CN114294412A - Pure electric commercial vehicle, control system and starting gear control method - Google Patents
Pure electric commercial vehicle, control system and starting gear control method Download PDFInfo
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- CN114294412A CN114294412A CN202111662189.7A CN202111662189A CN114294412A CN 114294412 A CN114294412 A CN 114294412A CN 202111662189 A CN202111662189 A CN 202111662189A CN 114294412 A CN114294412 A CN 114294412A
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Abstract
The invention discloses a pure electric commercial vehicle, a control system and a starting gear control method, wherein the starting gear control method comprises the following steps: the suspension controller acquires the real-time whole vehicle load of the vehicle and transmits the load to the whole vehicle controller and the gearbox controller; the vehicle control unit calculates a driving demand torque according to the opening degree of an accelerator pedal and transmits the driving demand torque to the power system controller and the gearbox controller; the power system controller controls the driving motor to rotate at a target rotating speed according to the driving demand torque and the motor MAP curve chart; and the gearbox controller calculates to obtain a corresponding gearbox speed change ratio according to the driving demand torque, the whole vehicle load, the drive axle reduction ratio and the diameter of the driving wheel, and controls the gearbox to adjust to a gear matched with the gearbox speed change ratio. The starting gear control method provided by the invention enables the vehicle to select a reasonable starting gear under any working conditions such as a starting stage and a stable driving stage, thereby improving the driving performance and the performance of the vehicle in the starting stage.
Description
Technical Field
The invention relates to the technical field of electric vehicles, in particular to a starting gear control method. The invention further relates to a control system for implementing the starting gear control method and a pure electric commercial vehicle comprising the control system.
Background
The power transmission chain of the pure electric AMT commercial automobile comprises the following components: the driving motor drives the vehicle to move forward through the gearbox, the transmission shaft, the driving axle and the driving wheel, and compared with a traditional fuel engine vehicle, the pure electric AMT (electrically controlled mechanical gearbox) is free of a clutch and a control mechanism thereof.
Two common solutions exist: firstly, the load information of the vehicle is transmitted to a TCU (transmission control unit) and a VCU (vehicle control unit) through a light switch and a heavy switch, so that the operation steps of a driver are increased, the driving experience and the convenience of the driver are not facilitated, and in the actual operation process, the load condition of the vehicle is different, and the whole working condition of the vehicle cannot be covered. And in the second scheme, after the vehicle starts and runs for a period of time, the stable and accurate vehicle load condition is measured and calculated after the vehicle runs stably, so that the method has no great practical significance in the vehicle starting process and cannot improve the performance in the starting process.
In summary, how to improve the performance of the vehicle at the starting stage is a problem to be solved urgently by those skilled in the art.
Disclosure of Invention
In view of the above, the present invention provides a starting gear control method, so that a vehicle can select a reasonable starting gear under any working conditions, such as a starting stage and a stable driving stage, to improve drivability and performance of the vehicle at the starting stage.
Another object of the invention is to provide a control system for implementing the starting gear control method and a pure electric commercial vehicle comprising the control system.
In order to achieve the above purpose, the invention provides the following technical scheme:
a starting gear control method is applied to a control system, wherein the control system comprises a vehicle control unit, a gearbox controller, a power system controller and a suspension controller; the starting gear control method comprises the following steps:
the suspension controller acquires a real-time vehicle load of a vehicle and transmits the acquired vehicle load to the vehicle controller and the gearbox controller;
the vehicle control unit calculates a driving demand torque according to the opening degree of an accelerator pedal and transmits the driving demand torque to the power system controller and the gearbox controller;
the power system controller acquires a target rotating speed of a driving motor according to the driving demand torque and a motor MAP curve chart and controls the driving motor to rotate at the target rotating speed;
the gearbox controller calculates to obtain a corresponding gearbox speed change ratio according to the driving demand torque, the whole vehicle load, the drive axle reduction ratio and the diameter of the driving wheel;
the gearbox controller controls the gearbox to adjust to a gear matched with the gearbox speed ratio.
Optionally, the acquiring, by the suspension controller, a real-time vehicle load of a vehicle, and transmitting the acquired vehicle load to the vehicle controller and the transmission controller includes:
judging whether the whole vehicle controller, the gearbox controller, the power system controller and the suspension controller are in fault, if not, entering the step that the suspension controller acquires the whole vehicle load of the vehicle, and transmitting the acquired whole vehicle load to the whole vehicle controller and the gearbox controller; and if the fault occurs, entering a fault mode.
