CN113660753B - Digital dimming control method for tunnel entrance and exit - Google Patents
Digital dimming control method for tunnel entrance and exit Download PDFInfo
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Abstract
The invention discloses a digital dimming control method for tunnel entrance and exit, which comprises the steps of firstly setting parameters; calibrating dimming parameters, and determining the brightness of the head and tail of each section of the tunnel according to the set calibration brightness and the parameters determined in the step 1; then determining the dimming ratio extremum of each section of the tunnel entrance; and finally, carrying out real-time dimming on the tunnel, and determining different dimming given values of each lamp in the tunnel in real time by a dimming controller according to the detection value of the brightness sensor, and sending corresponding dimming given values to each lamp dimming module at regular time or in real time to realize digital continuous dimming of the entrance section. The invention adjusts the existing step type illumination brightness control to the multi-fold line type illumination brightness control, the brightness of the lamp is reduced after dimming, so that the transition of the tunnel illumination brightness or dark bright environment is more natural and softer, the driving safety is facilitated, the entrance and exit illumination energy consumption is reduced to a certain extent, and the tunnel energy-saving operation is realized while the tunnel entrance and exit illumination environment is improved.
Description
Technical Field
The invention relates to a tunnel illumination control and implementation method, in particular to a digital dimming control method for tunnel entrance and exit.
Background
The current urban tunnel/highway tunnel entrance-exit reinforced transitional illumination is designed by referring to highway tunnel illumination design rules and LED urban road illumination application technical requirements, and the transitional illumination design comprehensively considers the requirement of setting the sectional brightness of the tunnel entrance-exit illumination (comprising an entrance section, a transitional section, a middle section and an exit section) according to the external brightness, traffic flow, driving speed and viewing distance. The device is arranged according to the design requirement of the sectional transition illumination control, the energy consumption of the reinforced transition illumination of the inlet and the outlet is high, the comfort level of traffic driving is poor, and the traffic driving safety is not facilitated. Especially in the tunnel that traffic flow is big, and design speed per hour is high, and the outside brightness is high, set up longer import changeover portion according to standard requirement, the higher occasion illumination energy consumption problem of import and export brightness requirement is especially outstanding.
At present, part of units have proposed to eliminate the tunnel entrance black hole phenomenon by adopting a human eye dark adaptation characteristic curve control method. The characteristic curve control method provided by the algorithm from the view of dark adaptation of human eyes relates to power function calculation, is difficult to combine with engineering design and construction practice, only provides entrance bright-dark transition control, does not provide exit dark-bright transition control, requires that a lamp has a dimming function and a system needs to be provided with more brightness sensors, and has higher manufacturing cost.
Disclosure of Invention
In order to solve the problems, the invention provides a digital dimming control method for a tunnel entrance and an exit, which specifically comprises the following steps:
step 1, setting parameters;
step 2, calibrating dimming parameters, and determining the brightness of the head and the tail of each section of the tunnel according to the set calibration brightness and the parameters determined in the step 1;
step 3, determining a dimming proportion extremum of each section of the tunnel entrance;
and 4, real-time dimming of the tunnel, wherein the dimming controller determines different dimming given values of each lamp in the tunnel in real time according to the detection value of the brightness sensor, and sends corresponding dimming given values to each lamp dimming module at regular time or in real time so as to realize digital continuous dimming of the entrance section.
A digital dimming control system for tunnel entrance and exit comprises the following modules:
parameter setting module: the method comprises the steps of setting parameters in a tunnel, including brightness coefficients of each section and the number of dimming lamps of each section;
and the dimming parameter calibration module is used for: the method comprises the steps of determining the brightness of the end and the head of each section in a tunnel according to the calibrated brightness and parameters in the tunnel;
dimming proportion determining module: the dimming ratio extreme value of each section of the tunnel entrance is determined;
and the tunnel real-time dimming module is used for: the device is used for realizing digital continuous dimming of the entrance section.
