CN114312738A - Cold start control method, device, medium, vehicle control unit and system - Google Patents
Cold start control method, device, medium, vehicle control unit and system Download PDFInfo
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Abstract
The disclosure relates to a cold start control method, a cold start control device, a cold start control medium, a vehicle control unit and a system. The method comprises the following steps: acquiring an engine starting instruction; responding to a starting instruction, and controlling a battery relay to be closed; if the temperature of the power battery is smaller than a preset temperature threshold value, acquiring the starting power of the generator and the available discharging power of the power battery; and if the starting power is greater than the available discharging power and the difference between the starting power and the output power of the power battery is less than or equal to the output power of the bidirectional DC/DC converter, controlling the bidirectional DC/DC converter to boost in the reverse direction, and controlling the generator to start the engine by using the electric energy provided by the low-voltage storage battery and the power battery. Like this, can guarantee the normal start of engine, avoid the problem that the engine performance drops or power is not enough to lead to can't start under the low temperature environment, promote to use car to experience. The engine is started by the generator, so that the starting smoothness of the engine can be obviously improved.
Description
Technical Field
The disclosure relates to the field of vehicle control, in particular to a cold start control method, a cold start control device, a cold start control medium, a vehicle control unit and a system.
Background
With the increasing shortage of conventional energy and the increasing increase of environmental pollution, new energy vehicles have become more popular, and among them, vehicles equipped with hybrid systems have been widely used. At present, for a vehicle equipped with a hybrid system, when the temperature of a power battery is higher than-10 ℃, an engine is started by using a Generator (e.g., Belt-Driven Starter Generator (BSG)) which utilizes a Belt drive to achieve both starting and power generation, and when the temperature of the power battery is lower than-10 ℃, the engine is started by using electric energy provided by a low-voltage battery (e.g., 12V battery) by a Starter. But in case of starting the engine with the starter when the temperature of the power battery is lower than-10 ℃: because the environment temperature is low, the performance of the starter is likely to be reduced due to the influence of the temperature, and the engine can not be started possibly; in addition, when the low-voltage storage battery for supplying power to the starter is low in electric quantity, the engine cannot be started, and vehicle experience is influenced.
Disclosure of Invention
In order to overcome the problems in the related art, the present disclosure provides a cold start control method, device, medium, vehicle control unit and system.
In order to achieve the above object, in a first aspect, the present disclosure provides a cold start control method for a hybrid power system, applied to a vehicle control unit, where the hybrid power system includes an engine, a generator, a power battery, and the vehicle control unit, the generator is connected to the engine and the power battery, respectively, the vehicle control unit is connected to the generator, the power battery, and the engine, respectively, the hybrid power system further includes a bidirectional DC/DC converter and a low-voltage battery, where the generator is connected to the low-voltage battery through the bidirectional DC/DC converter, the bidirectional DC/DC converter is connected to the vehicle control unit, and the bidirectional DC/DC converter and the low-voltage battery are respectively used for being connected to a low-voltage load;
the method comprises the following steps:
acquiring an engine starting instruction;
responding to the starting instruction, and controlling a power battery relay to be closed;
if the temperature of the power battery is smaller than a preset temperature threshold, acquiring starting power of the generator and available discharging power of the power battery, wherein the available discharging power is equal to the difference value between the output power of the power battery and the maximum required power of a low-voltage load;
and if the starting power is greater than the available discharging power and the difference value between the starting power and the output power of the power battery is less than or equal to the output power of the bidirectional DC/DC converter, controlling the bidirectional DC/DC converter to boost reversely so that the low-voltage storage battery supplies power to the generator, and controlling the generator to start the engine by using the electric energy provided by the low-voltage storage battery and the power battery.
Optionally, the hybrid power system further comprises a starter, wherein the starter is respectively connected with the low-voltage battery, the engine and the vehicle controller;
the method further comprises the following steps:
and if the starting power is greater than the available discharging power and the difference value between the starting power and the output power of the power battery is greater than the output power of the bidirectional DC/DC converter, controlling the starter to start the engine by using the electric energy provided by the low-voltage storage battery.