Optionally, the suspension controller obtains a real-time vehicle load of a vehicle, and transmits the obtained vehicle load to the vehicle controller and the transmission controller, including:
the suspension controller acquires each single-shaft load of the drive axle;
the suspension controller calculates a total load value added by the single-shaft loads;
the suspension controller calculates the weight of the whole vehicle according to the total load value;
and the suspension controller transmits the whole vehicle weight to the whole vehicle controller and the gearbox controller.
Optionally, the suspension controller includes a plurality of airbags provided to the drive axle, and the obtaining of the respective uniaxial loads of the drive axle includes:
the suspension controller acquires the measured pressure values corresponding to all the air bags in the single shaft and the cross section diameters corresponding to the air bags;
the suspension controller is based on
Calculating load single values corresponding to the air bags in the single shaft; wherein, PijMeasured pressure value of jth air bag of ith shaft, P0 atmospheric pressure value, D cross-section diameter of air bag, aijIs the effective coefficient of the section of the jth air bag of the ith shaft, fijA jth airbag load correction value for the ith axis;
and the suspension controller adds the load single values corresponding to the air bags in the single shaft to obtain the single-shaft load.
Optionally, the gearbox controller calculates to obtain a corresponding gearbox speed ratio according to the driving demand torque, the vehicle weight, the drive axle reduction ratio and the drive wheel diameter, and the method includes:
the gearbox controller calculates the wheel-side driving torque of the rear driving wheel according to the weight of the whole vehicle;
and the gearbox controller calculates to obtain a corresponding gearbox speed change ratio according to the driving demand torque, the wheel side driving torque, the drive axle reduction ratio and the driving wheel diameter.
A control system for implementing the starting gear control method described in any one of the above, comprising:
the suspension controller is used for acquiring the whole vehicle load of the vehicle and transmitting the acquired whole vehicle load to the whole vehicle controller and the gearbox controller;
the vehicle control unit calculates a driving demand torque according to the opening degree of an accelerator pedal and transmits the driving demand torque to the power system controller and the gearbox controller;
the power system controller acquires a target rotating speed of a driving motor according to the driving demand torque and a motor MAP curve chart and controls the driving motor to rotate at the target rotating speed;
the gearbox controller calculates and obtains a corresponding gearbox speed change ratio according to the driving demand torque, the whole vehicle load, the reduction ratio of the drive axle and the diameter of the driving wheel; and controlling the gearbox to adjust to a gear matched with the speed change ratio of the gearbox.
Optionally, the suspension controller comprises a plurality of air bags arranged on the drive axle and a pressure sensor for measuring the pressure value of the air bags.
Optionally, the suspension controller includes a displacement sensor disposed on the drive axle, and the suspension controller may calculate the load of the entire vehicle according to displacement information measured by the displacement sensor.
A pure electric commercial vehicle comprises the control system.
In the process of implementing the starting gear control method provided by the invention, firstly, a suspension controller acquires the real-time vehicle load of a vehicle and transmits the acquired vehicle load to a vehicle controller and a gearbox controller; the vehicle control unit calculates a driving demand torque according to the opening degree of an accelerator pedal, transmits the driving demand torque to the power system controller and the gearbox controller, and the power system controller acquires a target rotating speed of the driving motor according to the driving demand torque and a motor MAP curve graph and controls the driving motor to rotate at the target rotating speed; the gearbox controller calculates to obtain a corresponding gearbox speed change ratio according to the driving demand torque, the whole vehicle load, the reduction ratio of the drive axle and the diameter of the driving wheel; and controls the gearbox to adjust to a gear matching the gearbox ratio.
Compared with the prior art, the starting gear control method provided by the invention can acquire the whole vehicle load of the vehicle in real time in the real-time process, and transmits the acquired whole vehicle load to the whole vehicle controller and the gearbox controller, so that the gearbox controller can calculate the reasonable gearbox gear ratio corresponding to the real-time whole vehicle load according to the driving required torque, the whole vehicle load, the drive axle reduction ratio and the diameter of the driving wheel, and the vehicle can select reasonable starting gears in each stage such as a starting stage and a stable operation stage, thereby improving the driving performance and the performance of the vehicle in the starting stage.
In addition, the invention also provides a control system for implementing the starting gear control method and a pure electric commercial vehicle comprising the control system.
