CN111634282A

CN111634282A - Automobile start-stop control method and electronic equipment

Info

Publication number: CN111634282A
Application number: CN202010426390.4A
Authority: CN
Inventors: 余庆祥; 孙建伟; 何旭阳; 刘庆明; 潘朝晖
Original assignee: Dongfeng Motor Co Ltd
Current assignee: Dongfeng Motor Co Ltd
Priority date: 2020-05-19
Filing date: 2020-05-19
Publication date: 2020-09-08
Anticipated expiration: 2040-05-19
Also published as: CN111634282B

Abstract

The invention discloses an automobile start-stop control method and electronic equipment, wherein the method comprises the following steps: when the precision state of the storage battery sensor is a low-precision state, judging whether the state of the automobile storage battery meets a preset low-precision start-stop condition; and if the state of the storage battery meets the low-precision start-stop condition, allowing the start-stop function of the automobile, otherwise forbidding the start-stop function of the automobile. When the battery sensor is low in precision, the start-stop function is not directly forbidden, and the start-stop action is judged again by detecting whether the state of the battery meets the low-precision start-stop condition, so that the start-stop action function can still be realized when the battery sensor is low in precision.

Description

Automobile start-stop control method and electronic equipment

Technical Field

The invention relates to the technical field of automobiles, in particular to an automobile start-stop control method and electronic equipment.

Background

The automobile start-stop technology is a technology for starting an engine by starting and stopping the engine. In the existing start-Stop technology, a Battery Sensor (IBS) is required to detect the state of charge of the Battery, and therefore, the existing technology prohibits the execution of an Intelligent start-Stop function (ISS) when the Battery Sensor is in a low-precision condition. The low precision means that the State Of Charge (SOC) error Of the IBS is greater than a preset value, and the prior art sets the SOC error greater than 15% to be the IBS low precision State.

However, the accuracy of the battery sensor is degraded by disconnecting the battery negative line, removing the IBS plug, or integrating the IBS error.

For example, disconnecting the battery negative line results in a low IBS report accuracy: when the negative line of the storage battery is disconnected and then connected back to the negative line, the IBS reports low precision (SOC _ STATE is 00 b). In many cases, the negative electrode line is disconnected from the maintenance electrical equipment such as 4S, a car repair factory, and a customer himself, the battery is taken off and charged, and then the battery is put back.

For another example, unplugging IBS plug-ins results in a low IBS report accuracy: when the IBS connector is unplugged: the IBS is powered off and then power is restored, at which time the IBS reports low accuracy (SOC _ STATE ═ 00 b).

As another example, IBS error accumulation results in a low accuracy IBS report: the vehicle runs continuously for more than 48h, and IBS reports low accuracy (SOC _ STATE ═ 00 b).

In the above case, the vehicle is typically stationary for 4 to 8 hours, the accuracy of IBS is restored to availability, and ISS is disabled during these 4 to 8 hours.

For example, (1) a recovery method caused by a disconnection of the negative line of the battery:

the storage battery is static for less than 4h before being installed back: the negative pole line is connected back, and the vehicle can be recovered after being static for at most 8 h;

the storage battery is static for more than 4h before being installed back: and (5) connecting the negative pole line, and recovering after the vehicle is static for 4 h.

(2) Recovery method caused by pulling out IBS connector: and (5) connecting the plug connector back, and recovering after the vehicle is static for 4-8 hours.

(3) Recovery method due to accumulation of IBS errors: the vehicle can be recovered after being flamed out and stationary for at most 8 h.

Specifically, in the conventional ISS operation strategy, when the SOC _ STATE Of the battery sensor (IBS) is 00b (i.e., low accuracy: SOC error > 15%), the STATE Of Charge (SOC) detected by the IBS is considered to be unreliable, and therefore the ISS operation is prohibited, and the ISS operation is allowed only when the IBS returns from low accuracy to medium accuracy. The IBS then reverts from low to medium accuracy requiring the vehicle to be stationary for at least 8 hours or more, which may result in the vehicle failing to revert to ISS action in a short period of time under certain circumstances. For example, when a vehicle is maintained, the negative pole line of the storage battery is pulled out, and then the negative pole line is connected back, the IBS reports low precision, and at this time, the vehicle needs to be stopped for 8 hours to recover the reporting of high precision. So that there are misunderstandings and complaints from customers.

