CN111169290B - Vehicle running speed control method and system - Google Patents
Vehicle running speed control method and system Download PDFInfo
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- CN111169290B CN111169290B CN201811332243.XA CN201811332243A CN111169290B CN 111169290 B CN111169290 B CN 111169290B CN 201811332243 A CN201811332243 A CN 201811332243A CN 111169290 B CN111169290 B CN 111169290B
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- 238000010248 power generation Methods 0.000 claims abstract description 19
- 238000012544 monitoring process Methods 0.000 claims abstract description 15
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- 238000005265 energy consumption Methods 0.000 abstract description 5
- 238000011084 recovery Methods 0.000 description 3
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L7/00—Electrodynamic brake systems for vehicles in general
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/10—Vehicle control parameters
- B60L2240/12—Speed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/42—Drive Train control parameters related to electric machines
- B60L2240/423—Torque
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2250/00—Driver interactions
- B60L2250/26—Driver interactions by pedal actuation
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- Mechanical Engineering (AREA)
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Abstract
The invention provides a vehicle running speed control method and a system, wherein the method comprises the following steps: monitoring the running speed of the vehicle and the opening degree of an accelerator pedal in real time, obtaining a first opening value of the accelerator pedal and a reduction amplitude value of the opening degree of the accelerator pedal after the current running speed of the vehicle and the opening degree of the accelerator pedal are changed, and obtaining a corresponding target vehicle speed according to the first opening value of the accelerator pedal; judging whether the driver has a deceleration intention or not according to the current running speed of the vehicle, the target vehicle speed and the opening degree reduction amplitude value of the accelerator pedal; if the driver has the intention of deceleration, the brake intensity expected by the driver is obtained through the current running speed of the vehicle and the target vehicle speed, and the power generation torque of the vehicle motor is controlled and adjusted according to the expected brake intensity to control the vehicle to run in a deceleration way. The invention balances the contradiction between the electric braking strength and the comfort of the driver and improves the energy consumption level of the vehicle.
Description
Technical Field
The invention relates to the technical field of vehicle control, in particular to a vehicle running speed control method and system.
Background
With the stricter and stricter energy consumption and emission standards, new energy vehicles with various configurations become the research and development focus of various automobile manufacturers, wherein the energy recovery rate directly influences the energy consumption and emission level. The larger the energy recovery rate is, the stronger the electric braking strength is, and when the electric braking strength cannot be consistent with the whole vehicle braking strength expected by a driver, an irreconcilable contradiction can be generated between the energy recovery rate and the driving comfort.
In the existing 3 technical schemes of high-strength electric braking, (1) a braking system is upgraded to a serial braking system, the system can be freely switched between electric braking and hydraulic braking, full electric braking can be realized when the braking demand of a driver is less than a set threshold, the electric braking strength can be changed according to the change of the opening degree of a brake pedal, the hardware cost of the scheme is high, and the maximum set threshold of the electric braking cannot be continuously increased through software after the specification of the hardware is set; (2) the electric brake intensity of different levels is set, a driver can adjust the electric brake intensity in real time according to needs, the electric brake intensity cannot be linearly adjusted in the scheme, and the deceleration of the vehicle has sudden change when the level of the electric brake intensity changes; (3) the scheme does not consider the deceleration intention of a driver, even if the driver does not have the deceleration intention, and when the vehicle speed is increased due to reasons such as downhill and the like, the vehicle-mounted computer actively activates the electric brake to reduce the vehicle speed.
As described above, in the conventional technology, the change in the vehicle speed is not a control target in consideration of the deceleration intention of the driver. Even if the driver does not have the intention of speed reduction, when the vehicle speed is increased due to a downhill and the like, the vehicle-mounted computer actively contacts the power generation brake to reduce the vehicle speed.
Disclosure of Invention
The invention aims to solve the technical problem of providing a vehicle running speed control method and a vehicle running speed control system, wherein the method determines whether a driver has a deceleration intention or not according to the current running speed, a target speed and an accelerator pedal opening degree reduction amplitude value of a vehicle, provides the brake intensity expected by the driver by adjusting the output power generation torque of a motor under the condition of the deceleration intention, balances the brake intensity and the driving comfort and improves the energy consumption level of the vehicle.