Compared with the prior art, the invention has the beneficial effects that:
(1) The control method provided by the invention is a multi-fold line control transition method, each section is connected by fold lines, the illumination brightness is adjusted in advance linearly and gradually in a descending manner in the illumination section, continuous illumination between the sections is realized, the brightness violation and sense are reduced, the illumination comfort is improved, and the driving safety is facilitated.
(2) The control method provided by the invention reduces the average brightness in the segment by gradually decreasing the brightness in the segment in advance, thereby realizing illumination energy saving.
(3) The invention adopts the latest digital dimming control method to realize continuous gradual decrease dimming in each lighting entrance/exit transition section, and the dimming given percentage value between adjacent lamps in each transition section is equal decrease (entrance transition)/increase (exit transition), thereby realizing digital continuous dimming transition.
The invention is further described below with reference to the drawings and detailed description.
Drawings
Fig. 1 is a flow chart of digital dimming control of the entrance section in the present invention.
Fig. 2 is a flow chart of digital dimming control at the exit section of the present invention.
Fig. 3 is a lamp control wiring diagram of the inlet section in the present invention.
Fig. 4 is a lamp control wiring diagram of the outlet section of the present invention.
FIG. 5 is a graph showing the comparison between the standard brightness requirement of the line and the brightness control requirement of the present invention.
Fig. 6 is a graph showing the front-rear comparison of the average brightness of the illumination of the entrance section 1 in the present invention.
FIG. 7 is a plan view of an entrance section luminance sensor and a lamp according to an embodiment of the invention.
FIG. 8 is a plan view of an exit section luminance sensor and a lamp according to an embodiment of the invention.
Detailed Description
The digital dimming control method for the entrance and the exit of the tunnel specifically comprises the following steps:
step 1, setting parameters, specifically:
according toSetting brightness coefficient a of each section in tunnel according to highway tunnel lighting design rules or LED urban road lighting application technical requirements 1 -a n And setting the quantity of dimming lamps at each section in the tunnel according to the layout plan of the designed lamps.
Step 2, calibrating dimming parameters, and determining the brightness of the head and the tail of each section of the tunnel according to the set calibration brightness and the parameters determined in the step 1, wherein the method specifically comprises the following steps:
step 2-1: setting the nominal brightness outside the tunnel as L_w0, and setting the nominal brightness of the basic section of the tunnel as L_b0;
step 2-2: the head brightness of the tunnel entrance section is L_t0 n ＝L_w0×a n+1 Segment end brightness is L_t1 n ＝L_w0×a n Wherein, one end of each section close to the tunnel portal is a section end, and one end far away from the portal is a section head;
step 2-3: the first brightness of the first segment of the tunnel outlet segment is the nominal brightness L_b0 of the basic segment of the tunnel, and the first brightness of the rest outlet segments of the tunnel is L_t0 n ＝L_b0×a n-1 Segment end brightness is L_t1 n ＝L_b0×a n Wherein, the one end that every section is close to the tunnel portal is the section end, and the one end that keeps away from the portal is the section head.
Step 3, determining a dimming proportion extremum of each section of the tunnel entrance and exit, which specifically comprises the following steps:
step 3-1: the brightness detector is utilized, and the dimming proportion value A of each section of illumination lamp is uniformly given through the digital dimming control system controller n So that the brightness detection value of each segment brightness detector reaches the segment end brightness requirement determined in the step 2, and at the moment, each segment dimming proportion value A n Storing the dimming proportion Kmax of each section as 0n%;
step 3-2: the brightness detector is utilized, and the dimming proportion value B of each section of illumination lamp is uniformly given through the digital dimming control system controller n So that the brightness detection value of each segment brightness detector reaches the segment head brightness requirement determined in the step 2, and each segment is given a dimming proportion value B n The first dimming proportion Kmin of each section is stored as 0n percent.
