CN109139891B - Uphill gear shifting strategy for bus - Google Patents
Uphill gear shifting strategy for bus Download PDFInfo
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- CN109139891B CN109139891B CN201710505372.3A CN201710505372A CN109139891B CN 109139891 B CN109139891 B CN 109139891B CN 201710505372 A CN201710505372 A CN 201710505372A CN 109139891 B CN109139891 B CN 109139891B
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- bus
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- output torque
- gear
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
- F16H59/14—Inputs being a function of torque or torque demand
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
- B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
- B60K6/50—Architecture of the driveline characterised by arrangement or kind of transmission units
- B60K6/54—Transmission for changing ratio
- B60K6/547—Transmission for changing ratio the transmission being a stepped gearing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/02—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used
- F16H61/0202—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric
- F16H61/0204—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric for gearshift control, e.g. control functions for performing shifting or generation of shift signal
- F16H61/0213—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric for gearshift control, e.g. control functions for performing shifting or generation of shift signal characterised by the method for generating shift signals
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
- F16H59/14—Inputs being a function of torque or torque demand
- F16H2059/147—Transmission input torque, e.g. measured or estimated engine torque
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H2061/0075—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by a particular control method
- F16H2061/0096—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by a particular control method using a parameter map
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/02—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used
- F16H61/0202—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric
- F16H61/0204—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric for gearshift control, e.g. control functions for performing shifting or generation of shift signal
- F16H61/0213—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric for gearshift control, e.g. control functions for performing shifting or generation of shift signal characterised by the method for generating shift signals
- F16H2061/0216—Calculation or estimation of post shift values for different gear ratios, e.g. by using engine performance tables
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Hybrid Electric Vehicles (AREA)
- Control Of Transmission Device (AREA)
Abstract
The invention discloses a bus uphill gear shifting strategy, which comprises an engine and a transmission, wherein the engine is connected with the input end of the transmission, the output end of the transmission is connected with a rear axle of the bus, the transmission is an automatic transmission, when the bus reaches the rotating speed of entering the next gear when ascending, whether the transmission selects gear shifting is determined according to the output torque of the engine and the transformation ratio of the transmission, whether the output torque of the engine can meet the vehicle requirement is calculated in advance, the vehicle driving requirement can be met, and the problems of insufficient power and high energy consumption caused by frequently switching gears back and forth can be avoided.
Description
Technical Field
The invention relates to a bus control method, in particular to a selection strategy for gear shifting of a transmission in an uphill process of a bus.
Background
Along with the use rate of buses is higher and the workload of bus drivers is also larger and larger, the workload of many buses is in order to alleviate the bus drivers, and along with the application and popularization of new energy buses, especially the use of hybrid buses is more and more, many buses have been equipped with hybrid power systems, the operation noise is low, the fuel consumption is low, however, because the terrain diversity in china, the terrain difference in various places is great, the same or similar control strategy can not completely cover all areas, especially the places with special terrain, like cities with many ramps, the dynamic requirement on the buses is higher, and if the up-ramp and down-ramp are longer, the gears can be switched back and forth due to insufficient dynamic, frequent switching of gears not only can cause insufficient dynamic, but also can waste energy.
Disclosure of Invention
In order to solve the problems, the invention provides a bus uphill gear shifting strategy, wherein the bus comprises an engine and a transmission, the engine is connected with the input end of the transmission, the output end of the transmission is connected with a rear axle of the bus, the transmission is an automatic transmission, when the bus reaches the rotating speed of entering the next gear when ascending, whether the transmission selects gear shifting is determined according to the output torque of the engine and the transformation ratio of the transmission, whether the output torque of the engine can meet the vehicle requirement is calculated in advance, the vehicle driving requirement can be met, and the problems of insufficient power and high energy consumption caused by frequently switching gears back and forth can be solved.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the utility model provides a bus uphill strategy of shifting, the bus includes engine, derailleur, the engine with the derailleur input is connected, the derailleur output with the bus rear axle is connected, the derailleur is automatic transmission, works as when the bus reaches to get into next fender position rotational speed when going uphill, whether the derailleur selects to shift gears according to the output torque of engine with the transformation ratio decision of derailleur, whether the derailleur shifts gears by engine output torque passes through whether the size of the drive power after the derailleur variable speed satisfies bus drive demand decision.
