CN113815609B - Constant-speed cruising system and fuel-saving control method and device thereof - Google Patents
Constant-speed cruising system and fuel-saving control method and device thereof Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
- B60W30/14—Adaptive cruise control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
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Abstract
The invention relates to a constant-speed cruising system and a fuel-saving control method and device thereof. The method comprises the following steps: acquiring a historical driving track of the vehicle in the previous whole driving process; finding out and storing a first acceleration point with the historical torque change rate exceeding the set torque change rate in the historical driving track; detecting current position information of a vehicle in a current driving process; increasing torque at a first torque change rate at a set distance from the current position to the first acceleration point, so that the torque/vehicle speed of the current vehicle when the current vehicle runs to the first acceleration point is equal to the historical torque/vehicle speed of the first acceleration point; the first torque change rate is lower than a historical torque change rate corresponding to the first acceleration point. The invention records the condition of the acceleration point in the previous whole-course running process, advances the acceleration point with lower torque change rate in the subsequent running process, grasps the running condition in real time and adjusts the acceleration point, thereby realizing the optimal oil saving effect.
Description
Technical Field
The invention relates to a constant-speed cruising system and a fuel-saving control method and device thereof, belonging to the technical field of vehicle energy control.
Background
In recent years, with the advancement of technology, a constant-speed cruise system has been developed in order to reduce the workload of a driver. Constant-speed cruising is to automatically maintain the vehicle speed without stepping on the accelerator pedal after a switch in a cruising state is closed according to the speed requested by the driver, and to drive the vehicle at a fixed speed.
In the existing constant-speed cruise system, after the constant-speed cruise state is started, the cruise system generally runs at a set speed, and the output power of the vehicle cannot be adjusted according to road conditions, so that certain fuel consumption is wasted. Therefore, a control method for cruise control according to road condition information is proposed, for example, a Chinese patent application document with the application publication number of CN 109910890A discloses a truck prediction energy-saving system and a control method based on road topography information.
However, the method calculates the control strategy by modeling, belongs to an idealized and fixed control strategy for a certain road topography, and in many practical cases, the control strategy cannot be adjusted according to the practical conditions of the road, and the fuel consumption is wasted to a certain extent.
Disclosure of Invention
The invention aims to provide a fuel-saving control method of a constant-speed cruise system, which is used for solving the problem of high fuel consumption caused by the existing constant-speed cruise control method; meanwhile, the oil-saving control device of the constant-speed cruising system is also provided, so that the problem of high oil consumption caused by the conventional constant-speed cruising control device is solved; and simultaneously, a constant-speed cruising system is provided, so that the problem of high oil consumption of the conventional constant-speed cruising system is solved.
In order to achieve the above purpose, the present application proposes a technical scheme of a fuel-saving control method of a constant-speed cruise system, including the following steps:
1) Acquiring a historical driving track of the vehicle in the previous whole driving process; the historical driving track comprises: historical position information of the vehicle, and historical torque and historical vehicle speed corresponding to each historical position;
2) Finding out and storing a first acceleration point with the historical torque change rate exceeding the set torque change rate in the historical driving track;
3) Detecting current position information of a vehicle in a current driving process; increasing torque at a first torque change rate at a set distance from the first acceleration point at the current position, so that the torque/vehicle speed of the current vehicle when the current vehicle runs to the first acceleration point is equal to the historical torque/vehicle speed of the first acceleration point; the first torque change rate is lower than the historical torque change rate of the first acceleration point.
In addition, the application also provides a technical scheme of the oil-saving control device of the constant-speed cruising system, which comprises a processor, a memory and a computer program which is stored in the memory and can run on the processor, wherein the processor realizes the technical scheme of the oil-saving control method of the constant-speed cruising system when executing the computer program.
In addition, the application also provides a technical scheme of the constant-speed cruising system, which comprises a GPS positioning module, an information acquisition module and an oil saving control device, wherein the oil saving control device comprises a processor, a memory and a computer program which is stored in the memory and can run on the processor, and the processor realizes the technical scheme of the oil saving control method of the constant-speed cruising system when executing the computer program.
