CN114834450A - Oil-saving control method and device based on acceleration working condition and vehicle - Google Patents
Oil-saving control method and device based on acceleration working condition and vehicle Download PDFInfo
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- 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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- B60W40/06—Road conditions
- B60W40/076—Slope angle of the road
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B60W40/10—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models related to vehicle motion
- B60W40/107—Longitudinal acceleration
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- B60W40/00—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models
- B60W40/12—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models related to parameters of the vehicle itself, e.g. tyre models
- B60W40/13—Load or weight
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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
- B60W50/00—Details of control systems for road vehicle drive control not related to the control of a particular sub-unit, e.g. process diagnostic or vehicle driver interfaces
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- B60W50/00—Details of control systems for road vehicle drive control not related to the control of a particular sub-unit, e.g. process diagnostic or vehicle driver interfaces
- B60W2050/0001—Details of the control system
- B60W2050/0043—Signal treatments, identification of variables or parameters, parameter estimation or state estimation
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- 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
- B60W2510/00—Input parameters relating to a particular sub-units
- B60W2510/06—Combustion engines, Gas turbines
- B60W2510/0604—Throttle position
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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
- B60W2520/00—Input parameters relating to overall vehicle dynamics
- B60W2520/06—Direction of travel
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- B60W2520/00—Input parameters relating to overall vehicle dynamics
- B60W2520/10—Longitudinal speed
- B60W2520/105—Longitudinal acceleration
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B60—VEHICLES IN GENERAL
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- B60W2552/00—Input parameters relating to infrastructure
- B60W2552/15—Road slope, i.e. the inclination of a road segment in the longitudinal direction
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- 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
- B60W2720/00—Output or target parameters relating to overall vehicle dynamics
- B60W2720/10—Longitudinal speed
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- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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Abstract
The invention discloses an oil-saving control method, device and vehicle based on an acceleration working condition, wherein the method comprises the steps of obtaining the position and the head direction of the vehicle in an electronic map, and obtaining the current road surface gradient and the current region speed limit value according to the position and the head direction of the vehicle in the electronic map; acquiring an accelerator pedal angle and vehicle weight of a vehicle, and acquiring an expected average acceleration according to the accelerator pedal angle and the vehicle weight of the vehicle; obtaining traction power required by the vehicle in a cruising stage according to the current road surface gradient, the current region speed limit value and vehicle parameters; according to the traction power required by the vehicle in the cruising stage, the radius of a tire of the vehicle and the speed ratio of a rear axle, obtaining alternative working condition points of a gearbox of the vehicle at each gear, and selecting a working condition point with the lowest specific oil consumption from the alternative working condition points as an optimal working condition point; and determining the optimal acceleration according to the lowest oil consumption in the acceleration process, and controlling the vehicle to run to the terminal point corresponding to the optimal working condition point at the optimal acceleration.
Description
Technical Field
The invention belongs to the technical field of gear shifting, and particularly relates to an oil-saving control method and device based on an acceleration working condition and a vehicle.
Background
This section provides background information related to the present disclosure only and is not necessarily prior art.
The automatic gearbox has the advantages of convenience in operation, convenience for a user to drive and the like, and the use ratio of the traditional fuel vehicle is gradually increased. In the prior art, the working condition of the vehicle is not considered in the control strategy of the automatic gearbox of the vehicle, the control strategy is lack of pertinence, and the dynamic property and the fuel economy cannot be effectively balanced.
Disclosure of Invention
The invention aims to at least solve the problem that the control strategy of the automatic gearbox in the prior art does not consider the working condition of a vehicle, so that the power smoothness and the fuel economy cannot be effectively balanced. The purpose is realized by the following technical scheme:
the invention provides an oil-saving control method based on an acceleration working condition in a first aspect, which comprises the following steps:
acquiring the position and the head direction of a vehicle in an electronic map, and acquiring the current road surface gradient and the current region speed limit value according to the position and the head direction of the vehicle in the electronic map;
acquiring an accelerator pedal angle and vehicle weight of a vehicle, and acquiring an expected average acceleration according to the accelerator pedal angle and the vehicle weight of the vehicle;
obtaining the traction power required by the vehicle in the cruising stage according to the current road surface gradient, the current region speed limit value and vehicle parameters;
according to the traction power required by the vehicle in the cruising stage, the radius of a tire of the vehicle and the speed ratio of a rear axle, obtaining alternative working condition points of a gearbox of the vehicle at each gear, and selecting a working condition point with the lowest specific oil consumption from the alternative working condition points as an optimal working condition point;
determining an optimal acceleration according to the lowest oil consumption in the acceleration process, and controlling the vehicle to run to a terminal point corresponding to the optimal working condition point at the optimal acceleration; wherein the optimal acceleration is equal to or greater than the desired average acceleration.