Optionally, the method further comprises:
and if the temperature of the power battery is greater than or equal to the preset temperature threshold value, or the temperature of the power battery is less than the preset temperature threshold value and the starting power is less than or equal to the available discharging power, controlling the generator to start the engine by using the electric energy provided by the power battery.
Optionally, the method further comprises:
after the engine is started, if the electric quantity of the low-voltage storage battery is smaller than a preset electric quantity threshold value, the bidirectional DC/DC converter is controlled to reduce the voltage in the forward direction, and the low-voltage storage battery is charged through the generator.
Optionally, before the step of controlling the power battery relay to close, the method further comprises:
responding to the starting instruction, and performing anti-theft authentication on the engine;
if the anti-theft authentication of the engine is successful, executing the step of controlling the power battery relay to be closed;
and if the engine anti-theft authentication fails, locking the engine and/or giving an alarm.
Optionally, before the step of controlling the power battery relay to close, the method further comprises:
if the engine anti-theft authentication is successful, performing anti-theft authentication on the transmission controller;
if the anti-theft authentication of the gearbox controller is successful, executing the step of controlling the power battery relay to be closed;
and if the anti-theft authentication of the gearbox controller fails, locking the engine and/or alarming.
In a second aspect, the present disclosure provides a cold start control device of a hybrid power system, which is applied to a vehicle control unit, wherein the hybrid power system includes an engine, a generator, a power battery and the vehicle control unit, the generator is respectively connected to the engine and the power battery, the vehicle control unit is respectively connected to the generator, the power battery and the engine, the generator is further connected to a low-voltage battery through a bidirectional DC/DC converter, the bidirectional DC/DC converter is connected to the vehicle control unit, and the bidirectional DC/DC converter and the low-voltage battery are respectively used for being connected to a low-voltage load;
the device comprises:
the first acquisition module is used for acquiring an engine starting instruction;
the control module is used for responding to the starting instruction acquired by the first acquisition module and controlling the power battery relay to be closed;
the second obtaining module is used for obtaining starting power of the generator and available discharging power of the power battery if the temperature of the power battery is smaller than a preset temperature threshold, wherein the available discharging power is equal to a difference value between the output power of the power battery and the maximum required power of a low-voltage load;
the control module is further configured to control the bidirectional DC/DC converter to boost in a reverse direction if the starting power acquired by the second acquisition module is greater than the available discharging power and a difference between the starting power and the output power of the power battery is less than or equal to the output power of the bidirectional DC/DC converter, so that the low-voltage battery supplies power to the generator, and the generator is controlled to start the engine by using the electric energy provided by the low-voltage battery and the power battery.
In a third aspect, the present disclosure provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the method provided by the first aspect of the present disclosure.
In a fourth aspect, the present disclosure provides a vehicle control unit, including:
a memory having a computer program stored thereon;
a processor for executing the computer program in the memory to implement the steps of the method provided by the first aspect of the present disclosure.
In a fifth aspect, the present disclosure provides a hybrid power system, including an engine, a generator, a power battery and a vehicle control unit, where the generator is connected to the engine and the power battery respectively, and the vehicle control unit is connected to the generator, the power battery and the engine respectively, and the hybrid power system further includes: the generator is connected with the low-voltage storage battery through the bidirectional DC/DC converter, and the bidirectional DC/DC converter and the low-voltage storage battery are respectively used for being connected with a low-voltage load;
the vehicle control unit is connected with the bidirectional DC/DC converter and configured to perform the steps of the method provided by the first aspect of the disclosure.
In the technical scheme, when the temperature of the power battery is smaller than a preset temperature threshold value, the hybrid power system (specifically an engine) is in a cold start state, and at the moment, the starting power of the generator and the available discharging power of the power battery are obtained; and under the condition that the starting power is greater than the available discharging power and the difference value between the starting power and the output power of the power battery is less than or equal to the output power of the bidirectional DC/DC converter, the bidirectional DC/DC converter reversely boosts the low-voltage storage battery to supply power to the generator, so that the generator can start the engine by using the electric energy provided by the low-voltage storage battery and the power battery, the normal starting of the engine can be ensured, the problem that the engine cannot be started due to performance reduction or insufficient power of the starter in a low-temperature environment is avoided, and the vehicle using experience is improved. In addition, the engine is started by the aid of the generator, the rotating speed of the engine can be rapidly increased through the generator, the engine can cross a low-speed shaking interval to be ignited again, starting smoothness of the engine is obviously improved, vehicle noise and vibration are reduced, vehicle stability is good, comfort is high, and vehicle using experience is further improved.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
FIG. 1 is a block diagram illustrating a hybrid powertrain system according to an exemplary embodiment.
