Low-temperature starting control circuit and method for electromechanical composite drive special vehicle in extremely cold working condition

Abstract

The application belongs to the technical field of automatic control, and particularly relates to a kind of electromechanical composite transmission special vehicle polar cold condition low temperature starting control circuit and method, through high-voltage battery group and low-voltage battery group staggered peak use, low temperature starting before engine heating system electric power consumption adopts low-voltage battery group to provide, when the capacity or voltage of low-voltage battery group cannot satisfy the power of electric equipment, high-voltage power-on is carried out, after high-voltage power-on, low-voltage power supply conversion device is used to supply power for low-voltage electric equipment, reduce the consumption of battery capacity of high-voltage battery group before low temperature starting, and through setting low temperature starting energy-saving control, less low temperature starting working electric equipment, namely unnecessary, do not work, so as to further reduce the energy consumption of high-voltage battery, provide sufficient energy reserve for starting power generation integrated machine to start vehicle, so as to improve the starting success rate of electromechanical composite transmission special vehicle under polar cold condition.

Description

Technical Field

[0001] This invention belongs to the field of automatic control technology, specifically relating to a low-temperature starting control circuit and method for electromechanical composite transmission special vehicles under extremely cold conditions. Background Technology

[0002] With the rapid development of electromechanical hybrid transmission special vehicles, high-voltage starting has become the main starting method for both electromechanical hybrid transmission and all-electric special vehicles. High-voltage starting under normal temperature conditions offers advantages such as safety and reliability compared to low-voltage starting in traditional vehicles. However, in extremely cold temperatures, insufficient capacity of both the high-voltage and low-voltage battery packs may lead to starting failure. Therefore, for starting control of 900V DC electromechanical hybrid transmission special vehicles under extremely cold conditions, a low-temperature starting circuit and control strategy for special vehicles is needed. Summary of the Invention

[0003] (a) Technical problems to be solved The technical problems to be solved by the present invention are: (1) how to improve the effective utilization rate of electrical energy in low temperature start-up conditions; and (2) how to improve the success rate of start-up in extremely cold conditions.

[0004] (II) Technical Solution To solve the above-mentioned technical problems, the present invention provides a low-temperature starting control circuit for electromechanical composite transmission special vehicles in extremely cold conditions. The low-temperature starting control circuit includes: a high-voltage battery pack, a starter generator, a low-voltage power conversion device, a low-voltage battery pack, a high-voltage power distribution and safety protection device, an electromechanical management controller, a main power distribution box, a low-voltage power distribution device, a vehicle operation panel, a heating pot, an electric motor oil pump, and a diesel pump. The high-voltage battery pack is a power source with energy storage function, used both to output electrical energy and to store electrical energy. The integrated starter-generator is used to realize the functions of power generation and starting; when the engine is working, it is used to convert the mechanical energy of the engine into electrical energy; when the engine starts, it is used to convert electrical energy into mechanical energy to realize the engine starting. The low-voltage power conversion device is used to convert electrical energy from one voltage system to another for output; the low-voltage power conversion device converts DC 900V power to 28V power output. The low-voltage battery pack is a bidirectional energy storage power source, used for both outputting and storing electrical energy. The high-voltage power distribution and safety protection device is used to realize the power distribution management of high-voltage electrical equipment, and also has the functions of high-voltage power grid insulation detection, power-on pre-charging, and power-off discharge. The electromechanical management controller is used to realize the collaborative management and control of electromechanical systems, as well as the comprehensive scheduling of electrical energy; The main distribution box is used to distribute power to the main 28V low-voltage distribution branches; The low-voltage power distribution device is used to realize low-voltage power distribution management and control; The vehicle control panel is used to realize human-machine interaction; to realize the power-on and power-off control of the whole vehicle, and the operation control of chassis electrical equipment; The heating pot is used to heat the engine cooling water under low-temperature starting conditions, as well as to heat other equipment that requires water heating, thereby reducing starting resistance. The electric motor oil pump is used to provide forced oil supply to the engine lubrication system; The diesel pump is used to force fuel supply to the engine's diesel supply system.

[0005] Among them, the high-voltage battery packs on special vehicles use lithium iron phosphate batteries and lithium titanate batteries.

