Low-temperature cold start control method, device and equipment and vehicle
By selecting the appropriate starting strategy according to the vehicle hardware configuration information under low temperature conditions and utilizing the combination of a generator and a starter motor, the problem of engine starting failure at low temperatures is solved, and the success rate and smoothness of engine starting are improved.
Patent Information
- Application Number
- CN202410292793.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-14
- Publication Date
- 2025-09-16
AI Technical Summary
Under low temperature conditions, the low-temperature discharge power of the high-voltage battery is weak, which increases the risk of engine start failure or even prevents normal start.
By obtaining vehicle hardware configuration information under low temperature conditions and selecting a suitable starting strategy, the engine can be started multiple times using the generator (the first method), the engine can be started using the starter motor alone (the second method), or the engine can be started using the generator and the starter motor simultaneously (the third method) to reduce starting resistance and increase success rate.
Under low temperature conditions, the success rate of engine starting is improved, the starting resistance is reduced, and the engine can be ensured to start smoothly.
Smart Images
Figure CN120650095A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of low-temperature cold starting, and more particularly to a low-temperature cold starting control method, device, equipment and vehicle. Background Art
[0002] When starting the engine under the hybrid architecture, the GM (Genarator Motor) is used to drag the engine to make the engine speed reach the target speed (such as 1200rpm), and then the target engine speed is closed-loop controlled. After the HCU (Hybrid Control Unit) enables the EMS (Engine Management System) to perform fuel injection and ignition, the engine begins to output torque. The GM uses the target power generation power as input to execute negative torque generation while closed-loop controlling the target idle speed.
[0003] When the GM is turning its engine, it uses a high-voltage power supply. The high-voltage battery in this power supply is significantly affected by temperature. At low temperatures, the high-voltage battery's discharge power is weak, and it cannot provide sufficient power to the GM. This increases the risk of an engine start failure, or even prevents the engine from starting properly. Summary of the Invention
[0004] In view of this, the present invention provides a low-temperature cold start control method, device, equipment and vehicle to solve the problem that when the temperature is low, the high-voltage battery has weak discharge power due to low temperature, which increases the risk of unsuccessful engine start-up and even causes the engine to be unable to start normally.
[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:
[0006] A low-temperature cold start control method, comprising:
[0007] When the current temperature meets the preset low temperature range, obtain the vehicle hardware configuration information;
[0008] determining, from the starting strategy, a target starting strategy corresponding to the vehicle hardware configuration information; wherein, in the starting strategy, if the vehicle hardware configuration information includes only a generator, a first method of using the generator to start the engine multiple times is adopted; and if the vehicle hardware configuration information includes both the generator and a starter motor, based on power supply attribute information corresponding to the starter motor, a second method of using the starter motor alone to start the engine is adopted, or a third method of using the starter motor and the generator to start the engine simultaneously is adopted;
[0009] An engine start control operation is performed using the target start strategy.
[0010] Optionally, determining a target startup strategy corresponding to the vehicle hardware configuration information from the startup strategy includes:
[0011] determining whether the vehicle hardware configuration information includes a starter motor and a generator;
[0012] If only the generator is included, the first mode is determined as the target startup strategy;
[0013] If both the starter motor and the generator are included, obtaining power supply attribute information corresponding to the starter motor;
[0014] Determining whether the power supply attribute information meets the preset independent startup conditions;
[0015] If satisfied, determining the second method as the target startup strategy;
[0016] If not, the third method is determined as the target startup strategy.
[0017] Optionally, when the target startup strategy adopts the first mode, performing the engine startup control operation using the target startup strategy includes:
[0018] According to a first preset speed, controlling the generator to drive the engine to rotate multiple times;
[0019] controlling the generator to continuously drive the engine to rotate according to a second preset speed;
[0020] When the rotation speed of the engine reaches the second preset rotation speed, the engine is controlled to inject fuel and ignite; the first preset rotation speed is less than the second preset rotation speed.
[0021] Optionally, controlling the generator to drive the engine to rotate multiple times according to the first preset speed includes:
[0022] controlling the generator to drive the engine to rotate at a first preset speed, and when the speed of the engine reaches the first preset speed, controlling the current driving state to maintain a first preset time period;
[0023] After the first preset time period ends, within a second preset time period, controlling the generator to stop driving the engine to rotate;
[0024] After the second preset time period ends, the process returns to the step of controlling the generator to drive the engine to rotate at the first preset speed, and the process is executed sequentially until the number of cycles reaches the preset number.
