KR20180013503A - Cooling water state diagnostic apparatus and method for green car - Google Patents

Abstract

The present invention relates to an apparatus and a method for diagnosing a condition of a coolant for an eco-friendly vehicle, and more specifically, for accurately diagnosing a state of the coolant by controlling the speed of an electric water pump which is changed by coolant viscosity according to the outside temperature. According to an embodiment of the present invention, the apparatus for diagnosing the condition of a coolant for an eco-friendly vehicle comprises: a data detector for detecting state data for diagnosing the condition of a coolant; a pump controller for controlling a coolant pump and detecting a driving speed of the coolant pump; and a vehicle controller for checking a gain value according to the measured temperature of an inverter when the state data satisfies a diagnostic execution condition, generating a set speed using the driving speed and the gain value, and diagnosing the condition of the coolant based on the set speed.

Description

TECHNICAL FIELD [0001] The present invention relates to a COOLING WATER STATE DIAGNOSTIC APPARATUS AND METHOD FOR GREEN CAR,

The present invention relates to an eco-friendly vehicle coolant state diagnosing apparatus, and more particularly, to an eco-friendly vehicle coolant state diagnosing apparatus and method capable of accurately diagnosing the state of a coolant water by controlling the speed of an electric water pump varying with the coolant viscosity according to the outside temperature will be.

With global oil price and exhaust gas regulations, eco-friendly policies and fuel efficiency improvements are becoming a key issue in automobile development. Accordingly, companies developing automobiles are making efforts to develop technologies for fuel saving and emission reduction to meet the environment friendly policy and improve fuel efficiency.

Companies developing automobiles are also paying much attention and efforts to develop environmentally friendly vehicles to solve problems caused by exhaust gas and achieve high fuel efficiency.

At this time, the eco-friendly vehicle is a future type vehicle that does not exhaust the exhaust gas. Eco-friendly vehicles include Hybrid Electric Vehicle (hybrid electric vehicle), which is driven by a combination of motor and engine power, and Plug-in Hybrid Electric Vehicle (PHEV), which can be charged with external electricity with a high- And the like.

Environmentally friendly vehicles essentially include power electronic components such as inverters, DC-DC converters, etc. These power electronic components switch large currents and must cool each component for smooth operation.

Methods of cooling these power electronic components and related systems are air-cooled and water-cooled, and in the case of water-cooled systems, the cooling system is large-capacity or when it is necessary to miniaturize the system to be cooled.

Generally, a water-cooled cooling system includes an electric water pump and a separate radiator for cooling power electronic components. Such a water-cooled cooling system accurately diagnoses the lack of cooling water and notifies the driver of the occurrence of a problem in the vehicle such as overheating.

In the conventional case, the method of diagnosing the state of the cooling water judged that the cooling water is insufficient based on the speed variation of the electric water pump according to the cooling water quantity at the start of the vehicle, and informed the driver thereof.

However, in the conventional case, although the cooling water is insufficient when the outside air temperature is low, the speed of the water pump is low due to the viscosity of the cooling water, so that the cooling water deficiency diagnosis and notification are not generated and the vehicle limitation operation and the shutdown may occur.

Also, in the conventional case, although the cooling water is sufficient when the outdoor temperature is high, the viscosity of the cooling water may decrease, and a diagnosis may be made that diagnosis and notification of the lack of cooling water are performed.

The matters described in the background section are intended to enhance the understanding of the background of the invention and may include matters not previously known to those skilled in the art.

An embodiment of the present invention provides an eco-friendly vehicle coolant state diagnostic apparatus and method for diagnosing a coolant state by maintaining the speed of a constant electric water pump regardless of an outside temperature.

An embodiment of the present invention provides an eco-friendly vehicle cooling water condition diagnosing apparatus and method for diagnosing a lack of cooling water by controlling a speed of an electric water pump which is changed by the viscosity of cooling water according to outside temperature.

In one embodiment of the present invention, a data detector for detecting status data for diagnosing a coolant condition; A pump controller for controlling a coolant water pump and detecting a drive speed of the coolant water pump; And a controller for checking the gain value according to the measured temperature of the inverter when the state data satisfies the diagnostic execution condition, generating the set speed using the drive speed and the gain value, and diagnosing the coolant state based on the set speed, The present invention provides an eco-friendly vehicle cooling water condition diagnosing apparatus.

In addition, the vehicle controller can identify a gain table including a gain value matched to each of a plurality of predetermined inverter temperatures, and extract a gain value matched to the inverter measured temperature in the gain table.

