CN111959489B - Control method for P-gear sliding friction cold start of hybrid electric vehicle - Google Patents
Control method for P-gear sliding friction cold start of hybrid electric vehicle Download PDFInfo
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- CN111959489B CN111959489B CN202010783863.6A CN202010783863A CN111959489B CN 111959489 B CN111959489 B CN 111959489B CN 202010783863 A CN202010783863 A CN 202010783863A CN 111959489 B CN111959489 B CN 111959489B
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- 239000003638 chemical reducing agent Substances 0.000 claims description 4
- 238000007599 discharging Methods 0.000 description 5
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W20/00—Control systems specially adapted for hybrid vehicles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
- B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
- B60W10/08—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of electric propulsion units, e.g. motors or generators
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
- B60W30/18—Propelling the vehicle
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/62—Hybrid vehicles
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Automation & Control Theory (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Hybrid Electric Vehicles (AREA)
Abstract
The invention provides a control method for P-gear sliding friction cold start of a hybrid electric vehicle, which controls the rotation speed rise of a large motor and the pre-charging of a second clutch, meanwhile, the angular acceleration of the first planet carrier is controlled not to exceed the maximum limit value of the angular acceleration of the first planet carrier, the second clutch is controlled to slide and drag the engine until the engine ignites and injects oil after the rotating speed of the large motor is increased to A and the pre-charging of the second clutch is finished, when the rotation speed difference between the engine and the large motor is greater than or equal to nDiff and the rotation speed of the engine is greater than or equal to D, controlling the engine to run at the self-idling speed, controlling the target torques of the large motor and the small motor to be 0, controlling the torque of the second clutch by a PID algorithm according to the rotating speed difference value of the engine and the large motor to increase the rotating speed of the large motor, and when the absolute value of the difference between the rotation speeds of the engine and the large motor is less than or equal to nCls and continues for a certain time T, controlling the torque of the second clutch to be rapidly increased until the second clutch is closed. The method is simple and feasible, and effectively solves the problem of the power overrun of the cold-start battery.
Description
Technical Field
The invention relates to the field of automobile control, in particular to a control method for P-gear sliding friction cold start of a hybrid electric vehicle.
Background
With the increasing severity of the environmental pollution problem and the increasingly stringent regulations on oil consumption and emission at home and abroad, the hybrid electric vehicle is an ideal energy-saving and emission-reducing vehicle at a near stage. The gearbox of the double-planet-row four-shaft power split-flow hybrid electric vehicle is coupled through power and has different working modes, so that the engine can work in a high-efficiency area, and the effects of energy conservation and emission reduction are achieved. The starting of the engine of the double-planet-row four-shaft power split-flow type hybrid electric vehicle is started by a large motor in a sliding friction dragging mode under the normal condition. However, the motor needs to consume the power of the battery when starting the engine, and the risk exists in the process of over-power charging and discharging of the battery at low temperature, and the hardware damage is easily caused by the over-power charging and discharging. Therefore, how to avoid the charge/discharge power of the battery from exceeding the limit during the engine starting process to improve the safety performance of the vehicle has become a current research subject.
Disclosure of Invention
The invention aims to provide a control method for P-gear sliding friction cold start of a hybrid electric vehicle, which is simple and feasible and effectively solves the problem that the power of a P-gear sliding friction cold start battery exceeds the limit at low temperature.