FIG. 2 is a flowchart illustrating a method of cold start control of a hybrid powertrain system, according to an exemplary embodiment.
FIG. 3 is a block diagram illustrating a hybrid powertrain system according to another exemplary embodiment.
FIG. 4 is a flowchart illustrating a method of cold start control of a hybrid powertrain system, according to another exemplary embodiment.
FIG. 5 is a block diagram illustrating a cold start control apparatus of a hybrid powertrain system in accordance with an exemplary embodiment.
Description of the reference numerals
10 engine 20 generator
30 power battery 40 vehicle control unit
50 bidirectional DC/DC converter 60 low-voltage battery
70 low-voltage load 80 starter
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
FIG. 1 is a block diagram illustrating a hybrid powertrain system according to an exemplary embodiment. As shown in fig. 1, the hybrid system includes an engine 10, a generator 20, a power battery 30, a hybrid controller 40, a bidirectional DC/DC converter 50, and a low-voltage battery 60 (e.g., 12V battery, 24V battery, etc.). The generator 20 is connected to the engine 10 and the power battery 30, the vehicle controller 40 is connected to the generator 20, the power battery 30, the bidirectional DC/DC converter 50, and the engine 10, and the generator 20 is connected to the low-voltage battery 60 through the bidirectional DC/DC converter 50. As shown in fig. 1, the bidirectional DC/DC converter 50 and the low-voltage battery 60 are connected to a low-voltage load 70 (for example, an in-vehicle electrical device such as a lamp or a meter).
The bidirectional DC/DC converter 50 is a DC-DC converter that changes the direction of current as needed to realize bidirectional flow of energy while maintaining the polarity of the DC voltage at both ends of the converter unchanged. The operation modes of the bidirectional DC/DC converter include a forward Buck mode (i.e., Buck mode) and a reverse Boost mode (i.e., Boost mode). When the bi-directional DC/DC converter is in Buck mode, the generator 20 may forward step down through the bi-directional DC/DC converter 50 to charge the low voltage battery 60 and may also forward step down through the bi-directional DC/DC converter to power the low voltage load 70. When the bidirectional DC/DC converter is in Boost mode, the low voltage battery 60 may be boosted in reverse by the bidirectional DC/DC converter 50 to power the generator 20.
The generator 20 may be, for example, a BSG motor, which is located at the front end of the engine 10 and connected to the engine 10 by a belt transmission, and the flexible connection of the belt does not generate mechanical vibration during power transmission. The BSG motor can also regulate and control the rotating speed of the engine, so that the smoothness of the vehicle in the aspects of starting and stopping, idling, gear shifting, accelerating and the like is greatly improved. Specifically, during the starting process of the engine 10, the BSG motor can rapidly pull up the rotation speed of the engine 10 to make the engine cross the low-speed shaking interval and then ignite, which significantly improves the starting smoothness of the engine. In the process of gear shifting and gear shifting, the BSG motor can pull up or reduce the rotating speed of the engine 10 to the rotating speed matched with the gear through belt transmission, and the rotating speed of the engine 10 is controlled through the BSG motor, so that the gear shifting smoothness is improved.
The hybrid controller 40 may be used to control hybrid system operation, including cold start of the hybrid system. Specifically, cold start of the hybrid system may be achieved through S201 to S207 shown in fig. 2.
In S201, an engine start instruction is acquired.
In the disclosure, the method may be applied to a vehicle control unit, and after the vehicle control unit is powered on, an engine starting instruction may be first obtained, and after the starting instruction is obtained, subsequent operations are executed. For a specific mode of acquiring an engine starting instruction by the vehicle control unit, reference may be made to a transmission mode of the starting instruction during engine starting in the prior art, and the specific process of acquiring the engine starting instruction is not limited in the embodiment of the disclosure.