The constant-speed cruising system and the oil-saving control method and device have the beneficial effects that: the fuel quantity is increased sharply due to the fact that the sudden rapid acceleration is caused by the overlarge torque change rate, and therefore the invention adjusts aiming at the acceleration point with the overlarge torque change rate. In the previous whole-course running process, an acceleration point with overlarge torque change rate in a historical running track is found, and slow acceleration is performed in advance aiming at the point with overlarge torque change rate, namely acceleration is started at a position where the acceleration point advances at a lower torque change rate until the speed/torque reaches the target speed/torque when reaching the first acceleration point, so that the fuel quantity of the first acceleration point is reduced. According to the situation of the acceleration points recorded in the historical driving track, the position of the acceleration points and the torque change rate are adjusted in the subsequent driving process, the driving situation is mastered in real time and adjusted, so that the optimal matching of the constant-speed cruise control and the road is realized, and the optimal oil saving effect is also realized.
Furthermore, in the constant-speed cruising system and the fuel-saving control method and the fuel-saving control device thereof, in order to ensure the comfort and the stability of constant-speed cruising, a deceleration point of a vehicle in a historical driving track and a second acceleration point of last acceleration before the deceleration point are also found and stored; during the current driving, the vehicle increases torque at a second acceleration point at a second torque change rate that is lower than the historical torque change rate of the second acceleration point.
Further, in the constant-speed cruising system, the fuel-saving control method and the fuel-saving control device thereof, in order to balance the fuel-saving rate and the time cost, after the first torque change rate is lower than the set torque change rate, the total fuel quantity and the running duration of each whole running are counted, the fuel-saving rate is obtained according to the total fuel quantity of two continuous whole running, and the time change rate is obtained according to the running duration of two continuous whole running; and adjusting the first torque change rate according to the fuel saving rate and the time change rate.
Furthermore, in the constant-speed cruising system, the fuel-saving control method and the fuel-saving control device thereof, in order to avoid excessive increase of driving duration caused by reduction of torque change rate, so that comprehensive cost is increased, the fuel-saving rate and the time change rate are weighted and overlapped to obtain the comprehensive cost change rate; adjusting the first torque change rate with the integrated cost change rate equal to 0 as a target; if the comprehensive cost change rate is far from the target, increasing a first torque change rate; if the integrated cost rate of change approaches the target, the first torque rate of change is reduced.
Further, in the constant-speed cruising system, the fuel-saving control method and the fuel-saving control device thereof, in order to balance the fuel-saving rate and the time cost, after the first torque change rate is lower than the set torque change rate and the deceleration point is eliminated, the total fuel quantity and the running duration of each whole-course running are counted, the fuel-saving rate is obtained according to the total fuel quantity of two continuous whole-course running, and the time change rate is obtained according to the running duration of two continuous whole-course running; and adjusting the first torque change rate and the second torque change rate according to the fuel saving rate and the time change rate.
Furthermore, in the constant-speed cruising system, the fuel-saving control method and the fuel-saving control device thereof, in order to avoid excessive increase of driving duration caused by reduction of torque change rate, so that comprehensive cost is increased, the fuel-saving rate and the time change rate are weighted and overlapped to obtain the comprehensive cost change rate; adjusting the first torque change rate and the second torque change rate with the integrated cost change rate equal to 0 as a target; if the comprehensive cost change rate is far away from the target, increasing a first torque change rate and a second torque change rate; if the integrated cost rate of change approaches the target, the first and second torque rates of change are reduced.
Furthermore, in the constant-speed cruising system, the oil saving control method and the oil saving control device thereof, the oil saving rate is the main factor in the comprehensive cost, so that the weight corresponding to the oil saving rate is larger than the weight corresponding to the time change rate.
In the constant-speed-cruise system, the fuel-saving control method and the fuel-saving control device, the set torque change rate is set according to the test, and the set torque change rate is 20%.
Drawings
FIG. 1 is a schematic diagram of the constant speed cruise system of the present invention;
FIG. 2 is a schematic diagram of the fuel saving control device of the constant speed cruising system of the present invention;
FIG. 3 is a flowchart of a fuel saving control method of the cruise control system in embodiment 1 of the present invention;
FIG. 4 is a flowchart of a fuel saving control method of the cruise control system in embodiment 2 of the present invention;
FIG. 5 is a flowchart of a fuel saving control method of the cruise control system in embodiment 3 of the present invention;
fig. 6 is a flowchart of a fuel saving control method of the cruise control system in embodiment 4 of the present invention.
