CN115478949B - Safe starting method for hybrid power tractor - Google Patents
Safe starting method for hybrid power tractor Download PDFInfo
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- CN115478949B CN115478949B CN202211274189.4A CN202211274189A CN115478949B CN 115478949 B CN115478949 B CN 115478949B CN 202211274189 A CN202211274189 A CN 202211274189A CN 115478949 B CN115478949 B CN 115478949B
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000001514 detection method Methods 0.000 claims abstract description 26
- 238000009413 insulation Methods 0.000 claims abstract description 25
- 230000003213 activating effect Effects 0.000 claims abstract description 5
- 230000007935 neutral effect Effects 0.000 claims description 18
- 230000001133 acceleration Effects 0.000 claims description 12
- 238000002347 injection Methods 0.000 claims description 11
- 239000007924 injection Substances 0.000 claims description 11
- 230000005540 biological transmission Effects 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 description 20
- 239000000446 fuel Substances 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
- F02D41/062—Introducing corrections for particular operating conditions for engine starting or warming up for starting
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N11/00—Starting of engines by means of electric motors
- F02N11/08—Circuits or control means specially adapted for starting of engines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N11/00—Starting of engines by means of electric motors
- F02N11/08—Circuits or control means specially adapted for starting of engines
- F02N11/087—Details of the switching means in starting circuits, e.g. relays or electronic switches
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N11/00—Starting of engines by means of electric motors
- F02N11/10—Safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N11/00—Starting of engines by means of electric motors
- F02N11/10—Safety devices
- F02N11/106—Safety devices for stopping or interrupting starter actuation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N11/00—Starting of engines by means of electric motors
- F02N11/10—Safety devices
- F02N11/108—Safety devices for diagnosis of the starter or its components
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N15/00—Other power-operated starting apparatus; Component parts, details, or accessories, not provided for in, or of interest apart from groups F02N5/00 - F02N13/00
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P17/00—Testing of ignition installations, e.g. in combination with adjusting; Testing of ignition timing in compression-ignition engines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P5/00—Advancing or retarding ignition; Control therefor
- F02P5/04—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions
- F02P5/145—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions using electrical means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N11/00—Starting of engines by means of electric motors
- F02N11/08—Circuits or control means specially adapted for starting of engines
- F02N2011/0881—Components of the circuit not provided for by previous groups
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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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention provides a safe starting method of a hybrid power tractor, which comprises the following steps: step 1, acquiring a key switch starting instruction; step 2, activating an electrical element of a starting system according to the starting instruction; step 3, judging whether the whole vehicle has a safe starting fault or not; step 4, when the whole vehicle has no safety starting fault, performing insulation detection on the whole vehicle electrical system; step 5, when the insulation detection is qualified, pre-charging the motor controller; step 6, acquiring a key switch starting instruction; step 7, judging whether the whole vehicle meets the safe starting condition according to the starting instruction; and 8, controlling the generator to start the engine when the whole vehicle meets the safe starting condition. Before the hybrid power tractor starts, safety detection is carried out on the aspects of safety start faults, insulation detection, safety start conditions and the like, whether the hybrid power tractor has safety start or not is automatically checked, self-checking is timely carried out, the safety of the starting process of the hybrid power tractor is ensured, and accidents are prevented.
Description
Technical Field
The invention relates to the technical field of tractor starting, in particular to a safe starting method of a hybrid power tractor.
Background
At present, a hybrid power tractor mostly adopts a series hybrid mode, the starting mode is mostly to cancel a starter, and the starter is changed into a mode that an engine is directly dragged by a generator to start, and potential safety hazards exist when the generator drives the engine to start in the prior art.
Disclosure of Invention
The invention aims to solve the technical problem of providing a safe starting method of a hybrid power tractor aiming at the defects of the prior art.