In S202, in response to a start instruction, the power battery relay is controlled to close.
In S203, it is determined that the temperature of the power battery is less than a preset temperature threshold.
In the present disclosure, the preset temperature threshold may be, for example, -10 ℃. If the temperature of the power battery is smaller than the preset temperature threshold, namely the ambient temperature is also low, at this time, the hybrid power system (specifically the engine) needs to be cold started, and at this time, S204 is executed; if the temperature of the power battery is greater than or equal to the preset temperature threshold value, the engine can be started normally, and at this time, S207 is executed.
In S204, starting power of the generator and available discharging power of the power battery are obtained.
In the present disclosure, the starting power of the generator is the power required to start the engine by the generator, and the vehicle control unit may acquire the starting power by communicating with the generator. The available discharge power is equal to the difference between the output power of the power battery and the maximum required power of the low-voltage load, wherein the vehicle control unit can obtain the output power of the power battery by communicating with the battery management system, and the maximum required power of the low-voltage load is the sum of the required powers of all the low-voltage loads, for example, 0.8 KW.
In S205, it is determined whether the starting power is larger than the available discharging power.
In the present disclosure, if the starting power of the generator is greater than the available discharging power of the power battery, which indicates that the power battery cannot meet the starting requirement of the generator while meeting the power supply requirement of the low-voltage load, then S206 is executed; if the starting power of the generator is less than or equal to the available discharging power of the power battery, it indicates that the power battery can simultaneously meet the starting requirement of the generator and the power supply requirement of the low-voltage load, at this time, the generator can be directly controlled to start the engine by using the electric energy provided by the power battery, that is, S207 is executed.
In S206, if the difference between the starting power and the output power of the power battery is less than or equal to the output power of the bidirectional DC/DC converter, the bidirectional DC/DC converter is controlled to boost in the reverse direction, so that the low-voltage battery supplies power to the generator, and the generator is controlled to start the engine using the electric energy supplied by the low-voltage battery and the power battery.
In the disclosure, if the difference between the starting power and the output power of the power battery is less than or equal to the output power of the bidirectional DC/DC converter, it indicates that the power of the generator can be compensated by the bidirectional DC/DC converter to meet the starting requirement of the generator, and at this time, the bidirectional DC/DC converter can reversely boost the low-voltage battery to supply power to the generator, so that the generator can start the engine by using the electric energy provided by the low-voltage battery and the power battery.
In addition, the low-voltage storage battery can be controlled to supply power to the low-voltage load so as to save the electric quantity of the power battery and provide sufficient power for starting the engine.
In S207, the generator is controlled to start the engine using the electric power supplied from the power battery.
In the disclosure, during the period that the generator starts the engine by using the electric energy provided by the power battery, the low-voltage load can be supplied by the low-voltage storage battery, and the bidirectional DC/DC converter can also be controlled to carry out forward voltage reduction, so that the power battery supplies power to the low-voltage load by the generator.
Preferably, the bidirectional DC/DC converter can forward reduce the voltage output by the generator to supply power for the low-voltage load, so that the aim of saving the electric quantity of the low-voltage storage battery can be achieved, and the low-voltage storage battery can be used for supplying power for the low-voltage load (such as a lamp) when a subsequent vehicle fails or is dormant.
In the technical scheme, when the temperature of the power battery is smaller than a preset temperature threshold value, the hybrid power system (specifically an engine) is in a cold start state, and at the moment, the starting power of the generator and the available discharging power of the power battery are obtained; and under the condition that the starting power is greater than the available discharging power and the difference value between the starting power and the output power of the power battery is less than or equal to the output power of the bidirectional DC/DC converter, the bidirectional DC/DC converter reversely boosts the low-voltage storage battery to supply power to the generator, so that the generator can start the engine by using the electric energy provided by the low-voltage storage battery and the power battery, the normal starting of the engine can be ensured, the problem that the engine cannot be started due to performance reduction or insufficient power of the starter in a low-temperature environment is avoided, and the vehicle using experience is improved. In addition, the engine is started by the aid of the generator, the rotating speed of the engine can be rapidly increased through the generator, the engine can cross a low-speed shaking interval to be ignited again, starting smoothness of the engine is obviously improved, vehicle noise and vibration are reduced, vehicle stability is good, comfort is high, and vehicle using experience is further improved.