Detailed Description
Embodiment 1
Constant speed cruise system embodiment:
the constant-speed cruising system provided by the embodiment comprises a GPS positioning module, an information acquisition module and an oil-saving control device shown in fig. 2 as shown in fig. 1. The GPS positioning module is used for collecting the position information of the vehicle, the information collecting module comprises a vehicle speed sensor and a torque sensor, the information collecting module is used for collecting the speed and the torque of the vehicle, the fuel-saving control device comprises a processor, a memory and a computer program which is stored in the memory and can run on the processor, and the computer program instructions realize the original self-control logic of the vehicle and the fuel-saving control method. The GPS positioning module and the information acquisition module send the acquired information to the oil saving control device through the CAN bus, and the oil saving control device outputs a control instruction after logic judgment so as to control the driving mechanism to output torque according to the control instruction.
During running of the vehicle, the relation between the torque and the vehicle speed is that the torque is increased, the vehicle speed is increased, and the torque change rate is high, namely the acceleration of the vehicle is high. The vehicle speed is not constant in the constant-speed cruising process, and acceleration or braking can occur in order to ensure that the vehicle speed is maintained in a range, but the oil consumption is easy to be overlarge in the acceleration process, so the invention provides the following technical scheme of the oil-saving control method to solve the problem of overlarge oil consumption.
The main conception of the fuel-saving control method provided by the embodiment is that on the basis of the original self control logic of the vehicle in a constant-speed cruising road section, an acceleration point with larger torque change rate is recorded, and the optimal control parameter when the fuel-saving rate of the constant-speed cruising road section is 0 is obtained by adjusting the control parameter; the control parameters include the position of the acceleration point and the rate of change of torque at the acceleration point.
The specific implementation process of the fuel-saving control method is shown in fig. 3, and comprises the following steps:
1) In the previous whole-course running process, firstly, constant-speed cruise control is carried out according to the original control logic of the vehicle, and in the whole process, the historical running track of the vehicle is obtained: the method comprises the steps of acquiring each historical position in the driving process through a GPS positioning module, acquiring the historical vehicle speed and the historical torque corresponding to each historical position through an information acquisition module, finding out a first acceleration point in the process and storing the first acceleration point.
In the historical driving track, the point of speed increase in the historical vehicle speed corresponding to each historical position is an acceleration point; meanwhile, the historical torque change rate of the acceleration point is obtained according to the change of the torque at the acceleration point; a first acceleration point at which the historical torque change rate Δtorq exceeds 20% (i.e., the set torque change rate) is found and stored.
In order to ensure the accuracy of the data at the first acceleration points, the vehicle is subjected to constant-speed cruise control for 2 times according to the original control logic of the vehicle, namely, the vehicle is driven for 2 times according to the track, and then the first acceleration points and the historical torque change rate of each first acceleration point are recorded. Of course, as other embodiments, the number of times of constant speed cruising is not limited, and may be 1 time or more.
The set torque change rate is 20% of the set value obtained from the driving experience, and of course, the set torque change rate may be adjusted as needed, and the present invention is not limited thereto.
2) When the vehicle runs again, the current constant-speed cruising running process is increased on the basis of the original control logic of the vehicle: detecting current position information of a vehicle, and increasing torque at a set distance of the current position from a first acceleration point at a first torque change rate to enable the torque/vehicle speed of the current vehicle to be equal to the historical torque/vehicle speed of the first acceleration point when the current vehicle runs to the first acceleration point; the first torque change rate is lower than the historical torque change rate of the first acceleration point (the first torque change rate is a term herein indicating the adjustment process of the first acceleration point, and thus the value of the first torque change rate is variable).
In the previous whole driving process, the first acceleration point can increase the oil consumption, so the first acceleration point is adjusted. The position of the acceleration point is advanced, and the torque change rate is reduced at the advanced position of the acceleration point, so that the vehicle speed can be ensured, and the fuel quantity can be reduced.
Specifically, the value of the first torque change rate is lower than the historical torque change rate of the first acceleration point by 10%, and as other embodiments, the invention does not limit the magnitude of the reduced historical torque change rate, and can gradually and slowly adjust the magnitude of the first torque change rate under the condition of ensuring comfort, and the magnitude of the first torque change rate can also be calculated according to the set distance and the target vehicle speed/torque to be achieved.
3) After step 2) is executed, the fuel quantity is required to be evaluated, so that after the value of the first torque change rate is lower than 20%, the value of the first torque change rate is reduced continuously, namely, the tiny (1% step) value of the first torque change rate is reduced, the total fuel quantity of each subsequent whole journey is counted, the fuel saving rate x% is obtained according to the total fuel quantity of two continuous whole journey, the fuel saving rate is equal to 0 (0 is not equal to 0 in absolute sense and is close to 0), the value of the first torque change rate is regulated, and if the fuel saving rate x% is close to the target 0, the value of the first torque change rate is reduced (forward regulation); if the fuel saving rate x% is far from the target 0, the value of the first torque change rate is increased (reverse adjustment) until the fuel saving rate is equal to 0, and the corresponding value of the first torque change rate is the optimal torque change rate.