The technical scheme for solving the technical problems is as follows: a method for safely starting a hybrid tractor, comprising: step 1, acquiring a key switch starting instruction; step 2, activating an electric element of a starting system according to the starting instruction; step 3, judging whether the whole vehicle has a safe starting fault or not; step 4, when the whole vehicle has no safety starting fault, performing insulation detection on the whole vehicle electrical system; step 5, when the insulation detection is qualified, pre-charging the motor controller; step 6, acquiring a key switch starting instruction; step 7, judging whether the whole vehicle meets a safe starting condition according to the starting instruction; and 8, controlling the generator to start the engine when the whole vehicle meets the safe starting condition.
The technical scheme of the invention has the beneficial effects that: before the hybrid power tractor starts, safety detection is carried out on the aspects of safety start faults, insulation detection, safety start conditions and the like, whether the hybrid power tractor has safety start or not is automatically checked, self-checking is timely carried out, the safety of the starting process of the hybrid power tractor is ensured, and accidents are prevented.
Further, the step 8 includes: step 81, when the whole vehicle meets a safe starting condition, acquiring a preset ignition rotating speed target value of a generator; step 82, controlling the generator to be combined with the engine in a transmission way, so that the generator drives the engine to rotate, and acquiring a real-time rotating speed value of the generator; step 83, judging whether the real-time rotation speed value is the same as a preset ignition rotation speed target value; and 84, controlling the fuel injection to start the engine when the real-time rotating speed value is the same as the preset ignition rotating speed target value.
The beneficial effects of adopting the further technical scheme are as follows: and detecting the rotating speed of the generator in real time, and controlling oil injection to start the engine when the real-time rotating speed value of the generator is the same as the preset ignition rotating speed target value, so that the starting success rate of the engine is improved, and the stability and the reliability are improved.
Further, the step 82 includes: for a vehicle type with a rigidly connected generator and an engine, controlling the generator to accelerate and rotate according to a first angular acceleration until an ignition rotating speed target value is preset; for a vehicle model with a clutch between the generator and the engine, controlling the generator to accelerate and rotate according to the second angular acceleration until an ignition rotating speed target value is preset; the second angular acceleration is greater than the first angular acceleration.
The beneficial effects of adopting the further technical scheme are as follows: the VCU sends a command to the generator controller to control the generator to start and continuously increase the rotating speed; aiming at the vehicle type with the rigidly connected generator and the engine, in order to protect the mechanical parts from suddenly bearing excessive torque, the generator needs to be controlled to gradually increase the rotating speed to a target value, and when the rotating speed reaches an engine ignition preset value, the engine ECU rapidly controls oil injection and the like. For a vehicle model with a clutch between a generator and an engine, the VCU needs to control the rotation speed of the generator to quickly rise to a target value, so as to protect mechanical components from suddenly bearing excessive torque, then the clutch is combined gradually to drive the engine crankshaft to rotate, and when the rotation speed reaches an engine ignition preset value, the engine ECU quickly controls oil injection.
Further, the step 84 includes: after the engine is started, the generator is controlled to be separated from the engine; and controlling the generator to reduce torque.
The beneficial effects of adopting the further technical scheme are as follows: after the engine is started successfully, the generator is controlled to reduce the torque to 0 rapidly, and the torque output main body is converted into the engine from the generator until the engine is started completely.
Further, the step 3 includes: when the whole vehicle has a safe starting fault, judging whether the safe starting fault affects the starting; when the safe starting fault affects the starting, generating starting prohibition information and safe starting fault information; stopping starting according to the starting prohibition information; and sending the safe starting fault information and the forbidden starting information to the instrument for display.
The beneficial effects of adopting the further technical scheme are as follows: if the whole vehicle network communication state is faulty or the sensor and the switch are in a faulty state, the information sending instrument is displayed, and if the fault affecting the safe starting exists, the starting is temporarily forbidden.
Further, the step 4 includes: when the insulation detection is unqualified, generating starting prohibition information and insulation detection unqualified information; stopping starting according to the starting prohibition information; and sending the insulation detection failure information and the start prohibition information to the instrument for display.