[0025] Optionally, when the target startup strategy adopts the second mode, performing the engine startup control operation using the target startup strategy includes:
[0026] The starter motor is controlled to drive the engine to rotate, and when the rotation speed of the engine reaches a second preset rotation speed, the engine is controlled to inject fuel and ignite.
[0027] Optionally, when the target startup strategy adopts the third mode, performing the engine startup control operation using the target startup strategy includes:
[0028] The starter motor and the generator are controlled to simultaneously drive the engine to rotate, and when the rotation speed of the engine reaches a second preset rotation speed, the engine is controlled to inject fuel and ignite.
[0029] Optionally, when the current temperature does not meet the preset low temperature range, the method further includes:
[0030] The generator is controlled to drive the engine to rotate, and when the rotation speed of the engine reaches a second preset rotation speed, the engine is controlled to inject fuel and ignite.
[0031] A low-temperature cold start control device, comprising:
[0032] An information acquisition module, used to obtain vehicle hardware configuration information when the current temperature meets a preset low temperature range;
[0033] a strategy determination module for determining, from a startup strategy, a target startup strategy corresponding to the vehicle hardware configuration information; wherein, in the startup strategy, if the vehicle hardware configuration information includes only a generator, a first method of using the generator to start the engine multiple times is adopted; and, if the vehicle hardware configuration information includes both the generator and a starter motor, based on power supply attribute information corresponding to the starter motor, a second method of using the starter motor alone to start the engine is adopted, or a third method of using the starter motor and the generator to start the engine simultaneously is adopted;
[0034] A start control module is configured to perform an engine start control operation using the target start strategy.
[0035] A low-temperature cold start control device, comprising: a memory and a processor;
[0036] Wherein, the memory is used to store programs;
[0037] The processor calls a program and is used to execute the above-mentioned low-temperature cold start control method.
[0038] A vehicle includes the low-temperature cold start control device described above, and further includes a starter motor and a generator, wherein the starter motor and the generator drive the engine to rotate based on the control of the low-temperature cold start control device.
[0039] Compared with the prior art, the present invention has the following beneficial effects:
[0040] The present invention provides a low-temperature cold start control method, device, equipment, and vehicle. When the temperature is low, if the vehicle hardware configuration information includes only a generator, a first method of using the generator to start the engine multiple times can be used to reduce engine starting resistance, improve starting smoothness, and thereby increase the probability of successful engine starting. In addition, if the vehicle hardware configuration information includes both the generator and a starter motor, based on the power supply attribute information corresponding to the starter motor, a second method of using the starter motor alone to start the engine or a third method of using the starter motor and generator to start the engine simultaneously can be used. When the high-voltage battery powering the generator has low discharge power due to low temperature, the starter motor can be used to assist in engine starting or to start the engine alone, rather than using the generator. This can avoid starting failures due to the high-voltage power supply, thereby increasing the probability of successful engine starting. BRIEF DESCRIPTION OF THE DRAWINGS
[0041] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.
[0042] Figure 1 A schematic structural diagram of a powertrain provided by an embodiment of the present invention;
[0043] Figure 2 A schematic structural diagram of another powertrain provided by an embodiment of the present invention;
[0044] Figure 3 A flowchart of a low-temperature cold start control method provided by an embodiment of the present invention;
[0045] Figure 4 A flowchart of a method for determining a startup strategy provided by an embodiment of the present invention;
[0046] Figure 5 A flowchart of another low-temperature cold start control method provided by an embodiment of the present invention;
[0047] Figure 6A flow chart of another low-temperature cold start control method provided by an embodiment of the present invention;
[0048] Figure 7 A schematic structural diagram of a low-temperature cold start control device provided in an embodiment of the present invention. DETAILED DESCRIPTION
[0049] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0050] Under the existing hybrid architecture, there are currently two ways to implement the DHT powertrain. One is with a 12v starter motor. Its structural diagram is shown in the figure below. Figure 1 Another type of starting motor without 12V (referred to as starting motor or starter), its structural diagram is as follows Figure 2 shown.
[0051] Figure 1 In the diagram, ICE (Internal combustion engine) is the engine, GM (Genarator Motor) is the generator, DCDC (DC to DC converter) is the DC-DC converter, starter is the abbreviation of the starter motor, C1 is the clutch, G1\G2\G3 are gears, S1 is the synchronizer, TM is the drive motor, and the connection structure of each component is as follows: Figure 1 shown.
[0052] In practice, after the ICE is started, the GM rotates, charging the high-voltage power supply. The HCU controls the DC-DC converter, allowing the high-voltage power supply to charge the 12V power supply, which then powers the starter motor.