The amount of fine adjustment at the time of evaluation may be a smaller value, and the present embodiment is not limited. Meanwhile, regarding the evaluation form, an evaluation form of comprehensive cost can also be adopted, and the embodiment is not limited.
The calculation process of the oil saving rate is as follows: the total fuel quantity is x when the vehicle runs in the whole course twice continuously 1 And x 2 Then x% = (x 1 -x 2 )/x 1 *100, the fuel saving control method of the present embodiment is described below by taking the point a corresponding to the first acceleration point as an example:
in the previous driving process, the historical torque change rate of the position point A corresponding to the first acceleration point is 25%, and exceeds the set torque change rate by 20%, so that when the vehicle is driven again, the torque is increased at the position point A at the position of the first 250m, the torque is increased by 15% at the first torque change rate (the value of the first torque change rate is reduced by 10% on the basis of the historical torque change rate of the first acceleration point), and meanwhile, the current torque/vehicle speed of the vehicle passing through the position point A again is ensured to reach the historical torque/vehicle speed;
the first torque change rate is 15% and meets the requirement of being lower than the set torque change rate by 20%, so that the fuel quantity is evaluated, the value of the first torque change rate is changed to 14% next time, the value of the first torque change rate is changed to 13% next time, the fuel quantity when the first torque change rate is 15% and the fuel quantity when the first torque change rate is 14% are compared, the first fuel rate is obtained, the fuel quantity when the first torque change rate is 14% and the fuel quantity when the first torque change rate is 13% are compared, the second fuel rate is obtained, if the change trend of the first fuel rate and the second fuel rate is close to the target 0, the value of the first torque change rate is continuously reduced, if the change trend of the first fuel rate and the second fuel rate is far away from the target 0, the value of the first torque change rate is required to be increased, the fuel rate is ensured, and the fuel rate is ensured until the corresponding first torque change rate is 0.
According to the embodiment, the first acceleration point with the overlarge torque change rate is adjusted, so that the oil saving effect is improved.
An embodiment of a fuel-saving control device of a constant-speed cruising system:
the fuel-saving control device of the constant-speed-cruise system provided by the embodiment, as shown in fig. 2, comprises a processor, a memory and a computer program stored in the memory and capable of running on the processor, wherein the processor realizes the fuel-saving control method of the constant-speed-cruise system when executing the computer program.
The specific implementation process and the effect of the fuel-saving control method of the constant-speed cruising system are described in the above-mentioned constant-speed cruising system embodiment, and are not described here.
That is, the method in the above embodiments of the cruise control system should be understood that the flow of the fuel saving control method of the cruise control system can be implemented by computer program instructions. These computer program instructions may be provided to a processor, such as a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus, etc., such that the instructions, which execute via the processor, create means for implementing the functions specified in the above-described method flows.
The processor in this embodiment refers to a microprocessor MCU or a processing device such as a programmable logic device FPGA;
the memory according to the present embodiment is used for storing computer program instructions formed by implementing the fuel-saving control method of the cruise control system, and includes a physical device for storing information, in which the information is usually stored in a medium using an electrical, magnetic or optical method after being digitized. For example: various memories, RAM, ROM and the like for storing information by utilizing an electric energy mode; various memories for storing information by utilizing a magnetic energy mode, such as a hard disk, a floppy disk, a magnetic tape, a magnetic core memory, a bubble memory and a U disk; various memories, CDs or DVDs, which store information optically. Of course, there are other ways of storing, such as quantum storing, graphene storing, etc.
The fuel-saving control device of the constant-speed-cruise system, which is formed by the memory storing the computer program instructions formed by the fuel-saving control method for realizing the constant-speed-cruise system and the processor, is realized by executing corresponding program instructions by the processor in the computer, and the computer can be realized by using a windows operating system, a linux system or other systems, for example, using android and iOS system programming languages in an intelligent terminal, and is realized by processing logic based on a quantum computer.
As other embodiments, the fuel saving control device of the cruise control system may further include other processing hardware, such as a database or a multi-level cache, a GPU, etc., and the present invention does not specifically limit the structure of the fuel saving control device of the cruise control system.