The beneficial effects of adopting the further technical scheme are as follows: if the insulation preset value is not met by the whole vehicle high-voltage electrical system, the BMS can send start prohibition information to the VCU and the instrument, and the instrument can remind a driver of repairing and detecting the high-voltage electrical system.
Further, the step 5 includes: after the motor controller is pre-charged, generating start-permitting information; and sending the permission start information to the meter for display.
The beneficial effects of adopting the further technical scheme are as follows: if the conditions are met, the VCU controls the pre-charging relay to pre-charge all motor controllers, and the high-voltage main relay is combined to prepare for starting the vehicle. After the pre-charging is finished, the VCU can start the information sending instrument to display, and prompt the user to start.
Further, the electric elements of the starting system are a whole vehicle controller, an instrument, an engine controller, a generator controller and a battery pack management controller; the whole vehicle controller, the engine controller, the generator controller and the battery pack management controller are connected through a CAN bus;
the step 2 comprises the following steps:
Acquiring a vehicle residual electric quantity value and a preset electric quantity value;
When the residual electric quantity value is larger than or equal to the preset electric quantity value, performing step 3;
when the residual electric quantity value is smaller than the preset electric quantity value, generating starting prohibition information and residual electric quantity value lower information;
stopping starting according to the starting prohibition information;
and sending the information of low residual electricity value and the information of prohibiting starting to the instrument for displaying.
The beneficial effects of adopting the further technical scheme are as follows: according to the switch instruction, the electric elements of the starting system are activated, so that the related elements of the whole vehicle can start to work, and the electric elements of the starting system are electrified in advance, so that the electric elements of the starting system can work later after being stabilized, the electric elements of the starting system are prevented from being damaged by high current during starting, and the stability and reliability are improved.
Further, the safety starting fault is a whole vehicle network communication state fault, and/or a sensor fault and/or a switch fault.
The beneficial effects of adopting the further technical scheme are as follows: the VCU detects the communication state of the whole vehicle network and states of each sensor and switch, if the communication state of the whole vehicle network is faulty or the sensors and switches are in a faulty state, the VCU displays the information sending instrument, and if there is a fault affecting the starting, the VCU temporarily prohibits the starting.
Further, the safe starting condition is that the hand brake is pulled up, and/or the shuttle shift switch is in a neutral position, and/or the PTO shift switch is in a neutral position, and/or the seat switch is in a closed state.
The beneficial effects of adopting the further technical scheme are as follows: to ensure the start-up safety, the VCU decides whether the start-up is possible at this time according to the state of each sensor or switch associated with the safe start-up, for example: whether the whole car is in a parking state, namely, a hand brake is pulled up; the whole vehicle is in a neutral position, namely the shuttle type gear shifting switch is in the neutral position; the PTO gear is in neutral gear, i.e. the PTO gear switch is in neutral gear; the driver is in the seat, i.e. the seat switch is in the closed state.
Additional aspects of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is one of schematic flowcharts of a method for safely starting a hybrid tractor according to an embodiment of the present invention.
Fig. 2 is a second schematic flow chart of a method for safely starting a hybrid tractor according to an embodiment of the present invention.
Detailed Description
The principles and features of the present invention are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention.
As shown in fig. 1, an embodiment of the present invention provides a method for safely starting a hybrid power tractor, including:
step1, acquiring a key switch starting instruction;
Step 2, activating an electric element of a starting system according to the starting instruction;
step 3, judging whether the whole vehicle has a safe starting fault or not;
step 4, when the whole vehicle has no safety starting fault, performing insulation detection on the whole vehicle electrical system;
step 5, when the insulation detection is qualified, pre-charging the motor controller;
Step 6, acquiring a key switch starting instruction;
step 7, judging whether the whole vehicle meets a safe starting condition according to the starting instruction;
And 8, controlling the generator to start the engine when the whole vehicle meets the safe starting condition.