Step 4, real-time dimming of the tunnel, wherein the dimming controller determines different dimming given values of each lamp in the tunnel in real time according to the detection value of the brightness sensor, and sends corresponding dimming given values to each lamp dimming module at regular time or in real time to realize digital continuous dimming of the entrance section, and the method specifically comprises the following steps:
step 4-1: the real-time dimming control of tunnel entrance section specifically is:
step 4-1-1: the entrance section dimming controller collects the outdoor brightness L_w1 in real time, and determines the ratio beta of the outdoor brightness L_w1 to the calibrated brightness L_w0, wherein beta=L_w1/L_w0;
step 4-1-2: and determining a dimming given value fn (N) corresponding to each lamp in the segment by beta and the segment specified given value, namely the lamp address N:
fn(N)＝β×[(A n -B n )×(N-1)/(n n -1)+B n ]
the lamp address addressing in each section takes the nearest tunnel portal as a high address N and the farthest tunnel portal as an initial address 1 when the lamp is dimmed;
step 4-1-3: and after the entrance section dimming controller determines fn (N), the value is transmitted to the lamp dimming module of the lamp address N through the digital dimming bus to perform real-time dimming.
After calculating fn (N), the controller sends the value to the lamp dimming module of the lamp address N through the digital dimming bus for real-time dimming. Because the dimming given value of the lamps 1-N in the section is a series of continuous conversion given values, continuous equidistant brightness change between adjacent lamps is realized:
fn(N)-fn(N-1)＝β*(A n -B n )*/(n n -1)
from the above, it can be seen that the digital continuity is more natural and softer as the number of lamps in the segment increases.
Step 4-2: the real-time dimming control of tunnel exit section specifically is:
step 4-2-1: the outlet section dimming controller collects the basic section brightness L_b1 in real time, and determines the ratio alpha of the basic section brightness L_b1 to the calibration brightness L_b0, wherein alpha=L_b1/L_b0;
step 4-2-2: and determining a dimming given value fn (N) corresponding to each lamp in the section by alpha and the specified given value of the section, namely the lamp address N:
fn(N)＝α×[(A n -B n )×(N-1)/(n n -1)+B n ]
the lamp addresses in each section are addressed by taking a near tunnel portal as a high address N and a far tunnel portal as an initial address 1 when the lamps are dimmed;
step 4-2-3: after determining fn (N), the outlet dimming controller sends the value to a lamp dimming module of a lamp address N through a digital dimming bus to perform real-time dimming;
after calculating fn (N), the controller sends the value to the lamp dimming module of the lamp address N through the digital dimming bus for real-time dimming. Because the dimming given value of the lamps 1-N in the section is a series of continuous conversion given values, continuous equidistant brightness change between adjacent lamps is realized:
fn(N)-fn(N-1)＝β*(A n -B n )*/(n n -1)
from the above, it can be seen that the digital continuity is more natural and softer as the number of lamps in the segment increases.
Further, the real-time dimming control of the tunnel entrance section and the real-time dimming control of the tunnel exit section further comprise a dimming sampling timer, and whether to re-collect the extra-tunnel brightness L_w1 or the basic section brightness L_b1 is judged according to the set time.
A digital dimming control system for tunnel entrance and exit comprises the following modules:
parameter setting module: the method comprises the steps of setting parameters in a tunnel, including brightness coefficients of each section and the number of dimming lamps of each section;
and the dimming parameter calibration module is used for: the method comprises the steps of determining the brightness of the end and the head of each section in a tunnel according to the calibrated brightness and parameters in the tunnel;
dimming proportion determining module: the dimming ratio extreme value of each section of the tunnel entrance is determined;
and the tunnel real-time dimming module is used for: the device is used for realizing digital continuous dimming of the entrance section.
The invention is further illustrated by the following examples.