Disclosure of Invention

Accordingly, it is necessary to provide a start-stop control method for an automobile and an electronic device, which solve the technical problem of prohibiting the ISS operation when the battery sensor is low in accuracy in the related art.

The invention provides a method for controlling start and stop of an automobile, which comprises the following steps:

when the precision state of the storage battery sensor is a low-precision state, judging whether the state of the automobile storage battery meets a preset low-precision start-stop condition;

and if the state of the storage battery meets the low-precision start-stop condition, allowing the start-stop function of the automobile, otherwise forbidding the start-stop function of the automobile.

Further, the low-precision start-stop condition is as follows:

the terminal voltage value of the storage battery is larger than a preset target voltage value, the charging and discharging current of the storage battery is within a preset current value range, and the lowest value of the starting voltage of the storage battery is larger than a preset lowest threshold value.

Furthermore, the charging and discharging current of the storage battery is within a preset current value range, and specifically includes:

the charging and discharging current of the storage battery is larger than a preset minimum allowable current value, and the charging and discharging current of the storage battery is smaller than a preset maximum allowable current value, wherein the maximum allowable current value is as follows: and when the charge state of the storage battery is a preset charge state threshold value, the liquid temperature of the storage battery is a preset liquid temperature threshold value, and the charging voltage of the storage battery is the target voltage value, the charging current value of the storage battery is obtained.

Still further, the target voltage value is the minimum generated voltage of the battery when the battery liquid temperature is the engine compartment temperature in the temperature-voltage mode.

Still further, the threshold of the state of charge is 85%, the threshold of the liquid temperature is 25 ℃, and the target voltage value is 13-15 volts.

The invention provides an automobile start-stop control electronic device, comprising:

at least one processor; and the number of the first and second groups,

a memory communicatively coupled to at least one of the processors; wherein the content of the first and second substances,

the memory stores instructions executable by at least one of the processors to enable the at least one of the processors to:

Further, the low-precision start-stop condition is as follows:

When the battery sensor is low in precision, the start-stop function is not directly forbidden, and the start-stop action is judged again by detecting whether the state of the battery meets the low-precision start-stop condition, so that the start-stop action function can still be realized when the battery sensor is low in precision.

Drawings

FIG. 1 is a flowchart illustrating a method for controlling start-stop of a vehicle according to the present invention;

FIG. 2 is a flowchart illustrating a start-stop control method for a vehicle according to a second embodiment of the present invention;

FIG. 3 is a schematic diagram of a state of charge versus charging current curve;

FIG. 4 is a graph illustrating a relationship between a charging voltage and a charging current;

FIG. 5 is a graph illustrating temperature versus charging current;

FIG. 6 is a graph showing a relationship curve between a charging voltage, a liquid temperature of a battery, a charging current and a state of charge;

FIG. 7 is a flowchart of the test mode operation of I85 according to the present invention;

FIG. 8 is a flowchart illustrating a start-stop control method for a vehicle according to a third embodiment of the present invention;

FIG. 9 is a schematic diagram of an example of a start-stop control method for a vehicle according to the present invention;

fig. 10 is a schematic diagram of a hardware structure of an electronic device for controlling start and stop of an automobile according to the present invention.

Detailed Description

The invention is described in further detail below with reference to the figures and specific examples.

Example one

Fig. 1 is a flowchart illustrating a start-stop control method for an automobile according to the present invention, which includes:

step S101, when the precision state of the storage battery sensor is a low-precision state, judging whether the state of the automobile storage battery meets a preset low-precision start-stop condition or not;

and S102, if the state of the storage battery meets the low-precision start-stop condition, allowing the start-stop function of the automobile, otherwise forbidding the start-stop function of the automobile.

Specifically, the present invention is mainly applied to an Electronic Control Unit (ECU) of an automobile. For example, an Engine Management System (EMS) of an automobile, IBS and EMS communicate information via a Local Interconnect Network (LIN) bus. When the accuracy state of the battery sensor is low, step S101 is triggered. The accuracy state of IBS refers to the accuracy of the state of charge information provided by IBS. An IBS precision state may be considered low precision when the SOC error is greater than a certain precision threshold, e.g., when the SOC error is greater than 15%. The accuracy status of the IBS can be determined according to the SOC accuracy status (SOC _ STATE) provided by the IBS. The SOC accuracy states provided by IBS include:

the SOC _ STATE is 00b and indicates that the SOC of the current IBS is in a low-precision STATE;

the SOC _ STATE is 01b and indicates that the SOC of the current IBS is in a medium-precision STATE;

the SOC _ STATE is 10b and indicates that the SOC of the current IBS is in a high-precision STATE;

SOC _ STATE is 11b, invalid value.

