light-adjusting glass, and can control the state of functional materials in a polyester film or an interlayer by using voltage so as to achieve the purpose of adjusting the light transmittance of the glass, and the light transmittance of the electric light-adjusting glass can be controlled by changing an input electric signal.
One common smart light modulating glass is made by adding an electro-actuatable color modulating film, such as an SPD film, an LC or PDLC film, etc., to the smart glass structure. In order for the smart glass to exhibit a desired light transmittance, the smart glass control device may apply a target control voltage to the light adjusting film based on a sunshine condition around the vehicle or a request of a user.
However, in practical applications, the optical characteristics (transmittance VS control voltage curve) and the electrical characteristics (equivalent circuit) of the light adjusting film are usually affected by the temperature change of the external environment, so that the transmittance of the actual output of the smart glass deviates from the expected value.
The current intelligent glass control scheme cannot dynamically adapt to the change of a load (namely, the intelligent glass/dimming film), cannot accurately acquire the actual light transmittance of the intelligent glass, and can only carry out rough estimation by indirectly measuring the load state (namely, the working voltage and the working current of the intelligent glass). The estimated result usually has a large deviation from the actual value, and cannot provide effective feedback for the control device, so that the dimming effect of the intelligent glass is inaccurate.
Disclosure of Invention
In order to solve the above problems in the prior art, the present invention provides an intelligent glass closed-loop control system including a transmittance detection device, wherein the transmittance detection device can directly detect the actual transmittance of the intelligent glass and feed back the actual transmittance to a dimming controller, and the dimming controller can adjust the PWM control signal output by the dimming controller in real time based on the desired transmittance input by the user and the actual transmittance fed back by the transmittance detection device, so as to minimize the dimming error. The closed-loop control system can dynamically adapt to the electrical characteristics and the optical characteristics of the dimming glass so as to realize accurate dimming control on the intelligent glass.
Specifically, the present invention provides a closed-loop control system for smart glass, the system comprising the smart glass and a dimming controller for outputting a dimming signal for driving the smart glass according to a target transmittance input by a user, wherein the system further comprises: and the light transmittance detection device is configured to directly detect the actual light transmittance of the smart glass and feed back the detected actual light transmittance to the dimming controller, wherein the dimming controller is configured to adjust the dimming signal output by the dimming controller based on the actual light transmittance fed back by the light transmittance detection device.
According to an alternative embodiment, the light transmittance detection device comprises: a light source disposed on a first surface of the smart glass and configured to emit a predetermined luminous flux to the smart glass based on a control instruction of an arithmetic control unit of the light transmittance detection apparatus; a light sensitive sensor disposed on a second surface of the smart glass in a position aligned with the light source and configured to detect a luminous flux emitted from the light source through the smart glass; and an arithmetic control unit configured to calculate an actual light transmittance of the smart glass from the luminous flux emitted by the light source and the luminous flux detected by the photosensor.
According to an alternative embodiment, the smart glass is a window pane, and the light source and the light-sensitive sensor are arranged in a bottom edge region of the window pane, which bottom edge region is concealed by the window frame.
According to an alternative embodiment, the arithmetic control unit is integrated in a window control.
According to an alternative embodiment, the smart glass is a vehicle roof glass, and the light source and the light-sensitive sensor are arranged at an edge region of the vehicle roof glass, which edge region is concealed by a vehicle roof structure.
According to an alternative embodiment, the arithmetic control unit is integrated in a sunroof controller of a vehicle.
According to an alternative embodiment, the arithmetic control unit is provided independently of the dimmer control and is configured to provide the calculated actual light transmittance to the dimmer control via a vehicle bus.
According to an alternative embodiment, the arithmetic control unit is integrated in the dimmer control.
According to an optional embodiment, the dimming controller further comprises an output signal monitoring module, which is used for monitoring whether the dimming signal output from the dimming controller to the smart glass is abnormal or not, and sending an alarm if the dimming signal is abnormal.
Drawings
Other features and advantages of the system of the present invention will be apparent from, or are more particularly, described in the drawings incorporated herein, and in the detailed description which follows, together with the drawings, serve to explain certain principles of the invention. In the drawings:
FIG. 1 shows a block diagram of a closed loop control system for smart glass according to an exemplary embodiment of the present invention;
FIG. 2 is a block diagram illustrating a light transmittance detection apparatus in the closed-loop control system shown in FIG. 1;
FIG. 3 shows a schematic view of the application of the closed loop control system according to the present invention in a window pane;
FIG. 4 shows a schematic view of the application of the closed loop control system according to the invention in a roof glazing; and
fig. 5 shows a flowchart of a closed-loop control method for smart glass according to an exemplary embodiment of the present invention.