[0006] Furthermore, the present invention also provides a low-temperature starting control method for electromechanical composite transmission special vehicles under extremely cold conditions. The control method is implemented based on the aforementioned control circuit and includes: (1) Energy-saving control strategy; (2) Low-voltage power grid control strategy; (3) High- and low-voltage battery pack switching control strategy; (4) High-voltage power grid control strategy; (5) Heating end control strategy for heating boiler; (6) Start-up control strategy.

[0007] (1) Energy-saving control strategy, as follows: After low-voltage power-on is completed, by pressing the "Low Temperature Energy Saving" button on the passenger control panel, the electromechanical management controller receives an energy-saving control signal and sends control signals to the low-voltage power distribution device and high-voltage power distribution and safety protection device of the chassis and superstructure, shutting off low-voltage and high-voltage electrical equipment that are not involved in low-temperature start-up; by reducing the operation of electrical equipment, energy consumption is reduced; when the electromechanical management controller detects that the generator speed is ≥1400rpm and receives the generator enable signal, the electromechanical management controller automatically deactivates the energy-saving mode; and restores the power distribution of low-voltage and high-voltage electrical equipment.

[0008] The low-voltage and high-voltage electrical equipment includes low-voltage electrical equipment for auxiliary observation, inertial navigation, and communication, as well as high-voltage and low-voltage power supplies for drive motor controllers and fan motor controllers.

[0009] (2) Low-voltage power grid power supply control strategy, as follows: After low-voltage power-on, the electromechanical management controller detects the voltage and SOC of the low-voltage battery pack. When the low-voltage battery pack voltage is ≥24V and the SOC is ≥50%, the power supply for low-voltage electrical equipment is provided by the low-voltage battery pack. The driver's display terminal displays the generator water temperature, high-voltage battery pack voltage and SOC, and low-voltage battery pack voltage and SOC information.

[0010] (3) The high-voltage and low-voltage battery pack switching control strategy is as follows: When the low-voltage battery pack voltage is ≤23V, or the SOC of the low-voltage battery pack is ≤35%, high-voltage power-on is initiated. Once high-voltage power-on is complete, the electromechanical management controller issues the output voltage of the 28V side of the low-voltage power conversion device based on the low-voltage battery pack voltage. The output voltage should match the low-voltage battery pack voltage. After the output voltage of the 28V side of the low-voltage power conversion device is normal, when the charging current of the low-voltage battery pack is ≤5A, the electromechanical management controller issues a command to the low-voltage battery pack to shut off the low-voltage battery main circuit contactor. The electromechanical management controller then detects the status of the auxiliary contacts of the low-voltage battery main circuit contactor. If the main circuit contactor is already shut off, it issues a command to the low-voltage power conversion device to raise the voltage to 28V to supply power to the low-voltage electrical equipment.

[0011] (4) High-voltage power grid power supply control strategy, as follows: After the high voltage is powered on, the electromechanical management controller monitors the voltage and SOC of the high voltage battery pack. When the voltage of the high voltage battery pack is ≥750V or ≥50%, the high voltage battery pack supplies power to the vehicle's electrical equipment. When the voltage of the high voltage battery pack is ≤600V or the SOC of the high voltage battery pack is ≤40%, the high voltage battery pack low voltage alarm signal is issued.

[0012] (5) The heating end control strategy for the heating pot is as follows: The vehicle control panel has a "Heating Pot" button. Pressing the "Heating Pot" button on the vehicle control panel will supply power to the heating pot's power supply branch. After 2 seconds, it will supply power to the heating pot's operating branch, and the heating pot will automatically ignite and start running. When the set heating time is reached, the low-voltage power distribution device will automatically cut off the power to the heating pot's operating branch, but will continue to supply power to the heating pot's operating branch, and the heating pot's water pump will continue to work. When the low-voltage power distribution device receives the third start control signal or the engine speed is ≥1400rpm, the heating pot's water pump motor will stop working.

[0013] (6) Starting control strategy, specifically including: a) Start-up time control Under extremely cold conditions, the starting attempt should not exceed 3 times. During the starting process, if the high-voltage battery pack voltage is ≥700V and the starting time reaches 60s, then the starting attempt should be stopped. If the high-voltage battery pack voltage is ≥650V and the starting time reaches 40s, then the starting attempt should be stopped. If the high-voltage battery pack voltage is ≤600V, starting is prohibited. The high-voltage battery pack should be charged before starting. b) Start-up interval control The interval between the first and second starts, and between the second and third starts, is 180 seconds. c) Electric motor oil pump control strategy Before the first start-up, the starter motor oil pump runs for 60 seconds, then stops. d) Diesel pump control strategy The diesel pump is turned on during the first start-up and stops working after the third start-up or when the engine speed reaches ≥1400 rpm.