The invention is realized by the following scheme:
a control method for P-gear sliding friction cold start of a hybrid electric vehicle is carried out according to the following steps when the vehicle needs to be cold started under the conditions of low-temperature environment and P-gear of the vehicle:
s1: the vehicle control unit obtains a large motor E2 target rotating speed according to a maximum discharge power table look-up allowed by a battery, controls the rotating speed of a large motor E2 to increase by taking the large motor target rotating speed as a target and controls the second clutch C1 to pre-charge oil, controls the angular acceleration of the first planet carrier not to exceed the maximum limit value of the angular acceleration of the first planet carrier obtained according to the maximum discharge power allowed by the battery and the large motor rotating speed table look-up in the process of increasing the rotating speed of the large motor, controls the second clutch C1 to slide and drag the engine until the engine ignites and injects oil after the rotating speed of the large motor E2 rises to a set value A and the pre-charge oil of the second clutch C1 is completed, and executes a step S2 when the rotating speed difference between the engine and the large motor is greater than or equal to a preset value nDiff and the rotating speed of the engine is greater than or equal to a preset value D; in the step S1, since the angular acceleration of the first carrier is limited, the target torques of the large motor E2 and the small motor E1 can be calculated and limited according to the four-axis lever torque balance, so as to prevent the actual charging and discharging power of the battery from exceeding the limit in the cold start phase;
s2: the whole vehicle controller sends an engine target torque value of 0Nm and an engine target idle speed value nSol to an engine controller EMS, the engine controller EMS controls the engine to run in a self-idling mode by taking the engine target idle speed value nSol as a target, meanwhile, the whole vehicle controller controls the target torques of a large motor E2 and a small motor E1 to be 0, controls the torque of a second clutch C1 through a PID algorithm according to the rotating speed difference value of the engine and the large motor E2, enables the rotating speed of the large motor to rise, and executes a step S3 when the absolute value of the rotating speed difference value of the engine and the large motor E2 is less than or equal to a preset value nCls and continues for a certain time T;
s3: the vehicle controller controls the torque of the second clutch C1 to be rapidly increased until the second clutch C1 is closed, and the P-gear friction cold start is completed.
A corresponding table of the maximum discharge power allowed by the battery and the target rotating speed of the large motor is stored in the whole vehicle controller in advance, the corresponding table is obtained through real vehicle calibration optimization, and the target rotating speed of the large motor is obtained through searching of the corresponding table of the maximum discharge power allowed by the battery; and a corresponding table of the maximum discharge power allowed by the battery, the rotating speed of the large motor and the maximum limit value of the angular acceleration of the first planet carrier is stored in the whole vehicle controller in advance, the corresponding table is obtained through real vehicle calibration optimization, and the maximum limit value of the angular acceleration of the first planet carrier is obtained through searching of the corresponding table of the maximum discharge power allowed by the battery and the rotating speed of the large motor.
Further, in the step S1, the target rotation speed of the large motor obtained by looking up the table according to the maximum discharge power allowed by the battery is generally 400 to 600rpm, the preset value a is 400 to 500rpm, the preset value nliff is-20 to 10rpm, and the preset value D is 900 to 1000 rpm.
Further, in the step S2, the target idling value nSol of the engine is 900-1000 rpm, the preset value nCls is 30-50 rpm, the time T is 3-5 cycles, and one cycle is 10 ms.
In the present invention, an environment having a temperature of-10 ℃ or lower is generally regarded as a low-temperature environment.
The control method for P-gear sliding friction cold start of the hybrid electric vehicle is simple and feasible, and effectively solves the problem that the power of the P-gear sliding friction cold start battery exceeds the limit at low temperature. In the step S1, the angular acceleration of the first planet carrier is limited, so that the target torques of the large motor E2 and the small motor E1 are limited, and the actual charging and discharging power of the battery is ensured not to exceed the limit; in step S2, the torques of the small motor E1 and the large motor E2 are controlled to be 0, so that the actual charging and discharging power of the battery is reduced to the minimum, and the battery is effectively protected.
Drawings
FIG. 1 is a schematic representation of a hybrid transmission useful in the present invention;
fig. 2 is a control flowchart of a control method of the P-range coast-to-cold start of the hybrid vehicle in embodiment 1.
Detailed Description
The present invention will be further described with reference to the following examples, but the present invention is not limited to the description of the examples.
The structure of the hybrid transmission used in the present invention is schematically shown in fig. 1, and it comprises engine ICE, torsional damper TSD, small electric machine E1, large electric machine E2, front single planetary row PG1, rear single planetary row PG2, first brake B1, second brake B2, first clutch C0, second clutch C1 and main reducer frd, first planet carrier PC1 of front single planetary row PG1 is connected with second planet carrier R2 of rear single planetary row PG2, first ring gear R1 of front single planetary row PG 6 is connected with second planet carrier PC2 of rear single planetary row PG2 and then meshed with main reducer frfrd, small sun gear S1 of front single planetary row PG1 is connected with rotor shaft of small electric machine E1, large sun gear S1 of rear single planetary row PG1 is connected with rotor shaft of large electric machine E1, one end of first brake B1 of first single planetary row PG1 is connected with first motor PC1 of rotor 1 of front brake B1, second planet carrier 1 of front brake B1 is connected with second motor PC1 of rotor 1, the other ends of the first brake B1 and the second brake B2 are fixed to the transmission case 2, one end of the first clutch C0 is connected to the first carrier PC1 of the front single planetary row PG1, one end of the second clutch C1 is connected to the rotor shaft of the large electric machine E2, the other ends of the first clutch C0 and the second clutch C1 are connected to the input shaft 1, and the input shaft 1 is connected to the engine ICE through the torsional damper TSD.