In order to solve the above technical problem, the present invention provides a method for controlling a driving speed of a vehicle, the method comprising the steps of:
monitoring the running speed of the vehicle and the opening degree of an accelerator pedal in real time, obtaining a first opening value of the accelerator pedal and a reduction amplitude value of the opening degree of the accelerator pedal after the current running speed of the vehicle and the opening degree of the accelerator pedal are changed, and obtaining a corresponding target vehicle speed according to the first opening value of the accelerator pedal;
judging whether the driver has a deceleration intention or not according to the current running speed of the vehicle, the target vehicle speed and the opening degree reduction amplitude value of the accelerator pedal;
and if the driver has the deceleration intention, obtaining the brake intensity expected by the driver through the current running speed of the vehicle and the target vehicle speed, and controlling and adjusting the generating torque of the vehicle motor according to the expected brake intensity.
The method comprises the following steps of monitoring the running speed of a vehicle and the opening degree of an accelerator pedal in real time, obtaining a first opening value of the accelerator pedal and a reduction amplitude value of the opening degree of the accelerator pedal after the current running speed of the vehicle and the opening degree of the accelerator pedal are changed, and obtaining a corresponding target vehicle speed according to the first opening value of the accelerator pedal, and further comprises the following steps:
and obtaining a second opening value of the accelerator pedal before the opening of the accelerator pedal changes, and calculating to obtain an opening reduction amplitude value of the accelerator pedal according to the first opening value of the accelerator pedal and the second opening value of the accelerator pedal.
Wherein, the step of judging whether the driver has the deceleration intention according to the current running speed of the vehicle, the target vehicle speed and the opening degree reduction amplitude value of the accelerator pedal specifically comprises the following steps:
judging whether the current running speed of the vehicle is greater than the target vehicle speed, if not, judging that the driver has no deceleration intention, if so, further judging whether the opening degree reduction amplitude value of the accelerator pedal is greater than a set threshold, if so, judging that the driver has the deceleration intention, otherwise, judging that the driver has no deceleration intention.
Wherein the method further comprises:
controlling the vehicle motor to be in a driving state when the driver has no intention of deceleration.
If the driver has an intention to decelerate, obtaining the brake strength expected by the driver through the current running speed of the vehicle and the target vehicle speed, and controlling and adjusting the generating torque of the vehicle motor according to the expected brake strength specifically comprises:
calculating the difference value between the current running speed of the vehicle and the target vehicle speed;
obtaining the electric braking strength expected by the driver according to the difference value;
calculating to obtain the expected generating torque of the motor according to the expected electric braking strength;
and adjusting the generating torque of the motor according to the expected generating torque, and controlling the vehicle to run.
Wherein the adjusting the generating torque of the motor according to the expected generating torque and controlling the vehicle to run specifically comprises:
if the vehicle runs on a straight road or an ascending slope, when the current running speed of the vehicle is less than the target speed, controlling a motor of the vehicle to be switched from a power generation state to a driving state, and outputting driving torque to enable the vehicle to run at the target speed;
when the vehicle is in a downhill, the motor is kept in a power generation state, and when the vehicle reaches stress balance, the vehicle keeps running in the balance state.
The present invention also provides a vehicle running speed control system, including:
the monitoring and acquiring unit is used for monitoring the running speed of the vehicle and the opening degree of the accelerator pedal in real time, acquiring a current running speed of the vehicle, a first opening value of the accelerator pedal after the opening degree of the accelerator pedal is changed and a reduction amplitude value of the opening degree of the accelerator pedal, and acquiring a corresponding target vehicle speed according to the first opening value of the accelerator pedal;
the deceleration intention judging unit is used for judging whether the driver has a deceleration intention according to the current running speed of the vehicle, the target vehicle speed and the opening degree reduction amplitude value of the accelerator pedal;
and the vehicle running control unit is used for obtaining the brake intensity expected by the driver through the current running speed of the vehicle and the target vehicle speed when the driver has the deceleration intention, and controlling and adjusting the generating torque of the vehicle motor according to the expected brake intensity.