Whether to allow the ISS function of the vehicle to be executed is mainly to judge the state of charge of the storage battery, i.e. the value of the electric quantity of the storage battery, and the prior art judges through the information of the IBS, so when the accuracy of the IBS is low, the SOC provided by the IBS is not reliable, and therefore, the performance of the ISS function needs to be prohibited. In step S101, the determination is made directly by the battery status, not only by the SOC value provided by IBS. Therefore, when the battery state meets the low-precision start-stop condition, the start-stop function of the automobile is allowed, so that the ISS function can still be ensured when the automobile is in the low-precision IBS state.

Specifically, the method may further include: when the precision state of the storage battery sensor is a medium-precision state or a high-precision state, judging whether the state of the automobile storage battery meets a preset medium-high-precision start-stop condition or not;

and if the state of the storage battery meets the high-precision start-stop condition, the start-stop function of the automobile is allowed, otherwise, the start-stop function of the automobile is forbidden.

Wherein, the medium and high precision start-stop conditions comprise: and if the SOC value returned by the IBS is larger than the preset state of charge threshold value and the battery health degree (SOF) returned by the IBS is larger than the preset health degree threshold value, the starting and stopping functions of the automobile are allowed, otherwise, the starting and stopping functions of the automobile are forbidden.

Example two

Fig. 2 is a flowchart illustrating a start-stop control method for a vehicle according to a second embodiment of the present invention, which includes:

step S201, when the precision state of the storage battery sensor is a low-precision state, judging whether the state of the automobile storage battery meets a preset low-precision start-stop condition;

step S202, if the state of the storage battery meets the condition that the terminal voltage value of the storage battery is larger than a preset target voltage value, the charge and discharge current of the storage battery is larger than a preset minimum allowable current value, the charge and discharge current of the storage battery is smaller than a preset maximum allowable current value, and the starting voltage minimum value of the storage battery is larger than a preset minimum threshold value, the start and stop function of the automobile is allowed, otherwise, the start and stop function of the automobile is forbidden, and the maximum allowable current value is as follows: when the charge state of the storage battery is a preset charge state threshold value, the liquid temperature of the storage battery is a preset liquid temperature threshold value, and the charging voltage of the storage battery is the target voltage value, the charging current value of the storage battery is the minimum generating voltage of the storage battery when the liquid temperature of the storage battery is the temperature of an engine room in a temperature voltage mode, the charge state threshold value is 85%, the liquid temperature threshold value is 25 ℃, and the target voltage value is 13-15V.

Specifically, it is preferable that:

u _ BATT is more than UT80, I _ BATT is more than or equal to 0.4A and less than I85, VB is more than VBmin, and EMS judges ISS allowed by the storage battery;

u _ BATT is less than or equal to UT80, I _ BATT is less than or equal to 0.4A, I _ BATT is more than or equal to I85, or VB is less than or equal to VBmin, and EMS prohibits ISS.

Meanwhile, when the ISS is actuated to stop, the above determination is not made, and when the engine is started using the starter, the ECM monitors the lowest value voltage value VB of the ECM power supply line.

And U _ BATT is a terminal voltage value sent by the IBS to the EMS current storage battery. I _ BATT is a charging and discharging current value sent by IBS to the EMS current storage battery, I _ BATT is charging when I _ BATT is more than 0, and I _ BATT is discharging when I _ BATT is less than 0. VB is the minimum value of the ECM power line voltage measured by the Engine Control Module (ECM) at each start, i.e., the minimum value of the starting voltage of the battery, with a period of 10 ms. VBmin is the lowest value allowed by the storage battery during starting and can be obtained through calibration. UT80 is the target voltage value for control at a temperature of 80 ℃, preferably UT80 ═ 13.8V. I85 is a charging current value when the SOC is 85%, the battery liquid temperature is 25 ℃, and the charging voltage is UT80, and can be obtained by calibration.

Specifically, as shown in fig. 3, the higher the SOC, the more difficult the charging under the same conditions. When braking, the lowest generating voltage is conservative and is considered to be 13.8V, the lowest liquid temperature of the storage battery is 25 ℃, and the charging current value tested under a certain SOC is the lower limit value. Therefore, I85 is defined as the charging current value at SOC of 85%, charging voltage of 13.8V, and battery liquid temperature of 25 ℃. I85 is the lower limit of the charging current at an SOC of 85%.