An embodiment of a fuel-saving control method of a constant-speed cruising system comprises the following steps:
the implementation process and effect of the fuel-saving control method of the cruise control system according to the present embodiment are described in the above-mentioned cruise control system embodiment, and are not described here again.
Embodiment 2
Constant speed cruise system embodiment:
the hardware structure and the connection relationship of the cruise control system according to the present embodiment are the same as those of the cruise control system in example 1, and will not be described here. The difference from the cruise control system in embodiment 1 is that the cruise control system in this embodiment considers a braking phenomenon in the cruise control process, makes the cruise control more stable and comfortable by eliminating the braking phenomenon, and evaluates the adjustment parameters by using the integrated cost rate in consideration of not only the phenomenon of excessive fuel consumption but also the influence of the driving time on the integrated cost.
Specifically, the specific implementation process of the fuel saving control method in this embodiment is shown in fig. 4, and includes the following steps:
1) In the previous whole-course running process, firstly, constant-speed cruise control is carried out according to the original control logic of the vehicle, and in the whole process, the historical running track of the vehicle is obtained: the method comprises the steps of acquiring each historical position in the driving process through a GPS positioning module, acquiring the historical vehicle speed and the historical torque corresponding to each historical position through an information acquisition module, finding out a first acceleration point and a second acceleration point in the process, and storing the first acceleration point and the second acceleration point.
In the historical driving track, the point of speed increase in the historical vehicle speed corresponding to each historical position is an acceleration point, and the point of speed reduction is a deceleration point (the deceleration point is a braking point, namely a point with more deceleration, and the acquisition of the deceleration point can also be obtained through a braking signal of the vehicle, so that the embodiment is not limited); meanwhile, according to the change of the torque at the acceleration points, the historical torque change rate of each acceleration point is obtained; finding a first acceleration point at which the historical torque change rate DeltaTorq exceeds 20% (i.e. the set torque change rate) and a second acceleration point at which the vehicle was recently accelerated before the deceleration point (the speed before braking is V 0 The stable speed after braking is V 1 The second acceleration point, i.e. reaching the speed V before braking 0 The point at which the last output torque increased) and stored.
In order to ensure the accuracy of the data at the acceleration points, the vehicle is subjected to constant-speed cruise control for 2 times according to the original control logic of the vehicle, namely, the first acceleration point, the second acceleration point and the deceleration point of the vehicle are recorded after the vehicle runs for 2 times according to the track, and the historical torque change rate of each acceleration point is recorded. Of course, as other embodiments, the number of times of constant speed cruising is not limited, and may be 1 time or more.
The set torque change rate is 20% of the set value obtained from the driving experience, and of course, the set torque change rate may be adjusted as needed, and the present invention is not limited thereto.
2) When the vehicle runs again, the current constant-speed cruising running process is increased on the basis of the original control logic of the vehicle: detecting current position information of a vehicle, and increasing torque at a set distance of the current position from a first acceleration point at a first torque change rate to enable the torque/vehicle speed of the current vehicle to be equal to the historical torque/vehicle speed of the first acceleration point when the current vehicle runs to the first acceleration point; the first torque change rate is lower than the historical torque change rate of the first acceleration point; the vehicle increases torque at the second acceleration point at a second torque change rate that is lower than the historical torque change rate at the second acceleration point (where the first torque change rate and the second torque change rate are terms indicating the adjustment process of the first acceleration point and the second acceleration point, and thus the values of the first torque change rate and the second torque change rate are variable).
The adjustment process of the first acceleration point is the same as that in embodiment 1, and will not be described in detail here. And adjusting the cause of the second acceleration point: the second acceleration point accelerates too much causing the existence of a deceleration point.
Specifically, the value of the first torque change rate is lower than the historical torque change rate of the first acceleration point by 10%, the value of the second torque change rate is lower than the historical torque change rate of the second acceleration point by 5%, and as other embodiments, the magnitude of the reduced historical torque change rate is not limited, the first torque change rate and the second torque change rate can be gradually and slowly adjusted under the condition of ensuring comfort, and the first torque change rate can be calculated according to the set distance and the target vehicle speed/torque to be achieved.