Wherein the system also comprises an accelerator pedal opening calculating unit,
the monitoring acquisition unit is also used for acquiring a second opening change value of the accelerator pedal before the opening change of the accelerator pedal;
the accelerator pedal opening degree calculating unit is further used for calculating and obtaining an accelerator pedal opening degree reduction amplitude value according to the first accelerator pedal opening degree value and the second accelerator pedal opening degree value.
Wherein the deceleration intention judging unit includes:
the speed judging unit is used for judging whether the current running speed of the vehicle is greater than the target vehicle speed;
and the accelerator pedal opening degree judging unit is used for judging whether the accelerator pedal opening degree reduction amplitude value is larger than a set threshold value or not under the condition that the current running speed of the vehicle is larger than the target vehicle speed.
Wherein the vehicle travel control unit includes:
a speed difference calculation unit for calculating a speed difference between the current running speed of the vehicle and the target speed;
the electric braking strength acquisition unit is used for acquiring the expected electric braking strength of the driver according to the speed difference value;
the generating torque calculating unit is used for calculating and obtaining expected generating torque of the motor according to the expected electric braking strength;
and the adjusting unit is used for adjusting the generating torque of the motor according to the expected generating torque and controlling the vehicle to run at a reduced speed.
The embodiment of the invention has the beneficial effects that: the method comprises the steps of judging whether a driver has a deceleration intention or not by the current running speed of the vehicle, the target vehicle speed and the opening degree reduction amplitude value of the accelerator pedal, and generating the brake strength which is expected to be consistent with the driver by controlling the output value of the power generation torque of the motor when the driver has the deceleration intention.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart illustrating a method for controlling a running speed of a vehicle according to the present invention.
Fig. 2 is a schematic configuration diagram of a vehicle running speed control system of the present invention.
Detailed Description
The following description of the embodiments refers to the accompanying drawings, which are included to illustrate specific embodiments in which the invention may be practiced.
As described below with reference to fig. 1, an embodiment of the present invention provides a method for controlling a driving speed of a vehicle, including the steps of:
s1, monitoring the running speed of the vehicle and the opening degree of the accelerator pedal in real time, obtaining a first opening value of the accelerator pedal and a reduction amplitude value of the opening degree of the accelerator pedal after the current running speed of the vehicle and the opening degree of the accelerator pedal are changed, and obtaining a corresponding target vehicle speed according to the first opening value of the accelerator pedal.
In the running process of the vehicle, a Vehicle Control Unit (VCU) collects the current running speed and the opening degree value of an accelerator pedal of the vehicle through a CAN bus. As the target speed corresponding to the opening degree of the accelerator pedal can be calibrated according to the actual driving feeling in the whole vehicle software development process, each opening degree of the accelerator pedal corresponds to one target speed. The driver controls the opening degree of the accelerator pedal to control the speed of the vehicle.
In order to obtain the variation of the opening degree of the accelerator pedal during each stepping of the accelerator pedal by the driver, a second opening degree value of the accelerator pedal before the opening degree of the accelerator pedal is not changed is monitored, and the reduction amplitude value of the opening degree of the accelerator pedal is obtained by calculating the difference between the second opening degree value of the accelerator pedal and the first opening degree value of the accelerator pedal.
And S2, judging whether the driver has the deceleration intention according to the current running speed of the vehicle, the target vehicle speed and the accelerator pedal opening degree reduction amplitude value.
Judging whether the driver has the deceleration intention according to the current vehicle speed value, the target vehicle speed and the accelerator pedal opening degree reduction amplitude value specifically comprises the following steps: and judging whether the current running speed of the vehicle is greater than the target vehicle speed, if not, indicating that the driver has no deceleration intention, if so, continuing to judge whether the opening degree reduction amplitude value of the accelerator pedal is greater than a set threshold value, if so, indicating that the driver has the deceleration intention, otherwise, indicating that the driver has no deceleration intention.
The deceleration intention of the driver is judged by judging the current running speed of the vehicle and the target vehicle speed and by judging the relation between the accelerator pedal opening degree reduction amplitude value and the preset value when the target vehicle speed is less than the current vehicle speed, so that the situation that the vehicle speed is increased due to a downhill and the driver decelerates under the condition that the driver does not have the deceleration intention is avoided.
