CN108053660B - Control method for reducing emission of carbon dioxide in automobile exhaust facing traffic flow - Google Patents
Control method for reducing emission of carbon dioxide in automobile exhaust facing traffic flow Download PDFInfo
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Abstract
The invention discloses a control method for reducing the emission of carbon dioxide in automobile exhaust facing traffic flow. The method has the basic idea that aiming at urban roads, the waiting time of the intersection is reduced by optimizing the running speed and running state of the vehicle at the signal lamp intersection, the vehicle is kept to run at a constant speed or run at an accelerated speed to pass through the signal lamp intersection, the vehicle traffic capacity of the signal lamp intersection is improved, and the emission of carbon dioxide in the tail gas of the vehicle is reduced. In order to achieve the purpose, the control method for reducing the emission of carbon dioxide in the tail gas of the automobile facing the traffic flow, which is provided by the invention, comprises the following steps: carrying out data acquisition on relevant parameters of urban roads and intersections; carrying out traffic organization design; and judging whether the vehicle running speed meets the set conditions or not, and selecting a corresponding flow.
Description
Technical Field
The invention relates to a traffic flow-oriented control method for reducing the emission of carbon dioxide in automobile exhaust, which is used for reducing the emission of carbon dioxide in urban vehicle exhaust and belongs to the fields of traffic control and traffic emission reduction.
Background
Carbon dioxide is one of the main factors causing global warming and rising sea level. Carbon dioxide in automobile exhaust is one of the major contributors to global carbon dioxide. With the sudden increase of automobile holding capacity in recent years, the total amount of carbon dioxide in the exhaust gas of the vehicle is increasing. Therefore, reducing carbon dioxide emissions in vehicle exhaust is one of the important means to slow down the speed of climate phenomena such as global warming.
At present, according to a researched formula for discharging carbon dioxide from automobile exhaust, the discharge of carbon dioxide from the exhaust is related to the driving mileage, the driving time, the acceleration and deceleration state, the fuel oil and the like. In the case where the destination is clear and the vehicle is stationary, the carbon dioxide emission amount can be reduced by changing the acceleration-deceleration state.
By controlling the traffic flow and the driving speed, the waiting time of the vehicle intersection is reduced, the relevant parameters in the emission formula are changed, and the total emission of regional carbon dioxide is changed by controlling the emission of carbon dioxide in road traffic, so that the aims of energy conservation, emission reduction and smooth vehicle running are fulfilled finally.
Disclosure of Invention
The invention aims to solve the technical problem of providing a control method for reducing the emission of carbon dioxide in automobile exhaust for traffic flow, aiming at urban roads, the method reduces the waiting time of intersections by optimizing the running speed and running state of vehicles at signal lamp intersections, keeps the vehicles running at a constant speed or accelerates to pass through the signal lamp intersections, improves the vehicle traffic capacity of the signal lamp intersections and reduces the emission of carbon dioxide in the automobile exhaust.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a control method for reducing the emission of carbon dioxide in automobile exhaust facing traffic flow is characterized in that: the method comprises the following steps:
s1: carry out data acquisition to urban road and intersection relevant parameter, include:
the distance d from the previous intersection in four directions of the intersection, the number of lanes n of the road, the straight running width R of the intersection, the left-turn path distance dl, the right-turn path distance dr, the traffic flow f of each lane, the average speed v of the vehicle, the speed v of the vehicleiA minimum safe distance ds;
s2: carrying out traffic organization design, designing maximum allowable speed and initializing a traffic signal lamp period, wherein the traffic organization design comprises the following steps:
s21: dividing road grades according to actual road conditions, and setting maximum allowable speed of bidirectional lane
S22: setting the initialized fixed phase period (G)r+Gg+Gy) Wherein Gr, Gg and Gy respectively represent the phases of red light, green light and yellow light;
dynamically changing the traffic light period according to the data acquired in S1:
s23: setting the length L of a vehicle emission reduction model area and the length L of a buffer area according to the determined traffic data; obtaining the length L of the vehicle emission reduction region d-L according to the road length data d measured in S1;
s3: judging whether the vehicle running speed meets the set conditions or not, and selecting a corresponding process, wherein the process comprises the following steps:
s31: setting the initialization maximum speed according to S1 and S2
Wherein the content of the first and second substances,
vehicle and method for making same
Driving on a lane; s32: calculating the maximum running speed:
when the vehicles on the road a and the road B intersecting it are both running at the initial speed, the background center calculates the maximum running speed at the next second period,
assume that the maximum operating speed for the first cycle of road A is
The maximum operating speed in the second period of the road B is
When all vehicles in the road emission reduction area A reach the intersection and pass through the intersection in the first period, the first vehicle in the buffer area just reaches the intersection of the emission reduction area; meanwhile, the first vehicle in the emission reduction area in the road B just reaches the intersection, and waits for the next period to obtain the following formula:
wherein L is the distance between the first vehicle of the road and the buffer area, r is the half width of the intersection,
x0the safe vehicle distance between the last vehicle in the area L and the first vehicle in the buffer area 1 is obtained;
according to the above formula, the maximum driving speed in the second period can be determined when
Or
The background will notify the vehicle to initialize maximum speed
Driving, otherwise not notifying, the vehicle at the default maximum driving speed in the present period
Driving;
s33: judging whether the running speed exceeds the set maximum allowable speed or not comprises the following steps:
calculating the maximum speed of the vehicle in the i-th period according to the initial speed and the signal lamp operation period in the step S31
And determining the maximum speed of the vehicle
Whether the maximum allowable speed of the set road is exceeded or not
When the set value is exceeded, the maximum driving speed is again increasedIs initialized to
If the set value is not exceeded, the vehicle will continue to travel at the maximum travel speed.
The control method for reducing the emission of carbon dioxide in automobile exhaust facing traffic flow is characterized by comprising the following steps: the safe vehicle distance x0The calculation formula of (2) is as follows:
where τ is the driver reaction time, vtAt the current running speed, a is the vehicle deceleration and b is the effective stopping distance.
The control method for reducing the emission of carbon dioxide in automobile exhaust facing traffic flow is characterized by comprising the following steps: the initialization periods of the red light phase Gr, the green light phase Gg and the yellow light phase Gy are respectively 25 s; gg is 30 s; gy 5 s.
4. A traffic flow oriented control method for reducing carbon dioxide emissions from automobile exhaust according to claim 1, wherein: the above-mentioned
Obtained by the following formula:
the control method for reducing the emission of carbon dioxide in automobile exhaust facing traffic flow is characterized by comprising the following steps: setting the maximum allowable speed as a three-level road maximum allowable speed value according to the road grade division
60Km/h, second level road
Is 80 Km/h.
The control method for reducing the emission of carbon dioxide in automobile exhaust facing traffic flow is characterized by comprising the following steps: the road buffer area length l is set to 20 m.
The invention has the beneficial effects that:
1. compared with the traditional fixed phase period method, the control method for reducing the emission of the carbon dioxide in the tail gas of the automobile facing the traffic flow reduces the waiting time of the automobile intersection and improves the road traffic capacity.
2. The control method for reducing the emission of the carbon dioxide in the tail gas of the automobile for the traffic flow shortens the running time and reduces the emission of the carbon dioxide in the tail gas.
Drawings
FIG. 1 is a flow chart illustrating the maximum driving speed determination of a control method for reducing carbon dioxide emission from automobile exhaust for traffic flow according to the present invention;
FIG. 2 is a schematic view of an intersection of a traffic flow oriented control method for reducing carbon dioxide emissions from automobile exhaust according to the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The core idea of the invention is to reduce waiting time of vehicle intersection by changing traffic flow state, thereby reducing carbon dioxide emission of vehicle tail gas. Taking a certain road as an example, when the invention is applied to reduce the emission of carbon dioxide in the tail gas of an automobile, the invention is further explained, and refer to fig. 2.
The method comprises the following specific steps:
s1: carry out data acquisition to urban road and intersection relevant parameter, include:
the distance d from the previous intersection in four directions of the intersection, the number of lanes n of the road, the straight running width R of the intersection, the left-turn path distance dl, the right-turn path distance dr, the traffic flow f of each lane, the average speed v of the vehicle, the speed v of the vehicleiA minimum safe distance ds;
s2: carrying out traffic organization design, designing maximum allowable speed and initializing a traffic signal lamp period, wherein the traffic organization design comprises the following steps:
s21: dividing road grades according to actual road conditions, and setting maximum allowable speed of bidirectional lane
According to the grade division of the highway, the maximum allowable speed is set to be 60Km/h of the maximum allowable speed value of the third-level highway, and the maximum allowable speed value of the second-level highway is set to be 80 Km/h.