As shown in fig. 4, the lower the charging voltage, the more difficult the charging under the same conditions. When braking, the target voltage control mode has three types: the energy recovery mode is 15V, the headlamp mode is 14.2V, and the temperature and voltage control mode is adopted, so that the minimum generating voltage of the storage battery is 13.8V when the target voltage value is that the liquid temperature of the storage battery is 80 ℃ of the temperature and voltage mode of the engine room.

As shown in fig. 5, the lower the temperature is, the lower the activity of the active material in the battery is, and the lower the charging current is than that at high temperature under the same charging voltage, so that the charging becomes difficult. When the vehicle is normally operated, the liquid temperature of the storage battery rises quickly and exceeds the room temperature, so that the liquid temperature of the storage battery is selected to be 25 ℃.

As shown in fig. 6, when the SOC is examined by integrating the charging voltage, the battery fluid temperature, and the charging current curve, the charging voltage becomes lower, the charging becomes lower, and the temperature becomes lower, the charging becomes more difficult, so that it can be seen that the lowest curve, the charging voltage of which is 13.8V at the lowest and the battery fluid temperature is 25 ℃ at the lowest, is the lower limit curve of the charging current, in which the SOC becomes 85% at the position of I85, I85 is the lower limit value of the charging current at which the SOC becomes 85%, and when I _ BATT < I85, the battery SOC > 85% can be conservatively determined, and the minimum SOC necessary for performing ISS is satisfied at this time.

Fig. 7 shows a test pattern of I85, including:

step S701, fully charging a storage battery;

step S702, standing for 1 hour;

step S703, discharging the storage battery to 85%;

step S704, determining whether the storage battery is static for 6 hours or not according to the grouping;

step S705, under the conditions that the temperature is 25 ℃, the constant voltage is 13.8V for charging and the current is limited by 80A, the charging and discharging test of the charging working condition or the discharging working condition is carried out, and the sampling current value of 60 seconds is recorded.

Specifically, for each condition, multiple sample acquisitions are made, and grouping data is employed to discuss threshold rationality.

In the embodiment, the terminal voltage value and the charge and discharge current of the storage battery corresponding to the limit condition of the state of charge of the storage battery are considered, so that the judgment can be directly carried out according to the terminal voltage value, the charge and discharge current and the lowest starting voltage value of the storage battery when the storage battery sensor is in low precision.

EXAMPLE III

Fig. 8 is a flowchart illustrating a start-stop control method for a vehicle according to a third embodiment of the present invention, including:

step S801, when the IBS is SOC low precision, i.e. SOC _ STATE is 00b, execute step S802, otherwise execute step S806;

step S802, judging whether the battery temperature is less than a limit value, if so, executing step S803, otherwise, executing step S809;

step S803, judge whether the terminal voltage value of the storage battery is greater than the limit value, if yes, carry out step S804, otherwise carry out step S809;

step S804, determining whether the IBS charging current is within the range, if so, performing step S805, otherwise, performing step S809;

step S805, judging whether the starting voltage is larger than a limit value, if so, executing step S808, otherwise, executing step S809;

step 806, determining whether the IBS SOC is greater than a limit value, if so, executing step 807, otherwise, executing step 809;

step S807, judging whether the IBS SOF is larger than a limit value, if so, executing step S808, otherwise, executing step S809;

step S808, allowing the ISS to act, and ending;

in step S809, the ISS operation is prohibited, and the process ends.

As an example, as shown in fig. 9:

for state 901, I _ BATT <0, EMS disables ISS;

for the state 902, I _ BATT is more than or equal to I85, and EMS forbids ISS;

for the state 903, I _ BATT is more than or equal to 0.4 and less than I85, the health degree SOF of the battery is more than VBmin, and the EMS judges the ISS allowed by the storage battery;

for state 904, when the ISS is active down, the foregoing determination is not made;

for state 905, I _ BATT <0, EMS disables ISS;

for the status 907, I _ BATT is more than or equal to I85, and EMS forbids ISS;

for the state 908, I _ BATT is greater than or equal to I85, and EMS forbids ISS;

for the state 909, I _ BATT is more than or equal to 0.4 and less than I85, SOF is more than VBmin, and EMS judges ISS allowed by the storage battery;

in the state 910, when the ISS is activated and stopped, the above determination is not performed;

for state 911, SOF is less than or equal to VBmin, EMS disables ISS.