And S3, if the driver has the intention of deceleration, obtaining the brake intensity expected by the driver according to the current running speed of the vehicle and the target vehicle speed, and controlling and adjusting the generating torque of the vehicle motor according to the expected brake intensity to control the vehicle to run in a deceleration way.
Specifically, when the driver has an intention to decelerate, an expected braking intensity of the driver is obtained from the current running speed of the vehicle and the target vehicle speed, an expected power generation torque is obtained by calculation from the expected braking intensity, and the power generation torque of the motor is adjusted according to the expected power generation torque.
Specifically, according to the calculation formula of the braking strength:
wherein z is the braking strength, g is the acceleration of gravity, axIs the longitudinal running acceleration of the vehicleIn relation to the current running speed of the vehicle and the target vehicle speed value, it can be seen that the magnitude of the difference between the current running speed of the vehicle and the target vehicle speed represents the magnitude of the braking intensity expected by the driver. In the actual whole vehicle development process, the corresponding relation between the speed difference between the current running speed of the vehicle and the target vehicle speed and the brake strength is calibrated in real vehicle according to the vehicle type development requirement, and the driving feeling of the real vehicle is used as the standard. After the expected braking strength of the driver is obtained, the braking force F borne by the whole vehicle is determinedTotal resistance force＝max＝FResistance 1+FGenerating torqueThe braking force F of the torque transmission of the electric motor can be calculatedGenerating torqueWherein m is the weight of the vehicle, FResistance 1The resultant force of road resistance, wind resistance and hydraulic braking force. And adjusting the actual generating torque of the motor according to the obtained expected generating torque value, and controlling the vehicle to run at a reduced speed. In the case of electric braking, the current running speed of the vehicle gradually decreases, and the motor generation torque also decreases accordingly.
If the vehicle runs on a straight road or an ascending slope, under the condition of electric braking, the current running speed of the vehicle is gradually reduced, and when the current running speed of the vehicle is smaller than the target vehicle speed, the motor is controlled to be switched from a power generation state to a driving state, and driving torque is output to enable the vehicle to run at a constant speed at the target vehicle speed.
If the vehicle runs on a downhill, the motor of the vehicle keeps a power generation state, and when the vehicle reaches stress balance, the vehicle runs in a balance state that the current vehicle speed is greater than the target vehicle speed.
The vehicle running speed control method of the embodiment of the invention further comprises the following steps: when it is judged that the driver has no intention of deceleration, the motor is caused to maintain the driving state. That is, when the current running speed of the vehicle is less than the target vehicle speed value and the current running speed value of the vehicle is greater than the target vehicle speed value, but the magnitude reduction value of the accelerator pedal opening is less than the set threshold value, the vehicle motor maintains the driving state.
According to the control method of the vehicle running speed, whether a driver has a deceleration intention is judged through the current running speed of the vehicle, the target vehicle speed and the opening degree reduction amplitude value of the accelerator pedal, when the driver has the deceleration intention, the output value of the power generation torque of the motor is controlled to generate the brake strength which is expected to be consistent with the driver, on the basis of not changing the structure and the processing cost of a transmission system, the linear control of the electric brake strength is realized through the change of the opening degree of the accelerator pedal, the contradiction between the electric brake strength and the comfort of the driver is balanced, full electric brake is realized on the basis of not sacrificing the driving comfort, the energy consumption level of the vehicle is greatly improved, and the control method has important significance under the large trend of energy conservation and emission reduction.