Also, the vehicle controller may receive the driving speed from the pump controller for a predetermined time, generate an average speed for the plurality of driving speeds provided, and generate the set speed using the average speed and the gain value .

In addition, the vehicle controller can confirm that the cooling water is in an insufficient state when the set speed is equal to or higher than the reference value, and output the cooling water lack state information through the output unit.

The output unit may further include: a cluster for outputting the cooling water shortage status information; A display unit for displaying the cooling water shortage status information; And a speaker for outputting the cooling water shortage status information by voice.

Further, the eco-friendly vehicle coolant condition diagnosis apparatus may further include a voltage supplier for supplying a drive voltage to the coolant water pump, wherein the vehicle controller can control the voltage supplier to supply a fixed voltage to the coolant water pump.

Also, the vehicle controller can confirm the gain value according to the measured temperature of the inverter when the vehicle speed of the state data is within the set range and the slope value is within the reference range.

According to another embodiment of the present invention, there is provided a method of diagnosing the state of cooling water in an environmentally friendly vehicle, the method comprising: determining whether state data satisfies a diagnostic execution condition; Confirming the driving speed of the cooling water pump and the measured temperature of the inverter when the condition data satisfies the diagnostic execution condition; Determining a gain value according to the measured temperature of the inverter; Generating a set speed using the driving speed and the gain value; Determining whether the set speed is equal to or greater than a reference value; And outputting the cooling water shortage status information if the set speed is not less than the reference value.

The embodiment of the present invention can improve the drivability by diagnosing the state of the cooling water by maintaining the speed of the constant electric water pump irrespective of the outside air temperature, and it is possible to prevent overheating in advance.

In addition, it is possible to accurately diagnose the lack of cooling water by controlling the speed of the electric water pump, which is changed by the cooling water viscosity according to the outside temperature, so that the durability of the power electronic part can be improved and the service life of the power electronic part can be extended.

In addition, effects obtainable or predicted by the embodiments of the present invention will be directly or implicitly disclosed in the detailed description of the embodiments of the present invention. That is, various effects to be predicted according to the embodiment of the present invention will be disclosed in the detailed description to be described later.

1 is a view illustrating an apparatus for diagnosing a state of a cooling water for an eco-friendly vehicle according to an embodiment of the present invention.
2 is a flowchart illustrating a method for diagnosing a state of a cooling water for an environment friendly vehicle according to an embodiment of the present invention.
FIG. 3 is an exemplary view for explaining an average speed generation in the method for diagnosing the condition of an eco-friendly vehicle cooling water according to an embodiment of the present invention.
4 is a diagram illustrating an example of a gain table according to an embodiment of the present invention.
5 is an exemplary diagram for explaining generation of a set speed in the method for diagnosing a state of an eco-friendly vehicle cooling water according to an embodiment of the present invention.
6 is a diagram illustrating an example of a method for diagnosing the condition of an eco-friendly vehicle cooling water according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an operation principle of an embodiment of an apparatus and method for diagnosing an environment-friendly vehicle coolant water according to the present invention will be described in detail with reference to the accompanying drawings and description. It should be understood, however, that the drawings and the following detailed description are exemplary and explanatory of various embodiments for effectively illustrating the features of the present invention. Therefore, the present invention should not be limited to the following drawings and descriptions.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The terms used below are defined in consideration of the functions of the present invention, which may vary depending on the user, intention or custom of the operator. Therefore, the definition should be based on the contents throughout the present invention.

In order to efficiently explain the essential technical features of the present invention, the following embodiments will appropriately modify, integrate, or separate terms to be understood by those skilled in the art to which the present invention belongs , And the present invention is by no means thereby limited.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view illustrating an apparatus for diagnosing a state of a cooling water for an eco-friendly vehicle according to an embodiment of the present invention.

1, an eco-friendly vehicle coolant condition diagnosis apparatus 100 includes a data detector 110, a pump controller 120, a coolant water pump 130, a voltage supplier 140, a temperature sensor 150, a vehicle controller (not shown) 160, an output unit 170, and a storage unit 180.

The data detector 110 detects the state data necessary for diagnosing the state of the cooling water. To this end, the data detector 110 includes a vehicle speed sensor 113 and a tilt sensor 115.

The vehicle speed sensor 113 measures the speed of the vehicle periodically or aperiodically and provides the measured vehicle speed to the vehicle controller 160. [ The vehicle speed sensor 113 can be mounted on a driving wheel of the vehicle to measure the speed of the vehicle.

On the other hand, when the vehicle speed sensor 113 is not provided, the vehicle controller 160 may calculate the vehicle speed based on the GPS signal.