[0014] (III) Beneficial Effects Compared with existing technologies, this invention utilizes high-voltage and low-voltage battery packs in a staggered manner. Before low-temperature starting, the engine heating system's power consumption is provided by the low-voltage battery pack. When the capacity or voltage of the low-voltage battery pack cannot meet the power requirements of the electrical equipment, high-voltage power is applied. After high-voltage power is applied, the low-voltage power conversion device supplies power to the low-voltage electrical equipment, reducing the battery capacity consumption of the high-voltage battery pack before low-temperature starting. Furthermore, by setting low-temperature start-up energy-saving controls, fewer electrical devices operate under low-temperature starting conditions, i.e., unnecessary devices do not operate. This further reduces the energy consumption of the high-voltage battery, providing sufficient energy reserves for starting the vehicle using the integrated starter-generator. This improves the starting success rate of electromechanical hybrid transmission special vehicles under extremely cold conditions.

[0015] The technical solutions of this invention specifically involve energy-saving control for electromechanical hybrid transmission special vehicles under extremely cold and low-temperature starting conditions, control of low-voltage grid voltage for electromechanical hybrid transmission special vehicles under extremely cold and low-temperature starting conditions, switching control of high and low voltage battery packs for electromechanical hybrid transmission special vehicles under extremely cold and low-temperature starting conditions, control of high-voltage grid power supply for electromechanical hybrid transmission special vehicles under extremely cold and low-temperature starting conditions, control of starting time for electromechanical hybrid transmission special vehicles under extremely cold and low-temperature starting conditions, and control method of heating pot for electromechanical hybrid transmission special vehicles under extremely cold and low-temperature starting conditions.

[0016] This solution addresses the low-temperature starting characteristics of electromechanical composite special vehicles by matching and controlling the low-temperature starting process with the output capabilities of the high-voltage and low-voltage battery packs, thereby improving the success rate of starting electromechanical composite special vehicles in extremely cold conditions. Attached Figure Description

[0017] Figure 1 Block diagram of low-temperature starting circuit for special vehicles with electromechanical composite transmission Detailed Implementation To make the objectives, contents, and advantages of the present invention clearer, the specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0018] To solve the above-mentioned technical problems, the present invention provides a low-temperature starting control circuit for electromechanical composite transmission special vehicles in extremely cold conditions. The low-temperature starting control circuit includes: a high-voltage battery pack, a starter generator, a low-voltage power conversion device, a low-voltage battery pack, a high-voltage power distribution and safety protection device, an electromechanical management controller, a main power distribution box, a low-voltage power distribution device, a vehicle operation panel, a heating pot, an electric motor oil pump, and a diesel pump. The high-voltage battery pack is a power source with energy storage function, used both to output electrical energy and to store electrical energy. The integrated starter-generator is used to realize the functions of power generation and starting; when the engine is working, it is used to convert the mechanical energy of the engine into electrical energy; when the engine starts, it is used to convert electrical energy into mechanical energy to realize the engine starting. The low-voltage power conversion device is used to convert electrical energy from one voltage system to another for output; the low-voltage power conversion device converts DC 900V power to 28V power output. The low-voltage battery pack is a bidirectional energy storage power source, used for both outputting and storing electrical energy. The high-voltage power distribution and safety protection device is used to realize the power distribution management of high-voltage electrical equipment, and also has the functions of high-voltage power grid insulation detection, power-on pre-charging, and power-off discharge. The electromechanical management controller is used to realize the collaborative management and control of electromechanical systems, as well as the comprehensive scheduling of electrical energy; The main distribution box is used to distribute power to the main 28V low-voltage distribution branches; The low-voltage power distribution device is used to realize low-voltage power distribution management and control; The vehicle control panel is used to realize human-machine interaction; to realize the power-on and power-off control of the whole vehicle, and the operation control of chassis electrical equipment; The heating pot is used to heat the engine cooling water under low-temperature starting conditions, as well as to heat other equipment that requires water heating, thereby reducing starting resistance. The electric motor oil pump is used to provide forced oil supply to the engine lubrication system; The diesel pump is used to force fuel supply to the engine's diesel supply system.