The technical scheme of the invention has the beneficial effects that: before the hybrid power tractor starts, safety detection is carried out on the aspects of safety start faults, insulation detection, safety start conditions and the like, whether the hybrid power tractor has safety start or not is automatically checked, self-checking is timely carried out, the safety of the starting process of the hybrid power tractor is ensured, and accidents are prevented.
As shown in fig. 2, the method for safely starting the hybrid power tractor specifically comprises the following steps: initially, a key ON; activating VCU, meters, ECU, BMS, etc.; judging whether the whole vehicle has a safety starting related fault or not; if YES (Y, YES), inhibit starting; if not (N, NO), the insulation detection of the whole vehicle high-voltage system is not passed, and starting is forbidden; pre-charging the motor controller through detection; the start switch reaches the start; judging whether the safety starting condition of the whole vehicle is met; if not, prohibiting starting; if yes, enabling the ECU, a motor controller and the like; generator rotation speed control and generator ignition control; and (5) ending.
Further, the step 8 includes:
step 81, when the whole vehicle meets a safe starting condition, acquiring a preset ignition rotating speed target value of a generator;
Step 82, controlling the generator to be combined with the engine in a transmission way, so that the generator drives the engine to rotate, and acquiring a real-time rotating speed value of the generator;
Step 83, judging whether the real-time rotation speed value is the same as a preset ignition rotation speed target value;
And 84, controlling the fuel injection to start the engine when the real-time rotating speed value is the same as the preset ignition rotating speed target value.
The beneficial effects of adopting the further technical scheme are as follows: and detecting the rotating speed of the generator in real time, and controlling oil injection to start the engine when the real-time rotating speed value of the generator is the same as the preset ignition rotating speed target value, so that the starting success rate of the engine is improved, and the stability and the reliability are improved.
Further, the step 82 includes:
for a vehicle type with a rigidly connected generator and an engine, controlling the generator to accelerate and rotate according to a first angular acceleration until an ignition rotating speed target value is preset;
for a vehicle model with a clutch between the generator and the engine, controlling the generator to accelerate and rotate according to the second angular acceleration until an ignition rotating speed target value is preset;
the second angular acceleration is greater than the first angular acceleration.
The beneficial effects of adopting the further technical scheme are as follows: the VCU sends a command to the generator controller to control the generator to start and continuously increase the rotating speed; aiming at the vehicle type with the rigidly connected generator and the engine, in order to protect the mechanical parts from suddenly bearing excessive torque, the generator needs to be controlled to gradually increase the rotating speed to a target value, and when the rotating speed reaches an engine ignition preset value, the engine ECU rapidly controls oil injection and the like. For a vehicle model with a clutch between a generator and an engine, the VCU needs to control the rotation speed of the generator to quickly rise to a target value, so as to protect mechanical components from suddenly bearing excessive torque, then the clutch is combined gradually to drive the engine crankshaft to rotate, and when the rotation speed reaches an engine ignition preset value, the engine ECU quickly controls oil injection.
Further, the step 84 includes:
after the engine is started, the generator is controlled to be separated from the engine;
And controlling the generator to reduce torque.
The beneficial effects of adopting the further technical scheme are as follows: after the engine is started successfully, the generator is controlled to reduce the torque to 0 rapidly, and the torque output main body is converted into the engine from the generator until the engine is started completely.
Further, the step 3 includes:
When the whole vehicle has a safe starting fault, judging whether the safe starting fault affects the starting;
when the safe starting fault affects the starting, generating starting prohibition information and safe starting fault information;
stopping starting according to the starting prohibition information;
and sending the safe starting fault information and the forbidden starting information to the instrument for display.
The beneficial effects of adopting the further technical scheme are as follows: if the whole vehicle network communication state is faulty or the sensor and the switch are in a faulty state, the information sending instrument is displayed, and if the fault affecting the safe starting exists, the starting is temporarily forbidden.