When the acceleration of the bus is smaller than zero when the engine is in the maximum output torque under the current gear, the transmission is downshifted; when the acceleration of the bus is equal to zero when the engine is in the maximum output torque under the current gear, the transmission does not shift gears; when the maximum output torque of the engine at the current gear is larger than zero, whether the maximum output torque of the engine at the next gear can meet the driving requirement of the bus is further considered.
Setting the gear shifting speed of the transmission under a flat road working condition as n0, presetting a speed value n1, n1< n0, calculating a corresponding speed value n2 when the maximum output torque of the engine under the next gear is equal to the output torque on the external characteristic curve of the engine under the current gear, when the speed value of the engine reaches n1, controlling the output torque of the engine to be reduced from the torque T1 corresponding to the speed value n1 on the external characteristic curve to the torque T2 corresponding to n2, linearly reducing the output torque of the engine to T2 from T1, and when the speed is reduced from T1 to T2, if the acceleration of the bus is smaller than or equal to zero, the transmission is not shifted, otherwise, the transmission is shifted.
The bus is a hybrid bus, the bus further comprises a motor, the motor is in power coupling with the engine and drives the bus to run together, the transmission is in the gear shifting process, and the motor runs to supplement power required by the bus running.
Compared with the conventional uphill gear shifting strategy of the bus, the invention has the advantages and beneficial effects that:
1. by using the uphill gear shifting strategy of the bus, whether the driving force under the current gear and the driving force under the switching gear meet the requirements of driving the bus or not is judged according to the maximum output torque of the engine and the variable ratio of the transmission, and whether gear shifting is performed or not and how to perform gear shifting is selected, so that the working efficiency of the engine is improved, and the economy of the whole bus is improved;
2. by using the uphill gear shifting strategy of the bus, the maximum power output capacity of the next gear to be shifted is considered, the engine can meet the driving requirement after gear shifting, the gears are prevented from being shifted back and forth due to insufficient power, the dynamic property is improved, and the service lives of the engine and the transmission are prolonged.
Drawings
FIG. 1 is a schematic structural view of a bus of the present invention;
FIG. 2 is a schematic flow chart of a bus hill-climbing shift strategy of the present invention;
fig. 3 is a graph of external characteristics of the engine in the current gear when the bus ascends a slope.
Detailed Description
The specific implementation method of the invention is as follows:
the existing hybrid buses are more and more accepted by the public, particularly the hybrid buses are widely applied to the buses of various cities, the efficiency of a low-speed engine of the hybrid buses is lower, the motor drives the buses at the moment, the efficiency of the whole buses can be improved, the emission of the buses at low speed can be greatly reduced, even pollutants are not emitted at low speed, the buses are driven at low speed to get in and out, the protection effect on passengers getting on and off the buses is good, however, for the buses with severe running conditions, such as a lot of ramps and a long area, the gears are switched back and forth due to insufficient power after gear shifting, the power performance is insufficient, and the service life of a transmission is influenced.
In order to solve the problems, the invention provides a bus uphill gear shifting strategy, wherein the bus comprises an engine and a transmission, the engine is connected with the input end of the transmission, the output end of the transmission is connected with a rear axle of the bus, the transmission is an automatic transmission, when the bus reaches the rotating speed of entering the next gear when ascending, whether the transmission selects gear shifting is determined according to the output torque of the engine and the variable ratio of the transmission, whether the output torque of the engine can meet the vehicle requirement is calculated in advance, the problems of insufficient power performance and high energy consumption caused by frequently switching gears back and forth can be solved, and the service lives of the engine and the transmission are prolonged.