The method comprises the steps of determining the current road surface gradient and the current region speed limit value by acquiring the position of a vehicle in an electronic map and the direction of a vehicle head, and acquiring the traction power required by the vehicle in a cruising stage according to the current road surface gradient, the current region speed limit value and vehicle parameters; and then according to the traction power required by the vehicle in the cruising stage, the tire radius of the vehicle and the speed ratio of a rear axle, obtaining alternative working condition points of a gearbox of the vehicle in each gear, selecting an optimal working condition point from the alternative working condition points, operating to a terminal point corresponding to the optimal working condition point according to the determined optimal acceleration, and controlling the vehicle to operate according to the optimal acceleration, wherein the optimal acceleration is more than or equal to the expected average acceleration, so that the vehicle is controlled according to the working condition of the vehicle, parameters in the acceleration process of the whole vehicle are planned, the pertinence is achieved, the power smoothness and the fuel economy of the vehicle are improved, the fuel consumption of an engine is reduced, and the fuel economy of the whole vehicle is improved.
In addition, the fuel-saving control method based on the acceleration working condition can also have the following additional technical characteristics:
in some embodiments of the invention, the desired average acceleration is obtained from the current zone speed limit and an expected vehicle acceleration time, wherein the expected vehicle acceleration time is obtained by a map.
In some embodiments of the invention, the vehicle parameters include vehicle weight, tire rolling resistance coefficient, and vehicle wind resistance coefficient.
In some embodiments of the invention, the traction power required for the vehicle to enter the cruise phase is calculated by the following formula:
wherein, W cruise For tractive power, F cruise To a traction force, C wind Is the wind resistance coefficient of the vehicle, C tyre Is the coefficient of rolling resistance of the tire, m v As the weight of the vehicle, S road Is the road surface gradient, v max And the current region speed limit value.
In some embodiments of the present invention, the determining the optimal acceleration according to the lowest fuel consumption during the acceleration process includes:
acquiring total oil consumption corresponding to running at different average accelerations in the acceleration process;
determining an optimal acceleration according to the minimum value of the total oil consumption;
the acceleration process is that the vehicle accelerates from a static state to a terminal point, and the terminal point corresponds to the optimal working condition point.
In some embodiments of the present invention, the total fuel consumption in the acceleration process is obtained by calculating the following formula
Wherein,
for total oil consumption, n engine (T) is the rotational speed, T engine (t) is torque, e bsfc [n engine (t),T engine (t)]Is n engine (t)、T engine (t) specific fuel consumption on the universal characteristic diagram.
In some embodiments of the invention, determining the optimal acceleration from the minimum value of said total fuel consumption comprises in particular:
wherein,
is a function of the average set acceleration,
is the total oil consumption amount of the oil,
for optimum acceleration, a exp To expect average acceleration, T ext Representing engine torque T during acceleration as engine external characteristic curve torque engine The output of (t) cannot exceed the limits of the outer characteristic curve.
When the vehicle runs at different average accelerations, the used total oil consumption is different, different total oil consumption is obtained by selecting a plurality of different average accelerations, and the optimal acceleration is determined by selecting the lowest oil consumption, so that the vehicle can be controlled at the optimal acceleration, and the aim of saving oil is fulfilled.
