KR101684096B1 - Apparatus for detecting fault of relay in PHEV - Google Patents

Apparatus for detecting fault of relay in PHEV Download PDF

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Publication number
KR101684096B1
KR101684096B1 KR1020150050565A KR20150050565A KR101684096B1 KR 101684096 B1 KR101684096 B1 KR 101684096B1 KR 1020150050565 A KR1020150050565 A KR 1020150050565A KR 20150050565 A KR20150050565 A KR 20150050565A KR 101684096 B1 KR101684096 B1 KR 101684096B1
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KR
South Korea
Prior art keywords
obc
relay
high voltage
voltage battery
resistance module
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KR1020150050565A
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Korean (ko)
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KR20160121079A (en
Inventor
양진명
이윤식
이제환
이성민
신상철
장한근
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현대자동차주식회사
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Publication of KR20160121079A publication Critical patent/KR20160121079A/en
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    • G01R31/362—
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
    • G01R31/3277—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches
    • G01R31/3278—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches of relays, solenoids or reed switches

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The present invention relates to a voltage sensing device for relay failure detection of an environmentally friendly vehicle optimized for detecting faults of a relay between an OBC (On Board Charger) output and a relay between an OBC and a high voltage battery, wherein an input terminal of the OBC- So that the failure detection of the OBC relay and the OBC-high voltage battery relay can be performed using a single voltage sensing circuit by connecting the first resistance module and connecting the first resistance module with the voltage sensing circuit for detecting the failure of the OBC relay And to provide a voltage sensing device for detecting a failure of a relay of an optimized environmentally friendly vehicle.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a voltage sensing device for detecting a failure of a relay of an environmentally friendly vehicle,

The present invention relates to a voltage sensing device for detecting a relay failure in an environmentally friendly vehicle, and more particularly, to a relay device for relaying an on-board charger (OBC) And a voltage sensing device for detecting faults.

Generally, eco-friendly vehicles (EV, PHEV) use OBC (On Board Charger) for high voltage battery charging. Since the OBC is a single unit connected directly to the high-voltage battery, a voltage sensing circuit is used to connect the DC battery to the high-voltage battery at the time of charging using the DC relay at the output terminal and to detect the DC relay failure at the OBC output terminal.

In case of EV (electric car), OBC is installed in the engine room because the engine is not used. Therefore, even if the collision condition is considered, only one DC relay is required at OBC output terminal.

However, in the case of PHEV (plug-in hybrid car), the OBC is located on the left fender because there is an engine inside the engine room. The left fender uses an additional DC relay between the OBC and the high-voltage battery because the OBC can be burned down even in light crashes, which can expose the high-voltage battery to dangerous situations.

In other words, there are a total of 2 relays because EV applies OBC relay and high voltage battery relay, but in case of PHEV, 3 relays exist by applying OBC relay, high voltage battery relay and OBC-high voltage battery relay .

In the PHEV, the internal relay of the high-voltage battery advances the fault detection on the battery side, and the relay between the OBC output terminal and the relay between the relay and the OBC-high voltage battery must perform fault detection on the OBC side. (A voltage sensing circuit is required for failure detection diagnosis by the number of relays).

In the case of PHEV, a small size OBC is required because of the presence of the engine. If a high-voltage sensing circuit is added, not only the cost increase but also the size increase, and the design quality is lowered.

FIG. 1 is a circuit diagram of an OBC-high voltage battery applied to a conventional PHEV, and FIG. 2 is a circuit diagram of another OBC-high voltage battery of a PHEV according to the prior art.

1, the conventional OBC-high voltage battery circuit includes a voltage sensing circuit 6, a resistance element 7, and a diode (not shown) for voltage sensing for detecting the failure of the OBC relay 5 and the OBC- 8) is applied.

The charging sequence of the OBC (1) is to energize the relays (3) -> OBC - High Voltage Battery Relay (4) -> OBC Relay (5) The resistance element 7 and the diode 8 are connected to the OBC relay 5.

In the conventional OBC-high voltage battery circuit, since the output voltage of the OBC 1 is a high voltage, the high voltage diode 8 and the high power resistance element 7 are applied to the OBC relay 5, Occurs.

So, recently, PHEV is reviewing the technology of adding voltage sensing circuit between OBC-high voltage battery relay and OBC relay.

2, when the voltage sensing circuit 9 is added between the OBC-high voltage battery relay 4 and the OBC relay 5, the resistance between the resistor element 7 and the high voltage diode 8 ), But the size increase problem still occurs.