As shown in fig. 3, the hybrid system further includes a starter 80, wherein the starter 80 is connected to the low-voltage battery 60, the engine 10 and the vehicle controller 40, respectively. In this way, the hybrid system may also start the engine via the starter. Specifically, cold start of the hybrid system may be achieved through S401 to S409 shown in fig. 4.
In S401, an engine start instruction is acquired.
In S402, in response to a start instruction, the power battery relay is controlled to close.
In S403, it is determined whether the temperature of the power battery is less than a preset temperature threshold.
In the present disclosure, if the temperature of the power battery is less than the preset temperature threshold, that is, the ambient temperature is also low, at this time, the engine needs to be cold started, and at this time, S404 is executed; if the temperature of the power battery is greater than or equal to the preset temperature threshold value, the engine can be started normally, and at this time, S409 is executed.
In S404, the starting power of the generator and the available discharging power of the power battery are obtained.
In S405, it is determined whether the starting power is greater than the available discharging power.
In the present disclosure, if the starting power of the generator is greater than the available discharging power of the power battery, which indicates that the power battery cannot meet the starting requirement of the generator while meeting the power supply requirement of the low-voltage load, then S406 is executed; if the starting power of the generator is less than or equal to the available discharging power of the power battery, it indicates that the power battery can meet the starting requirement of the generator, at this time, the generator can be directly controlled to start the engine by using the electric energy provided by the power battery, that is, S409 is executed.
In S406, it is determined whether the difference between the starting power and the output power of the power battery is less than or equal to the output power of the bidirectional DC/DC converter.
In the present disclosure, when the difference between the starting power and the output power of the power battery is less than or equal to the output power of the bidirectional DC/DC converter, it indicates that the power of the generator can be compensated by the bidirectional DC/DC converter to meet the starting requirement of the generator, at this time, S407 is executed; when the difference between the starting power and the output power of the power battery is greater than the output power of the bidirectional DC/DC converter, it indicates that the power compensation cannot be performed on the generator through the bidirectional DC/DC converter, and at this time, the engine may be started through the starter, i.e., S408 is performed.
In S407, the bidirectional DC/DC converter is controlled to boost in reverse so that the low-voltage battery supplies power to the generator, and the generator is controlled to start the engine using the electric power supplied from the low-voltage battery and the power battery.
In S408, the starter is controlled to start the engine using the electric power supplied from the low-voltage battery.
In the disclosure, during the starting of the engine by the starter by using the electric energy provided by the low-voltage storage battery, the low-voltage load can be supplied by the low-voltage storage battery, and the bidirectional DC/DC converter can also be controlled to carry out forward voltage reduction, so that the power battery supplies power to the low-voltage load through the generator.
Preferably, the bidirectional DC/DC converter can forward reduce the voltage output by the generator to supply power for the low-voltage load, so that the aim of saving the electric quantity of the low-voltage storage battery can be achieved, and the low-voltage storage battery can be used for supplying power for the low-voltage load (such as a lamp) when a subsequent vehicle fails or is dormant.
In S409, the generator is controlled to start the engine using the electric power supplied from the power battery.
In the disclosure, during the period that the generator starts the engine by using the electric energy provided by the power battery, the low-voltage load can be supplied by the low-voltage storage battery, and the bidirectional DC/DC converter can also be controlled to carry out forward voltage reduction so that the power battery supplies power for the low-voltage load.
Preferably, the bidirectional DC/DC converter can forward reduce the voltage output by the generator to supply power for the low-voltage load, so that the aim of saving the electric quantity of the low-voltage storage battery can be achieved, and the low-voltage storage battery can be used for supplying power for the low-voltage load (such as a lamp) when a subsequent vehicle fails or is dormant.
In addition, the above method may further include the steps of:
after the engine is started, if the electric quantity of the low-voltage storage battery is smaller than a preset electric quantity threshold value, the bidirectional DC/DC converter is controlled to reduce the voltage in the forward direction, and the low-voltage storage battery is charged through the generator. In this way, the low-voltage storage battery can be timely supplemented to supply power for low-voltage loads (such as vehicle lamps) when the vehicle is in a fault or is in a dormant state.