[0053] When starting the engine, the high-voltage power supply supplies power to the GM, which uses the GM to drag the engine so that the engine speed reaches the target speed (such as 1000rpm or 1200rpm). The target engine speed is then closed-loop controlled. After the HCU (Hybrid Control Unit) enables the EMS (Engine Management System) to perform fuel injection and ignition, the engine begins to output torque. The GM uses the target power generation power as input to execute negative torque generation while closed-loop controlling the target idle speed.
[0054] In detail, the HCU sets the start type (HCU_EngStartType) to GM start. At this time, the HCU controls the GM to normally drag the engine to start. First, open-loop control is performed, the generator torque (GM_TRQ) begins to increase, and the engine (Engspd) speed begins to increase. When the engine speed reaches the target speed, the HCU requests the engine to spray fuel and ignite. Based on the target speed, the GM closed-loop control starts, the engine starts to spray fuel and ignite, and the engine torque (EngTrq) begins to increase. The torque establishment process is still controlled by the GM closed-loop speed until the engine torque is normally established, and then the engine and GM torque are controlled based on the target power generation power.
[0055] The entire GM engine startup process is powered by a high-voltage power supply, and the high-voltage battery within this power supply is significantly affected by temperature. At low temperatures (water temperature below -25°C), the high-voltage battery's weak discharge power makes it unable to provide sufficient energy to the GM, increasing the risk of an engine start failure or even a complete failure. Furthermore, the increased resistance of various components at low temperatures further increases the risk of a startup failure.
[0056] Similarly, if a 12V starter motor is not available, the GM engine will use its normal drag start method. However, this method increases the risk of a failed engine start at low temperatures, or even prevents the engine from starting properly. Furthermore, the resistance of various components at low temperatures is high, further increasing the risk of a failed start.
[0057] In order to solve the above technical problems, the inventors found through research that Figure 1 Since the starter motor can also start the engine, when the temperature is low and the 12V power supply has sufficient power, the engine can be started using only the starter motor. If the 12V power supply has less power, in order to prevent the 12V power supply from being affected by the temperature when the temperature is low, the generator and starter motor can be used to start the engine simultaneously, avoiding the situation where only one device is used to start the engine, resulting in insufficient energy from the power supply.
[0058] against Figure 2 Since the engine can only be started using the generator, an improved starting method is needed. The inventors discovered that if the engine is started using the generator for a period of time, then stopped for a period of time, started again, stopped again, started again, stopped again, etc., this method can be used to pre-start the engine several times before starting the engine normally using the normal continuous engine start method. This method can establish lubrication, reduce starting resistance, improve starting smoothness, and thus increase the probability of a successful start.
[0059] Therefore, the present invention provides a low-temperature cold start control method, device, equipment, and vehicle. When the temperature is low, if the vehicle hardware configuration information only includes a generator, a first method of using the generator to start the engine multiple times can be used to reduce engine starting resistance, improve starting smoothness, and thereby increase the probability of successful engine starting. In addition, if the vehicle hardware configuration information includes both the generator and the starter motor, based on the power supply attribute information corresponding to the starter motor, a second method of using the starter motor alone to start the engine or a third method of using the starter motor and the generator to start the engine simultaneously can be used. When the high-voltage battery powering the generator has low discharge power due to low temperature, the generator is no longer used or is not used only to start the engine. Instead, the starter motor is used to assist in engine starting or the starter motor is used alone to start the engine, thereby avoiding start failures due to the high-voltage power supply and thereby increasing the probability of successful engine starting.
[0060] Based on the above, an embodiment of the present invention provides a low-temperature cold start control method. The above-mentioned HCU can be used to execute the low-temperature cold start control method of the present invention. In addition, the low-temperature cold start control method of the present invention can also be executed by other controllers.
[0061] The low-temperature cold start control method of this invention can be applied to a variety of hybrid architectures. Hybrid architectures can be categorized by motor placement, ranging from P0 to P4, collectively referred to as Px hybrids. P0, P1, P2, P3, and P4 all refer to motors in different positions. In addition to the single-motor hybrid architectures of P0-P4, dual-motor and triple-motor hybrid architectures are also available, such as P1+P3, P0+P2, P1+P4, P2+P4, and P0+P3+P4. Figure 1 and Figure 2 It is just an example of a hybrid architecture.
[0062] Reference Figure 3 A low-temperature cold start control method may include:
[0063] S11. When the current temperature meets a preset low temperature range, obtain vehicle hardware configuration information.
