A control method for automatic start-stop and heat preservation of an unmanned diesel engine

Abstract

This invention discloses a control method for automatic start-stop and heat preservation of an unmanned diesel engine, comprising the following steps: S1, the control system judges the conditions for starting the automatic start-stop mode; if the conditions are met, the locomotive is controlled to start executing the automatic start-stop mode; S2, the control system detects technical parameters; if all technical parameters are met, the diesel engine stops or remains stopped; if any technical parameter is not met, the diesel engine automatically starts or remains started until all technical parameters are met, at which point it stops again; S3, the locomotive is exited from the automatic start-stop mode. This invention enables the locomotive to achieve multiple objectives without additional equipment installation, including comprehensive vehicle monitoring, automatic start-stop of the diesel engine, protection against frequent starts, and safety mode control of the locomotive. It meets the requirement for automatic start-stop and heat preservation of the diesel engine under unmanned monitoring, solving the problems caused by the previous requirement of personnel monitoring or the installation of additional heat preservation and heating devices.

Description

Technical Field

[0001] This invention relates to the field of automatic start-stop and heat preservation technology for diesel engines, and in particular to a control method for automatic start-stop and heat preservation of diesel engines without human monitoring. Background Technology

[0002] Maintaining diesel engine temperature in winter has always been a challenge for diesel locomotives. Using antifreeze increases maintenance costs, while using deionized water with additives requires warming the engine in winter to prevent pipes from freezing. Currently, when diesel locomotives are parked outdoors in winter, personnel are assigned to perform periodic warming operations. These personnel manually start the engine, monitor its status, and manually stop it once the required temperature is reached. This method is labor-intensive, requiring constant monitoring. Failure to monitor promptly can lead to locomotive malfunctions due to missing data anomalies, or fuel waste due to failure to shut down the engine after it reaches the required temperature.

[0003] With the increasing use of dual-source locomotives and new energy locomotives, electric heating equipment will be added to the new locomotives to keep the diesel engine oil and water warm. The equipment starts and stops by detecting the diesel and water temperature through a microcomputer, so as to keep the diesel engine warm in winter. This technology has the disadvantages of requiring an additional set of equipment, which is costly, and can only be used when the locomotive is running.

[0004] For example, the Chinese patent application number 202111499081.0, entitled "Dual-source Electric Multiple Unit and its Diesel Engine Temperature Insulation Control Method and System," describes a method applicable to dual-source electric multiple units. The diesel engine is equipped with three different temperature thresholds: 10℃, 25℃, and 60℃. After the multiple unit enters electric mode, a microcomputer detects the diesel engine temperature. If the temperature is below 10℃, the diesel engine starts to heat and maintain the temperature until it exceeds 60℃. If the temperature is above 10℃ but below 25℃, the diesel engine heating device is started via a 600V power supply from the electric locomotive. If the temperature is above 25℃ but below 60℃, neither the diesel engine nor its heating device starts. The crew can determine whether to start the diesel engine earlier to ensure normal operation in areas without power grids, based on the actual operating conditions. The specific control logic diagram is shown below. Figure 1 As shown.

[0005] This method has the following problems:

[0006] (1) This method has limited applicability because it requires powering the heating equipment from other power sources while the diesel engine is off. Therefore, it is only applicable to locomotives with dual or multiple power sources.

[0007] (2) This method is costly and takes up more space in the locomotive, which is not conducive to locomotive design. It also increases the cost of later maintenance because an independent preheating device needs to be installed on the locomotive. The preheating device generally includes at least a heater, a water pump, and related pipelines and valves, which increases the overall vehicle manufacturing cost. At the same time, the preheating equipment occupies locomotive space, which increases the design difficulty. The device also needs to be maintained in the future to prevent leakage and failure, which increases the workload and cost of inspection and maintenance.

[0008] (3) This method has high labor costs. It requires personnel to operate and monitor the locomotive. This function can only be used in the electric mode when the locomotive is in use or stored. Personnel must be on the locomotive to monitor and operate it. It cannot achieve unmanned control and the labor cost is high.