Example four

Fig. 10 is a schematic diagram of a hardware structure of an electronic device for controlling start and stop of an automobile according to the present invention, which includes:

at least one processor 1001; and the number of the first and second groups,

a memory 1002 communicatively coupled to at least one of the processors 1001; wherein the content of the first and second substances,

the memory 1002 stores instructions executable by at least one of the processors 1001, the instructions being executable by the at least one of the processors 1001 to enable the at least one of the processors 1001 to:

The Electronic device is preferably an automotive Electronic Control Unit (ECU). For example, an Engine Management System (EMS) of an automobile, IBS and EMS communicate information via a Local Interconnect Network (LIN) bus. Fig. 10 illustrates an example of one processor 1001.

The electronic device may further include: an input device 1003 and a display device 1004.

The processor 1001, the memory 1002, the input device 1003, and the display device 1004 may be connected by a bus or by another method, and are illustrated as being connected by a bus.

The memory 1002, which is a non-volatile computer-readable storage medium, can be used to store non-volatile software programs, non-volatile computer-executable programs, and modules, such as program instructions/modules corresponding to the start-stop control method of the vehicle in the embodiment of the present application, for example, the method flow shown in fig. 1. The processor 1001 executes various functional applications and data processing by executing nonvolatile software programs, instructions, and modules stored in the memory 1002, that is, implements the vehicle start-stop control method in the above-described embodiment.

The memory 1002 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the automobile start-stop control method, and the like. Further, the memory 1002 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some embodiments, the memory 1002 may optionally include memory located remotely from the processor 1001, which may be connected via a network to a device that performs the vehicle start-stop control method. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.

The input device 1003 may receive input of user clicks and generate signal inputs related to user settings and function control of the vehicle start-stop control method. The display device 1004 may include a display screen or the like.

The vehicle start-stop control method in any of the above method embodiments is performed when the one or more modules are stored in the memory 1002 and executed by the one or more processors 1001.

EXAMPLE five

A fifth embodiment of the present invention provides an electronic device for controlling start and stop of an automobile, including:

at least one processor;

if the state of the storage battery meets the condition that the terminal voltage value of the storage battery is larger than a preset target voltage value, the charge-discharge current of the storage battery is larger than a preset minimum allowable current value, the charge-discharge current of the storage battery is smaller than a preset maximum allowable current value, and the starting voltage minimum value of the storage battery is larger than a preset minimum threshold value, the start-stop function of the automobile is allowed, otherwise, the start-stop function of the automobile is forbidden, and the maximum allowable current value is as follows: when the charge state of the storage battery is a preset charge state threshold value, the liquid temperature of the storage battery is a preset liquid temperature threshold value, and the charging voltage of the storage battery is the target voltage value, the charging current value of the storage battery is the minimum generating voltage of the storage battery when the liquid temperature of the storage battery is the temperature of an engine room in a temperature voltage mode, the charge state threshold value is 85%, the liquid temperature threshold value is 25 ℃, and the target voltage value is 13-15V.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A start-stop control method for an automobile is characterized by comprising the following steps:

2. The start-stop control method for an automobile according to claim 1, wherein the low-precision start-stop condition is:

3. The automobile start-stop control method according to claim 2, wherein the charging and discharging current of the storage battery is within a preset current value range, and specifically comprises:

4. The start-stop control method for an automobile according to claim 3, wherein the target voltage value is a minimum generated voltage of the battery when the battery liquid temperature is an engine room temperature in the temperature-voltage mode.

5. The automobile start-stop control method according to claim 3, wherein the state of charge threshold is 85%, the liquid temperature threshold is 25 ℃, and the target voltage value is 13-15V.

6. An automobile start-stop control electronic device, characterized by comprising:

at least one processor; and the number of the first and second groups,

7. The automotive start-stop control electronic device according to claim 6, characterized in that the low-precision start-stop condition is:

8. The electronic device for controlling start and stop of an automobile according to claim 7, wherein the charge and discharge current of the battery is within a preset current value range, and specifically comprises:

9. The vehicle start-stop control electronic device according to claim 8, wherein the target voltage value is a minimum generated voltage of the battery when the battery liquid temperature is an engine compartment temperature in a temperature-voltage mode.

10. The electronic device for controlling start and stop of an automobile according to claim 8, wherein the threshold value of the state of charge is 85%, the threshold value of the liquid temperature is 25 ℃, and the target voltage value is 13-15 volts.