In order to improve the safety reliability of the keyless-start engine, before the power battery relay is controlled to be closed, the method may further include the steps of:
(1) and responding to the starting instruction, and performing anti-theft authentication on the engine.
Specifically, the vehicle Control unit sends an anti-theft authentication request to an Engine Control Module (ECM), the ECM sends a random number to the vehicle Control unit after receiving the anti-theft authentication request, the ECM and the vehicle Control unit perform Encryption operation on the random number respectively (for example, the ECM performs Encryption operation by using an Advanced Encryption Standard-128 (AES-128) Encryption algorithm), the vehicle Control unit sends the result of the Encryption operation to the ECM, the ECM matches the result of the Encryption operation with the result of the Encryption operation of the vehicle Control unit, if the result of the Encryption operation is matched with the result of the Encryption operation of the vehicle Control unit, the Engine anti-theft authentication is successful, the Engine is allowed to start, otherwise, the Engine anti-theft authentication fails, and at this time, the Engine is prohibited from starting.
(2) And if the anti-theft authentication of the engine is successful, executing a step of controlling the power battery relay to be closed.
(3) If the engine anti-theft authentication fails, the engine is locked and/or an alarm is given.
For example, the warning can be performed by sending a warning sound, flashing a car light, sending a warning message to a terminal (for example, a mobile phone of a car owner) having a binding relationship with the car, and the like, so that a user can take measures in time, and the safety of the car is improved.
In addition, in order to further improve the safety reliability of the keyless-start engine, before the power battery relay is controlled to be closed, the method may further include the following steps:
(4) and if the engine anti-theft authentication is successful, performing anti-theft authentication on the gearbox controller.
In the present disclosure, the transmission controller may be certified for theft protection in a manner similar to the engine theft protection certification described above, and therefore, the specific manner in which the transmission controller is certified for theft protection is not described in detail.
(5) And if the anti-theft authentication of the gearbox controller is successful, executing a step of controlling the power battery relay to be closed.
(6) If the transmission controller fails the anti-theft authentication, the engine is locked and/or an alarm is given.
FIG. 5 is a block diagram illustrating a cold start control apparatus of a hybrid powertrain system in accordance with an exemplary embodiment. The device 500 is applied to a vehicle control unit, wherein the hybrid power system comprises an engine, a generator, a power battery and the vehicle control unit, the generator is respectively connected with the engine and the power battery, the vehicle control unit is respectively connected with the generator, the power battery and the engine, and the hybrid power system further comprises a bidirectional DC/DC converter and a low-voltage storage battery.
The generator is connected with the low-voltage storage battery through the bidirectional DC/DC converter, the bidirectional DC/DC converter is connected with the vehicle control unit, and the bidirectional DC/DC converter and the low-voltage storage battery are respectively used for being connected with a low-voltage load.
The apparatus 500 comprises: a first obtaining module 501, configured to obtain an engine start instruction; a control module 502, configured to control a power battery relay to be closed in response to the start instruction acquired by the first acquisition module 501; a second obtaining module 503, configured to obtain starting power of the generator and available discharging power of the power battery if the temperature of the power battery is smaller than a preset temperature threshold, where the available discharging power is equal to a difference between output power of the power battery and a maximum required power of a low-voltage load; the control module 502 is further configured to control the bidirectional DC/DC converter to boost in a reverse direction if the starting power acquired by the second acquiring module 503 is greater than the available discharging power and a difference between the starting power and the output power of the power battery is less than or equal to the output power of the bidirectional DC/DC converter, so that the low-voltage battery supplies power to the generator, and the generator is controlled to start the engine by using the electric energy provided by the low-voltage battery and the power battery.