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 embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a power transmission device in a pure electric commercial vehicle provided by the invention;
FIG. 2 is a schematic view of a partial structure of a pure electric commercial vehicle provided by the invention;
FIG. 3 is a schematic structural diagram of an embodiment of a control system provided in the present invention;
fig. 4 is a flowchart illustrating a starting gear control method according to an embodiment of the present invention.
In fig. 1-4:
the device comprises an airbag 1, a pressure sensor 2, a vehicle girder upper wing surface 3, a vehicle girder lower wing surface 4, a driving axle connecting piece 5, a driving motor 6, a gearbox 7, a transmission shaft 8, a driving axle 9, a whole vehicle air pressure sensor 10, a power system controller 11, a whole vehicle controller 12, an air suspension 13, a gearbox controller 14 and a driving wheel 15.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The core of the invention is to provide a starting gear control method, which enables a vehicle to select a reasonable starting gear under any working conditions such as a starting stage, a stable driving stage and the like, thereby improving the driving performance and the performance of the vehicle in the starting stage. The invention further provides a control system for implementing the starting gear control method and a pure electric commercial vehicle comprising the control system.
Please refer to fig. 1 to fig. 4.
The specific embodiment discloses a starting gear control method which is applied to a control system, wherein the control system comprises a vehicle control unit 12, a gearbox controller 14, a power system controller 11 and a suspension controller; the starting gear control method comprises the following steps:
step S1, the suspension controller acquires the real-time vehicle load of the vehicle and transmits the acquired vehicle load to the vehicle controller 12 and the transmission controller 14;
it should be noted that the suspension controller is provided with a load sensor for measuring the load of the entire vehicle.
Step S2, the vehicle control unit 12 calculates a driving demand torque according to the opening degree of an accelerator pedal, and transmits the driving demand torque to the power system controller 11 and the gearbox controller 14;
in the driving process, the driving intention of the driver can be reflected through the opening degree of the accelerator, and the vehicle control unit 12 calculates the driving demand torque according to the opening degree of the accelerator pedal.
Step S3, the powertrain controller 11 obtains a target rotational speed of the driving motor 6 according to the driving demand torque and the MAP of the motor, and controls the driving motor 6 to rotate at the target rotational speed;
in the actual implementation process, the power system controller 11 stores a motor MAP (motor data curve) curve in advance, and after the power system controller 11 acquires the driving demand torque, the corresponding target rotation speed can be searched in the motor MAP curve according to the acquired driving demand torque.
Step S4, the gearbox controller 14 calculates the corresponding gear ratio of the gearbox 7 according to the driving demand torque, the load of the whole vehicle, the reduction ratio of the drive axle and the diameter of the driving wheel;
in step S5, the transmission controller 14 controls the transmission 7 to adjust to a gear matching the gear ratio of the transmission 7.
In the process of implementing the starting gear control method provided by the specific embodiment, firstly, a suspension controller acquires a real-time vehicle load of a vehicle, and transmits the acquired vehicle load to a vehicle control unit 12 and a transmission controller 14; the vehicle control unit 12 calculates a driving demand torque according to the opening degree of an accelerator pedal, and transmits the driving demand torque to the power system controller 11 and the gearbox controller 14, and the power system controller 11 acquires a target rotating speed of the driving motor 6 according to the driving demand torque and a motor MAP curve chart and controls the driving motor 6 to rotate at the target rotating speed; the gearbox controller 14 calculates the corresponding gear ratio of the gearbox 7 according to the driving demand torque, the load of the whole vehicle, the reduction ratio of a drive axle and the diameter of a driving wheel; and controls the gearbox 7 to be adjusted to a gear matching the gear ratio of the gearbox 7.
Compared with the prior art, the starting gear control method provided by the embodiment can acquire the whole vehicle load of the vehicle in real time in the real-time process, and transmit the acquired whole vehicle load to the whole vehicle controller 12 and the gearbox controller 14, so that the gearbox controller 14 can calculate the reasonable transmission gear ratio of the gearbox 7 corresponding to the real-time whole vehicle load according to the driving demand torque, the whole vehicle load, the reduction ratio of the drive axle and the diameter of the driving wheel, and the vehicle can select reasonable starting gears in each stage such as a starting stage and a stable operation stage, thereby improving the driving performance and the performance of the vehicle in the starting stage.
In one embodiment, the starting gear control method comprises the following steps:
step S0, judging whether the vehicle control unit 12, the gearbox controller 14, the power system controller 11 and the suspension controller have faults or not, and if not, entering step S1; if yes, entering a failure mode.