Based on the first embodiment of the present invention, the second embodiment of the present invention provides a vehicle running speed control system, as shown in fig. 2, the system 1 includes:
the monitoring and acquiring unit 11 is used for monitoring the running speed of the vehicle and the opening degree of the accelerator pedal in real time, acquiring a current running speed of the vehicle, a first opening value of the accelerator pedal after the opening degree of the accelerator pedal is changed and a reduction amplitude value of the opening degree of the accelerator pedal, and acquiring a corresponding target vehicle speed according to the first opening value of the accelerator pedal;
the deceleration intention judging unit 12 is used for judging whether the driver has a deceleration intention according to the current running speed of the vehicle, the target vehicle speed and the opening degree reduction amplitude value of the accelerator pedal;
and a vehicle running control unit 13, configured to obtain a braking strength expected by the driver from the current running speed of the vehicle and the target vehicle speed when the driver has an intention to decelerate, and adjust a power generation torque of the vehicle motor according to the expected braking strength to control vehicle deceleration running.
Wherein the system 1 further comprises an accelerator pedal opening calculation unit,
the monitoring acquisition unit is also used for acquiring a second opening change value of the accelerator pedal before the opening change of the accelerator pedal;
the accelerator pedal opening degree calculating unit is further used for calculating and obtaining an accelerator pedal opening degree reduction amplitude value according to the first accelerator pedal opening degree value and the second accelerator pedal opening degree value.
Wherein the deceleration intention judging unit 12 includes:
the speed judging unit is used for judging whether the current running speed of the vehicle is greater than the target vehicle speed;
and the accelerator pedal opening degree judging unit is used for judging whether the accelerator pedal opening degree reduction amplitude value is larger than a set threshold value or not under the condition that the current running speed of the vehicle is larger than the target vehicle speed.
Wherein the vehicle travel control unit 13 includes:
a speed difference calculation unit for calculating a speed difference between the current running speed of the vehicle and the target speed;
the electric braking strength acquisition unit is used for acquiring the expected electric braking strength of the driver according to the speed difference value;
the generating torque calculating unit is used for calculating and obtaining expected generating torque of the motor according to the expected electric braking strength;
and the adjusting unit is used for adjusting the generating torque of the motor according to the expected generating torque and controlling the vehicle to run at a reduced speed.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (8)
1. A vehicle running speed control method characterized by comprising the steps of:
monitoring the running speed of the vehicle and the opening degree of an accelerator pedal in real time, obtaining a first opening value of the accelerator pedal and a reduction amplitude value of the opening degree of the accelerator pedal after the current running speed of the vehicle and the opening degree of the accelerator pedal are changed, and obtaining a corresponding target vehicle speed according to the first opening value of the accelerator pedal;
judging whether the current running speed of the vehicle is greater than the target vehicle speed, if not, judging that a driver has no deceleration intention, if so, further judging whether the opening degree reduction amplitude value of the accelerator pedal is greater than a set threshold, if so, judging that the driver has the deceleration intention, otherwise, judging that the driver has no deceleration intention;
if the driver has the intention of deceleration, the brake intensity expected by the driver is obtained through the current running speed of the vehicle and the target vehicle speed, and the power generation torque of the vehicle motor is adjusted according to the expected brake intensity to control the vehicle to run in a deceleration way.
2. The method of claim 1, wherein the monitoring the vehicle running speed and the accelerator pedal opening in real time, obtaining a current vehicle running speed, a first accelerator pedal opening value after the accelerator pedal opening is changed, and an accelerator pedal opening reduction amplitude value, and obtaining a corresponding target vehicle speed according to the first accelerator pedal opening value further comprises:
and obtaining a second opening value of the accelerator pedal before the opening of the accelerator pedal changes, and calculating to obtain an opening reduction amplitude value of the accelerator pedal according to the first opening value of the accelerator pedal and the second opening value of the accelerator pedal.
3. The method of claim 1, further comprising:
controlling the vehicle motor to be in a driving state when the driver has no intention of deceleration.
4. The method according to claim 1, wherein obtaining the brake intensity expected by the driver from the current running speed of the vehicle and the target vehicle speed if the driver has an intention to decelerate, and adjusting the generating torque of the vehicle motor according to the expected brake intensity specifically comprises:
calculating the difference value between the current running speed of the vehicle and the target vehicle speed;
obtaining the electric braking strength expected by the driver according to the difference value;
calculating to obtain the expected generating torque of the motor according to the expected electric braking strength;
and adjusting the generating torque of the motor according to the expected generating torque, and controlling the vehicle to run.