In some embodiments of the invention, said controlling said vehicle to operate at said optimal acceleration comprises in particular controlling a gear shifting process of said gearbox with a rotational speed, torque calculated according to said optimal acceleration;
in the formula, F acc (t) is the traction force at time t,
is the sum of all rotational inertia forces;
the formula for calculating the rotating speed is as follows:
n engine (t)＝v veh (t)r bridge r gearBox (t)/[R tyre ]
in the formula, n engine (t) is the engine speed at time t, v veh (t) is the speed of the whole vehicle at time t, r bridge For rear axle speed ratio, R tyre Is the radius of the tire, r gearBox (t) is the speed ratio of the gearbox at time t;
the torque calculation formula is:
T engine (t)＝F acc (t)[R tyre ]/[r bridge r gearBox (t)]
in the formula, T engine (t) torque of the engine at time t, r bridge For rear axle speed ratio, R tyre Is the radius of the tire, r gearBox (t) is the speed ratio of the gearbox at time t, F acc (t) is the traction force at time t.
A second aspect of the present invention provides an acceleration-condition-based fuel-saving control device for executing the acceleration-condition-based fuel-saving control method in the above-described embodiment, the fuel-saving control device including:
the system comprises an acquisition unit, a display unit and a control unit, wherein the acquisition unit is used for acquiring the position and the head direction of a vehicle in an electronic map and acquiring the current road surface gradient and the current region speed limit value according to the position and the head direction of the vehicle in the electronic map;
acquiring an accelerator pedal angle and vehicle weight of the vehicle;
a first calculation unit for obtaining a desired average acceleration from an accelerator pedal angle of a vehicle and a vehicle weight;
the second calculating unit is used for obtaining the traction power required by the vehicle in a cruising stage according to the current road surface gradient, the current region speed limit value and vehicle parameters;
the execution unit is used for obtaining the alternative working condition points of the gearbox of the vehicle at each gear according to the traction power required by the vehicle in the cruising stage, the radius of the tire of the vehicle and the speed ratio of the rear axle, and selecting the working condition point with the lowest specific oil consumption from the alternative working condition points as the optimal working condition point;
determining an optimal acceleration according to the lowest oil consumption in the acceleration process, and controlling the vehicle to run to a terminal point corresponding to the optimal working condition point at the optimal acceleration; wherein the optimal acceleration is equal to or greater than the desired average acceleration.
The invention obtains the position and the head direction of a vehicle in an electronic map through an obtaining unit, determines the current road surface gradient and the current area speed limit value, obtains the traction power required by the vehicle in a cruising stage through a second calculating unit, then obtains the alternative working condition points of a gearbox of the vehicle in each gear according to the traction power required by the vehicle in the cruising stage, the tire radius of the vehicle and the rear axle speed ratio by an executing unit, selects the optimal working condition point from the alternative working condition points, operates to the terminal point corresponding to the optimal working condition point according to the determined optimal acceleration, and controls the vehicle to operate with the optimal acceleration, wherein the optimal acceleration is more than or equal to the expected average acceleration calculated by a first calculating unit, thereby controlling the vehicle according to the working condition of the vehicle and planning the parameters in the acceleration process of the whole vehicle, the method has higher pertinence, improves the power smoothness and the fuel economy of the vehicle, reduces the oil consumption of the engine and improves the fuel economy of the whole vehicle.
A third aspect of the invention proposes a vehicle comprising:
the fuel-saving control device based on the acceleration condition and the memory are stored, and programs or instructions operated on the fuel-saving control device are stored in the memory, and when the programs or the instructions are executed by the fuel-saving control device, the steps of the fuel-saving control method based on the acceleration condition are realized.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like parts are designated by like reference numerals throughout the drawings. In the drawings:
FIG. 1 schematically shows a flowchart of a fuel saving control method based on an acceleration condition according to an embodiment of the present invention;
fig. 2 schematically shows an engine universal characteristic diagram according to an embodiment of the invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless specifically identified as an order of performance. It should also be understood that additional or alternative steps may be used.
Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
For convenience of description, spatially relative terms, such as "inner", "outer", "lower", "below", "upper", "above", and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" can include both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
As shown in fig. 1 to 2, according to an embodiment of the present invention, a fuel saving control method based on an acceleration condition is provided, including:
s11, acquiring the position and the head direction of the vehicle in the electronic map, and acquiring the current road surface gradient and the current area speed limit value according to the position and the head direction of the vehicle in the electronic map;
s12, acquiring an accelerator pedal angle and a vehicle weight of the vehicle, and acquiring an expected average acceleration according to the accelerator pedal angle and the vehicle weight of the vehicle;
s13, obtaining the traction power required by the vehicle in the cruising stage according to the current road gradient, the current region speed limit value and the vehicle parameters;
s14, obtaining alternative working condition points of a gearbox of the vehicle in each gear according to the traction power required by the vehicle in the cruising stage, the radius of a tire of the vehicle and the speed ratio of a rear axle, and selecting the working condition point with the lowest specific oil consumption from the alternative working condition points as an optimal working condition point;
and S15, determining the optimal acceleration according to the lowest oil consumption in the acceleration process, and controlling the vehicle to run to the end point corresponding to the optimal working condition point at the optimal acceleration, wherein the optimal working condition point is the end point of the vehicle acceleration process.
The method comprises the steps of determining the current road surface gradient and the current region speed limit value by acquiring the position of a vehicle in an electronic map and the direction of a vehicle head, and acquiring the traction power required by the vehicle in a cruising stage according to the current road surface gradient, the current region speed limit value and vehicle parameters; and then according to the traction power required by the vehicle in the cruising stage, the tire radius of the vehicle and the speed ratio of a rear axle, obtaining alternative working condition points of a gearbox of the vehicle in each gear, selecting an optimal working condition point from the alternative working condition points, operating to a terminal point corresponding to the optimal working condition point according to the determined optimal acceleration, and controlling the vehicle to operate according to the optimal acceleration, wherein the optimal acceleration is more than or equal to the expected average acceleration, so that the vehicle is controlled according to the working condition of the vehicle, parameters in the acceleration process of the whole vehicle are planned, the pertinence is achieved, the power smoothness and the fuel economy of the vehicle are improved, the fuel consumption of an engine is reduced, and the fuel economy of the whole vehicle is improved.
In S12, the desired average acceleration is obtained from the current zone speed limit and the expected vehicle acceleration time, which is obtained by a map. Specifically, it can be obtained by the following formula calculation.
Wherein, a exp To desired average acceleration, v max For the current zone speed limit, t exp For the expected acceleration time, t exp Can be obtained by checking and calibrating a map according to the angle of the accelerator pedal and the weight of the vehicle, t exp The expected vehicle acceleration time for the driver.
In some alternative embodiments, the vehicle parameters include vehicle weight, tire rolling resistance coefficient, and vehicle wind resistance coefficient, which are important parameters during vehicle travel that are needed to calculate the traction required of the vehicle in entering cruise phase.
In some alternative embodiments, the traction power required for the vehicle to enter the cruise phase is calculated by the following formula:
wherein, W cruise For tractive power, F cruise To a traction force, C wind Is the wind resistance coefficient of the vehicle, C tyre Is the coefficient of rolling resistance of the tire, m v As the weight of the vehicle, S road Is the road surface gradient, v max And limiting the speed value of the current area. Wherein the tractive force F cruise The method is obtained by calculation on the premise of unchanged gradient, and the traction power required by the vehicle in the cruising stage is obtained through the traction force and the current zone speed limit value.
Obtaining the traction power F required for the vehicle to enter the cruise phase cruise And then, visualizing an equipower line in the engine characteristic diagram, as shown in fig. 2, wherein the equipower line is a smooth curve, visualizing the equipower line in the engine characteristic diagram, and selecting an optimal working condition point through a visualized working condition point, wherein the optimal working condition point is the working condition point with the lowest specific fuel consumption, as shown in fig. 2, the second working condition point is the optimal working condition point from the left side, and six working condition points are totally included in fig. 2. By setting the optimal working condition point, the engine can operate in an economic area more under the comprehensive oil consumption working condition of the whole vehicle, the oil consumption of the engine is reduced, and the fuel economy of the whole vehicle is improved.
In some optional embodiments, determining the optimal acceleration with the lowest fuel consumption for the acceleration process comprises:
acquiring total oil consumption corresponding to running at different average accelerations in the acceleration process;
determining an optimal acceleration according to the minimum value of the total oil consumption;
the acceleration process is that the vehicle accelerates from a static state to a terminal point, and the terminal point corresponds to the optimal working condition point. Wherein, according to the stability requirement, the acceleration a of the vehicle in the acceleration process veh The rate of change of (t) is small, i.e.