In step S0, when the vehicle is stationary and ready to start or walk, the driver first powers on the entire vehicle key, and after the power on is completed, the entire vehicle controllers complete the power on self-check, and after the self-check of the controllers is completed, the system fault determination is performed, and when there is a fault, the system fault handling mode is entered, and the driver is prompted about the vehicle fault state.
In one embodiment, step S1 includes:
in step S11, the suspension controller acquires each single-axle load of the transaxle 9.
In step S12, the suspension controller calculates a total load value obtained by adding the individual uniaxial loads.
In step S13, the suspension controller calculates the entire vehicle weight from the total load value.
In step S14, the suspension controller transmits the vehicle weight to the vehicle controller 12 and the transmission controller 14.
When the suspension controller includes a plurality of airbags 1 provided to the transaxle 9, step S11 includes:
in step S111, the suspension controller acquires the measured pressure values of all the airbags 1 in the corresponding single axis and the cross-sectional diameters of the corresponding airbags 1.
Step S112, the suspension controller is based on
Calculating load single values corresponding to the air bags 1 in the single shaft; wherein, PijFor the measured pressure value, P, of the jth airbag 1 of the ith axis0Is an atmospheric pressure value, D is the diameter of the cross section of the air bag 1, aijIs the effective coefficient of the section of the jth airbag 1 of the ith axis, fijThe load correction value of the jth airbag 1 of the ith shaft is obtained.
In step S113, the suspension controller adds the load single values corresponding to the airbags 1 in the single axle to obtain a single axle load.
In this embodiment, the vehicle
A plurality of bearing shafts are provided, a plurality of air bags 1 are arranged on a single bearing shaft (single shaft), the number of the shafts is represented by i, and the number of the air bags 1 on the ith single shaft is represented by j; first, according to the formula:
calculating the load single value corresponding to the jth air bag 1 on the ith shaft, adding the load single values corresponding to all the air bags 1 on the single shaft to obtain the single shaft load, and using F as the single shaft loadiIs expressed according to a formula
The uniaxial load can be calculated, wherein FiFor uniaxial loading of the ith axis, n is the number of airbags 1 arranged uniaxially, FijFor the load of the jth airbag 1 of the ith axle, the axle load can be calculated from the axle load ratio of each axle for a vehicle that is not suspended by the completely-carried airbag 1. According to
Wherein G is the weight of the whole vehicle, T is the self weight of the driving wheel, and m is the number of single shafts, so that the load of the whole vehicle can be obtained through calculation.
The following table shows characteristic parameters of the airbag 1 in this embodiment, and of course, other values may also be used, which are determined according to actual situations:
| pressure (bar) | 1 | 3 | 5 | 7 | 8.5 |
| Load (KN) | 4.7 | 14.5 | 24.5 | 34.2 | 41.7 |
In one embodiment, step S4 includes:
in step S41, the transmission controller 14 calculates a required wheel-side drive torque of the rear drive wheels 15 based on the entire vehicle weight.
In step S42, the transmission controller 14 calculates the gear ratio of the transmission 7 according to the driving demand torque, the wheel-side driving torque, the reduction ratio of the transaxle, and the diameter of the driving wheel.
The wheel-side drive torque is calculated as follows:
Fdriving device＝TWheel/RWheelIn which F isDriving deviceIs a wheel-side driving force, TWheelIs the wheel-side drive torque, RWheelIs the radius of the drive wheel 15.
According to the kinetic equation of vehicle motion, the vehicle is started, namely the driving force on the wheel side is equal to the total advancing resistance (including rolling resistance, air resistance and climbing resistance) of the vehicle, and the driving force is balanced, namely:
Fdriving device＝FResistance device＝FRolling resistance+FAir resistance+FSlope resistance；
When the vehicle is taking off, the air resistance is usually negligible, so the total resistance torque can be expressed as:
Fdriving device＝FResistance device＝Mg(frcosα+sinα)
Wherein M is the vehicle mass, g is the acceleration of gravity, frIs the rolling resistance coefficient, and alpha is the road surface gradient.
According to formula FDriving device＝(TDriving motor*iGear box*iDrive axleEta) in which TDrive motor 6For the output of torque of the motor, iGearbox 7For 7-gear speed ratio of the gearbox, iDrive axle 9The transmission ratio of the gearbox 7 can be calculated for the transaxle 9 ratio and η for the overall efficiency of the transmission.