[0064] When starting the engine, the first step is to determine whether the current scenario is a low-temperature cold start scenario. Specifically, the current temperature, such as the water temperature, can be collected by a temperature sensor, and then a determination is made as to whether the current temperature meets a preset low-temperature range (such as the water temperature below -25 degrees Celsius). If so, it indicates that the current scenario is a low-temperature cold start scenario. If not, it indicates that the current scenario is not a low-temperature cold start scenario, and the generator can be directly controlled to drive the engine to rotate. When the engine speed reaches a second preset speed (such as 1000 rpm or 1200 rpm), the engine is controlled to inject fuel and ignite.
[0065] If the current scenario is a low temperature cold start, it is necessary to determine whether the current vehicle powertrain configuration is Figure 1 still Figure 2 ,Therefore, it is necessary to obtain the vehicle hardware configuration information and select the startup method based on the vehicle hardware configuration information.
[0066] The vehicle configuration information can be obtained from the storage component of the HCU. The vehicle hardware configuration information can be implemented in two ways. One is to include only the generator, i.e. Figure 2 , one includes both the generator and the starter motor, corresponding to Figure 1 .
[0067] S12: Determine a target startup strategy corresponding to the vehicle hardware configuration information from the startup strategies.
[0068] Among them, in the starting strategy, when the vehicle hardware configuration information only includes the generator, the first method of using the generator to start the engine multiple times is adopted. That is, the first method is to use only the generator to start the engine multiple times.
[0069] If the vehicle hardware configuration information includes both the generator and the starter motor, then based on the power source attribute information corresponding to the starter motor, the second method of starting the engine using the starter motor alone or the third method of starting the engine using both the starter motor and the generator simultaneously is selected. Specifically, if the powertrain is equipped with both a generator and a starter motor, consideration must be given to whether the engine should be started using only the starter motor or both the generator and the starter motor simultaneously.
[0070] In actual applications, when determining which starting method to use, since the starter motor also requires a 12V power supply, it is necessary to determine whether the current 12V power supply can support the starter motor to independently drive the engine.
[0071] Therefore, in this embodiment, referring to Figure 4 , step S12 may include:
[0072] S21. Determine whether the vehicle hardware configuration information includes a starter motor and a generator; if only the generator is included, execute step S22; if both the starter motor and the generator are included, execute step S23.
[0073] Specifically, the first method differs from the second and third methods in whether a starter motor is configured in the powertrain. Therefore, in this embodiment, it is necessary to determine whether the vehicle hardware configuration information includes a starter motor and a generator.
[0074] S22: Determine the first mode as the target startup strategy.
[0075] If only the generator is included, the engine can only be started using the generator. The engine is then started using the generator for a period of time, then stopped for a period of time, started again, and stopped again. This cycle repeats several times before starting the engine normally. This approach establishes lubrication, reduces starting resistance, improves start smoothness, and thus increases the probability of a successful start. In this case, the target start strategy is the first approach described above.
[0076] S23. Obtaining power supply attribute information corresponding to the starter motor.
[0077] Specifically, if the starter motor and the generator are included at the same time, it is necessary to determine whether to adopt the second method or the third method.
[0078] The difference between the second method and the third method is whether only the starter motor is used to drag the engine to start, or whether the generator and the starter motor are used simultaneously to drag the engine to start.
[0079] The method used is determined by the power level of the 12V power supply that powers the starter motor. The power level of the 12V power supply is a type of power supply attribute information. Therefore, it is necessary to first obtain the power supply attribute information and extract the power level of the 12V power supply from it. In this embodiment, the SOC (State of Charge) of the 12V power supply can be directly extracted and used as the power level of the 12V power supply.
[0080] In addition, since the power of a 12V power supply is related to the voltage, the more power it has, the higher the voltage. Therefore, the power of a 12V power supply can also be indirectly analyzed through the voltage value.
[0081] Therefore, in this embodiment, the SOC value or voltage value of the 12V power supply can be extracted from the power supply attribute information.
[0082] S24. Determine whether the power supply attribute information meets the preset independent startup conditions; if so, execute step S25; if not, execute step S26.
[0083] S25: Determine the second mode as the target startup strategy.
[0084] S26: Determine the third method as the target startup strategy.
[0085] Specifically, the preset independent starting condition in this embodiment is used to determine whether there is sufficient electric energy to support the starter motor to independently drive the engine to start.
[0086] In actual applications, if the starter motor is used alone to start the engine, a large amount of electrical energy is required to avoid the problem of failure to start the engine due to insufficient starting power, and the large power consumption leads to a shortened power life.
[0087] The preset independent start condition in this embodiment can be set to 12V power supply SOC>85%.