3) After the step 2) is executed, the comprehensive cost is required to be evaluated, after the first torque change rate is lower than 20% and the deceleration point is eliminated, the values of the first torque change rate and the second torque change rate are continuously reduced by a tiny (1% step), the total fuel quantity and the running duration of each subsequent whole-course running are counted, the fuel saving rate x% is obtained according to the total fuel quantity of the continuous two whole-course running, and the time change rate y% is obtained according to the running duration of the continuous two whole-course running; the fuel saving rate x% and the time change rate y% are weighted and overlapped to obtain the comprehensive cost change rate of 0.7x% +0.3y%; the first torque change rate and the second torque change rate are adjusted with the goal of the integrated cost change rate being equal to 0 (here, equal to 0 is not necessarily equal to 0 in an absolute sense, but is close to 0).
In order to make the comprehensive cost change rate approach to 0, the specific method for adjusting the current torque change rate of each acceleration point is as follows: judging whether the comprehensive cost change rate is close to the target 0, if so, indicating that the trend of reducing the torque change rate can reduce the comprehensive cost, and continuously reducing the values of the first torque change rate and the second torque change rate by 1% each time to perform forward regulation; if the target 0 is far away, the trend of the torque change rate is indicated to be reduced, the comprehensive cost is increased, the values of the first torque change rate and the second torque change rate are reversely adjusted by 1% step length until the comprehensive cost change rate is 0, and at the moment, the values of the first torque change rate and the second torque change rate are the optimal torque change rate. The amount of fine adjustment at the time of evaluation may be a smaller value, and the present embodiment is not limited.
The invention takes oil saving as the main part, and the weight corresponding to the oil saving rate is greater than the weight corresponding to the running time length.
In the above embodiment, the first torque change rate and the second torque change rate are adjusted simultaneously to adjust the integrated cost, and as other embodiments, only the first torque change rate or the second torque change rate may be adjusted, so long as the integrated cost change rate is close to 0.
In the above-described embodiment, the integrated cost rate is used for evaluation, and as other embodiments, the evaluation may be performed by the fuel saving rate as in embodiment 1, or the evaluation may be performed by the time change rate.
Assuming that the total fuel amount is x when the vehicle runs in the whole course twice in succession 1 And x 2 Then x% = (x 1 -x 2 )/x 1 *100%; assume that the driving duration is y when the whole course is driven twice consecutively 1 And y 2 Then y% = (y 1 -y 2 )/y 1 *100%. The following describes the fuel saving control method of the present embodiment by taking a position point a corresponding to the first acceleration point, a deceleration point as a position point C, and a second acceleration point as a position point B as an example:
in the previous driving process, the historical torque change rate of the position point A corresponding to the first acceleration point is 25%, the set torque change rate is exceeded by 20%, the deceleration point is the position point C, the second acceleration point of the last acceleration before the position point C is the position point B, and the historical torque change rate of the position point B is 15%;
then, while traveling again, the torque is increased at the first 250m of the position point a, and the torque is increased at the first torque change rate of 15% (the value of the first torque change rate is reduced by 10% on the basis of the historical torque change rate of the first acceleration point), while also ensuring that the current torque/vehicle speed of the vehicle passing through the position point a again reaches the historical torque/vehicle speed; when the torque is increased through the position point B again, the second torque change rate is 10 percent (the historical torque change rate of the second acceleration point is reduced by 5 percent), the deceleration point is eliminated (if the deceleration point still occurs, the second torque change rate is continuously reduced by 5 percent when the position point B is passed again until the deceleration point is eliminated);
the first torque change rate is 15% having satisfied the requirement of lower than the set torque change rate by 20%, and the deceleration point disappears in the case where the value of the second torque change rate is 10%, so the integrated cost rate is then evaluated, the value of the first torque change rate is changed to 14% next time, and the value of the second torque change rate is changed to 9%; then changing the value of the first torque change rate to 13% and changing the value of the second torque change rate to 8% next time;
comparing the fuel quantity and the driving duration when the first torque change rate is 15%, the second torque change rate is 10%, the fuel quantity and the driving duration when the first torque change rate is 14%, and the second torque change rate is 9%, so as to obtain a first fuel saving rate and a first time change rate, and calculating a first comprehensive cost rate; comparing the fuel quantity when the first torque change rate is 14% and the second torque change rate is 9% with the fuel quantity when the first torque change rate is 13% and the second torque change rate is 8% to obtain a second fuel saving rate and a second time change rate, and calculating to obtain a second comprehensive cost rate;
if the trend of the first integrated cost rate and the second integrated cost rate is close to the target 0, continuing to decrease the value of the first torque change rate, and if the trend of the first integrated cost rate and the second integrated cost rate is far from the target 0, increasing the value of the first torque change rate is needed until the integrated cost rate is 0, and the corresponding first torque change rate and second torque change rate are optimal torque change rates.