Example 1
A control method for P-gear sliding friction cold start of a hybrid electric vehicle is disclosed, and a control flow chart is shown in figure 2, and when the vehicle needs to be cold started in a low-temperature environment with the temperature of-18 ℃ and the gear of the vehicle is P gear, the method comprises the following steps:
s1: the vehicle control unit obtains a large motor E2 target rotating speed according to a maximum discharge power table look-up allowed by a battery, the large motor target rotating speed obtained according to the maximum discharge power table look-up allowed by the battery is generally 400-600 rpm, the rotating speed of the large motor E2 is controlled to increase by taking the large motor target rotating speed as a target and the second clutch C1 is pre-filled with oil, in the process of increasing the rotating speed of the large motor, the angular acceleration of the first planet carrier is controlled not to exceed the maximum angular acceleration limit value of the first planet carrier obtained according to the maximum discharge power allowed by the battery and the large motor rotating speed table look-up, after the rotating speed of the large motor E2 is increased to a set value A and the pre-filling of the second clutch C1 is completed, wherein the set value A does not exceed the large motor target rotating speed, the set value is selected in 400-500 rpm, the second clutch C1 is controlled to slide and drag the engine until the engine is injected with oil and ignited, when the rotating speed difference between the engine and the large motor is greater than or equal to a preset value nDiff and the rotating speed of the engine is greater than or equal to a preset value D, taking the value of the preset value nDiff at-20-10 rpm, taking the value of the preset value D at 900-1000 rpm, and executing the step S2;
s2: the method comprises the steps that a vehicle control unit sends an engine target torque value of 0Nm and an engine target idle speed value nSol to an engine controller EMS, the engine target idle speed value nSol takes values in 900-1000 rpm, the engine controller EMS controls the engine to run in a self-idling mode with the engine target idle speed value nSol as a target, meanwhile, the vehicle control unit controls the target torques of a large motor E2 and a small motor E1 to be 0, the torque of a second clutch C1 is controlled through a PID algorithm according to the difference value of the rotating speeds of the engine and the large motor E2, the rotating speed of the large motor is increased, when the absolute value of the rotating speed difference between the engine and the large motor E2 is smaller than or equal to a preset value nCls and lasts for a certain time T, the preset value nCls takes values in 30-50 rpm, the time T takes values in 3-5 periods, one period is 10ms, and a step S3 is executed;
s3: the vehicle controller controls the torque of the second clutch C1 to increase rapidly until the second clutch C1 is closed, and the P gear friction cold start is completed.