Detailed Description
The closed-loop control system for smart glass according to the present invention will be described by way of example with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention to those skilled in the art. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. Rather, it is contemplated that the invention may be practiced with any combination of the following features and elements, whether or not they relate to different embodiments. Thus, the following aspects, features, embodiments and advantages are merely illustrative and should not be considered elements or limitations of the claims except where explicitly recited in a claim(s).
It is known to add to a smart glass structure an electro-actuatable color modulating film, such as an SPD film, which can be switched between a dark/turbid state and a transparent state, the relative alignment between suspended particles inside the SPD being determined by the dimming voltage applied to the SPD film by the dimming controller, which in turn determines the light transmittance of the smart glass. Depending on the sunshine conditions around the vehicle or a user request, the dimming controller may apply a target control voltage to the smart glass, particularly a dimming film thereof, to cause the smart glass to exhibit a desired light transmittance.
Fig. 1 shows a block diagram of a closed-loop control system for smart glass according to an exemplary embodiment of the present invention. As shown in fig. 1, the dimming controller may specifically include a signal processing and control module, and a signal conversion module.
The signal processing and control module can output a corresponding control signal based on the target light transmittance of the smart glass provided by the user, wherein the control signal is a PWM signal.
The signal conversion module is used for converting direct current provided by the direct current power supply into alternating current for driving the intelligent glass under the control of the signal processing and control module. In summary, the signal conversion module comprises a supply input connected to the power supply and a control input connected to the signal processing and control module and is configured to pulse-width modulate the supply voltage provided by the power supply based on the PWM signal output from the signal processing and control module to convert it into a dimming signal that drives the smart glass.
Specifically, the signal conversion module may include a DC/DC converter and a DC/AC converter, the DC/DC converter may perform a boosting operation on a DC supply voltage thereof based on the SPI control command output by the signal processing and control module, the boosted DC supply voltage is further provided to the DC/AC converter, and the DC/AC converter may pulse-width modulate the DC supply voltage based on the PWM control signal provided by the signal processing and control module to convert the DC supply voltage into an alternating current signal having a desired frequency and amplitude, which is a dimming signal for driving the smart glass.
In addition, due to problems such as short circuit of an external output line of the dimming controller, grounding or connection failure of an external load, an abnormality may occur in the dimming signal output from the dimming controller for driving the smart glass. In order to detect the abnormal output condition in the dimming signal, the dimming controller further optionally comprises an output signal monitoring module for monitoring whether the dimming signal output from the dimming controller to the smart glass is abnormal or not, and sending an alarm to the signal processing and control module in the dimming controller if the abnormal dimming signal is abnormal.
It is understood that in practical applications, the optical characteristics (transmittance VS control voltage curve) and the electrical characteristics (equivalent circuit) of the light adjusting film in the smart glass are generally affected by the temperature change of the external environment, so that the transmittance of the actual output of the smart glass deviates from the expected value.
To this end, the smart glass closed-loop control system according to the exemplary embodiment of the present invention further includes a transmittance detection device for detecting an actual transmittance of the smart glass and feeding back the detected actual transmittance to the dimming controller.
After receiving the feedback signal that luminousness detection device provided, dimming controller can adjust its dimming signal of output in real time based on the actual luminousness by intelligent glass to make the error minimizing between intelligent glass's actual luminousness and the target luminousness of user's input, thereby realize the accurate dimming control to intelligent glass.
Fig. 2 is a detailed structural view showing the light transmittance detecting apparatus shown in fig. 1. As shown in fig. 2, the light transmittance detection apparatus includes a light source disposed on an upper surface of the smart glass, a photosensor disposed on a lower surface of the smart glass, and an arithmetic control unit.
The light source may emit a predetermined luminous flux a to the smart glass based on a control instruction of the arithmetic control unit, and the light source is preferably positioned so that it emits light perpendicularly toward the dimming film of the smart glass to ensure that substantially all the luminous flux a reaches the dimming film.
The photosensor is disposed on the lower surface at a position aligned with the light source to receive and detect the light flux b emitted from the light source and transmitted through the smart glass.
The arithmetic control unit may calculate the actual light transmittance T of the smart glass as a/b from the light flux a emitted by the light source and the light flux b detected by the photosensor.
It can be understood that the operation control unit in the light transmittance detection apparatus of the smart glass according to the present invention can be integrated in the dimming controller of the smart glass to transmit the calculated actual light transmittance to the dimming controller in real time.
As an alternative embodiment, the arithmetic control unit in the light transmittance detection device may be provided independently of the dimming controller of the smart glass, in which case the arithmetic control unit may provide the calculated actual light transmittance to the dimming controller via vehicle bus technology (e.g. CAN bus or LIN bus).
Fig. 3 shows a schematic view of the use of the closed-loop control system according to the invention in a vehicle window pane. As shown in fig. 3, in the application of the window glass, the light source and the photosensor in the light transmittance detection device of the smart glass are disposed in the bottom edge area of the window glass, which is shielded from being exposed to natural light by the door frame. The light transmittance of the area is consistent with that of other exposed parts of the intelligent glass, but the window frame body range is not exposed, so that the integral mechanical structure of a vehicle door and a vehicle window is not influenced, and the appearance of the window frame body part is not influenced.