Further, the step 4 includes:
when the insulation detection is unqualified, generating starting prohibition information and insulation detection unqualified information;
stopping starting according to the starting prohibition information;
And sending the insulation detection failure information and the start prohibition information to the instrument for display.
The beneficial effects of adopting the further technical scheme are as follows: if the insulation preset value is not met by the whole vehicle high-voltage electrical system, the BMS can send start prohibition information to the VCU and the instrument, and the instrument can remind a driver of repairing and detecting the high-voltage electrical system.
Further, the step 5 includes:
After the motor controller is pre-charged, generating start-permitting information;
and sending the permission start information to the meter for display.
The beneficial effects of adopting the further technical scheme are as follows: if the conditions are met, the VCU controls the pre-charging relay to pre-charge all motor controllers, and the high-voltage main relay is combined to prepare for starting the vehicle. After the pre-charging is finished, the VCU can start the information sending instrument to display, and prompt the user to start.
Further, the electric elements of the starting system are a whole vehicle controller, an instrument, an engine controller, a generator controller and a battery pack management controller; the whole vehicle controller, the engine controller, the generator controller and the battery pack management controller are connected through a CAN bus;
the step 2 comprises the following steps:
Acquiring a vehicle residual electric quantity value and a preset electric quantity value;
When the residual electric quantity value is larger than or equal to the preset electric quantity value, performing step 3;
when the residual electric quantity value is smaller than the preset electric quantity value, generating starting prohibition information and residual electric quantity value lower information;
stopping starting according to the starting prohibition information;
and sending the information of low residual electricity value and the information of prohibiting starting to the instrument for displaying.
The beneficial effects of adopting the further technical scheme are as follows: according to the switch instruction, the electric elements of the starting system are activated, so that the related elements of the whole vehicle can start to work, and the electric elements of the starting system are electrified in advance, so that the electric elements of the starting system can work later after being stabilized, the electric elements of the starting system are prevented from being damaged by high current during starting, and the stability and reliability are improved.
The remaining capacity is also called the state of charge of the battery, and is represented by the ratio of the remaining dischargeable capacity of the battery after the battery is used for a period of time or is left unused for a long period of time to the capacity of the battery in a fully charged state, and is usually expressed as a percentage. Through detecting the residual electric quantity of the battery of the vehicle, whether the battery can meet the vehicle starting frequency requirement or not is estimated, if so, the vehicle is started normally, and if not, the meter displays information about the fact that the electric quantity is too low and the starting is prohibited, and prompts a user to charge the battery.
Further, the safety starting fault is a whole vehicle network communication state fault, and/or a sensor fault and/or a switch fault.
The beneficial effects of adopting the further technical scheme are as follows: the VCU detects the communication state of the whole vehicle network and states of each sensor and switch, if the communication state of the whole vehicle network is faulty or the sensors and switches are in a faulty state, the VCU displays the information sending instrument, and if there is a fault affecting the starting, the VCU temporarily prohibits the starting.
Further, the safe starting condition is that the hand brake is pulled up, and/or the shuttle shift switch is in a neutral position, and/or the PTO shift switch is in a neutral position, and/or the seat switch is in a closed state.
The beneficial effects of adopting the further technical scheme are as follows: to ensure the start-up safety, the VCU decides whether the start-up is possible at this time according to the state of each sensor or switch associated with the safe start-up, for example: whether the whole car is in a parking state, namely, a hand brake is pulled up; the whole vehicle is in a neutral position, namely the shuttle type gear shifting switch is in the neutral position; the PTO gear is in neutral gear, i.e. the PTO gear switch is in neutral gear; the driver is in the seat, i.e. the seat switch is in the closed state.
The safe starting method for the hybrid power tractor ensures the safety of the starting process of the hybrid power tractor and prevents accidents.