The problem can be converted into the average set acceleration
As an independent variable, with
For constraints to accelerate process fuel consumption
Is an optimization problem of the cost function. When the automatic mechanical gearbox is cut into different gears, a fixed engine speed is usually required to be matched, and a plurality of gear shifting speed lines corresponding to the gears one to one can be defined. As shown in fig. 2, there are multiple gear shifts during the process of engine acceleration from idle speed state to end state, for simplicity, the number of gear shifts is set to two, two gear shift speed lines are provided, and since the engine speed of previous gear shifts is known, when the engine speed is known
During determination, tire traction, engine speed, and engine torque at various times during the entire acceleration process may be calculated based on the speed, grade, and windage coefficient of the vehicle.
In the formula, F acc (t) traction at time t, C wind Is the wind resistance coefficient of the vehicle, C tyre Is the coefficient of rolling resistance of the tire, m v Is the weight of the vehicleAmount, S road Is the road surface gradient, v veh (t) is the speed value at time t,
is the sum of the rotational inertia forces.
In fig. 2, an outer characteristic curve is provided, and it is necessary to define the torque within the range defined by the outer characteristic curve. The rotating speed acceleration line and the gear shifting transition line are smooth curves. The isocratic oil consumption lines are annular, and a plurality of isocratic oil consumption lines are arranged in the oil consumption measuring device in the figure 2, wherein the minimum value of the isocratic oil consumption lines is positioned at the innermost side. The number of the equal power lines is one, and the control of the gear shifting process can be facilitated by visually displaying related parameters in the universal characteristic diagram.
The rotating speed of the engine is calculated by the formula
n engine (t)＝v veh (t)r bridge r gearBox (t)/[R tyre ]
In the formula, n engine (t) is the engine speed at time t, v veh (t) is the speed of the whole vehicle at time t, r bridge For rear axle speed ratio, R tyre Is the radius of the tire, r gearBox And (t) is the speed ratio of the gearbox at the moment t, and changes along with gear shifting.
The torque of the engine is calculated by the formula
T engine (t)＝F acc (t)[R tyre ]/[r bridge r gearBox (t)]
In the formula, T engine (t) torque of the engine at time t, r bridge For rear axle speed ratio, R tyre Is the radius of the tire, r gearBox (t) is the speed ratio of the gearbox at time t, F acc (t) is the traction force at time t.
In some alternative embodiments, the total fuel consumption during acceleration is obtained by calculating the following formula
Wherein,
for total oil consumption, n engine (T) is the rotational speed, T engine (t) is torque, e bsfc [n engine (t),T engine (t)]Is n engine (t)、T engine (t) specific fuel consumption on the universal characteristic diagram.
In some alternative embodiments, the determining the optimal acceleration from the minimum value of the total fuel consumption particularly comprises:
wherein,
is a function of the average set acceleration,
is the total oil consumption amount of the oil,
for optimum acceleration, a exp To expect average acceleration, T ext Representing engine torque T during acceleration as engine external characteristic curve torque engine The output of (t) cannot exceed the limits of the outer characteristic curve.
The average set acceleration has a plurality of values, the total oil consumption in the acceleration process is different according to different average set accelerations, the optimal acceleration is determined according to the minimum value in the total oil consumption, so that the acceleration control can be realized under the condition that the oil consumption is minimum, and the optimal acceleration can be obtained by adopting a dichotomy.
In some optional embodiments, the controlling the vehicle to operate at the optimal acceleration specifically includes controlling the gear shifting of the transmission with the rotation speed and the torque calculated according to the optimal acceleration, so as to control the acceleration process of the vehicle, and plan the transition path of the rotation speed and the torque in the acceleration process of the whole vehicle, so as to improve the power smoothness and the economy of the whole vehicle.