In this application, the arithmetic control unit in the light transmittance detection device of the smart glass may be integrated in the window controller.
Fig. 4 shows a schematic view of the application of the closed-loop control system according to the invention in a roof glazing. As shown in fig. 4, in the application of the sunroof glass, the light source and the photosensor in the light transmittance detection device may be disposed at an edge area of the sunroof glass of the vehicle, which is preferably shielded from being exposed to natural light by a roof structure of the vehicle. The light transmission of this region is consistent with that of the other exposed portions of the skylight glass, but does not affect the overall visual appearance of the skylight.
In this application, the operation control unit in the light transmittance detection device of the smart glass can be integrated in the skylight controller.
Fig. 5 shows a flowchart of a closed-loop control method for smart glass according to an exemplary embodiment of the present invention. As shown in fig. 5, at the beginning of a program for executing the method, the dimming controller receives a target transmittance input by a user and an actual transmittance detected by the transmittance detection means, and adjusts its output control signal in real time based on the difference therebetween. Then, the dimming controller further modulates a dimming signal for driving the smart glass based on the control signal. An output signal monitoring module in the dimming controller can monitor whether the dimming signal output to the intelligent glass from the dimming controller is abnormal or not in real time and send an alarm under the abnormal condition.
The intelligent glass closed-loop control system comprises a light transmittance detection device, wherein the light transmittance detection device can directly detect the actual light transmittance of the intelligent glass and feed the actual light transmittance back to the dimming controller, and the dimming controller can adjust the PWM control signal output by the dimming controller in real time based on the expected light transmittance input by a user and the actual light transmittance fed back by the light transmittance detection device, so that the dimming error is minimized. The closed-loop control system can dynamically adapt to the electrical characteristics and the optical characteristics of the dimming glass so as to realize accurate dimming control on the intelligent glass.
Although the present invention has been described with reference to the preferred embodiments, it is not to be limited thereto. Various changes and modifications can be made without departing from the spirit and scope of the invention, and the scope of the invention should be determined by the appended claims.
Claims (9)
1. A closed-loop control system of intelligent glass, which comprises the intelligent glass and a dimming controller, wherein the dimming controller is used for correspondingly outputting a dimming signal for driving the intelligent glass according to a target light transmittance input by a user, and the system is characterized by further comprising:
a light transmittance detection device configured to directly detect an actual light transmittance of the smart glass and feed back the detected actual light transmittance to the dimming controller,
wherein the dimming controller is configured to adjust the dimming signal output therefrom based on the actual transmittance fed back by the transmittance detection means.
2. The closed-loop control system of claim 1, wherein the transmittance detection means comprises:
a light source disposed on a first surface of the smart glass and configured to emit a predetermined luminous flux to the smart glass based on a control instruction of an arithmetic control unit of the light transmittance detection apparatus;
a light sensitive sensor disposed on a second surface of the smart glass in a position aligned with the light source and configured to detect a luminous flux emitted from the light source through the smart glass; and
an arithmetic control unit configured to calculate an actual light transmittance of the smart glass from the luminous flux emitted by the light source and the luminous flux detected by the photosensor.
3. Closed-loop control system according to claim 2,
the intelligent glass is the window glass, and the light source and the photosensitive sensor are arranged in the bottom edge area of the window glass, and the bottom edge area is shielded by the window frame body.
4. Closed-loop control system according to claim 3,
the arithmetic control unit is integrated in the vehicle window controller.
5. Closed-loop control system according to claim 2,
the intelligent glass is vehicle skylight glass, the light source and the photosensitive sensor are arranged in the edge area of the vehicle skylight glass, and the edge area is shielded by a vehicle roof structure.
6. Closed-loop control system according to claim 5,
the arithmetic control unit is integrated in the vehicle sunroof controller.
7. Closed-loop control system according to claim 2,
the arithmetic control unit is provided independently of the dimming controller, and is configured to provide the calculated actual transmittance to the dimming controller via a vehicle bus.
8. Closed-loop control system according to claim 2,
the arithmetic control unit is integrated in the dimming controller.
9. Closed-loop control system according to any one of claims 2 to 8,
the dimming controller further comprises an output signal monitoring module which is used for monitoring whether the dimming signal output to the intelligent glass from the dimming controller is abnormal or not and sending an alarm under the abnormal condition.
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| CN202010199458.XA CN113495393A (en) | 2020-03-20 | 2020-03-20 | Intelligent glass's closed-loop control system |
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| CN202010199458.XA CN113495393A (en) | 2020-03-20 | 2020-03-20 | Intelligent glass's closed-loop control system |
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