[0088] Or 12v power supply voltage>10v.
[0089] If the preset independent starting conditions are met, it means that the current 12V power supply can provide sufficient power to enable the starter motor to start the engine, and the target starting strategy directly adopts the second method, that is, the starter motor alone starts the engine. If the preset independent starting conditions are not met, it means that the current 12V power supply cannot provide sufficient power to enable the starter motor to start the engine. When the power of the 12V power supply is insufficient and the discharge power of the high-voltage power supply is weak, combining the two and simultaneously starting the engine is the current optimal method. In this case, the target starting strategy directly adopts the third method, that is, the starter motor and generator simultaneously start the engine.
[0090] S13: Perform engine start control operation using the target start strategy.
[0091] Specifically, according to the specific content of the target startup strategy, it is divided into three situations: starting in the first way, the second way or the third way, which are introduced below respectively.
[0092] 1. When the target startup strategy adopts the first method, step S13 may include:
[0093] 1) According to a first preset speed, the generator is controlled to drive the engine to rotate multiple times.
[0094] In this embodiment, the generator drags the engine to rotate multiple times in order to increase lubrication, thereby reducing starting resistance and improving starting smoothness.
[0095] When dragging multiple times, the starting speed should not be too high, and a gradual approach should be adopted to slowly adapt to the starting resistance.
[0096] Therefore, in this embodiment, the generator should be controlled to drag the engine to rotate at a first preset speed (which should be lower than the speed during normal startup, such as 100 rpm, 200 rpm or 300 rpm). When the speed of the engine reaches the first preset speed, the current dragging state is controlled to maintain a first preset time period (such as 3s).
[0097] During towing, closed-loop control, such as PID (Proportional Integral Derivative) control, can be employed. For example, the HCU acquires a first preset speed and then uses PID control to control the generator. Because the generator is rigidly connected to the engine, the engine drives the engine, and the generator torque, engine speed, and engine torque change accordingly based on the actual process.
[0098] When the engine speed reaches a first preset speed, such as 200 rpm, the engine is continuously dragged for a first preset time period, such as 3 seconds.
[0099] After the first preset time period ends, within a second preset time period (e.g., 2 seconds), the generator is controlled to stop driving the engine to rotate. At this time, the generator torque, engine speed, and engine torque change accordingly according to the actual process.
[0100] After the second preset time period ends, the generator is controlled again to drive the engine to rotate at the first preset speed until the number of cycles reaches the preset number. Through experimental research, the optimal preset number of times is 2, and other options can also be 3, 4, etc.
[0101] In actual application, based on the first preset speed, GM first uses a certain torque closed loop to drag the engine to 200rpm, stops after 3s, waits for 2s, and then drags the engine to 200rpm for the second time to reduce engine resistance and establish lubrication. The engine is started for the third time according to the normal GM starting process.
[0102] 2) According to a second preset speed, the generator is controlled to continuously drive the engine to rotate, and when the speed of the engine reaches the second preset speed, the engine is controlled to inject fuel and ignite; the first preset speed is less than the second preset speed.
[0103] The first preset speed is smaller than the second preset speed, and the second preset speed may be the target speed mentioned above, such as 1000 rpm or 1200 rpm.
[0104] After the first two pre-starts, the engine is started a third time according to the normal GM start process. At this time, the generator is controlled to continuously drive the engine at a second preset speed. When the engine speed reaches the second preset speed, the engine is controlled to inject fuel and ignite. The specific torque and speed vary according to the actual process.
[0105] 2. When the target startup strategy adopts the second method, step S13 may include:
[0106] The starter motor is controlled to drive the engine to rotate, and when the rotation speed of the engine reaches a second preset rotation speed, the engine is controlled to inject fuel and ignite.
[0107] In the second mode, only the starter motor is used to drive the engine to rotate. At this time, the HCU can give a given torque or a given speed, and send the torque or the given speed to the EMS. The EMS controls the starter motor to drive the engine to rotate. When the speed reaches a second preset speed, the HCU controls the engine to inject fuel and ignite.
[0108] 3. When the target startup strategy adopts the third method, step S13 may include:
[0109] The starter motor and the generator are controlled to simultaneously drive the engine to rotate, and when the rotation speed of the engine reaches a second preset rotation speed, the engine is controlled to inject fuel and ignite.