S22: setting the initialized fixed phase period (G)r+Gg+Gy) Wherein Gr, Gg and Gy respectively represent the phases of red light, green light and yellow light; the initialization periods are Gr-25 s respectively; gg is 30 s; gy 5 s.
Dynamically changing the traffic light period according to the data acquired in S1:
S23: setting the length L of a vehicle emission reduction model area and the length L of a buffer area according to the determined traffic data; the road buffer area is set to be 20m, and the vehicle emission reduction area length L is obtained as d-L according to the road length data d measured in S1.
S3: judging whether the vehicle running speed meets the set conditions or not, and selecting a corresponding process, wherein the process comprises the following steps:
s31: setting the initialization maximum speed according to S1 and S2
Wherein the content of the first and second substances,
vehicle and method for making same
Driving on a lane;
s32: calculating the maximum running speed:
when the vehicles on the road a and the road B intersecting it are both running at the initial speed, the background center calculates the maximum running speed at the next second period,
assume that the maximum operating speed for the first cycle of road A is
The maximum operating speed in the second period of the road B is
When all vehicles in the road emission reduction area A reach the intersection and pass through the intersection in the first period, the first vehicle in the buffer area just reaches the intersection of the emission reduction area; meanwhile, the first vehicle in the emission reduction area in the road B just reaches the intersection and waits for the next period. The following formula is obtained:
wherein L is the distance between the first vehicle of the road and the buffer area, r is the half width of the intersection,
x0the safe vehicle distance between the last vehicle in the area L and the first vehicle in the buffer area L is obtained;
according to the above-mentioned formula,the maximum travel speed for the second period may be determined when
Or
The background will notify the vehicle to initialize maximum speed
Driving, otherwise not notifying, the vehicle at the default maximum driving speed in the present period
Driving; without loss of generality, the subsequent process is calculated and judged according to the formula and the figure 1 as above, and is initialized again after N operation cycles are reached;
s33: judging whether the running speed exceeds the set maximum allowable speed or not comprises the following steps:
calculating the maximum speed of the vehicle in the i-th period according to the initial speed and the signal lamp operation period in the step S31
And determining the maximum speed of the vehicle
Whether the maximum allowable speed of the set road is exceeded or not
When the set value is exceeded, the maximum travel speed is again initialized to
If the set value is not exceeded, the vehicle will continue to travel at the maximum travel speed.
Wherein the safe distance x0The calculation formula of (2) is as follows:
where τ is the driver reaction time, vtAt the current running speed, a is the vehicle deceleration and b is the effective stopping distance.
According to the data in the previous steps, the following formula of the carbon dioxide emission of the automobile exhaust is combined:
E＝Kc(0.3T+0.028D+0.056Aee)
wherein:
e is the carbon dioxide emission value (g),
Kcis the ratio of the emission coefficient of fuel oil to the emission coefficient of carbon dioxide,
d is the driving distance (m),
t is the running time of the vehicle,
vkthe velocity at the k-th second (m/s),
σkif v isk>vk-1，σ k1 is ═ 1; in other cases, σk＝0，
If the driving distance is fixed, K of the same vehiclecAnd the emission amount of carbon dioxide in the tail gas of the vehicle is always consistent, the emission amount of carbon dioxide in the tail gas of the vehicle is only related to the speed, the running time and sigma.
Thus, the above formula can be simplified as:
when f (k) and g (k) take the minimum value at the same time, F (k) takes the minimum value. For f (k), if vkFixed and when it takes the maximum value, f (k) takes the minimum value. When the vehicle is running at a constant speed or at a reduced speed, sigma k0, g (k) takes the minimum value. Thus, when the vehicle is at maximum speed at all times
When running at constant speed, f (k) and g (k) are taken simultaneouslyObtaining the minimum value, and F (k) obtaining the minimum optimized value.