5. The method according to claim 4, wherein adjusting the electric power generation torque of the electric motor according to the expected electric power generation torque, and controlling the vehicle to run specifically comprises:
if the vehicle runs on a straight road or an ascending slope, when the current running speed of the vehicle is less than the target speed, controlling a motor of the vehicle to be switched from a power generation state to a driving state, and outputting driving torque to enable the vehicle to run at the target speed;
when the vehicle is in a downhill, the motor is kept in a power generation state, and when the vehicle reaches stress balance, the vehicle keeps running in the balance state.
6. A vehicle travel speed control system, characterized by comprising:
the monitoring and acquiring unit is used for monitoring the running speed of the vehicle and the opening degree of the accelerator pedal in real time, acquiring a current running speed of the vehicle, a first opening value of the accelerator pedal after the opening degree of the accelerator pedal is changed and a reduction amplitude value of the opening degree of the accelerator pedal, and acquiring a corresponding target vehicle speed according to the first opening value of the accelerator pedal;
the deceleration intention judging unit is used for judging whether the driver has a deceleration intention according to the current running speed of the vehicle, the target vehicle speed and the opening degree reduction amplitude value of the accelerator pedal;
the vehicle running control unit is used for obtaining the brake intensity expected by the driver through the current running speed of the vehicle and the target vehicle speed when the driver has the deceleration intention, adjusting the power generation torque of the vehicle motor according to the expected brake intensity and controlling the vehicle to run in a deceleration way;
the deceleration intention determination unit includes:
the speed judging unit is used for judging whether the current running speed of the vehicle is greater than the target vehicle speed;
the accelerator pedal opening degree judging unit is used for judging whether the accelerator pedal opening degree reduction amplitude value is larger than a set threshold value or not under the condition that the current running speed of the vehicle is larger than the target vehicle speed;
the deceleration intention judging unit judges that the driver has no deceleration intention when the current running speed of the vehicle is not greater than the target vehicle speed, if the current running speed of the vehicle is greater than the target vehicle speed, the driver has the deceleration intention when the opening degree reduction amplitude value of the accelerator pedal is greater than a set threshold value, and otherwise, the driver does not have the deceleration intention.
7. The system according to claim 6, further comprising an accelerator pedal opening calculating unit,
the monitoring acquisition unit is also used for acquiring a second opening change value of the accelerator pedal before the opening change of the accelerator pedal;
the accelerator pedal opening degree calculating unit is used for calculating and obtaining an accelerator pedal opening degree reduction amplitude value according to the first accelerator pedal opening degree value and the second accelerator pedal opening degree value.
8. The system according to claim 6, characterized in that the vehicle travel control unit includes:
a speed difference calculation unit for calculating a speed difference between the current running speed of the vehicle and the target vehicle speed;
the electric braking strength acquisition unit is used for acquiring the expected electric braking strength of the driver according to the speed difference value;
the generating torque calculating unit is used for calculating and obtaining expected generating torque of the motor according to the expected electric braking strength;
and the adjusting unit is used for adjusting the generating torque of the motor according to the expected generating torque and controlling the vehicle to run at a reduced speed.
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| CN201811332243.XA CN111169290B (en) | 2018-11-09 | 2018-11-09 | Vehicle running speed control method and system |
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| US7410447B2 (en) * | 2005-10-31 | 2008-08-12 | General Motors Corporation | Vehicle speed control system |
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| EP1826088A2 (en) * | 2006-02-28 | 2007-08-29 | Nissan Motor Co., Ltd. | Engine Control |
| CN105722738A (en) * | 2013-11-12 | 2016-06-29 | 日立汽车系统株式会社 | Moving body drive control device |
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| CN111169290A (en) | 2020-05-19 |
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Effective date of registration: 20211228 Address after: 511434 No. 36, Longying Road, Shilou Town, Panyu District, Guangzhou City, Guangdong Province Patentee after: GAC AION New Energy Vehicle Co.,Ltd. Address before: 510030 23 building, Cheng Yue mansion 448-458, Dongfeng Middle Road, Yuexiu District, Guangzhou, Guangdong. Patentee before: GUANGZHOU AUTOMOBILE GROUP Co.,Ltd. |