[0110] Specifically, in low-temperature conditions, where resistance is high, battery discharge power is low and sustained, starting is difficult, and starting with 12V battery power is difficult, the third method is used. In this method, a 12V starter motor + GM starting method is used. The HCU controls the generator, and the EMS controls the starter motor. Torque or speed can be set, and then the starter motor and generator are controlled separately to simultaneously drive the engine, allowing for smoother engine speed buildup. When the engine speed reaches a second preset speed, fuel injection and ignition are controlled. Torque and speed vary accordingly.
[0111] From the above, it can be seen that in this embodiment, when there is no starting motor, before starting the engine, the GM motor first controls the engine speed (200rpm) in a closed loop, and the overall dragging cycle is 5s (dragging for 3s, stopping for 2s), which is executed twice to establish lubrication to reduce starting resistance and improve starting smoothness.
[0112] When the 12V starting motor is present, the engine will start at low temperatures (water temperature below -25 degrees Celsius) and the 12V power supply SOC or voltage is high, which increases the chances of a successful start. When the 12V power supply SOC or voltage is low, the engine can be started simultaneously with the 12V motor and the GM, increasing the chances of a successful start.
[0113] In practical application, the overall solution of the present invention is divided into two cases. The first case refers to Figure 5 . When there is a starter motor, after the vehicle high voltage is powered on, if it is detected that the engine is in a stopped state, the HCU is ready to request a start. When the water temperature is greater than -25℃, the GM start method is adopted, and the HCU controls the GM to start normally. If the water temperature is not greater than -25℃, it is judged that the 12v power supply SOC>85%, or the 12v power supply voltage>10v. If either is met, the 12V starter motor start method is adopted. At this time, the HCU requests the EMS to execute the 12V starter motor start, and the starter motor alone drags the engine to start.
[0114] If the condition of 12V power supply SOC>85% or 12V power supply voltage>10V is not met, the 12V starter motor + GM starting method is adopted. The HCU requests the EMS to execute the 12V starter start, and the HCU controls the GM start at the same time.
[0115] In the second case, refer to Figure 6 At this time, there is no starter motor, only the generator. When the water temperature is greater than -25°C, the GM starting method is adopted, and the HCU controls the GM to start normally. If the water temperature is not greater than -25°C, the HCU controls the GM to start three times. For details, please refer to the corresponding instructions above.
[0116] In this embodiment, when the temperature is low, if the vehicle hardware configuration information includes only the generator, the first method of using the generator to start the engine multiple times can be used to reduce engine starting resistance, improve starting smoothness, and thereby increase the probability of successful engine starting. Furthermore, if the vehicle hardware configuration information includes both the generator and the starter motor, based on the power supply attribute information corresponding to the starter motor, the second method of using the starter motor alone to start the engine or the third method of using the starter motor and generator to start the engine simultaneously can be used. This allows the starter motor to assist in starting the engine, or to start the engine solely, rather than using the generator, when the high-voltage battery powering the generator is weak due to low-temperature discharge power. This avoids start failures due to high-voltage power supply issues and thereby increases the probability of successful engine starting.
[0117] Based on the embodiment of the low-temperature cold start control method, another embodiment of the present invention provides a low-temperature cold start control device, referring to Figure 7 , which may include:
[0118] The information acquisition module 11 is used to obtain vehicle hardware configuration information when the current temperature meets the preset low temperature range;
[0119] a strategy determination module 12 for determining, from a startup strategy, a target startup strategy corresponding to the vehicle hardware configuration information; wherein, in the startup strategy, if the vehicle hardware configuration information includes only a generator, a first method of using the generator to start the engine multiple times is adopted; and, if the vehicle hardware configuration information includes both the generator and a starter motor, based on power supply attribute information corresponding to the starter motor, a second method of using the starter motor alone to start the engine is adopted, or a third method of using the starter motor and the generator to start the engine simultaneously is adopted;
[0120] The starting control module 13 is configured to perform an engine starting control operation using the target starting strategy.
[0121] Furthermore, the strategy determination module 12 includes:
[0122] an information determination submodule, configured to determine whether the vehicle hardware configuration information includes a starter motor and a generator;
[0123] a first strategy determination submodule, configured to determine the first mode as the target startup strategy if only the generator is included;
[0124] An attribute acquisition submodule, configured to acquire attribute information of a power supply corresponding to the starter motor if both the starter motor and the generator are included;
[0125] A judgment submodule, configured to judge whether the power supply attribute information satisfies a preset independent startup condition;
[0126] The second strategy determination submodule is configured to determine the second mode as the target startup strategy if the second mode is satisfied; and to determine the third mode as the target startup strategy if the third mode is not satisfied.