[0019] Among them, the high-voltage battery packs on special vehicles use lithium iron phosphate batteries and lithium titanate batteries.

[0020] Furthermore, the present invention also provides a low-temperature starting control method for electromechanical composite transmission special vehicles under extremely cold conditions. The control method is implemented based on the aforementioned control circuit and includes: (1) Energy-saving control strategy; (2) Low-voltage power grid control strategy; (3) High- and low-voltage battery pack switching control strategy; (4) High-voltage power grid control strategy; (5) Heating end control strategy for heating boiler; (6) Start-up control strategy.

[0021] (1) Energy-saving control strategy, as follows: After low-voltage power-on is completed, by pressing the "Low Temperature Energy Saving" button on the passenger control panel, the electromechanical management controller receives an energy-saving control signal and sends control signals to the low-voltage power distribution device and high-voltage power distribution and safety protection device of the chassis and superstructure, shutting off low-voltage and high-voltage electrical equipment that are not involved in low-temperature start-up; by reducing the operation of electrical equipment, energy consumption is reduced; when the electromechanical management controller detects that the generator speed is ≥1400rpm and receives the generator enable signal, the electromechanical management controller automatically deactivates the energy-saving mode; and restores the power distribution of low-voltage and high-voltage electrical equipment.

[0022] The low-voltage and high-voltage electrical equipment includes low-voltage electrical equipment for auxiliary observation, inertial navigation, and communication, as well as high-voltage and low-voltage power supplies for drive motor controllers and fan motor controllers.

[0023] (2) Low-voltage power grid power supply control strategy, as follows: After low-voltage power-on, the electromechanical management controller detects the voltage and SOC of the low-voltage battery pack. When the low-voltage battery pack voltage is ≥24V and the SOC is ≥50%, the power supply for low-voltage electrical equipment is provided by the low-voltage battery pack. The driver's display terminal displays the generator water temperature, high-voltage battery pack voltage and SOC, and low-voltage battery pack voltage and SOC information.

[0024] (3) The high-voltage and low-voltage battery pack switching control strategy is as follows: When the low-voltage battery pack voltage is ≤23V, or the SOC of the low-voltage battery pack is ≤35%, high-voltage power-on is initiated. Once high-voltage power-on is complete, the electromechanical management controller issues the output voltage of the 28V side of the low-voltage power conversion device based on the low-voltage battery pack voltage. The output voltage should match the low-voltage battery pack voltage. After the output voltage of the 28V side of the low-voltage power conversion device is normal, when the charging current of the low-voltage battery pack is ≤5A, the electromechanical management controller issues a command to the low-voltage battery pack to shut off the low-voltage battery main circuit contactor. The electromechanical management controller then detects the status of the auxiliary contacts of the low-voltage battery main circuit contactor. If the main circuit contactor is already shut off, it issues a command to the low-voltage power conversion device to raise the voltage to 28V to supply power to the low-voltage electrical equipment.

[0025] (4) High-voltage power grid power supply control strategy, as follows: After the high voltage is powered on, the electromechanical management controller monitors the voltage and SOC of the high voltage battery pack. When the voltage of the high voltage battery pack is ≥750V or ≥50%, the high voltage battery pack supplies power to the vehicle's electrical equipment. When the voltage of the high voltage battery pack is ≤600V or the SOC of the high voltage battery pack is ≤40%, the high voltage battery pack low voltage alarm signal is issued.

[0026] (5) The heating end control strategy for the heating pot is as follows: The vehicle control panel has a "Heating Pot" button. Pressing the "Heating Pot" button on the vehicle control panel will supply power to the heating pot's power supply branch. After 2 seconds, it will supply power to the heating pot's operating branch, and the heating pot will automatically ignite and start running. When the set heating time is reached, the low-voltage power distribution device will automatically cut off the power to the heating pot's operating branch, but will continue to supply power to the heating pot's operating branch, and the heating pot's water pump will continue to work. When the low-voltage power distribution device receives the third start control signal or the engine speed is ≥1400rpm, the heating pot's water pump motor will stop working.