The invention also discloses an oil-saving control device based on the acceleration working condition, which comprises: the device comprises an acquisition unit, a first calculation unit, a second calculation unit and an execution unit; the acquisition unit is used for acquiring the position and the head direction of the vehicle in the electronic map and acquiring the current road surface gradient and the current region speed limit value according to the position and the head direction of the vehicle in the electronic map; the acquisition unit is also used for acquiring the accelerator pedal angle and the vehicle weight of the vehicle; the first calculation unit is used for obtaining expected average acceleration according to the accelerator pedal angle of the vehicle and the weight of the vehicle; the second calculation unit is used for obtaining the traction power required by the vehicle in the cruising stage according to the current road gradient, the current region speed limit value and the vehicle parameters; the execution unit is used for obtaining alternative working condition points of a gearbox of the vehicle at each gear according to the traction power required by the vehicle in the cruising stage, the radius of a tire of the vehicle and the speed ratio of a rear axle, and selecting the working condition point with the lowest specific oil consumption from the alternative working condition points as an optimal working condition point; and determining the optimal acceleration according to the lowest oil consumption in the acceleration process, wherein the optimal working condition point is the terminal point of the vehicle acceleration process, and controlling the vehicle to run to the optimal working condition point at the determined optimal acceleration.
The invention obtains the position and the head direction of the vehicle in the electronic map through the obtaining unit, determines the current road gradient and the current area speed limit value, obtains the traction power required by the vehicle in the cruising stage through the second calculating unit, then obtains the alternative working condition points of the gearbox of the vehicle in each gear according to the traction power required by the vehicle in the cruising stage, the tire radius of the vehicle and the rear axle speed ratio by the executing unit, selects the optimal working condition point from the alternative working condition points, operates to the terminal point corresponding to the optimal working condition point according to the determined optimal acceleration, and controls the vehicle to operate with the optimal acceleration, wherein the optimal acceleration is more than or equal to the expected average acceleration calculated by the first calculating unit, thereby controlling the vehicle according to the working condition of the vehicle and planning the parameters in the acceleration process of the whole vehicle, the method has higher pertinence, improves the power smoothness and the fuel economy of the vehicle, reduces the oil consumption of the engine and improves the fuel economy of the whole vehicle.
In some alternative embodiments, the first calculation unit is according to a formula
The desired average acceleration is obtained. Wherein, a exp To desired average acceleration, v max For the current zone speed limit, t exp For the expected acceleration time, t exp Can be obtained by checking and calibrating a map according to the angle of the accelerator pedal and the weight of the vehicle, t exp The expected vehicle acceleration time for the driver.
The invention also discloses a vehicle which comprises the fuel-saving control device based on the acceleration working condition and a memory, wherein the memory stores a program or an instruction which can run on the fuel-saving control device, and the program or the instruction realizes the steps of the fuel-saving control method based on the acceleration working condition in the embodiment when being executed by the fuel-saving control device.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A fuel-saving control method based on an acceleration working condition is characterized by comprising the following steps:
acquiring the position and the head direction of a vehicle in an electronic map, and acquiring the current road surface gradient and the current region speed limit value according to the position and the head direction of the vehicle in the electronic map;
acquiring an accelerator pedal angle and vehicle weight of a vehicle, and acquiring an expected average acceleration according to the accelerator pedal angle and the vehicle weight of the vehicle;
obtaining the traction power required by the vehicle in the cruising stage according to the current road surface gradient, the current region speed limit value and vehicle parameters;
according to the traction power required by the vehicle in the cruising stage, the radius of a tire of the vehicle and the speed ratio of a rear axle, obtaining alternative working condition points of a gearbox of the vehicle at each gear, and selecting a working condition point with the lowest specific oil consumption from the alternative working condition points as an optimal working condition point;
determining an optimal acceleration according to the lowest oil consumption in the acceleration process, and controlling the vehicle to run to a terminal point corresponding to the optimal working condition point at the optimal acceleration; wherein the optimal acceleration is equal to or greater than the desired average acceleration.
2. The acceleration-condition-based fuel-saving control method according to claim 1, characterized in that the desired average acceleration is obtained from the current zone speed limit value and an expected vehicle acceleration time, wherein the expected vehicle acceleration time is obtained by a map.
3. The acceleration-condition-based fuel-saving control method according to claim 1, wherein the vehicle parameters include vehicle weight, tire rolling resistance coefficient, and vehicle wind resistance coefficient.
4. The acceleration-condition-based fuel-saving control method according to claim 3, wherein the traction power required for the vehicle to enter the cruise phase is calculated by the following formula:
wherein, W cruise For tractive power, F cruise To a traction force, C wind Is the wind resistance coefficient of the vehicle, C tyre Is the coefficient of rolling resistance of the tire, m v As the weight of the vehicle, S road Is the road surface gradient, v max And the current region speed limit value.