First, when the tractor key switch is turned from off gear (off gear) to on gear (on gear), the tractor whole vehicle controller VCU (Vehicle Control Unit, whole vehicle controller), the meter, the engine controller, the generator controller, the Battery pack management controller BMS (Battery MANAGEMENT SYSTEM), and the like are activated, and the controllers are connected through the CAN bus (Controller Area Network ). At this time, the VCU detects the communication state of the whole vehicle network and the states of each sensor and switch, if the communication state of the whole vehicle network is faulty or the sensors and switches are in a faulty state, the information sending instrument is displayed, and if there is a fault affecting the starting, the starting is temporarily prohibited.
If the VCU does not find related faults affecting starting, the BMS performs insulation detection on the whole vehicle high-voltage electrical system, and if the whole vehicle high-voltage electrical system does not meet an insulation preset value, the BMS sends starting prohibition information to the VCU and the instrument. At this time, the instrument can remind the driver to maintain and detect the high-voltage electric system.
If the conditions are met, the VCU controls the pre-charging relay to pre-charge all motor controllers, and the high-voltage main relay is combined to prepare for starting the vehicle. After the pre-charging is finished, the VCU can start the information sending instrument to display, and prompt the user to start.
When the automobile is required to be started, the key switch reaches the START gear (starting gear) from the ON gear (opening gear), at the moment, the ON gear switch is kept, a starting signal is transmitted to the VCU through a hard wire signal, and in order to ensure the starting safety, the VCU can decide whether the automobile can be started at the moment according to the state of each sensor or switch related to the safety starting at the moment, for example: whether the whole car is in a parking state, namely, a hand brake is pulled up; the whole vehicle is in a neutral position, namely the shuttle type gear shifting switch is in the neutral position; the POWER TAKE-OFF (PTO) gear is in neutral, i.e. the PTO gear switch is in neutral; the driver is in the seat, i.e. the seat switch is in the closed state.
If the above conditions are met, the VCU considers that starting CAN be performed, at this time, the VCU sends a start enabling CAN message to the generator controller and the engine controller ECU (Engine Control Unit, engine controller), the ECU enables the relevant solenoid valve to start after receiving the instruction, and the generator controller enables the relevant components to start according to the message and prepares before starting.
The VCU continuously sends instructions to the generator controller to control the generator to start and continuously increase the rotating speed; for the vehicle type with the rigidly connected generator and engine, in order to protect the mechanical components from suddenly bearing excessive torque, the generator needs to be controlled to gradually increase the rotating speed to a target value, when the rotating speed reaches an engine ignition preset value, the engine ECU rapidly controls oil injection and the like to start the engine, and if the starting is unsuccessful, multiple attempts are made at the moment. For a vehicle model with a clutch K0 between the generator and the engine, the VCU needs to control the rotation speed of the generator to quickly rise to a target value, so as to protect mechanical components from suddenly bearing excessive torque, then gradually combining the clutch K0 to drive the engine crankshaft to rotate, and when the rotation speed reaches an engine ignition preset value, the engine ECU quickly controls oil injection and the like to start the engine. All clutches connected with the generator need to be disconnected before starting.