[0027] (6) Starting control strategy, specifically including: a) Start-up time control Under extremely cold conditions, the starting attempt should not exceed 3 times. During the starting process, if the high-voltage battery pack voltage is ≥700V and the starting time reaches 60s, then the starting attempt should be stopped. If the high-voltage battery pack voltage is ≥650V and the starting time reaches 40s, then the starting attempt should be stopped. If the high-voltage battery pack voltage is ≤600V, starting is prohibited. The high-voltage battery pack should be charged before starting. b) Start-up interval control The interval between the first and second starts, and between the second and third starts, is 180 seconds. c) Electric motor oil pump control strategy Before the first start-up, the starter motor oil pump runs for 60 seconds, then stops. d) Diesel pump control strategy The diesel pump is turned on during the first start-up and stops working after the third start-up or when the engine speed reaches ≥1400 rpm.

[0028] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A low-temperature starting control circuit for electromechanical composite transmission special vehicles under extremely cold conditions, characterized in that, The low-temperature start-up control circuit includes: a high-voltage battery pack, an integrated starter-generator, a low-voltage power conversion device, a low-voltage battery pack, a high-voltage power distribution and safety protection device, an electromechanical management controller, a main power distribution box, a low-voltage power distribution device, a vehicle operation panel, a heating pot, an electric motor oil pump, and a diesel pump. The high-voltage battery pack is a power source with energy storage function, used both to output electrical energy and to store electrical energy. The integrated starter-generator is used to realize the functions of power generation and starting; when the engine is working, it is used to convert the mechanical energy of the engine into electrical energy; when the engine starts, it is used to convert electrical energy into mechanical energy to realize the engine starting. The low-voltage power conversion device is used to convert electrical energy, converting DC 900V power to 28V power output; The low-voltage battery pack is a bidirectional energy storage power source, used for both outputting and storing electrical energy. The high-voltage power distribution and safety protection device is used to realize the power distribution management of high-voltage electrical equipment, and also has the functions of high-voltage power grid insulation detection, power-on pre-charging, and power-off discharge. The electromechanical management controller is used to realize the collaborative management and control of electromechanical systems, as well as the comprehensive scheduling of electrical energy; The main distribution box is used to distribute power to the main 28V low-voltage distribution branches; The low-voltage power distribution device is used to realize low-voltage power distribution management and control; The vehicle control panel is used to realize human-machine interaction; to realize the power-on and power-off control of the whole vehicle, and the operation control of chassis electrical equipment; The heating pot is used to heat the engine cooling water under low-temperature starting conditions, as well as to heat other equipment that requires water heating, thereby reducing starting resistance. The electric motor oil pump is used to provide forced oil supply to the engine lubrication system; The diesel pump is used to force fuel supply to the engine's diesel supply system.

2. The electromechanical composite transmission special vehicle low-temperature starting control circuit for extremely cold conditions as described in claim 1, characterized in that, The high-voltage battery packs on special vehicles use lithium iron phosphate batteries and lithium titanate batteries.

3. A method for low-temperature starting control of electromechanical composite transmission special vehicles under extremely cold conditions, characterized in that, The control method is implemented based on the control circuit of claim 1, and the control method includes: (1) Energy-saving control strategy; (2) Low-voltage power grid control strategy; (3) High- and low-voltage battery pack switching control strategy; (4) High-voltage power grid control strategy; (5) Heating end control strategy for heating boiler; (6) Start-up control strategy.

4. The method for low-temperature starting control of electromechanical composite transmission special vehicles under extremely cold conditions as described in claim 3, characterized in that, (1) Energy-saving control strategy, as follows: After low-voltage power-on is completed, by pressing the "Low Temperature Energy Saving" button on the passenger control panel, the electromechanical management controller receives an energy-saving control signal and sends control signals to the low-voltage power distribution device and high-voltage power distribution and safety protection device of the chassis and superstructure, shutting off low-voltage and high-voltage electrical equipment that are not involved in low-temperature start-up; by reducing the operation of electrical equipment, energy consumption is reduced; when the electromechanical management controller detects that the generator speed is ≥1400rpm and receives the generator enable signal, the electromechanical management controller automatically deactivates the energy-saving mode; and restores the power distribution of low-voltage and high-voltage electrical equipment.