The tilt sensor 115 measures the tilt value of the position where the vehicle is located. That is, the tilt sensor 115 periodically measures the slope value or non-periodically measures the slope value and provides the slope value to the vehicle controller 160. This tilt sensor 115 may be a G sensor.

The pump controller 120 controls the coolant water pump 130. The pump controller 120 detects the driving speed of the cooling water pump 130. Further, the pump controller 120 detects the pump state of the coolant water pump 130. At this time, the pump state indicates the state of the coolant water pump 130 and may be normal or malfunctioning.

The coolant water pump 130 cools the power electronics associated with the operation of the engine and the motor through the coolant. The coolant water pump 130 may be an electric water pump (EWP).

The voltage supplier 140 supplies a voltage for driving the coolant water pump 130 to the coolant water pump 130. The voltage supplier 140 supplies a fixed voltage to the coolant water pump 130 under the control of the vehicle controller 160 in order to diagnose the condition of the coolant. At this time, the fixed voltage represents a voltage for driving the coolant water pump 130, and may be a predetermined value.

The temperature sensor 150 periodically or non-periodically measures the temperature of the inverter (not shown) and provides the measured inverter temperature to the vehicle controller 160. Here, the temperature of the inverter may indicate the temperature of the cooling water.

The vehicle controller 160 includes a data detector 110, a pump controller 120, a coolant water pump 130, a voltage supplier 140, a temperature sensor 150, and a temperature sensor 150, which are components of the environment- And controls the output unit 170 and the storage unit 180.

Specifically, the vehicle controller 160 determines whether the diagnostic execution condition is satisfied based on the state data. The vehicle controller 160 confirms the measured temperature of the inverter measured by the temperature sensor 150 and confirms the gain value according to the measured temperature of the inverter when the condition data satisfies the diagnostic execution condition.

The vehicle controller 160 generates the set speed using the drive speed and the gain value provided from the pump controller 120, and diagnoses the coolant condition based on the set speed.

For this purpose, the vehicle controller 160 may be implemented as one or more processors operating according to a set program, and the set program is a series of steps for performing each step of the eco-friendly vehicle coolant condition diagnosis method according to the embodiment of the present invention As shown in FIG. This eco-friendly vehicle coolant condition diagnosis method will be described in detail with reference to FIGS. 2 to 6. FIG.

The output unit 170 outputs the cooling water shortage status information. Here, the cooling water shortage status information may indicate information for informing the driver that the cooling water is insufficient, and may be composed of voice, graphic, light, letter, and the like.

The output unit 170 includes at least one of a cluster 173, a display unit 175, and a speaker 177.

The cluster 173 represents an instrument panel for informing the driver of information about the vehicle such as the vehicle speed, the engine speed, and the cooling water during the operation of the vehicle.

The cluster 173 outputs cooling water shortage status information under the control of the vehicle controller 160. [

The display unit 175 displays the cooling water shortage status information under the control of the vehicle controller 160. If the display unit 175 is capable of displaying the cooling water shortage state information, the type of the display unit 175 is irrelevant. For example, the display unit 175 may be a navigation system, an audio-video-navigation system (AVN), or the like.

The speaker 177 outputs the cooling water shortage status information by voice under the control of the vehicle controller 160.

The storage unit 180 stores data required by the components of the eco-friendly vehicle coolant condition diagnosis apparatus 100 and data generated by the components of the environmentally-friendly vehicle coolant condition diagnosis apparatus 100.

For example, the storage unit 180 may store the state data detected by the data detector 110, and may store a driving voltage for driving the cooling water pump 130 in the voltage supplier 140. The storage unit 180 may store a gain table for generating the set speed, and may store the cooling water shortage status information.

In addition, the storage unit 180 may store various programs for controlling the overall operation of the environment-friendly vehicle coolant condition diagnosis apparatus 100.

The storage unit 180 provides necessary data according to the request of the data detector 110, the pump controller 120, the voltage supplier 140, the temperature sensor 150, the vehicle controller 160 and the output unit 170 .

The storage unit 180 may be an integrated memory or may be subdivided into a plurality of memories. For example, the storage unit 180 may be a read only memory (ROM), a random access memory (RAM), a flash memory, or the like.

Hereinafter, a method of diagnosing the state of the coolant in the environmentally friendly vehicle will be described with reference to FIGS. 2 to 6. FIG.