[0009] (4) The diesel engine heat preservation control logic is simple and has few control parameters. It fails to take into account the overall situation of the vehicle. This method only controls the diesel engine water temperature and does not consider the parameters of other important components of the locomotive, such as battery voltage and locomotive total air pressure. It fails to take into account the overall situation of the vehicle and there is a risk in locomotive control.

[0010] For example, the Chinese patent application number 202211413304.1, entitled "Diesel Engine Insulation and Preheating Device and Method for Internal Combustion Locomotives," describes a method that involves installing an insulation and preheating device (including an electric heater and a preheating circulating water pump) on the locomotive. The electric heater is installed inside the locomotive's expansion tank, and one end of the preheating circulating water pump is connected to the tank, while the other end is connected to the pipeline of the diesel engine's cooling circulation system. The locomotive's microcomputer controls the start and stop of the insulation and preheating device by detecting the diesel engine's water temperature, thus maintaining insulation even when the diesel engine is not running. A specific logic diagram is shown below. Figure 2 As shown.

[0011] The key features of this technical solution are as follows: the electric heater is installed inside the expansion tank; the preheating circulating water pump is connected to the highest point of the water system pipeline; the start and stop of the electric heater and the preheating circulating water pump are controlled by the locomotive's microcomputer; and a level switch is installed inside the expansion tank to prevent the electric heater from burning dry. When the water temperature is lower than the set temperature threshold, the microcomputer system starts the electric heater to heat the cooling water in the circulating water tank. Simultaneously, the preheating circulating water pump sends cooling water into the diesel engine cooling circulation system to preheat the diesel engine. When the cooling water temperature reaches the specified temperature threshold, the electric heater and the preheating circulating water pump are shut off to stop heating the circulating water.

[0012] This method has the following problems:

[0013] (1) This method has limited applicability because it requires powering the heating equipment from other power sources while the diesel engine is off. Therefore, it is only applicable to locomotives with dual or multiple power sources.

[0014] (2) This method is costly and takes up more space in the locomotive, which is not conducive to locomotive design. It also increases the cost of later maintenance because an independent preheating device needs to be installed on the locomotive, which increases the overall vehicle manufacturing cost. Although the electric heater is integrated inside the water tank, the preheating circulating water pump is still installed on the locomotive. At the same time, related pipelines, check valves, contactors, circuit breakers, etc. are added, which takes up locomotive space and increases the design difficulty. The device also needs to be maintained in the future to prevent leakage and failure, which increases the workload and cost of inspection and maintenance.

[0015] (3) This method has high labor costs. It requires personnel to operate and monitor the locomotive. It cannot achieve unmanned control and has high labor costs.

[0016] Therefore, developing a control method for automatic start-stop and heat preservation of unmanned diesel engines is of great significance. Summary of the Invention

[0017] The main objective of this invention is to provide a control method for automatic start-stop and heat preservation of an unmanned diesel engine. This method enables the locomotive to achieve multiple objectives, including all-round vehicle monitoring, automatic start-stop of the diesel engine, protection against frequent diesel engine starts, and control of the locomotive's safety mode, without the need for additional equipment. It meets the requirement of automatic start-stop and heat preservation of the diesel engine under unmanned monitoring, solving the following problems caused by the previous requirement for manual monitoring or the installation of additional heat preservation and heating devices:

[0018] (1) Traditional methods of adding extra equipment for insulation are applicable to a limited number of vehicle models;

[0019] (2) Manual temperature control results in high labor costs;

[0020] (3) The addition of extra equipment results in insufficient locomotive space and high design difficulty;

[0021] (4) The additional equipment installation results in high locomotive costs and subsequent maintenance and repair prices;

[0022] (5) The traditional diesel engine automatic start-stop control logic is simple and fails to take into account the overall situation of the vehicle, which poses a risk to the control.

[0023] (6) High fuel consumption is caused by insufficient monitoring during the diesel engine warm-up process.

[0024] According to one aspect of the present invention, a control method for automatic start-stop and heat preservation of an unmanned diesel engine is provided, comprising the following steps:

[0025] S1. The control system performs a judgment on the conditions for starting the automatic start-stop mode. If the conditions are met, the control system performs the operation to enter the automatic start-stop mode on the locomotive and controls the locomotive to start executing the automatic start-stop mode.