In the control process of the constant-speed cruising system, generally, the condition of a road surface is simpler, the condition of increasing the torque change rate and accelerating violently occurs, or the condition of point braking occurs due to overlarge acceleration of acceleration points, namely the phenomenon of the first acceleration point, the second acceleration point and the deceleration point, which is mentioned in the invention, is very rare when the phenomenon of braking occurs immediately after the condition of simultaneously increasing the torque change rate is encountered, but if the condition occurs, any one control mode of the two acceleration points can be adopted for control, and the invention is not limited.
According to the invention, the acceleration points with larger torque change rate are accelerated slowly in advance, so that the acceleration points with deceleration points can reduce the torque change rate, the fuel consumption is reduced with the lowest comprehensive cost, and the comfort of constant-speed cruising is improved.
An embodiment of a fuel-saving control device of a constant-speed cruising system:
the fuel-saving control device of the constant-speed-cruise system provided by the embodiment, as shown in fig. 2, comprises a processor, a memory and a computer program stored in the memory and capable of running on the processor, wherein the processor realizes the fuel-saving control method of the constant-speed-cruise system when executing the computer program.
The hardware structure of the oil saving control device of the constant-speed cruising system in this embodiment is the same as that of the oil saving control device in embodiment 1, and details are not repeated here; the specific implementation process and the effect of the oil-saving control method of the constant-speed-cruise system implemented by the oil-saving control device are described in the above-mentioned constant-speed-cruise system embodiment, and are not described here again.
An embodiment of a fuel-saving control method of a constant-speed cruising system comprises the following steps:
the implementation process and effect of the fuel-saving control method of the cruise control system according to the present embodiment are described in the above-mentioned cruise control system embodiment, and are not described here again.
Embodiment 3
Constant speed cruise system embodiment:
the hardware structure and connection relation of the cruise control system according to this embodiment are the same as those of the cruise control systems according to embodiments 1 and 2, and will not be described here. The difference from the cruise control system in embodiment 1 is that, in order to achieve the fuel saving control more simply, the specific implementation process of the fuel saving control method in this embodiment is shown in fig. 5, which saves the process of evaluating the fuel amount, and the fuel saving effect can be achieved as long as the torque change rate of the first acceleration point is smaller than the set torque change rate.
The definition of the first acceleration point in fig. 5 and how to adjust the first acceleration point are described in embodiment 1, and are not described here.
An embodiment of a fuel-saving control device of a constant-speed cruising system:
the fuel-saving control device of the constant-speed-cruise system provided by the embodiment, as shown in fig. 2, comprises a processor, a memory and a computer program stored in the memory and capable of running on the processor, wherein the processor realizes the fuel-saving control method of the constant-speed-cruise system when executing the computer program.
The hardware structure of the oil saving control device of the constant-speed cruising system in this embodiment is the same as that of the oil saving control device in embodiment 1, and details are not repeated here; the specific implementation process and the effect of the oil-saving control method of the constant-speed-cruise system implemented by the oil-saving control device are described in the above-mentioned constant-speed-cruise system embodiment, and are not described here again.
An embodiment of a fuel-saving control method of a constant-speed cruising system comprises the following steps:
the implementation process and effect of the fuel-saving control method of the cruise control system according to the present embodiment are described in the above-mentioned cruise control system embodiment, and are not described here again.
Embodiment 4
Constant speed cruise system embodiment:
the hardware structure and connection relation of the cruise control system according to this embodiment are the same as those of the cruise control systems according to embodiments 1 and 2, and will not be described here. The difference from the cruise control system in embodiment 2 is that, in order to achieve the fuel saving control more simply, the specific implementation process of the fuel saving control method in this embodiment is shown in fig. 6, which saves the process of evaluating the comprehensive cost, and the fuel saving effect can be achieved as long as the torque change rate of the first acceleration point is smaller than the set torque change rate, and meanwhile, the deceleration point is eliminated to ensure the travelling comfort.
The definitions of the first acceleration point, the second acceleration point, and the braking point (i.e., the deceleration point) in fig. 6 and how to adjust the first acceleration point and the second acceleration point are described in embodiments 1 and 2, and are not described here.