Examples
As shown in fig. 1 and 2, a digital dimming control method for a tunnel entrance and exit specifically includes the following steps:
step 1, setting parameters, specifically:
setting the brightness coefficient a of each section in the tunnel according to the highway tunnel lighting design rule or the LED urban road lighting application technical requirement 1 -a n And setting the quantity of dimming lamps at each section in the tunnel according to the layout plan of the designed lamps.
The table of the parameter settings of the gateway in this embodiment is shown in table 1:
table 1: passageway parameter setting table
| Sequence number | Entrance and exit segmentation | Luminance coefficient a | Number n of reinforced lighting lamps |
| 1 | Inlet section 1 | a 1 | n 1 |
| 2 | Inlet section 2 | a 2 | n 2 |
| 3 | Transition section 1 | a 3 | n 3 |
| 4 | Transition section 2 | a 4 | n 4 |
| 5 | Transition section 3 | a 5 | n 5 |
| 6 | Outlet section 1 | a 6 | n 6 |
| 7 | Outlet section 2 | a 7 | n 7 |
Step 2, calibrating dimming parameters, and determining the brightness of the head and the tail of each section of the tunnel according to the set calibration brightness and the parameters determined in the step 1, wherein the method specifically comprises the following steps:
step 2-1: setting the nominal brightness outside the tunnel as L_w0, and setting the nominal brightness of the basic section of the tunnel as L_b0;
step 2-2: the head brightness of the tunnel entrance section is L_t0 n ＝L_w0×a n+1 Segment end brightness is L_t1 n ＝L_w0×a n Wherein, one end of each section close to the tunnel portal is a section end, and one end far away from the portal is a section head;
step 2-3: the brightness of the first segment of the tunnel outlet segment is the calibrated brightness L/u of the basic tunnel segmentb0, the head brightness of the rest outlet sections of the tunnel is L_t0 n ＝L_b0×a n-1 Segment end brightness is L_t1 n ＝L_b0×a n Wherein, the one end that every section is close to the tunnel portal is the section end, and the one end that keeps away from the portal is the section head.
The calculation table of the brightness requirements of the first segment and the last segment of each segment of the inlet and the outlet in this embodiment is shown in tables 2-3:
table 2: brightness requirement calculation table for head and tail of each section of inlet
Table 3: brightness requirement calculation table for head and tail of outlet section
As shown in Table 2, the head brightness of each segment of the entrance segment is the end brightness L_t0 of the next segment n ＝L_w0*a n+1 (i.e., L_t0) 1 ＝L_t1 2 ，L_t0 2 ＝L_t1 3 ，L_t0 3 ＝L_t1 4 ，L_t0 5 ＝L_b0。)。
From the exit luminance to the inverse incremental process, so computationally opposite to the entry, the exit segment 1 has a first luminance value L_t0 as shown in Table 3 6 =l_b0, exit segment 1 end luminance l_t1 6 ＝L_b0*a 6 First luminance value L_t0 of outlet segment 2 7 ＝L_b0 6 End brightness L_t1 of outlet segment 7 ＝L_b0*a 7 。
Step 3, determining a dimming proportion extremum of each section of the tunnel entrance and exit, which specifically comprises the following steps:
step 3-1: the brightness detector is utilized, and the dimming proportion value A of each section of illumination lamp is uniformly given through the digital dimming control system controller n So thatThe brightness detection value of each segment brightness detector reaches the segment end brightness requirement determined in the step 2, and at the moment, each segment dimming proportion value A n Storing the dimming proportion Kmax of each section as 0n%;
step 3-2: the brightness detector is utilized, and the dimming proportion value B of each section of illumination lamp is uniformly given through the digital dimming control system controller n So that the brightness detection value of each segment brightness detector reaches the segment head brightness requirement determined in the step 2, and each segment is given a dimming proportion value B n The first dimming proportion Kmin of each section is stored as 0n percent.