[0026] S2. The control system performs technical parameter condition detection. If all technical parameters are met, the diesel engine will stop or remain in a stopped state. If any technical parameter is not met, the diesel engine will start automatically or remain in a started state until all technical parameters are met and then stop again.

[0027] S3. Perform an exit mode operation on the locomotive to control the locomotive to exit the automatic start-stop mode;

[0028] Among them, starting from the start of the self-start-stop mode, if the number of automatic starts of the diesel engine exceeds the preset number in a cycle, the diesel engine will not stop even if all technical parameters are met, until the timing starts again in the next cycle;

[0029] If the ambient temperature is lower than the preset temperature, the diesel engine will automatically increase its speed;

[0030] If the diesel engine fails to start on the first attempt, it will automatically re-enter the starting procedure. After multiple failed attempts, the diesel engine will stop starting, and the locomotive will issue an alarm signal.

[0031] According to an embodiment of the present invention, the conditions for enabling the self-start-stop mode include:

[0032] The locomotive's speed is 0;

[0033] The locomotive applies individual braking;

[0034] The locomotive's control battery voltage is ≥ battery voltage * 0.96;

[0035] The locomotive's main control lever is in the zero position, and the steering lever is in the neutral position;

[0036] The locomotive's control panel is not activated;

[0037] The locomotive has no malfunctions that would affect the starting of the diesel engine;

[0038] The starting power supply voltage of the diesel engine is ≥ power supply voltage * 0.96 and / or the starting air cylinder pressure is ≥ 800 kPa.

[0039] According to one embodiment of the present invention, all technical parameters satisfy the following:

[0040] If the diesel engine is stopped, the locomotive control battery voltage is ≥ battery voltage * 0.96;

[0041] If the diesel engine is in a start-stop state, the locomotive control battery charging current is ≤20A;

[0042] The high-temperature water temperature of the diesel engine is ≥60℃;

[0043] The intercooler temperature of the diesel engine is ≥20℃;

[0044] The pressure of the locomotive's brake cylinder is ≥750 kPa;

[0045] The starting power supply voltage of the diesel engine is ≥ power supply voltage * 0.96 and / or the starting air cylinder pressure is ≥ 800 kPa;

[0046] Ambient temperature ≥ 4℃.

[0047] According to one embodiment of the present invention, exiting the mode operation includes operating one or more of the following: operating the display screen button, operating the brake handle, operating the main handle, operating the direction handle, and activating the control panel.

[0048] According to one embodiment of the present invention, a cycle is 6 to 24 hours.

[0049] According to one embodiment of the present invention, the preset number of times is ≥2 times.

[0050] According to one embodiment of the present invention, an ambient temperature lower than a preset temperature includes an ambient temperature ≤ -15°C.

[0051] According to one embodiment of the present invention, diesel engine stop buttons are provided on both sides of the exterior of the locomotive.

[0052] According to one embodiment of the present invention, multiple times is ≥3 times.

[0053] According to one embodiment of the present invention, the automatic increase of the diesel engine speed includes adjusting to a second gear.

[0054] In a control method for automatic start-stop and heat preservation of an unmanned diesel engine according to an embodiment of the present invention, the locomotive achieves multiple objectives without additional equipment installation, including all-round vehicle monitoring, automatic start-stop of the diesel engine, protection against frequent diesel engine starts, and locomotive safety mode control. This satisfies the requirement for automatic start-stop and heat preservation of the diesel engine under unmanned monitoring, solving the following problems caused by the previous need for personnel monitoring or the installation of additional heat preservation and heating devices:

[0055] 1. Traditional methods of adding extra insulation equipment are applicable to a limited number of vehicle models;

[0056] 2. Manual temperature control results in high labor costs;

[0057] 3. The addition of extra equipment resulted in insufficient locomotive space and increased design complexity;

[0058] 4. The additional equipment installation results in high locomotive costs and subsequent maintenance and repair prices;

[0059] 5. Traditional diesel engine automatic start-stop control logic is simple and fails to take into account the overall situation of the vehicle, thus posing a control risk;

[0060] 6. High fuel consumption is caused by insufficient monitoring during the diesel engine's temperature rise process. Attached Figure Description

[0061] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some implementation examples of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0062] Figure 1 This diagram illustrates the control logic block diagram of the existing dual-source electric multiple unit (EMU) and its internal combustion engine heat preservation control method.