Claims (3)
1. A control method for P-gear sliding friction cold start of a hybrid electric vehicle is characterized by comprising the following steps: the hybrid transmission comprises an engine, a torsional damper, a small motor, a large motor, a front single-planet row, a rear single-planet row, a first brake, a second brake, a first clutch, a second clutch and a main reducer, wherein a first planet carrier of the front single-planet row is connected with a second ring gear of the rear single-planet row, a first ring gear of the front single-planet row is connected with a second planet carrier of the rear single-planet row and then meshed with the main reducer, a small sun gear of the front single-planet row is connected with a rotor shaft of the small motor, a large sun gear of the rear single-planet row is connected with a rotor shaft of the large motor, one end of the first brake is connected with the first planet carrier of the front single-planet row, one end of the second brake is connected with the rotor shaft of the small motor, the other ends of the first brake and the second brake are respectively fixed on a transmission shell, one end of the first clutch is connected with the first planet carrier of the front single-planet row, one end of the second clutch is connected with a rotor shaft of the large motor, the other ends of the first clutch and the second clutch are respectively connected with an input shaft, and the input shaft is connected with the engine through a torsional damper; under the conditions of low-temperature environment and P gear of the automobile, when the automobile needs to be started in a cold state, the method comprises the following steps:
s1: the vehicle control unit obtains a target rotating speed of a large motor (E2) according to a table look-up of maximum discharge power allowed by a battery, controls the rotating speed of the large motor (E2) to increase by taking the target rotating speed of the large motor as a target and pre-fills oil in a second clutch (C1), controls the angular acceleration of a first planet carrier not to exceed the maximum limit value of the angular acceleration of the first planet carrier obtained according to the table look-up of the maximum discharge power allowed by the battery and the rotating speed of the large motor in the process of increasing the rotating speed of the large motor, controls the second clutch (C1) to rub and drag the engine until the engine is ignited and injected with oil after the rotating speed of the large motor (E2) increases to a set value A and the pre-filling oil in the second clutch (C1) is completed, and executes a step S2 when the rotating speed difference between the engine and the large motor is greater than or equal to a preset value nDiff and the rotating speed of the engine is greater than or equal to a preset value D;
s2: the whole vehicle controller sends an engine target torque value of 0Nm and an engine target idle speed value nSol to an engine controller, the engine controller controls the engine to run in a self-idling mode by taking the engine target idle speed value nSol as a target, meanwhile, the whole vehicle controller controls the target torques of a large motor (E2) and a small motor (E1) to be 0, controls the torque of a second clutch (C1) through a PID algorithm according to the rotating speed difference value of the engine and the large motor (E2) to enable the rotating speed of the large motor to rise, and executes a step S3 after the absolute value of the rotating speed difference value of the engine and the large motor (E2) is less than or equal to a preset value nCls and continues for a certain time T;
s3: the vehicle control unit controls the torque of the second clutch (C1) to be rapidly increased until the second clutch (C1) is closed, and the P-gear friction cold start is completed.
2. The method for controlling the P-shift cold start of a hybrid vehicle according to claim 1, characterized in that: in the step S1, the target rotating speed of the large motor obtained by looking up a table according to the maximum discharge power allowed by the battery is 400-600 rpm, the preset value A is 400-500 rpm, the preset value nDiff is-20-10 rpm, and the preset value D is 900-1000 rpm.
3. The control method for P-range slipping cold start of a hybrid vehicle according to claim 1 or 2, characterized in that: in the step S2, the target idling value nSol of the engine is 900-1000 rpm, the preset value nCls is 30-50 rpm, the time T is 3-5 periods, and one period is 10 ms.
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| CN202010783863.6A CN111959489B (en) | 2020-08-06 | 2020-08-06 | Control method for P-gear sliding friction cold start of hybrid electric vehicle |
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| CN202010783863.6A CN111959489B (en) | 2020-08-06 | 2020-08-06 | Control method for P-gear sliding friction cold start of hybrid electric vehicle |
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| CN111959489B true CN111959489B (en) | 2022-07-08 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP5709093B2 (en) * | 2011-03-01 | 2015-04-30 | スズキ株式会社 | Engine start control device for hybrid vehicle |
| CN107878447B (en) * | 2017-11-06 | 2019-07-19 | 科力远混合动力技术有限公司 | Sliding rub of hybrid vehicle starts the control method of engine and shift coordination |
| CN110103946B (en) * | 2019-04-18 | 2021-01-05 | 浙江吉利控股集团有限公司 | Hybrid electric vehicle engine starting control method and system |
| CN110091857B (en) * | 2019-04-25 | 2020-08-04 | 科力远混合动力技术有限公司 | Auxiliary gear shifting control method for double-planet-row deep hybrid power automobile brake |
| CN110091856B (en) * | 2019-04-26 | 2020-11-27 | 科力远混合动力技术有限公司 | Method for coordinately controlling sliding friction starting engine and accelerating gear-up of hybrid electric vehicle |
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Effective date of registration: 20220826 Address after: No.16 Gongxin Avenue, industrial park, Yifeng County, Yichun City, Jiangxi Province Patentee after: Jiangxi Dingsheng New Material Technology Co.,Ltd. Address before: 528000 No.1, ChanGang North Road, Nanzhuang Town, Chancheng District, Foshan City, Guangdong Province Patentee before: CORUN HYBRID POWER TECHNOLOGY Co.,Ltd. |