Through the dimming proportion Kmax0 of each section end after calibration n % is shown in table 4:
table 4: each section of standard dimming proportion storage table of passageway
Step 4, combining the brightness sensor of the tunnel entrance section and the lamp plane layout diagram of fig. 7 and 8, real-time dimming of the tunnel, wherein the dimming controller determines different dimming given values of each lamp in the tunnel in real time according to the detection value of the brightness sensor, and sends corresponding dimming given values to each lamp dimming module in time or in real time, so that digital continuous dimming of the entrance section is realized, specifically:
step 4-1: the real-time dimming control of tunnel entrance section specifically is:
step 4-1-1: the entrance section dimming controller collects the outdoor brightness L_w1 in real time, and determines the ratio beta of the outdoor brightness L_w1 to the calibrated brightness L_w0, wherein beta=L_w1/L_w0;
step 4-1-2: and determining a dimming given value fn (N) corresponding to each lamp in the segment by beta and the segment specified given value, namely the lamp address N:
fn(N)＝β×[(A n -B n )×(N-1)/(n n -1)+B n ]
the lamp address addressing in each section takes the nearest tunnel portal as a high address N and the farthest tunnel portal as an initial address 1 when the lamp is dimmed;
step 4-1-3: and after the entrance section dimming controller determines fn (N), the value is transmitted to the lamp dimming module of the lamp address N through the digital dimming bus to perform real-time dimming.
After calculating fn (N), the controller sends the value to the lamp dimming module of the lamp address N through the digital dimming bus for real-time dimming. Because the dimming given value of the lamps 1-N in the section is a series of continuous conversion given values, continuous equidistant brightness change between adjacent lamps is realized:
fn(N)-fn(N-1)＝β*(A n -B n )*/(n n -1)
from the above, it can be seen that the digital continuity is more natural and softer as the number of lamps in the segment increases.
Step 4-2: the real-time dimming control of tunnel exit section specifically is:
step 4-2-1: the outlet section dimming controller collects the basic section brightness L_b1 in real time, and determines the ratio alpha of the basic section brightness L_b1 to the calibration brightness L_b0, wherein alpha=L_b1/L_b0;
step 4-2-2: and determining a dimming given value fn (N) corresponding to each lamp in the section by alpha and the specified given value of the section, namely the lamp address N:
fn(N)＝β×[(A n -B n )×(N-1)/(n n -1)+B n ]
the lamp addresses in each section are addressed by taking a near tunnel portal as a high address N and a far tunnel portal as an initial address 1 when the lamps are dimmed;
step 4-2-3: after determining fn (N), the outlet dimming controller sends the value to a lamp dimming module of a lamp address N through a digital dimming bus to perform real-time dimming;
after calculating fn (N), the controller sends the value to the lamp dimming module of the lamp address N through the digital dimming bus for real-time dimming. Because the dimming given value of the lamps 1-N in the section is a series of continuous conversion given values, continuous equidistant brightness change between adjacent lamps is realized:
fn(N)-fn(N-1)＝β*(A n -B n )*/(n n -1)
from the above, it can be seen that the digital continuity is more natural and softer as the number of lamps in the segment increases.
In this embodiment, the wiring diagrams of the entrance and exit lamps are shown in fig. 3 and 4.
Further, the real-time dimming control of the tunnel entrance section and the real-time dimming control of the tunnel exit section further comprise a dimming sampling timer, and whether to re-collect the extra-tunnel brightness L_w1 or the basic section brightness L_b1 is judged according to the set time.
The comparison of fig. 5 shows that the brightness of each transition section is in step transition according to the current design standard brightness requirement, when a driver drives a vehicle from one transition section to another transition section, the transition of light and dark (entrance) or dark and bright (exit) is in violation and feel, the driving comfort is poor, and the driving safety is not facilitated. The control method is a multi-fold line control transition method, namely, as shown by fold lines in fig. 1, each segment is connected by fold lines, illumination brightness dimming is linearly and gradually decreased in advance in the illumination segment, continuous illumination between segments is realized, light and shade violations and feelings are reduced, illumination comfort is improved, and driving safety is facilitated.