[0063] Figure 2 The control logic block diagram of the existing diesel engine heat preservation and preheating method for internal combustion locomotives is shown.

[0064] Figure 3 A flowchart of a control method for automatic start-stop and heat preservation of an unmanned diesel engine according to an exemplary embodiment of the present invention is shown;

[0065] Figure 4 A control logic block diagram of an automatic start-stop and heat preservation control method for an unmanned diesel engine according to an exemplary embodiment of the present invention is shown. Detailed Implementation

[0066] The following detailed description of the embodiments is intended to exemplify the principles of the present invention, but should not be construed as limiting the scope of the invention. The present invention can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0067] These embodiments are provided to make this disclosure thorough and complete, and to fully express the scope of the invention to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, material composition, numerical expressions, and values ​​set forth in these embodiments should be interpreted as merely exemplary and not as limiting.

[0068] It should be noted that, in the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationships, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0069] It should also be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention depending on the specific circumstances. When a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device.

[0070] All terms used in this invention have the same meaning as understood by one of ordinary skill in the art to which this disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as idealized or highly formalized, unless expressly defined herein.

[0071] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0072] like Figure 3 As shown, the present invention provides a control method for automatic start-stop and heat preservation of an unmanned diesel engine, which includes the following steps:

[0073] S1. The control system performs a judgment on the conditions for starting the automatic start-stop mode. If the conditions are met, the control system performs the operation to enter the automatic start-stop mode on the locomotive and controls the locomotive to start executing the automatic start-stop mode.

[0074] S2. The control system performs technical parameter condition detection. If all technical parameters are met, the diesel engine will stop or remain in a stopped state. If any technical parameter is not met, the diesel engine will start automatically or remain in a started state until all technical parameters are met and then stop again.

[0075] S3. Perform an exit mode operation on the locomotive to control the locomotive to exit the automatic start-stop mode;

[0076] Among them, starting from the start of the self-start-stop mode, if the number of automatic starts of the diesel engine exceeds the preset number in a cycle, the diesel engine will not stop even if all technical parameters are met, until the timing starts again in the next cycle;

[0077] If the ambient temperature is lower than the preset temperature, the diesel engine will automatically increase its speed;

[0078] If the diesel engine fails to start on the first attempt, it will automatically re-enter the starting procedure. After multiple failed attempts, the diesel engine will stop starting, and the locomotive will issue an alarm signal.

[0079] The unmanned diesel engine automatic start-stop and heat preservation control method of the present invention has the advantages of wide applicability to various vehicle models, no need for personnel monitoring, no need for additional equipment, low labor and locomotive costs, and friendliness to locomotive design and maintenance. It can be applied to any microcomputer-controlled internal combustion locomotive and can be used directly on existing locomotives without the need for additional equipment. It solves the shortcomings of existing solutions such as high cost, limited applicability, and high labor costs. At the same time, the comprehensive data monitoring, automatic speed increase at low temperatures, and protection against frequent diesel engine starts ensure the energy saving of the locomotive while also focusing on the safety and service life of the diesel engine.

[0080] After the locomotive is powered on, the automatic start-stop mode is off by default. The locomotive display screen will indicate the status of this mode. To enable it, you must first confirm that the locomotive meets the conditions for enabling the automatic start-stop mode. The display screen will indicate whether each operation has been completed. When the locomotive's microcomputer detects that all operations have been completed, it will display a message indicating that the conditions have been met. Then, you can enable the automatic start-stop mode by operating the button on the display screen. Once the locomotive successfully enters the automatic start-stop mode, the display screen will also indicate the current status of this mode.