In the technical scheme, when the temperature of the power battery is smaller than a preset temperature threshold value, the hybrid power system (specifically an engine) is in a cold start state, and at the moment, the starting power of the generator and the available discharging power of the power battery are obtained; and under the condition that the starting power is greater than the available discharging power and the difference value between the starting power and the output power of the power battery is less than or equal to the output power of the bidirectional DC/DC converter, the bidirectional DC/DC converter reversely boosts the low-voltage storage battery to supply power to the generator, so that the generator can start the engine by using the electric energy provided by the low-voltage storage battery and the power battery, the normal starting of the engine can be ensured, the problem that the engine cannot be started due to performance reduction or insufficient power of the starter in a low-temperature environment is avoided, and the vehicle using experience is improved. In addition, the engine is started by the aid of the generator, the rotating speed of the engine can be rapidly increased through the generator, the engine can cross a low-speed shaking interval to be ignited again, starting smoothness of the engine is obviously improved, vehicle noise and vibration are reduced, vehicle stability is good, comfort is high, and vehicle using experience is further improved.
Optionally, the hybrid power system further comprises a starter, wherein the starter is respectively connected with the low-voltage battery, the engine and the vehicle controller; the control module 502 is further configured to control the starter to start the engine using the electric energy provided by the low-voltage battery if the starting power is greater than the available discharging power and a difference between the starting power and the output power of the power battery is greater than the output power of the bidirectional DC/DC converter.
Optionally, the control module 502 is further configured to control the generator to start the engine by using the electric energy provided by the power battery if the temperature of the power battery is greater than or equal to the preset temperature threshold, or the temperature of the power battery is less than the preset temperature threshold and the starting power is less than or equal to the available discharging power.
Optionally, the control module 502 is further configured to control the bidirectional DC/DC converter to forward step down to charge the low-voltage battery through the generator if the electric quantity of the low-voltage battery is smaller than a preset electric quantity threshold after the engine is started.
Optionally, the apparatus 500 further comprises: a first authentication module, configured to perform anti-theft authentication on the engine in response to the start instruction before the control module 502 controls the power battery relay to close; the triggering module is used for triggering the control module 502 to control the power battery relay to be closed if the engine anti-theft authentication is successful; the control module 502 is also configured to lock the engine and/or alarm if the engine authentication fails.
Optionally, the apparatus 500 further comprises: the second authentication module is used for performing anti-theft authentication on the transmission controller if the engine anti-theft authentication is successful before the control module 502 controls the power battery relay to be closed; the triggering module is further configured to trigger the control module 502 to control the power battery relay to be closed if the anti-theft authentication of the transmission controller is successful; the control module 502 is also configured to lock the engine and/or alarm if the transmission controller fails anti-theft authentication.
With regard to the apparatus in the above-described embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated here.
The present disclosure also provides a computer-readable storage medium having stored thereon a computer program that, when executed by a processor, implements the steps of the above-described hybrid system cold start control method provided by the present disclosure.
The present disclosure also provides a vehicle control unit, including: a memory having a computer program stored thereon; a processor for executing the computer program in the memory to implement the steps of the above-mentioned cold start control method of the hybrid system provided by the present disclosure.
The present disclosure also provides a vehicle including the above hybrid power system provided by the present disclosure.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, various possible combinations will not be separately described in this disclosure.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (10)
1. A cold start control method of a hybrid power system is applied to a vehicle control unit, wherein the hybrid power system comprises an engine, a generator, a power battery and the vehicle control unit, the generator is respectively connected with the engine and the power battery, and the vehicle control unit is respectively connected with the generator, the power battery and the engine, and the hybrid power system is characterized by further comprising a bidirectional DC/DC converter and a low-voltage storage battery, wherein the generator is connected with the low-voltage storage battery through the bidirectional DC/DC converter, the bidirectional DC/DC converter is connected with the vehicle control unit, and the bidirectional DC/DC converter and the low-voltage storage battery are respectively used for being connected with a low-voltage load;
the method comprises the following steps:
acquiring an engine starting instruction;
responding to the starting instruction, and controlling a power battery relay to be closed;
if the temperature of the power battery is smaller than a preset temperature threshold, acquiring starting power of the generator and available discharging power of the power battery, wherein the available discharging power is equal to the difference value between the output power of the power battery and the maximum required power of a low-voltage load;
and if the starting power is greater than the available discharging power and the difference value between the starting power and the output power of the power battery is less than or equal to the output power of the bidirectional DC/DC converter, controlling the bidirectional DC/DC converter to boost reversely so that the low-voltage storage battery supplies power to the generator, and controlling the generator to start the engine by using the electric energy provided by the low-voltage storage battery and the power battery.