[0127] Furthermore, when the target startup strategy adopts the first mode, the startup control module 13 includes:
[0128] A first drag submodule is used to control the generator to drag the engine to rotate multiple times according to a first preset speed;
[0129] The second drag submodule is used to control the generator to continuously drag the engine to rotate according to a second preset speed; when the speed of the engine reaches the second preset speed, control the engine to inject fuel and ignite; the first preset speed is less than the second preset speed.
[0130] Furthermore, the first dragging submodule is specifically used for:
[0131] The generator is controlled to drag the engine to rotate at a first preset speed. When the speed of the engine reaches the first preset speed, the current dragging state is controlled to maintain a first preset time period. After the first preset time period ends, the generator is controlled to stop dragging the engine within a second preset time period. After the second preset time period ends, the generator returns to the step of controlling the generator to drag the engine at the first preset speed, and the steps are executed sequentially until the number of cycles reaches a preset number.
[0132] Furthermore, when the target startup strategy adopts the second mode, the startup control module 13 includes:
[0133] The third drag submodule is used to control the starter motor to drag the engine to rotate, and when the speed of the engine reaches a second preset speed, control the engine to inject fuel and ignite.
[0134] Furthermore, when the target startup strategy adopts the third mode, the startup control module 13 includes:
[0135] The fourth drag submodule is used to control the starter motor and the generator to simultaneously drag the engine to rotate, and control the engine to inject fuel and ignite when the speed of the engine reaches a second preset speed.
[0136] Furthermore, the starting control module 13 is also used to control the generator to drive the engine to rotate when the current temperature does not meet the preset low temperature range, and control the engine to spray fuel and ignite when the engine speed reaches a second preset speed.
[0137] In this embodiment, when the temperature is low, if the vehicle hardware configuration information includes only the generator, the first method of using the generator to start the engine multiple times can be used to reduce engine starting resistance, improve starting smoothness, and thereby increase the probability of successful engine starting. Furthermore, if the vehicle hardware configuration information includes both the generator and the starter motor, based on the power supply attribute information corresponding to the starter motor, the second method of using the starter motor alone to start the engine or the third method of using the starter motor and generator to start the engine simultaneously can be used. This allows the starter motor to assist in starting the engine, or to start the engine solely, rather than using the generator, when the high-voltage battery powering the generator is weak due to low-temperature discharge power. This avoids start failures due to high-voltage power supply issues and thereby increases the probability of successful engine starting.
[0138] It should be noted that, for the working process of each module and sub-module in this embodiment, please refer to the corresponding description in the above embodiment, which will not be repeated here.
[0139] Based on the above-mentioned embodiments of the low-temperature cold start control method and apparatus, another embodiment of the present invention provides a low-temperature cold start control device, including: a memory and a processor;
[0140] Wherein, the memory is used to store programs;
[0141] The processor calls a program and is used to execute the above-mentioned low-temperature cold start control method.
[0142] It should be noted that the low-temperature cold start control device in this embodiment may be the HCU mentioned above.
[0143] In this embodiment, when the temperature is low, if the vehicle hardware configuration information includes only the generator, the first method of using the generator to start the engine multiple times can be used to reduce engine starting resistance, improve starting smoothness, and thereby increase the probability of successful engine starting. Furthermore, if the vehicle hardware configuration information includes both the generator and the starter motor, based on the power supply attribute information corresponding to the starter motor, the second method of using the starter motor alone to start the engine or the third method of using the starter motor and generator to start the engine simultaneously can be used. This allows the starter motor to assist in starting the engine, or to start the engine solely, rather than using the generator, when the high-voltage battery powering the generator is weak due to low-temperature discharge power. This avoids start failures due to high-voltage power supply issues and thereby increases the probability of successful engine starting.
[0144] Based on the above-mentioned embodiment of the low-temperature cold start control device, another embodiment of the present invention provides a vehicle, including the above-mentioned low-temperature cold start control device, and also including a starter motor and a generator, and the starter motor and the generator drag the engine to rotate based on the control of the low-temperature cold start control device.
[0145] In this embodiment, the control process of the low-temperature cold start control device controlling the starter motor and the generator to start the engine can be referred to the corresponding description above.
[0146] In this embodiment, when the temperature is low, if the vehicle hardware configuration information includes only the generator, the first method of using the generator to start the engine multiple times can be used to reduce engine starting resistance, improve starting smoothness, and thereby increase the probability of successful engine starting. Furthermore, if the vehicle hardware configuration information includes both the generator and the starter motor, based on the power supply attribute information corresponding to the starter motor, the second method of using the starter motor alone to start the engine or the third method of using the starter motor and generator to start the engine simultaneously can be used. This allows the starter motor to assist in starting the engine, or to start the engine solely, rather than using the generator, when the high-voltage battery powering the generator is weak due to low-temperature discharge power. This avoids start failures due to high-voltage power supply issues and thereby increases the probability of successful engine starting.