[0081] In some specific embodiments, the conditions for enabling the self-start-stop mode include:

[0082] The locomotive's speed is 0;

[0083] The locomotive applies individual braking;

[0084] The locomotive's control battery voltage is ≥ battery voltage * 0.96;

[0085] The locomotive's main control lever is in the zero position, and the steering lever is in the neutral position;

[0086] The locomotive's control panel is not activated;

[0087] The locomotive had no malfunctions affecting the starting of the diesel engine; and

[0088] The starting power supply voltage of the diesel engine is ≥ power supply voltage * 0.96 and / or the starting air cylinder pressure is ≥ 800 kPa.

[0089] After the locomotive enters the automatic start-stop mode, the personnel on board can evacuate the locomotive. The microcomputer detects the technical parameters of the locomotive at this time. When all the following technical parameter conditions are met, the diesel engine stops or remains stopped. When any technical parameter condition is not met, the diesel engine starts automatically or remains started until all conditions are met and then stops again. This cycle repeats.

[0090] Based on the above embodiments, all technical parameters are satisfied, including:

[0091] If the diesel engine is stopped, the locomotive control battery voltage is ≥ battery voltage * 0.96;

[0092] If the diesel engine is in a start-stop state, the locomotive control battery charging current is ≤20A;

[0093] The high-temperature water temperature of the diesel engine is ≥60℃;

[0094] The intercooler temperature of the diesel engine is ≥20℃;

[0095] The pressure of the locomotive's brake cylinder is ≥750 kPa;

[0096] The diesel engine's starting power supply voltage is ≥ power supply voltage * 0.96 and / or the starting air cylinder pressure is ≥ 800 kPa; and

[0097] Ambient temperature ≥ 4℃.

[0098] This invention is mainly aimed at the automatic start-stop and heat preservation control of diesel engines when the locomotive is static (i.e., the locomotive speed is 0). When applied to dual-source locomotives or hybrid locomotives, it is also applicable under the dynamic operation conditions of the locomotive. However, it is necessary to adjust the conditions for entering the automatic start-stop mode and the operation for exiting the mode, such as the locomotive speed is 0, the locomotive main handle is in the zero position and the direction handle is in the neutral position, the control panel is not activated, and the locomotive is applying individual braking.

[0099] Based on the above embodiments, exiting the mode operation includes operating one or more of the following: operating the display screen button, operating the brake handle, operating the main handle, operating the directional handle, and activating the control panel.

[0100] When the locomotive needs to perform other tasks, the driver and crew shall board the locomotive and perform the exit mode operation. The specific method is any one of the following: (1) operate the display screen button to exit the automatic start-stop mode; (2) operate the brake handle; (3) operate the main handle or the direction handle; (4) activate the control panel, the locomotive exits the automatic start-stop mode, and the display screen displays the main interface information.

[0101] Based on the above embodiments, one cycle is 6 to 24 hours. Specifically, one cycle is 12 hours.

[0102] In some specific embodiments, the preset number of times is ≥2.

[0103] Based on the above embodiments, when the ambient temperature is lower than the preset temperature, including ambient temperature ≤ -15℃, the diesel engine automatically increases the speed to the second gear to ensure that the water temperature can continue to rise.

[0104] Based on the above embodiments, in order to allow personnel outside the vehicle to stop the diesel engine in a timely manner when no one is inside the vehicle, diesel engine stop buttons are installed on both sides of the exterior of the locomotive.

[0105] In some specific embodiments, the number of times is ≥3. The diesel engine has a start-failure protection function. When the diesel engine fails to start for the first time, it automatically re-enters the start-up procedure. After a total of 3 start-failures, the diesel engine stops starting, and the locomotive issues an alarm signal.

[0106] Based on the above embodiments, the automatic increase in diesel engine speed includes adjusting to the second gear. When the diesel engine automatically increases its speed and adjusts to the second gear, it means that the fuel combustion is more complete and the power output frequency is faster per unit time, enabling the engine to output greater power.