FIG. 2 is a flowchart illustrating an eco-friendly vehicle coolant state diagnosing method according to an embodiment of the present invention, FIG. 3 is an exemplary view for explaining an average speed generation in the eco-friendly vehicle coolant state diagnosing method according to an embodiment of the present invention FIG. 4 is a diagram illustrating a gain table according to an embodiment of the present invention, FIG. 5 is an exemplary view for explaining generation of a set speed in the method for diagnosing a state of a cooling water for an environment friendly vehicle according to an embodiment of the present invention, 6 is an exemplary view showing a method for diagnosing the state of the cooling water for an environment friendly vehicle according to an embodiment of the present invention.

Referring to FIG. 2, the vehicle controller 160 is turned on by the driver (S200). That is, the vehicle controller 160 can confirm whether the vehicle is started based on ignition (IG).

The vehicle controller 160 confirms the state data (S210). In other words, the vehicle speed sensor 113 of the data detector 110 measures the vehicle speed and provides it to the vehicle controller 160. The tilt sensor 115 measures the slope value and provides it to the vehicle controller 160. The vehicle controller 160 receives the vehicle speed from the vehicle speed sensor 113 and receives a tilt value from the tilt sensor 115.

On the other hand, the vehicle controller 160 can check the status data to diagnose the status of the coolant water after the first time T1 has elapsed after the start-up, as shown in FIG.

The vehicle controller 160 determines whether the diagnostic execution condition is satisfied based on the state data (S220). Specifically, the vehicle controller 160 determines whether the vehicle speed of the state data is within the set range. Here, the setting range may indicate a range for confirming that the vehicle has stopped.

The vehicle controller 160 determines whether the slope value is within the reference range if the vehicle speed is within the set range. Here, the reference range may indicate a range for confirming that the vehicle is located on the flat ground.

The vehicle controller 160 receives the pump state from the pump controller 120 and determines whether the pump state is normal.

That is, the vehicle controller 160 can confirm that the vehicle is in a stopped state, is located on a flat surface, and that the coolant water pump 130 is normal.

On the other hand, the vehicle controller 160 ends without diagnosing the state of the cooling water if the state data does not satisfy the diagnostic execution condition.

The vehicle controller 160 drives the coolant water pump 130 (S230). Specifically, the vehicle controller 160 controls the voltage supplier 140 to supply a fixed voltage to the coolant water pump 130. That is, the voltage supplier 140 supplies a fixed voltage to the coolant water pump 130 in order to diagnose the coolant under the control of the vehicle controller 160, and the coolant water pump 130 is driven through the fixed voltage.

The vehicle controller 160 generates an average speed based on the driving speed of the coolant water pump 130 (S240). Specifically, the vehicle controller 160 receives the drive speed of the coolant water pump 130 from the pump controller 120. That is, the vehicle controller 160 is supplied with the driving speed from the pump controller 120 for a predetermined time.

The vehicle controller 160 generates an average speed based on the plurality of driving speeds supplied from the pump controller 120 for a predetermined time. 3, the driving speed provided from the pump controller 120 during the second time T2 during which the driving speed is increased after the cooling water pump 130 is driven to the fixed voltage , And generates an average speed based on the driving speed during the third time (T3).

The vehicle controller 160 confirms the inverter measured temperature supplied from the temperature sensor 150 (S250).

The vehicle controller 160 confirms the gain value according to the measured temperature of the inverter (S260). In other words, the vehicle controller 160 identifies a preset gain table. At this time, the gain table includes a gain value matched to each of a plurality of inverter temperatures. For example, the vehicle controller 160 may set the gain table 400 as shown in FIG.

The vehicle controller 160 extracts and confirms a gain value matched to the measured temperature of the inverter in the gain table. That is, when the inverter measurement temperature is low, the vehicle controller 160 increases the viscosity of the cooling water and decreases the driving speed of the cooling water rotating pump to the room temperature. Accordingly, the vehicle controller 160 applies a high gain value. Since the driving speed of the rotary pump increases with respect to the room temperature, a low gain value can be applied.

The vehicle controller 160 generates a set speed based on the average speed and the gain value (S270). That is, the vehicle controller 160 can generate the set speed using the average speed and the gain value as shown in FIG. Thus, the eco-friendly vehicle cooling water condition diagnostic apparatus 100 according to the present invention generates the set speed using the gain value reflecting the viscosity of the cooling water, so that it is possible to eliminate the possibility of misdiagnosis and non-diagnosis due to temperature influence.

For example, when the outside air temperature is lower than the normal temperature and the driving speed of the cooling water pump 130 is measured in the state where the cooling water is insufficient, the reference numeral 610 in FIG. 6 can be shown. At this time, since the driving speed 610 is less than the reference value 620, the vehicle controller 160 can not determine that the cooling water is insufficient. However, since the vehicle controller according to the present invention generates the set speed as shown in reference numeral 630 using the driving speed 610 and the gain value, it can be determined that the cooling water is insufficient.