After the engine is started successfully, the generator is controlled to reduce the torque to 0 rapidly, and the torque output main body is converted into the engine from the generator until the engine is started completely.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (7)
1. A method for safely starting a hybrid tractor, comprising:
step1, acquiring a key switch starting instruction;
Step 2, activating an electric element of a starting system according to the starting instruction;
step 3, judging whether the whole vehicle has a safe starting fault or not;
step 4, when the whole vehicle has no safety starting fault, performing insulation detection on the whole vehicle electrical system;
step 5, when the insulation detection is qualified, pre-charging the motor controller;
Step 6, acquiring a key switch starting instruction;
step 7, judging whether the whole vehicle meets a safe starting condition according to the starting instruction;
Step 8, when the whole vehicle meets the safe starting condition, controlling the generator to start the engine;
The step 8 includes:
step 81, when the whole vehicle meets a safe starting condition, acquiring a preset ignition rotating speed target value of a generator;
Step 82, controlling the generator to be combined with the engine in a transmission way, so that the generator drives the engine to rotate, and acquiring a real-time rotating speed value of the generator;
Step 83, judging whether the real-time rotation speed value is the same as a preset ignition rotation speed target value;
Step 84, controlling oil injection to start the engine when the real-time rotation speed value is the same as the preset ignition rotation speed target value;
The step 82 includes:
for a vehicle type with a rigidly connected generator and an engine, controlling the generator to accelerate and rotate according to a first angular acceleration until an ignition rotating speed target value is preset;
for a vehicle model with a clutch between the generator and the engine, controlling the generator to accelerate and rotate according to the second angular acceleration until an ignition rotating speed target value is preset;
The second angular acceleration is greater than the first angular acceleration;
the electric elements of the starting system are a whole vehicle controller, an instrument, an engine controller, a generator controller and a battery pack management controller; the whole vehicle controller, the engine controller, the generator controller and the battery pack management controller are connected through a CAN bus;
the step 2 comprises the following steps:
Acquiring a vehicle residual electric quantity value and a preset electric quantity value;
When the residual electric quantity value is larger than or equal to the preset electric quantity value, performing step 3;
when the residual electric quantity value is smaller than the preset electric quantity value, generating starting prohibition information and residual electric quantity value lower information;
stopping starting according to the starting prohibition information;
and sending the information of low residual electricity value and the information of prohibiting starting to the instrument for displaying.
2. The method of claim 1, wherein said step 84 comprises:
after the engine is started, the generator is controlled to be separated from the engine;
And controlling the generator to reduce torque.
3. The method for safely starting a hybrid tractor according to claim 1, wherein the step 3 is followed by:
When the whole vehicle has a safe starting fault, judging whether the safe starting fault affects the starting;
when the safe starting fault affects the starting, generating starting prohibition information and safe starting fault information;
stopping starting according to the starting prohibition information;
and sending the safe starting fault information and the forbidden starting information to the instrument for display.
4. The method for safely starting a hybrid tractor according to claim 1, wherein said step 4 comprises, after:
when the insulation detection is unqualified, generating starting prohibition information and insulation detection unqualified information;
stopping starting according to the starting prohibition information;
And sending the insulation detection failure information and the start prohibition information to the instrument for display.
5. The method for safely starting a hybrid tractor according to claim 1, wherein said step 5 is followed by:
After the motor controller is pre-charged, generating start-permitting information;
and sending the permission start information to the meter for display.
6. The method according to claim 1, wherein the safety start fault is a whole vehicle network communication state fault, and/or a sensor fault, and/or a switch fault.
7. A method of safe starting of a hybrid tractor according to claim 1, characterized in that the safe starting condition is that the handbrake is pulled up and/or the shuttle shift switch is in neutral position and/or the PTO shift switch is in neutral position and/or the seat switch is in closed state.
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| KR19980015224A (en) * | 1996-08-20 | 1998-05-25 | 김영귀 | Charging device and charging method of battery for automobile |
| US6316842B1 (en) * | 1999-03-09 | 2001-11-13 | Honda Giken Kogyo Kabushiki Kaisha | Engine control system for hybrid vehicle |
| CN104071153A (en) * | 2013-03-25 | 2014-10-01 | 北汽福田汽车股份有限公司 | Starting control method for hybrid electric vehicle |
| CN111319603A (en) * | 2019-12-27 | 2020-06-23 | 福建中维动力科技股份有限公司 | Engine ignition control system based on high-efficiency hybrid power system |
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| KR19980015224A (en) * | 1996-08-20 | 1998-05-25 | 김영귀 | Charging device and charging method of battery for automobile |
| US6316842B1 (en) * | 1999-03-09 | 2001-11-13 | Honda Giken Kogyo Kabushiki Kaisha | Engine control system for hybrid vehicle |
| CN104071153A (en) * | 2013-03-25 | 2014-10-01 | 北汽福田汽车股份有限公司 | Starting control method for hybrid electric vehicle |
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