[0107] This application has the following characteristics:

[0108] (1) The default state of the locomotive's automatic start-stop mode is off. Necessary operations must be performed before entering the mode; otherwise, the mode cannot be entered. Necessary operations include: locomotive speed is 0; locomotive brake is applied individually; locomotive control battery voltage is ≥ battery voltage * 0.96; locomotive main handle is in the zero position and direction handle is in the neutral position; control panel is not activated; locomotive has no faults that affect diesel engine starting; diesel engine starting power supply voltage is ≥ power supply voltage * 0.96 or starting air cylinder pressure is ≥ 800 kPa;

[0109] (2) After the locomotive enters the automatic start-stop mode, the microcomputer detects the main technical parameters of the locomotive. The main technical parameters include: locomotive control battery voltage ≥ battery voltage * 0.96 (stop state); locomotive control battery charging current ≤ 20A (start state); diesel engine high temperature water temperature ≥ 60℃; diesel engine intermediate cooling water temperature ≥ 20℃; locomotive brake air cylinder pressure ≥ 750kpa; diesel engine starting power supply voltage ≥ power supply voltage * 0.96 or starting air cylinder pressure ≥ 800kpa; ambient temperature ≥ 4℃.

[0110] (3) When the microcomputer detects that all the main technical parameters are met, the diesel engine stops or remains in a stopped state; when any condition is not met, the diesel engine starts or remains in a started state.

[0111] (4) It has protection against excessive diesel engine start-up. When the start-stop mode is started, if the number of automatic diesel engine start-ups exceeds 2 within 12 hours, the diesel engine will not stop even if all shutdown conditions are met, until the next 12-hour interval restarts the timing.

[0112] (5) After the diesel engine starts, the speed can be automatically adjusted according to the ambient temperature. If the ambient temperature is too low (below the set threshold of -15℃), the diesel engine will automatically increase the speed to the second gear to ensure that the water temperature can continue to rise.

[0113] (6) In order to enable personnel outside the locomotive to stop the diesel engine in time when no one is inside the locomotive, diesel engine stop buttons are installed on both sides of the exterior of the locomotive;

[0114] (7) The diesel engine has a start failure protection function. When the diesel engine fails to start for the first time, it will automatically re-enter the start program. When a total of 3 start failures occur, the diesel engine will stop starting and the locomotive will issue an alarm signal.

[0115] (8) When the locomotive is operated by any of the following operations, the microcomputer-controlled locomotive will exit the automatic start-stop mode and the display screen will display a status prompt. The specific operations include: ① operating the display screen button to exit the automatic start-stop mode; ② operating the brake handle; ③ operating the main handle or the direction handle; ④ activating the control panel.

[0116] (9) The invention does not require additional electric heating and water circulation equipment. It utilizes the original vehicle's built-in water temperature sensor, battery voltage and current sensor, air cylinder pressure sensor, and ambient temperature sensor.

[0117] For locomotives equipped with power batteries, the necessary operations before entering the mode can include power battery input, and the operation and testing steps related to power batteries, such as power battery charge ≥30%, can be added to the main data of locomotive testing.

[0118] like Figure 4 As shown, the present application will be described below through a specific embodiment.

[0119] (1) The driver and passengers board the vehicle;

[0120] (2) Close all circuit breakers on the locomotive and confirm that the locomotive's microcomputer, display screen and brakes have been started;

[0121] (3) When the locomotive brake is fully applied, place the steering handle in the neutral position and the main handle in the zero position. Check the locomotive parameters through the display screen to confirm that the locomotive speed is 0, control the battery power to exceed 50%, and ensure that there are no faults on the display screen that affect the starting of the diesel engine. The diesel engine starting power supply voltage is ≥ power supply voltage * 0.96 or the starting air cylinder pressure is ≥ 800 kPa. When all the above conditions are met, cancel the activation state of the two end control panels.

[0122] (4) Press the start button for automatic start / stop mode on the display screen or control panel;

[0123] (5) The display screen automatically jumps to the start-stop mode interface and displays the parameters being monitored, allowing the driver and passengers to evacuate the locomotive;

[0124] (6) After the locomotive enters the automatic start-stop mode, the following data will be automatically monitored:

[0125] ① If the diesel engine is stopped, the locomotive control battery voltage is ≥ battery voltage * 0.96;

[0126] ② If the diesel engine is in start-stop mode, the locomotive control battery charging current is ≤20A;

[0127] ③ The diesel engine's high-temperature water temperature is ≥60℃;

[0128] ④ The cooling water temperature in the diesel engine is ≥20℃;