An embodiment of a fuel-saving control device of a constant-speed cruising system:
the fuel-saving control device of the constant-speed-cruise system provided by the embodiment, as shown in fig. 2, comprises a processor, a memory and a computer program stored in the memory and capable of running on the processor, wherein the processor realizes the fuel-saving control method of the constant-speed-cruise system when executing the computer program.
The hardware structure of the oil saving control device of the constant-speed cruising system in this embodiment is the same as that of the oil saving control device in embodiment 1, and details are not repeated here; the specific implementation process and effect of the oil saving control method of the constant-speed-cruise system implemented by the oil saving control device are described in the above-mentioned embodiment 2 of the constant-speed-cruise system, and are not described here again.
An embodiment of a fuel-saving control method of a constant-speed cruising system comprises the following steps:
the implementation process and effect of the fuel-saving control method of the cruise control system according to the present embodiment are described in the above-mentioned cruise control system embodiment, and are not described here again.
Claims (10)
1. The fuel-saving control method of the constant-speed cruising system is characterized by comprising the following steps of:
1) Acquiring a historical driving track of the vehicle in the previous whole driving process; the historical driving track comprises: historical position information of the vehicle, and historical torque and historical vehicle speed corresponding to each historical position;
2) Finding out and storing a first acceleration point with the historical torque change rate exceeding the set torque change rate in the historical driving track;
3) Detecting current position information of a vehicle in a current driving process; increasing torque at a first torque change rate at a set distance from the first acceleration point at the current position, so that the torque/vehicle speed of the current vehicle when the current vehicle runs to the first acceleration point is equal to the historical torque/vehicle speed of the first acceleration point; the first torque change rate is lower than the historical torque change rate of the first acceleration point.
2. The fuel saving control method of a constant speed cruising system according to claim 1, further finding and storing a deceleration point of the vehicle in the history running track and a second acceleration point of the last acceleration before the deceleration point; during the current driving, the vehicle increases torque at a second acceleration point at a second torque change rate that is lower than the historical torque change rate of the second acceleration point.
3. The fuel saving control method of a constant speed cruising system according to claim 1, wherein after the first torque change rate is lower than the set torque change rate, the total fuel amount and the running duration of each whole running are counted, the fuel saving rate is obtained according to the total fuel amount of two continuous whole running, and the time change rate is obtained according to the running duration of two continuous whole running; and adjusting the first torque change rate according to the fuel saving rate and the time change rate.
4. The fuel-saving control method of the constant-speed-cruise system according to claim 3, wherein the fuel-saving rate and the time change rate are weighted and superimposed to obtain a comprehensive cost change rate; adjusting the first torque change rate with the integrated cost change rate equal to 0 as a target; if the comprehensive cost change rate is far from the target, increasing a first torque change rate; if the integrated cost rate of change approaches the target, the first torque rate of change is reduced.
5. The fuel saving control method of a constant speed cruising system according to claim 2, wherein after the first torque change rate is lower than the set torque change rate and the deceleration point is eliminated, the total fuel amount and the running duration of each whole running are counted, the fuel saving rate is obtained according to the total fuel amount of two continuous whole running, and the time change rate is obtained according to the running duration of two continuous whole running; and adjusting the first torque change rate and the second torque change rate according to the fuel saving rate and the time change rate.
6. The fuel-saving control method of the constant-speed-cruise system according to claim 5, wherein the fuel-saving rate and the time change rate are weighted and superimposed to obtain a comprehensive cost change rate; adjusting the first torque change rate and the second torque change rate with the integrated cost change rate equal to 0 as a target; if the comprehensive cost change rate is far away from the target, increasing a first torque change rate and a second torque change rate; if the integrated cost rate of change approaches the target, the first and second torque rates of change are reduced.
7. The fuel saving control method of a constant speed cruising system according to claim 4 or 6, wherein the fuel saving rate corresponds to a weight greater than a weight corresponding to a time change rate.
8. The fuel saving control method of a constant speed cruise system according to claim 1, wherein the set torque change rate is 20%.
9. A fuel saving control device of a constant speed cruise system, characterized by comprising a processor, a memory and a computer program stored in the memory and executable on the processor, the processor realizing the fuel saving control method of the constant speed cruise system according to any one of claims 1-8 when executing the computer program.
10. A constant speed cruising system comprising a GPS positioning module and an information acquisition module, and further comprising a fuel saving control device comprising a processor, a memory and a computer program stored in the memory and executable on the processor, the processor implementing the fuel saving control method of the constant speed cruising system as claimed in any one of claims 1 to 8 when executing the computer program.
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