5. The acceleration-condition-based fuel-saving control method according to claim 1, wherein the determining the optimal acceleration according to the lowest fuel consumption during acceleration comprises:
acquiring total oil consumption corresponding to running at different average accelerations in the acceleration process;
determining an optimal acceleration according to the minimum value of the total oil consumption;
the acceleration process is that the vehicle accelerates from a static state to a terminal point, and the terminal point corresponds to the optimal working condition point.
6. The acceleration-condition-based fuel-saving control method according to claim 5, wherein the total fuel consumption in the acceleration process is obtained by calculation using the following formula
Wherein,
for total oil consumption, n engine (T) is the rotational speed, T engine (t) is torque, e bsfc [n engine (t),T engine (t)]Is n engine (t)、T engine (t) specific fuel consumption on the universal characteristic diagram.
7. The acceleration-condition-based fuel-saving control method according to claim 5, wherein the determining the optimal acceleration according to the minimum value of the total fuel consumption specifically includes:
in the formula,
is an average settingAs a function of the acceleration,
is the total oil consumption amount of the oil,
for optimum acceleration, a exp To expect average acceleration, T ext Representing engine torque T during acceleration as engine external characteristic curve torque engine The output of (t) cannot exceed the limits of the outer characteristic curve.
8. The acceleration-condition-based fuel-saving control method according to claim 1, wherein the controlling the vehicle to run at the optimal acceleration specifically includes controlling a shifting process of the transmission with a rotational speed and a torque calculated according to the optimal acceleration;
in the formula, F acc (t) is the traction force at time t,
is the sum of all rotational inertia forces;
the formula for calculating the rotating speed is as follows:
n engine (t)＝v veh (t)r bridge r gearBox (t)/[R tyre ]
in the formula, n engine (t) is the engine speed at time t, v veh (t) is the speed of the whole vehicle at time t, r bridge For rear axle speed ratio, R tyre Is the radius of the tire, r gearBox (t) is the speed ratio of the gearbox at time t;
the torque calculation formula is:
T engine (t)＝F acc (t)[R tyre ]/[r bridge r gearBox (t)]
in the formula, T engine (t) torque of the engine at time t, r bridge For rear axle speed ratio, R tyre Is the radius of the tire, r gearBox (t) is the speed ratio of the gearbox at time t, F acc (t) is the traction force at time t.
9. An acceleration-condition-based fuel-saving control device, characterized in that the acceleration-condition-based fuel-saving control device is used for executing the acceleration-condition-based fuel-saving control method according to any one of claims 1 to 8, and the fuel-saving control device includes:
the system comprises an acquisition unit, a display unit and a control unit, wherein the acquisition unit is used for acquiring the position and the head direction of a vehicle in an electronic map and acquiring the current road surface gradient and the current region speed limit value according to the position and the head direction of the vehicle in the electronic map; and
acquiring an accelerator pedal angle and vehicle weight of a vehicle;
a first calculation unit for obtaining a desired average acceleration from an accelerator pedal angle of a vehicle and a vehicle weight;
the second calculating unit is used for obtaining the traction power required by the vehicle in a cruising stage according to the current road surface gradient, the current region speed limit value and vehicle parameters;
the execution unit is used for obtaining the alternative working condition points of the gearbox of the vehicle at each gear according to the traction power required by the vehicle in the cruising stage, the radius of the tire of the vehicle and the speed ratio of the rear axle, and selecting the working condition point with the lowest specific oil consumption from the alternative working condition points as the optimal working condition point;
determining an optimal acceleration according to the lowest oil consumption in the acceleration process, and controlling the vehicle to run to a terminal point corresponding to the optimal working condition point at the optimal acceleration; wherein the optimal acceleration is equal to or greater than the desired average acceleration.
10. A vehicle, characterized by comprising:
the acceleration-condition-based fuel-saving control apparatus according to claim 9; and
a memory on which a program or instructions executable on the fuel saving control device are stored, the program or instructions, when executed by the fuel saving control device, implementing the steps of the acceleration condition-based fuel saving control method according to claim 1.
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