[0129] ⑤ Locomotive brake cylinder pressure ≥ 750 kPa;

[0130] ⑥ The diesel engine starting power supply voltage is ≥ power supply voltage * 0.96 or the starting air cylinder pressure is ≥ 800 kPa;

[0131] ⑦ Ambient temperature ≥ 4℃;

[0132] If all the above data meet the requirements, the locomotive will remain in a stopped state or the diesel engine will be stopped. If any of the above data is not met, the locomotive will remain in a started state or the diesel engine will be started. After this step, the diesel engine will be in one of three states: stopped, failed to start, or started successfully.

[0133] (7) If the diesel engine is stopped, the locomotive microcomputer will continuously monitor the above parameters until the diesel engine starts;

[0134] (8) If the diesel engine fails to start, the microcomputer will automatically attempt to start it a second time. If it fails to start three times in a row, the diesel engine will stop starting, an alarm will sound to indicate that the start failed, and the locomotive will exit the automatic start-stop mode.

[0135] (9) If the diesel engine starts successfully, the microcomputer detects the number of times the diesel engine starts within 12 hours after entering the self-start-stop mode. If it has exceeded three times, the diesel engine will remain running until 12 hours have been reached. If it has not exceeded three times, the microcomputer will continue to detect the above parameters until the diesel engine stops.

[0136] At the same time, the microcomputer detects whether the ambient temperature is lower than the set threshold (-15℃). If it is lower than the temperature, the diesel engine will operate at the second gear speed. If it is higher than the temperature, the diesel engine will automatically coast.

[0137] (10) When the locomotive needs to perform other tasks, the crew member shall board the locomotive and exit the mode operation, which shall be done in any of the following ways:

[0138] ① Operate the buttons on the display screen to exit the automatic start / stop mode;

[0139] ②Operate the brake lever;

[0140] ③ Operate the main handle or the directional handle;

[0141] ④ Activate the control panel, the locomotive exits the automatic start-stop mode, and the display screen shows the main interface information.

[0142] After implementation, this invention has at least the following beneficial effects:

[0143] (1) Traditional methods of adding additional equipment for heat preservation are applicable to a limited number of vehicle models and are only suitable for diesel locomotives that have already installed heating and circulation equipment. This invention can be applied to all microcomputer-controlled diesel locomotives. By utilizing the existing sensors and related equipment of the locomotive, this control method can be added to the microcomputer system to achieve automatic start-stop heat preservation of the diesel engine.

[0144] (2) The traditional manual temperature control method requires a dedicated person to monitor it, which is costly. This invention can achieve the goal of no longer requiring personnel to monitor it after one operation. The locomotive control is fully implemented by a microcomputer, which reduces labor costs.

[0145] (3) The additional installation of insulation equipment occupies the locomotive space, causing problems such as insufficient locomotive space and high design difficulty. This invention uses all the existing sensors and equipment of the locomotive, without adding any additional equipment, and does not affect the locomotive space.

[0146] (4) The additional equipment installation will result in high locomotive procurement costs and subsequent maintenance prices. This invention does not require additional equipment installation and will not increase locomotive procurement and maintenance costs.

[0147] (5) The traditional diesel engine automatic start-stop control logic is simple, only monitoring water temperature, and fails to take into account the overall situation of the vehicle, which poses a risk to the control. In addition to monitoring water temperature, this invention also monitors the locomotive battery capacity, air cylinder pressure, braking status, ambient temperature, diesel engine start-stop times, etc., to comprehensively monitor the locomotive situation and ensure that the locomotive can operate normally when no one is on it.

[0148] (6) Because insufficient monitoring during the diesel engine warming process leads to high fuel consumption, the method of the present invention is completely controlled by a microcomputer. When all conditions are met, the diesel engine can be stopped immediately to save fuel.

[0149] The above are exemplary embodiments disclosed in this invention. The order of the disclosed embodiments is merely for descriptive purposes and does not represent the superiority or inferiority of the embodiments. However, it should be noted that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the disclosed embodiments of this invention (including the claims) is limited to these examples. Various changes and modifications can be made without departing from the scope defined by the claims. The functions, steps, and / or actions of the methods according to the disclosed embodiments described herein do not need to be performed in any particular order. Furthermore, although the elements disclosed in the embodiments of this invention may be described or claimed individually, they may be understood as multiple unless explicitly limited to a singular.