The concrete method of the uphill gear shifting strategy of the bus is described in detail below with reference to the attached drawings:
fig. 1 is a schematic structural diagram of a bus according to the present invention, in an embodiment of the present invention, the bus is a hybrid bus, the bus may also be a conventional bus and the bus carries an automatic transmission, the hybrid bus includes an engine 1, a transmission 2, an electric motor 3, and a power supply 4, the engine 1, the transmission 2, and the electric motor 3 are sequentially connected, the engine 1 is connected to an input end of the transmission 2, an output end of the transmission 2 is connected to the electric motor 3, an output end of the electric motor is connected to a rear axle of the bus, the power supply 4 is connected to the electric motor 3 to provide electric energy required by the operation of the electric motor 3, the electric motor 3 is dynamically coupled to the engine 1 to drive the bus to operate together, the transmission 2 is an automatic transmission, when the bus reaches a next gear rotation speed when going up a slope, whether the transmission 2 selects gear shifting is determined according to the output torque of the engine 1 and the transformation ratio of the transmission 2, and whether the transmission 2 shifts gears is determined according to whether the driving force of the output torque of the engine 1 after the transmission 2 changes the speed meets the driving requirement of the bus.
Fig. 2 is a schematic diagram of a uphill gear-shifting strategy of a bus according to the present invention, when a vehicle enters an uphill condition, first determining an acceleration a1 of the vehicle when the engine 1 reaches a maximum output torque in a current gear, and if the acceleration a1 of the vehicle when the engine 1 reaches the maximum output torque in the current gear is less than zero, downshifting the transmission 2 to increase a driving force transmitted from the engine 1 to a rear axle; if the acceleration of the vehicle is equal to zero when the engine 1 is in the maximum output torque in the current gear, the transmission 2 does not shift gears and keeps the current gear running; if the acceleration of the vehicle is larger than zero when the engine 1 is in the maximum output torque in the current gear, whether the driving force of the engine 1 in the next gear can meet the driving requirement of the bus is further considered, namely, the acceleration a2 of the vehicle under the maximum output torque of the engine 1 in the next gear is judged, if a2 is smaller than or equal to zero, the transmission 2 is not shifted, and otherwise, the transmission 2 is shifted.
Fig. 3 is an external characteristic curve diagram of the engine in the current gear when the bus ascends the hill according to the present invention, n0 is the shifting speed of the transmission 2 in the current gear under the working condition of the flat road, a speed value n1 is preset, n1< n0, and a speed value n2 corresponding to the maximum output torque of the engine 1 in the next gear being equal to the output torque of the engine 1 in the external characteristic curve in the current gear is calculated, when the speed value of the engine 1 reaches n1, the output torque of the engine 1 is controlled to be decreased from the torque T1 corresponding to the speed value n1 in the external characteristic curve to the torque T2 corresponding to n2, the output torque of the engine 1 can be linearly decreased from T1 to T2, in the process that the speed is decreased from T1 to T2, if the acceleration a2 of the bus is smaller than or equal to zero, the transmission 2 is not shifted, otherwise, the transmission 2 is shifted.
During a gear shift of the transmission 2, the electric motor 3 is operated to supplement the power required for the operation of the bus.
The exemplary embodiments of the present invention should be understood as an example within the scope of the claims of the present invention, and the technical solutions can be implemented by those skilled in the art without limitation.
Claims (6)
1. A bus uphill gear shifting strategy is characterized in that the bus comprises an engine and a transmission, the engine is connected with an input end of the transmission, an output end of the transmission is connected with a rear axle of the bus, the transmission is an automatic transmission, and when the bus reaches a rotating speed of entering a next gear when going uphill, whether the transmission shifts gears is determined by whether the driving force of the engine output torque after the transmission shifts gears meets the driving requirement of the bus;
when the acceleration of the bus is larger than zero when the engine is in the maximum output torque at the current gear, whether the maximum output torque of the engine at the next gear can meet the driving requirement of the bus is further considered;
setting the gear shifting speed of the transmission under the working condition of a flat road as n0, presetting a speed value n1, n1< n0, calculating a corresponding speed value n2 when the maximum output torque of the engine under the next gear is equal to the output torque on the external characteristic curve of the engine under the current gear, when the speed value of the engine reaches n1, controlling the output torque of the engine to be reduced from the torque T1 corresponding to the speed value n1 on the external characteristic curve to the torque T2 corresponding to n2, and in the process that the torque is reduced from T1 to T2, if the acceleration of the bus is smaller than or equal to zero, the transmission is not shifted, otherwise, the transmission is shifted.