According to the formula of the optimized automobile exhaust carbon dioxide calculation model:
therefore, under the ideal and safe condition of the road, when the vehicle reaches the intersection and runs through the signal lamp intersection in a constant speed or acceleration state within the allowed time, the waiting time of the vehicle intersection can be reduced, the vehicle passing capacity of the signal lamp intersection is improved, and the emission of carbon dioxide in the tail gas of the vehicle is reduced. Thus, in the present control method, only the maximum operating speed is reached during each phase cycle
Exceeding a set maximum allowable speed
Then, the background will inform the vehicle to initialize the maximum speed
Driving, otherwise not notifying, the vehicle at the default maximum driving speed in the present period
To ensure minimum carbon dioxide emissions.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. A control method for reducing the emission of carbon dioxide in automobile exhaust facing traffic flow is characterized in that: the method comprises the following steps:
s1: carry out data acquisition to urban road and intersection relevant parameter, include:
the distance d from the previous intersection in four directions of the intersection, the number of lanes n of the road, the straight running width R of the intersection, the left-turn path distance dl, the right-turn path distance dr, the traffic flow f of each lane, the average speed v of the vehicle, the speed v of the vehicleiA minimum safe distance ds;
s2: carrying out traffic organization design, designing maximum allowable speed and initializing a traffic signal lamp period, wherein the traffic organization design comprises the following steps:
s21: dividing road grades according to actual road conditions, and setting maximum allowable speed of bidirectional lane
S22: setting the initialized fixed phase period (G)r+Gg+Gy) Wherein Gr, Gg and Gy respectively represent the phases of red light, green light and yellow light;
dynamically changing the traffic light period according to the data acquired in S1:
s23: setting the length L of a vehicle emission reduction model area and the length L of a buffer area according to the determined traffic data; obtaining the length L of the vehicle emission reduction region d-L according to the road length data d measured in S1;
s3: judging whether the vehicle running speed meets the set conditions or not, and selecting a corresponding process, wherein the process comprises the following steps:
s31: setting the initialization maximum speed according to S1 and S2
Wherein the content of the first and second substances,
vehicle and method for making same
Driving on a lane; s32: calculating the maximum running speed:
when the vehicles on the road a and the road B intersecting it are both running at the initial speed, the background center calculates the maximum running speed at the next second period,
assume that the maximum operating speed for the first cycle of road A is
The maximum operating speed in the second period of the road B is
When all vehicles in the road emission reduction area A reach the intersection and pass through the intersection in the first period, the first vehicle in the buffer area just reaches the intersection of the emission reduction area; meanwhile, the first vehicle in the emission reduction area in the road B just reaches the intersection, and waits for the next period to obtain the following formula:
wherein L is the distance between the first vehicle of the road and the buffer area, r is the half width of the intersection,
x0the safe vehicle distance between the last vehicle in the area L and the first vehicle in the buffer area L is obtained;
according to the above formula, the maximum driving speed in the second period can be determined when
Or
The background will notify the vehicle to initialize maximum speed
Driving, otherwise not notifying, the vehicle at the default maximum driving speed in the present period
Driving;
s33: judging whether the running speed exceeds the set maximum allowable speed or not comprises the following steps:
calculating the maximum speed of the vehicle in the i-th period according to the initial speed and the signal lamp operation period in the step S31
And determining the maximum speed of the vehicle
Whether the maximum allowable speed of the set road is exceeded or not
When the set value is exceeded, the maximum travel speed is again initialized to
If the set value is not exceeded, the vehicle will continue to travel at the maximum travel speed.
2. A traffic flow oriented control method for reducing carbon dioxide emissions from automobile exhaust according to claim 1, wherein: the safe vehicle distance x0The calculation formula of (2) is as follows:
where τ is the driver reaction time, vtAt the current running speed, a is the vehicle deceleration and b is the effective stopping distance.
3. A traffic flow oriented control method for reducing carbon dioxide emissions from automobile exhaust according to claim 1, wherein: the initialization periods of the red light phase Gr, the green light phase Gg and the yellow light phase Gy are respectively 25 s; gg is 30 s; gy 5 s.
4. A traffic flow oriented control method for reducing carbon dioxide emissions from automobile exhaust according to claim 1, wherein: the above-mentioned
Obtained by the following formula:
5. a traffic flow oriented control method for reducing carbon dioxide emissions from automobile exhaust according to claim 1, wherein: setting the maximum allowable speed as a three-level road maximum allowable speed value according to the road grade division
60Km/h, second level road
Is 80 Km/h.
6. A traffic flow oriented control method for reducing carbon dioxide emissions from automobile exhaust according to claim 1, wherein: the road buffer area length l is set to 20 m.
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| CN114820259A (en) * | 2022-03-28 | 2022-07-29 | 武汉大学 | Real-time calculation method for road vehicle tail gas carbon dioxide emission based on space-time deep learning model |
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