5. The method for low-temperature starting control of electromechanical composite transmission special vehicles under extremely cold conditions as described in claim 4, characterized in that, The low-voltage and high-voltage electrical equipment includes low-voltage electrical equipment for auxiliary observation, inertial navigation, and communication, as well as high-voltage and low-voltage power supplies for drive motor controllers and fan motor controllers.

6. The method for low-temperature starting control of electromechanical composite transmission special vehicles under extremely cold conditions as described in claim 5, characterized in that, (2) Low-voltage power grid power supply control strategy, as follows: After low-voltage power-on, the electromechanical management controller detects the voltage and SOC of the low-voltage battery pack. When the low-voltage battery pack voltage is ≥24V and the SOC is ≥50%, the power supply for low-voltage electrical equipment is provided by the low-voltage battery pack. The driver's display terminal displays the generator water temperature, high-voltage battery pack voltage and SOC, and low-voltage battery pack voltage and SOC information.

7. The method for low-temperature starting control of electromechanical composite transmission special vehicles under extremely cold conditions as described in claim 6, characterized in that, (3) The high-voltage and low-voltage battery pack switching control strategy is as follows: When the low-voltage battery pack voltage is ≤23V, or the SOC of the low-voltage battery pack is ≤35%, high-voltage power-on is initiated. Once high-voltage power-on is complete, the electromechanical management controller issues the output voltage of the 28V side of the low-voltage power conversion device based on the low-voltage battery pack voltage. The output voltage should match the low-voltage battery pack voltage. After the output voltage of the 28V side of the low-voltage power conversion device is normal, when the charging current of the low-voltage battery pack is ≤5A, the electromechanical management controller issues a command to the low-voltage battery pack to shut off the low-voltage battery main circuit contactor. The electromechanical management controller then detects the status of the auxiliary contacts of the low-voltage battery main circuit contactor. If the main circuit contactor is already shut off, it issues a command to the low-voltage power conversion device to raise the voltage to 28V to supply power to the low-voltage electrical equipment.

8. The method for low-temperature starting control of electromechanical composite transmission special vehicles under extremely cold conditions as described in claim 7, characterized in that, (4) High-voltage power grid power supply control strategy, as follows: After the high voltage is powered on, the electromechanical management controller monitors the voltage and SOC of the high voltage battery pack. When the voltage of the high voltage battery pack is ≥750V or ≥50%, the high voltage battery pack supplies power to the vehicle's electrical equipment. When the voltage of the high voltage battery pack is ≤600V or the SOC of the high voltage battery pack is ≤40%, the high voltage battery pack low voltage alarm signal is issued.

9. The electromechanical composite transmission special vehicle low-temperature starting control method under extremely cold conditions as described in claim 8, characterized in that, (5) The heating end control strategy for the heating pot is as follows: The vehicle control panel has a "Heating Pot" button. Pressing the "Heating Pot" button on the vehicle control panel will supply power to the heating pot's power supply branch. After 2 seconds, it will supply power to the heating pot's operating branch, and the heating pot will automatically ignite and start running. When the set heating time is reached, the low-voltage power distribution device will automatically cut off the power to the heating pot's operating branch, but will continue to supply power to the heating pot's operating branch, and the heating pot's water pump will continue to work. When the low-voltage power distribution device receives the third start control signal or the engine speed is ≥1400rpm, the heating pot's water pump motor will stop working.

10. The method for low-temperature starting control of electromechanical composite transmission special vehicles under extremely cold conditions as described in claim 9, characterized in that, (6) Starting control strategy, specifically including: a) Start-up time control Under extremely cold conditions, the starting attempt should not exceed 3 times. During the starting process, if the high-voltage battery pack voltage is ≥700V and the starting time reaches 60s, then the starting attempt should be stopped. If the high-voltage battery pack voltage is ≥650V and the starting time reaches 40s, then the starting attempt should be stopped. If the high-voltage battery pack voltage is ≤600V, starting is prohibited. The high-voltage battery pack should be charged before starting. b) Start-up interval control The interval between the first and second starts, and between the second and third starts, is 180 seconds. c) Electric motor oil pump control strategy Before the first start-up, the starter motor oil pump runs for 60 seconds, then stops. d) Diesel pump control strategy The diesel pump is turned on during the first start-up and stops working after the third start-up or when the engine speed reaches ≥1400 rpm.

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