2. The bus hill ascent shift strategy according to claim 1, wherein the acceleration of the bus at the maximum output torque of the engine in the current gear is less than zero and the transmission is downshifted.
3. The bus hill ascent shift strategy according to claim 1, wherein the acceleration of the bus at the maximum output torque of the engine in the current gear is equal to zero and the transmission is not shifted.
4. The bus hill ascent shift strategy of claim 1, wherein the engine output torque decreases linearly from T1 to T2.
5. The bus uphill gear shifting strategy according to any one of claims 1-4, wherein the bus is a hybrid bus, and the bus further comprises an electric motor, and the electric motor is in power coupling with the engine and drives the bus to run together.
6. The bus hill-climbing shift strategy according to claim 5 wherein the electric motor operates to supplement the power required for operation of the bus during a shift in the transmission.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710505372.3A CN109139891B (en) | 2017-06-28 | 2017-06-28 | Uphill gear shifting strategy for bus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710505372.3A CN109139891B (en) | 2017-06-28 | 2017-06-28 | Uphill gear shifting strategy for bus |
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| Publication Number | Publication Date |
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| CN109139891A CN109139891A (en) | 2019-01-04 |
| CN109139891B true CN109139891B (en) | 2021-09-03 |
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| CN201710505372.3A Active CN109139891B (en) | 2017-06-28 | 2017-06-28 | Uphill gear shifting strategy for bus |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109896471B (en) * | 2019-04-04 | 2020-09-01 | 杭叉集团股份有限公司 | Automatic gear shifting method and system |
| CN112283339B (en) * | 2020-11-16 | 2022-04-05 | 潍柴动力股份有限公司 | Gear processing method, gear processing device, gear processing equipment and computer readable storage medium |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102425657A (en) * | 2011-10-25 | 2012-04-25 | 北京理工大学 | Combinational control method of gear shift by automatic mechanical transmission (ATM ) system of electric automobile running on upslope |
| DE102013103797A1 (en) * | 2013-04-16 | 2014-10-16 | Audi Ag | Method and device for operating an automatic transmission |
| CN104791475A (en) * | 2015-04-15 | 2015-07-22 | 中国第一汽车股份有限公司 | Slope gear-shifting control method of control system of automatic wet-type double-clutch transmission |
| CN105216602A (en) * | 2014-11-12 | 2016-01-06 | 徐州重型机械有限公司 | A kind of hybrid power application process and system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5088809B2 (en) * | 2006-04-03 | 2012-12-05 | 本田技研工業株式会社 | Sequential automatic transmission |
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2017
- 2017-06-28 CN CN201710505372.3A patent/CN109139891B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102425657A (en) * | 2011-10-25 | 2012-04-25 | 北京理工大学 | Combinational control method of gear shift by automatic mechanical transmission (ATM ) system of electric automobile running on upslope |
| DE102013103797A1 (en) * | 2013-04-16 | 2014-10-16 | Audi Ag | Method and device for operating an automatic transmission |
| CN105216602A (en) * | 2014-11-12 | 2016-01-06 | 徐州重型机械有限公司 | A kind of hybrid power application process and system |
| CN104791475A (en) * | 2015-04-15 | 2015-07-22 | 中国第一汽车股份有限公司 | Slope gear-shifting control method of control system of automatic wet-type double-clutch transmission |
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| CN109139891A (en) | 2019-01-04 |
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