As shown in fig. 3, the device comprises a driving motor 6, a gearbox 7, a transmission shaft 8, a drive axle 9 and a driving wheel 15; the pressure sensor 2 transmits the pressure value to an air suspension 13, and the air suspension 13 is connected with the whole vehicle air pressure sensor 10; in a specific embodiment, whether the air pressure of the whole vehicle is normal or not can be judged through the whole vehicle air pressure sensor 10, the air pressure of the air bag 1 is ensured to be in a normal state, and if the air pressure of the whole vehicle is abnormal, a driver can be reminded through a display screen or a warning sound and the like.
In addition to the starting gear control method described above, the present invention also provides a control system for implementing the starting gear control method disclosed in the above embodiment, the control system including:
the suspension controller is used for acquiring the load of the whole vehicle and transmitting the acquired load of the whole vehicle to the whole vehicle controller 12 and the gearbox controller 14;
the vehicle control unit 12 calculates a driving demand torque according to the opening degree of an accelerator pedal, and transmits the driving demand torque to the power system controller 11 and the transmission controller 14;
the power system controller 11 is used for acquiring a target rotating speed of the driving motor 6 according to the driving demand torque and the motor MAP curve chart and controlling the driving motor 6 to rotate at the target rotating speed;
the gearbox controller 14 is used for calculating the corresponding gear ratio of the gearbox 7 according to the driving demand torque, the load of the whole vehicle, the reduction ratio of the drive axle and the diameter of the driving wheel; and controls the gearbox 7 to be adjusted to a gear matching the gear ratio of the gearbox 7.
The suspension controller includes a plurality of air bags 1 provided to a transaxle 9 and a pressure sensor 2 for measuring a pressure value of the air bags 1.
The suspension controller comprises a displacement sensor arranged on the drive axle 9, and the suspension controller can calculate the load of the whole vehicle according to the displacement information measured by the displacement sensor. Of course, other types of load measuring modules can be arranged, and the load measuring modules are determined according to actual conditions.
Besides the control system, the invention also provides a pure electric commercial vehicle comprising the control system, and other structures of the pure electric commercial vehicle can refer to the prior art and are not described herein again.
As shown in fig. 2, the vehicle body comprises a vehicle girder upper wing surface 3, a vehicle girder lower wing surface 4 and a drive axle connecting piece 5, wherein the air bag 1 is arranged on a drive axle 9.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. Any combination of all embodiments provided by the present invention is within the scope of the present invention, and will not be described herein.
The foregoing has provided a detailed description of the invention. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (9)
1. A starting gear control method is applied to a control system, wherein the control system comprises a vehicle control unit (12), a gearbox controller (14), a power system controller (11) and a suspension controller; the starting gear control method is characterized by comprising the following steps:
the suspension controller acquires a real-time finished vehicle load of a vehicle and transmits the acquired finished vehicle load to the finished vehicle controller (12) and the gearbox controller (14);
the vehicle control unit (12) calculates a driving demand torque according to the opening degree of an accelerator pedal, and transmits the driving demand torque to the power system controller (11) and the gearbox controller (14);
the power system controller (11) acquires a target rotating speed of the driving motor (6) according to the driving demand torque and a motor MAP curve chart, and controls the driving motor (6) to rotate at the target rotating speed;
the gearbox controller (14) calculates the corresponding gear ratio of the gearbox (7) according to the driving demand torque, the whole vehicle load, the reduction ratio of the drive axle and the diameter of the driving wheel;
the gearbox controller (14) controls the gearbox (7) to adjust to a gear matched with the gear ratio of the gearbox (7).
2. The starting gear control method according to claim 1, wherein the suspension controller acquires a real-time vehicle load of a vehicle and transmits the acquired vehicle load to the vehicle controller (12) and the transmission controller (14) before the vehicle load comprises:
judging whether the whole vehicle controller (12), the gearbox controller (14), the power system controller (11) and the suspension controller are in fault, if not, entering the step that the suspension controller acquires the whole vehicle load of the vehicle, and transmitting the acquired whole vehicle load to the whole vehicle controller (12) and the gearbox controller (14); and if the fault occurs, entering a fault mode.
3. The starting gear control method according to claim 1, wherein the suspension controller acquires a real-time vehicle load of a vehicle and transmits the acquired vehicle load to the vehicle controller (12) and the transmission controller (14), and comprises:
the suspension controller acquires each single-shaft load of a drive axle (9);
the suspension controller calculates a total load value added by the single-shaft loads;
the suspension controller calculates the weight of the whole vehicle according to the total load value;
the suspension controller transmits the vehicle control unit weight to the vehicle control unit (12) and the transmission controller (14).