[0147] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A low temperature cold start control method, characterized in that: include: When the current temperature meets the preset low temperature range, obtain the vehicle hardware configuration information; determining, from the starting strategy, a target starting strategy corresponding to the vehicle hardware configuration information; wherein, in the starting strategy, if the vehicle hardware configuration information includes only a generator, a first method of using the generator to start the engine multiple times is adopted; and if the vehicle hardware configuration information includes both the generator and a starter motor, based on power supply attribute information corresponding to the starter motor, a second method of using the starter motor alone to start the engine is adopted, or a third method of using the starter motor and the generator to start the engine simultaneously is adopted; An engine start control operation is performed using the target start strategy.
2. The low-temperature cold start control method according to claim 1, characterized in that: Determining a target startup strategy corresponding to the vehicle hardware configuration information from the startup strategy includes: determining whether the vehicle hardware configuration information includes a starter motor and a generator; If only the generator is included, the first mode is determined as the target startup strategy; If both the starter motor and the generator are included, obtaining power supply attribute information corresponding to the starter motor; Determining whether the power supply attribute information meets the preset independent startup conditions; If satisfied, determining the second method as the target startup strategy; If not, the third method is determined as the target startup strategy.
3. The low-temperature cold start control method according to claim 1, characterized in that: When the target startup strategy adopts the first mode, performing the engine startup control operation using the target startup strategy includes: According to a first preset speed, controlling the generator to drive the engine to rotate multiple times; controlling the generator to continuously drive the engine to rotate according to a second preset speed; When the rotation speed of the engine reaches the second preset rotation speed, the engine is controlled to inject fuel and ignite; the first preset rotation speed is less than the second preset rotation speed.
4. The low-temperature cold start control method according to claim 3, characterized in that: According to a first preset speed, controlling the generator to drive the engine to rotate multiple times includes: controlling the generator to drive the engine to rotate at a first preset speed, and when the speed of the engine reaches the first preset speed, controlling the current driving state to maintain a first preset time period; After the first preset time period ends, within a second preset time period, controlling the generator to stop driving the engine to rotate; After the second preset time period ends, the process returns to the step of controlling the generator to drive the engine to rotate at the first preset speed, and the process is executed sequentially until the number of cycles reaches the preset number.
5. The low-temperature cold start control method according to claim 1, characterized in that: When the target startup strategy adopts the second mode, performing the engine startup control operation using the target startup strategy includes: The starter motor is controlled to drive the engine to rotate, and when the rotation speed of the engine reaches a second preset rotation speed, the engine is controlled to inject fuel and ignite.
6. The low-temperature cold start control method according to claim 1, characterized in that: When the target startup strategy adopts the third mode, performing the engine startup control operation using the target startup strategy includes: The starter motor and the generator are controlled to simultaneously drive the engine to rotate, and when the rotation speed of the engine reaches a second preset rotation speed, the engine is controlled to inject fuel and ignite.
7. The low-temperature cold start control method according to claim 1, characterized in that: If the current temperature does not meet the preset low temperature range, it also includes: The generator is controlled to drive the engine to rotate, and when the rotation speed of the engine reaches a second preset rotation speed, the engine is controlled to inject fuel and ignite.
8. A low temperature cold start control device, characterized in that: include: An information acquisition module, used to obtain vehicle hardware configuration information when the current temperature meets a preset low temperature range; a strategy determination module for determining, from a startup strategy, a target startup strategy corresponding to the vehicle hardware configuration information; wherein, in the startup strategy, if the vehicle hardware configuration information includes only a generator, a first method of using the generator to start the engine multiple times is adopted; and, if the vehicle hardware configuration information includes both the generator and a starter motor, based on power supply attribute information corresponding to the starter motor, a second method of using the starter motor alone to start the engine is adopted, or a third method of using the starter motor and the generator to start the engine simultaneously is adopted; A start control module is configured to perform an engine start control operation using the target start strategy.
9. A low-temperature cold start control device, characterized in that: include: memory and processor; Wherein, the memory is used to store programs; The processor calls a program and is used to execute the low-temperature cold start control method according to any one of claims 1 to 7.
10. A vehicle, characterized in that: The low-temperature cold start control device according to claim 9 further comprises a starter motor and a generator, wherein the starter motor and the generator drive the engine to rotate based on the control of the low-temperature cold start control device.