2. The method of claim 1, wherein the hybrid powertrain system further includes a starter, wherein the starter is coupled to the low-voltage battery, the engine, and the vehicle control unit, respectively;
the method further comprises the following steps:
and if the starting power is greater than the available discharging power and the difference value between the starting power and the output power of the power battery is greater than the output power of the bidirectional DC/DC converter, controlling the starter to start the engine by using the electric energy provided by the low-voltage storage battery.
3. The method of claim 1, further comprising:
and if the temperature of the power battery is greater than or equal to the preset temperature threshold value, or the temperature of the power battery is less than the preset temperature threshold value and the starting power is less than or equal to the available discharging power, controlling the generator to start the engine by using the electric energy provided by the power battery.
4. The method of claim 1, further comprising:
after the engine is started, if the electric quantity of the low-voltage storage battery is smaller than a preset electric quantity threshold value, the bidirectional DC/DC converter is controlled to reduce the voltage in the forward direction, and the low-voltage storage battery is charged through the generator.
5. The method of any of claims 1-4, wherein prior to the step of controlling the power battery relay to close, the method further comprises:
responding to the starting instruction, and performing anti-theft authentication on the engine;
if the anti-theft authentication of the engine is successful, executing the step of controlling the power battery relay to be closed;
and if the engine anti-theft authentication fails, locking the engine and/or giving an alarm.
6. The method of claim 5, wherein prior to the step of controlling the power battery relay to close, the method further comprises:
if the engine anti-theft authentication is successful, performing anti-theft authentication on the transmission controller;
if the anti-theft authentication of the gearbox controller is successful, executing the step of controlling the power battery relay to be closed;
and if the anti-theft authentication of the gearbox controller fails, locking the engine and/or alarming.
7. A cold start control device of a hybrid power system is applied to a vehicle control unit, wherein the hybrid power system comprises an engine, a generator, a power battery and the vehicle control unit, the generator is respectively connected with the engine and the power battery, and the vehicle control unit is respectively connected with the generator, the power battery and the engine, and is characterized in that the generator is also connected with a low-voltage storage battery through a bidirectional DC/DC converter, the bidirectional DC/DC converter is connected with the vehicle control unit, and the bidirectional DC/DC converter and the low-voltage storage battery are respectively used for being connected with a low-voltage load;
the device comprises:
the first acquisition module is used for acquiring an engine starting instruction;
the control module is used for responding to the starting instruction acquired by the first acquisition module and controlling the power battery relay to be closed;
the second obtaining module is used for obtaining starting power of the generator and available discharging power of the power battery if the temperature of the power battery is smaller than a preset temperature threshold, wherein the available discharging power is equal to a difference value between the output power of the power battery and the maximum required power of a low-voltage load;
the control module is further configured to control the bidirectional DC/DC converter to boost in a reverse direction if the starting power acquired by the second acquisition module is greater than the available discharging power and a difference between the starting power and the output power of the power battery is less than or equal to the output power of the bidirectional DC/DC converter, so that the low-voltage battery supplies power to the generator, and the generator is controlled to start the engine by using the electric energy provided by the low-voltage battery and the power battery.
8. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 6.
9. A vehicle control unit, comprising:
a memory having a computer program stored thereon;
a processor for executing the computer program in the memory to carry out the steps of the method of any one of claims 1 to 6.
10. The utility model provides a hybrid power system, includes engine, generator, power battery and vehicle control unit, the generator respectively with the engine the power battery is connected, vehicle control unit respectively with the generator the power battery and the engine is connected, its characterized in that, hybrid power system still includes:
the generator is connected with the low-voltage storage battery through the bidirectional DC/DC converter, and the bidirectional DC/DC converter and the low-voltage storage battery are respectively used for being connected with a low-voltage load;
the vehicle control unit, connected to the bidirectional DC/DC converter, for performing the steps of the method of any of claims 1-6.
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| CN202011080621.7A CN114312738B (en) | 2020-10-10 | 2020-10-10 | Cold start control method, device, medium, whole vehicle controller and system |
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