4. A starting gear control method according to claim 3, wherein the suspension controller includes a plurality of airbags (1) provided to the transaxle (9), and the acquiring of each single axle load of the transaxle (9) includes:
the suspension controller acquires the measured pressure values corresponding to all the air bags (1) in the single shaft and the cross section diameters corresponding to the air bags (1);
the suspension controller is based on
Calculating a load single value corresponding to each air bag (1) in the single shaft; wherein, PijIs the measured pressure value of the jth air bag (1) of the ith shaft, P0 is the atmospheric pressure value, D is the cross section diameter of the air bag (1), aijIs the effective coefficient of the section of the jth air bag (1) of the ith shaft, fijA load correction value for the jth airbag (1) of the ith axis;
the suspension controller adds the load single values corresponding to the airbags (1) in the single shaft to obtain the single-shaft load.
5. The starting gear control method according to claim 1, wherein the gearbox controller (14) calculates the corresponding gear ratio of the gearbox (7) according to the driving demand torque, the whole vehicle weight, the reduction ratio of the drive axle and the diameter of the driving wheel, and comprises the following steps:
the gearbox controller (14) calculates the wheel-side driving moment of the rear driving wheel (15) according to the weight of the whole vehicle;
and the gearbox controller (14) calculates the corresponding gear ratio of the gearbox (7) according to the driving demand torque, the wheel side driving torque, the reduction ratio of the drive axle and the diameter of the driving wheel.
6. A control system for implementing the starting gear control method according to any one of claims 1 to 5, characterized by comprising:
the suspension controller is used for acquiring the load of the whole vehicle and transmitting the acquired load of the whole vehicle to the whole vehicle controller (12) and the gearbox controller (14);
the vehicle control unit (12) calculates a driving demand torque according to the opening degree of an accelerator pedal, and transmits the driving demand torque to the power system controller (11) and the gearbox controller (14);
the power system controller (11) acquires a target rotating speed of the driving motor (6) according to the driving demand torque and a motor MAP curve chart, and controls the driving motor (6) to rotate at the target rotating speed;
the gearbox controller (14) calculates the corresponding gear ratio of the gearbox (7) according to the driving demand torque, the whole vehicle load, the reduction ratio of the drive axle and the diameter of the driving wheel; and controlling the gearbox (7) to adjust to a gear matched with the gear ratio of the gearbox (7).
7. The control system according to claim 6, characterized in that the suspension controller comprises a plurality of air bags (1) provided to the transaxle (9) and a pressure sensor (2) for measuring a pressure value of the air bags (1).
8. The control system according to claim 6, characterized in that the suspension controller comprises a displacement sensor arranged on the drive axle (9), and the suspension controller can calculate the load of the whole vehicle according to the displacement information measured by the displacement sensor.
9. A pure electric commercial vehicle, characterized in that it comprises a control system according to any one of claims 6-8.
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| CN202111662189.7A CN114294412A (en) | 2021-12-30 | 2021-12-30 | Pure electric commercial vehicle, control system and starting gear control method |
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| CN202111662189.7A CN114294412A (en) | 2021-12-30 | 2021-12-30 | Pure electric commercial vehicle, control system and starting gear control method |
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| US20080194383A1 (en) * | 2005-09-08 | 2008-08-14 | Volvo Lastvagnar Ab | Method for Adapting an Automated Mechanical Transmission Based on a Measured Pto Load |
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| CN112874321A (en) * | 2021-02-28 | 2021-06-01 | 南京汽车集团有限公司 | Starting system and starting method of new energy cargo vehicle |
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2021
- 2021-12-30 CN CN202111662189.7A patent/CN114294412A/en active Pending
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| US20080194383A1 (en) * | 2005-09-08 | 2008-08-14 | Volvo Lastvagnar Ab | Method for Adapting an Automated Mechanical Transmission Based on a Measured Pto Load |
| CN112248738A (en) * | 2020-10-30 | 2021-01-22 | 东风商用车有限公司 | Load monitoring system and method for commercial vehicle electric control air suspension |
| CN112874321A (en) * | 2021-02-28 | 2021-06-01 | 南京汽车集团有限公司 | Starting system and starting method of new energy cargo vehicle |
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Application publication date: 20220408 |