The vehicle controller 160 determines whether the set speed is equal to or greater than the reference value (S280).

On the other hand, when the set temperature is lower than the reference value, the vehicle controller 160 ends diagnosis of the state of the coolant.

If the set temperature is equal to or higher than the reference value, the vehicle controller 160 controls the output unit 170 to output the cooling water shortage status information (S290) because the cooling water is insufficient. That is, the output unit 170 outputs the cooling water shortage status information to inform the driver that the cooling water is insufficient.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It will be understood that the invention may be varied and varied without departing from the scope of the invention.

100: Diagnosis system of cooling water for eco-friendly vehicles
110: Data detector
113: vehicle speed sensor
115: tilt sensor
120: pump controller
130: Coolant water pump
140: voltage supply
150: Temperature sensor
160: vehicle controller
170: Output unit
180:

Claims (12)

A data detector for detecting status data for diagnosing a coolant condition;
A pump controller for controlling a coolant water pump and detecting a drive speed of the coolant water pump; And
A vehicle controller for checking the gain value according to the measured temperature of the inverter when the state data satisfies the diagnostic execution condition, generating the set speed using the drive speed and the gain value, and diagnosing the coolant state based on the set speed;
And a controller for controlling the temperature of the cooling water. The method according to claim 1,
The vehicle controller
A gain table including a gain value matched to each of a plurality of preset inverter temperatures is obtained and a gain value matching the inverter measured temperature is extracted from the gain table. The method according to claim 1,
The vehicle controller
Wherein the controller is configured to receive the driving speed from the pump controller for a predetermined time, to generate an average speed for the plurality of driving speeds provided, and to generate the set speed using the average speed and the gain value. Diagnostic device. The method according to claim 1,
The vehicle controller
And if the set speed is equal to or greater than a reference value, it is confirmed that the cooling water is in an insufficient state, and the cooling water shortage status information is output through the output unit. 5. The method of claim 4,
The output unit
A cluster for outputting the cooling water shortage status information;
A display unit for displaying the cooling water shortage status information; And
A speaker for outputting the cooling water shortage status information by voice;
Wherein the at least one of the at least one of the at least two of the at least one of the at least one of the at least one of the at least two of the at least one of the at least one of the plurality The method according to claim 1,
Further comprising a voltage supplier for supplying a driving voltage to the cooling water pump,
Wherein the vehicle controller controls the voltage supplier to supply a fixed voltage to the coolant water pump. The method according to claim 1,
The vehicle controller
And a gain value in accordance with the measured temperature of the inverter is confirmed when the vehicle speed of the status data is within the set range and the slope value is within the reference range. A method for diagnosing the condition of cooling water in an environmentally friendly vehicle,
Determining whether the status data satisfies the diagnostic execution condition;
Confirming the driving speed of the cooling water pump and the measured temperature of the inverter when the condition data satisfies the diagnostic execution condition;
Determining a gain value according to the measured temperature of the inverter;
Generating a set speed using the driving speed and the gain value;
Determining whether the set speed is equal to or greater than a reference value; And
Outputting cooling water shortage status information if the set speed is equal to or greater than a reference value;
And a controller for controlling the temperature of the cooling water. 9. The method of claim 8,
The step of confirming the gain value according to the measured temperature of the inverter
Identifying a gain table including a gain value matched to each of a plurality of inverter temperatures; And
Extracting and confirming a gain value matched to the measured temperature of the inverter in the gain table;
And determining whether or not the temperature of the cooling water for the eco-friendly vehicle is within a predetermined range. 9. The method of claim 8,
And confirming the driving speed of the cooling water pump and the inverter measured temperature when the condition data satisfies the diagnostic execution condition
Checking the driving speed of the cooling water pump for a predetermined time if the condition data satisfies the diagnostic execution condition; And
Generating an average speed for a plurality of driving speeds detected during the predetermined time;
And determining whether or not the temperature of the cooling water for the eco-friendly vehicle is within a predetermined range. 11. The method of claim 10,
The step of generating the set speed using the drive speed and the gain value
And generating a set speed using the average speed and the gain value. 9. The method of claim 8,
The step of determining whether the status data satisfies the diagnostic execution condition
Determining whether the vehicle speed of the status data is within a set range; And
Determining whether the vehicle speed is a level based on a slope value when the vehicle speed is within a set range;
And determining whether or not the temperature of the cooling water for the eco-friendly vehicle is within a predetermined range.

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