According to the formula: luminous flux = luminous efficacy × power (Φ = η × P), the luminous efficacy of the luminaire remains substantially unchanged for a period of time after the luminaire is selected, the higher the luminous flux the higher the luminance in the tunnel.
As shown in fig. 6, taking one of the illumination segments (entrance 1 segment) analysis as an example, the illumination control method reduces the average brightness in the segment due to the progressive brightness decrease in the segment in advance, thereby realizing illumination energy saving.
After the digital continuous dimming control is performed by adopting the control method of the invention, the average brightness of the inlet section 1 is reduced from the original L-th1 to L-th1'; the required luminous flux for maintaining the original brightness L-th1 is phi=f (L-th 1), and the brightness phi '=f (L-th 1') after the new control method is utilized; by combining the above formulas, the energy-saving electric quantity DeltaW= (phi-phi')/eta (time) of the illumination of the inlet section 1 before and after the new control method is adopted can be known.
Claims (7)
1. The digital dimming control method for the entrance and the exit of the tunnel is characterized by comprising the following steps of:
step 1, setting parameters;
step 2, calibrating dimming parameters, and determining the brightness of the head and the tail of each section of the tunnel according to the set calibration brightness and the parameters determined in the step 1;
step 3, determining a dimming proportion extremum of each section of the tunnel entrance;
step 4, real-time dimming of the tunnel, wherein the dimming controller determines different dimming given values of each lamp in the tunnel in real time according to the detection value of the brightness sensor, and sends corresponding dimming given values to each lamp dimming module at regular time or in real time to realize digital continuous dimming of the entrance section, and the method specifically comprises the following steps:
step 4-1: real-time dimming control of tunnel entrance section:
step 4-1-1: the entrance section dimming controller collects the outdoor brightness L_w1 in real time, and determines the ratio beta of the outdoor brightness L_w1 to the calibrated brightness L_w0, wherein beta=L_w1/L_w0;
step 4-1-2: and determining a dimming given value fn (N) corresponding to each lamp in the segment by beta and the segment specified given value, namely the lamp address N:
fn(N)＝β×[(A n -B n )×(N-1)/(n n -1)+B n ]
the lamp address addressing in each section takes the nearest tunnel portal as a high address N and the farthest tunnel portal as an initial address 1 when the lamp is dimmed;
wherein A is n B represents the dimming proportion value of the end lighting lamp of each section of the tunnel n The dimming proportion value of the first lighting lamp of each section of the tunnel is represented;
step 4-1-3: after determining fn (N), the entrance section dimming controller sends the value to a lamp dimming module of a lamp address N through a digital dimming bus to dim in real time;
step 4-2: and the tunnel outlet section is subjected to real-time dimming control.
2. The method for controlling digital dimming of a tunnel entrance and exit according to claim 1, wherein the setting parameters in step 1 are specifically:
setting brightness coefficient a of each section in tunnel 1 To a n And setting the quantity of dimming lamps at each section in the tunnel.
3. The digital dimming control method for the tunnel entrance and exit according to claim 1, wherein the calibrated dimming parameters in the step 2 are specifically:
step 2-1: setting the nominal brightness outside the tunnel as L_w0, and setting the nominal brightness of the basic section of the tunnel as L_b0;
step 2-2: the brightness of the tunnel entrance section and the section head of the transition section is L_t0 n ＝L_w0×a n+1 Segment end brightness is L_t1 n ＝L_w0×a n ；
Step 2-3: the first brightness of the first segment of the tunnel outlet segment is the nominal brightness L_b0 of the basic segment of the tunnel, and the first brightness of the rest outlet segments of the tunnel is L_t0 n ＝L_b0×a n-1 Segment end brightness is L_t1 n ＝L_b0×a n 。
4. The digital dimming control method for the entrance and the exit of the tunnel according to claim 1, wherein the brightness detector in the step 3 determines a dimming ratio extremum of each section of the entrance and the exit of the tunnel, specifically:
step 3-1, uniformly setting dimming proportion value A of each section of lighting lamp by a digital dimming control system controller n So that the brightness detection value of each segment brightness detector reaches the segment end brightness requirement determined in the step 2, and at the moment, each segment dimming proportion value A n Storing the dimming proportion Kmax of each section as 0n%;
step 3-2: the dimming proportion value B of each section of lighting lamp is uniformly given through a digital dimming control system controller n So that the brightness detection value of each segment brightness detector reaches the segment head brightness requirement determined in the step 2, and each segment is given a dimming proportion value B n The first dimming proportion Kmin of each section is stored as 0n percent.