[0150] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples. Within the framework of the invention, technical features of the above embodiments or different embodiments can be combined, and many other variations of the different aspects of the invention as described above exist, which are not provided in the details for the sake of brevity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the protection scope of the invention.

Claims

1. A control method for automatic start-stop and heat preservation of an unmanned diesel engine, characterized in that, Includes the following steps: S1. The control system performs a judgment on the conditions for starting the automatic start-stop mode. If the conditions are met, the control system performs the operation to enter the automatic start-stop mode on the locomotive and controls the locomotive to start executing the automatic start-stop mode. S2. The control system performs technical parameter condition detection. If all the technical parameters are met, the diesel engine stops or remains stopped. If any of the technical parameters are not met, the diesel engine starts automatically or remains started until all the technical parameters are met and then stops again. S3. Perform an exit mode operation on the locomotive to control the locomotive to exit the automatic start-stop mode; Among them, starting from the start of the self-start-stop mode, if the number of automatic starts of the diesel engine exceeds the preset number in one cycle, the diesel engine will not stop even if all the technical parameters are met, until the timing restarts in the next cycle; If the ambient temperature is lower than the preset temperature, the diesel engine will automatically increase its speed; If the diesel engine fails to start on the first attempt, it will automatically re-enter the starting procedure. After multiple failed attempts, the diesel engine will stop starting and the locomotive will issue an alarm signal. The automatic start-stop mode is off by default. Enabling the mode requires a condition check; otherwise, it cannot be entered. The conditions for enabling the automatic start-stop mode include: The locomotive's speed is 0; The locomotive applies individual braking; The control battery voltage of the locomotive is ≥ battery voltage * 0.96; The locomotive's main control handle is in the zero position, and the direction handle is in the neutral position; The locomotive's control panel was not activated; The locomotive has no faults that would affect the starting of the diesel engine; And the starting power supply voltage of the diesel engine is ≥ power supply voltage * 0.96 and / or the starting air cylinder pressure is ≥ 800 kPa; All of the technical parameters must be met, including: If the diesel engine is in a stopped state, the locomotive control battery voltage is ≥ battery voltage * 0.96; If the diesel engine is in a start-stop state, the locomotive control battery charging current is ≤20A; The high-temperature water temperature of the diesel engine is ≥60℃; The intermediate cooling water temperature of the diesel engine is ≥20℃; The brake cylinder pressure of the locomotive is ≥750 kPa; The starting power supply voltage of the diesel engine is ≥ power supply voltage * 0.96 and / or the starting air cylinder pressure is ≥ 800 kPa; And the ambient temperature is ≥4℃.

2. The control method for automatic start-stop and heat preservation of an unmanned diesel engine according to claim 1, characterized in that, The exit mode operation includes operating one or more of the following: operating the display screen button, operating the brake handle, operating the main handle, operating the directional handle, and activating the control panel.

3. The control method for automatic start-stop and heat preservation of an unmanned diesel engine according to claim 1, characterized in that, One cycle is 6 to 24 hours.

4. The control method for automatic start-stop and heat preservation of an unmanned diesel engine according to claim 1, characterized in that, The preset number of times is ≥2 times.

5. The control method for automatic start-stop and heat preservation of an unmanned diesel engine according to claim 1, characterized in that, The ambient temperature being lower than the preset temperature includes an ambient temperature ≤ -15℃.

6. The control method for automatic start-stop and heat preservation of an unmanned diesel engine according to claim 1, characterized in that, The locomotive is equipped with diesel engine stop buttons on both sides of its exterior.

7. The control method for automatic start-stop and heat preservation of an unmanned diesel engine according to claim 1, characterized in that, The term "multiple times" refers to ≥3 times.

8. The control method for automatic start-stop and heat preservation of an unmanned diesel engine according to claim 1, characterized in that, The automatic speed increase of the diesel engine includes adjusting to the second gear.

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