5. The method for controlling digital dimming of tunnel exits and entrances according to claim 1, wherein the real-time dimming of the tunnel exit section in step 4-2 comprises the following steps:
step 4-2-1: the outlet section dimming controller collects the basic section brightness L_b1 in real time, and determines the ratio alpha of the basic section brightness L_b1 to the calibration brightness L_b0, wherein alpha=L_b1/L_b0;
step 4-2-2: and determining a dimming given value fn (N) corresponding to each lamp in the section by alpha and the specified given value of the section, namely the lamp address N:
fn(N)＝α×[(A n -B n )×(N-1)/(n n -1)+B n ]
the lamp addresses in each section are addressed by taking a near tunnel portal as a high address N and a far tunnel portal as an initial address 1 when the lamps are dimmed;
step 4-2-3: and after the outlet dimming controller determines fn (N), the value is transmitted to the lamp dimming module of the lamp address N through the digital dimming bus to perform real-time dimming.
6. The method for controlling digital dimming of a tunnel entrance and exit according to claim 1 or 5, wherein the real-time dimming control of the tunnel entrance section and the real-time dimming control of the tunnel exit section further comprise a dimming sampling timer, and determining whether to re-collect the extra-tunnel luminance l_w1 or the basic section luminance l_b1 according to a set time.
7. The digital dimming control system for the tunnel entrance and exit is characterized by comprising the following modules:
parameter setting module: the method comprises the steps of setting parameters in a tunnel, including brightness coefficients of each section and the number of dimming lamps of each section;
and the dimming parameter calibration module is used for: the method comprises the steps of determining the brightness of the end and the head of each section in a tunnel according to the calibrated brightness and parameters in the tunnel;
dimming proportion determining module: the dimming ratio extreme value of each section of the tunnel entrance is determined;
and the tunnel real-time dimming module is used for: the method is used for realizing digital continuous dimming of the entrance section, and comprises the following specific processes:
the dimming controller determines different dimming given values of each lamp in the tunnel in real time according to the detection value of the brightness sensor, and sends corresponding dimming given values to each lamp dimming module at regular time or in real time so as to realize digital continuous dimming of the entrance section:
real-time dimming control of tunnel entrance section:
the entrance section dimming controller collects the outdoor brightness L_w1 in real time, and determines the ratio beta of the outdoor brightness L_w1 to the calibrated brightness L_w0, wherein beta=L_w1/L_w0;
and determining a dimming given value fn (N) corresponding to each lamp in the segment by beta and the segment specified given value, namely the lamp address N:
fn(N)＝β×[(A n -B n )×(N-1)/(n n -1)+B n ]
the lamp address addressing in each section takes the nearest tunnel portal as a high address N and the farthest tunnel portal as an initial address 1 when the lamp is dimmed;
wherein A is n B represents the dimming proportion value of the end lighting lamp of each section of the tunnel n The dimming proportion value of the first lighting lamp of each section of the tunnel is represented;
after determining fn (N), the entrance section dimming controller sends the value to a lamp dimming module of a lamp address N through a digital dimming bus to dim in real time;
and the tunnel outlet section is subjected to real-time dimming control.
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