SUMMARY OF THE INVENTION The present invention has been conceived in view of the above-mentioned problems, and it is an object of the present invention to provide an OBC-high-voltage battery relay device in which a first resistance module is connected to an input terminal of an OBC- It is an object of the present invention to provide a voltage sensing device for detecting the failure of a relay of an environmentally friendly vehicle which is capable of performing fault detection of an OBC relay and an OBC-high voltage battery relay using a voltage sensing circuit.

Accordingly, the present invention provides an OBC-high voltage battery relay configured between an OBC (On Board Charger) and a high voltage battery, and a voltage sensing device for detecting a failure of an OBC relay configured between the OBC-high voltage battery relay and the OBC, A first resistance module to which a voltage is applied when the high voltage battery relay is energized, and a second resistance module to which a voltage is applied when the OBC relay is energized, and the first resistance module or the first resistance module and the second resistance module A voltage sensing device for detecting a failure of a relay of an environmentally friendly vehicle, comprising a voltage sensing circuit for measuring a voltage applied to a synthetic resistor.

According to an embodiment of the present invention, the first resistance module is connected to the input terminal of the OBC-high voltage battery relay, and the second resistance module is connected to the input terminal of the OBC relay. The voltage sensing circuit includes an OBC- The voltage applied to the first resistance module is measured during the ON operation of the relay and the OFF operation of the OBC relay.

According to an embodiment of the present invention, the first resistance module and the second resistance module are connected in parallel, and the voltage sensing circuit includes a first resistance module connected in parallel when the OBC-high voltage battery relay and the OBC relay are turned on, And measures the voltage applied to the second resistance module.

The voltage sensing device for detecting the failure of a relay of an environmentally friendly vehicle according to the present invention is constructed by simply adding inexpensive resistance elements and using a voltage sensing circuit for an OBC relay to perform voltage sensing for detecting the failure of the OBC relay and the OBC- It is possible to minimize the increase in cost due to the additional configuration for detecting the failure of the OBC-high voltage battery relay, and to prevent the increase in size.

1 is a circuit diagram of an OBC-high voltage battery applied to a conventional PHEV
Figure 2 is a circuit diagram of an OBC-high voltage battery of PHEV according to the prior art.
3 is a schematic diagram of an OBC-high voltage battery of an environmentally friendly vehicle according to an embodiment of the present invention.
4 is a circuit diagram for explaining a voltage sensing device for detecting a failure of a relay of an environmentally friendly vehicle according to an embodiment of the present invention.

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

3 is a circuit diagram of an OBC (On Board Charger) and a high-voltage battery mounted on an environment-friendly vehicle, and FIG. 4 is a detailed view showing the main configuration of FIG.

3 and 4, a voltage sensing device for detecting a failure of a relay of an environmentally friendly vehicle according to an embodiment of the present invention includes an OBC (On Board Charger) 10 used for charging a high voltage battery, High voltage battery relay 30 connected between the input terminal 32 of the OBC-high voltage battery relay 30 and the output terminal 12 of the OBC 10 and the OBC relay 40 connected between the output terminal 12 of the OBC 10 and the OBC- In order to sense the voltage, the voltage of the resistance module through which the current flows during the on operation of the relays 30 and 40 is configured to be sensed.

4, a first resistance module 50 is connected between the input terminal 32 of the OBC-high voltage battery relay 30 and the output terminal 44 of the OBC relay 40, and the OBC relay 40, A second resistor module 60 is connected between the input terminal 42 of the OBC 10 and the output terminal 12 of the OBC 10.

At this time, the first resistance module 50 and the second resistance module 60 are connected in parallel, and a voltage sensing circuit 80 is connected to the first resistance module 50 and the second resistance module 60 via a third resistance module 70 connected in series at one end .

That is, the first resistor module 50 has one end connected to the voltage sensing circuit 80 via the third resistor module 70 and the other end connected to the output terminal 44 of the OBC relay 40 and the OBC- And is connected between the input terminal 32 of the high voltage battery relay 30. The second resistor module 60 has one end connected to the voltage sensing circuit 80 via the third resistor module 70 and the other end connected to the output terminal 12 of the OBC 10 and the OBC relay 40). ≪ / RTI >

The voltage sensing circuit 80 includes a first resistance module 50, a second resistance module 60, and a second resistance module 60, to which a current is supplied when the OBC relay 40 and the OBC-high voltage battery relay 30 are turned on, 3 resistive module 70. The voltage applied to the resistor < RTI ID = 0.0 > module 70 < / RTI >

Specifically, the voltage sensing circuit 80 is connected to the composite resistance of the first and third resistance modules 50 and 70 to which current is applied during the on-operation of the OBC-high voltage battery relay 30. [ And the voltages applied to the composite resistances of the first to third resistance modules 50, 60, and 70 to which the current is applied in the ON operation of the OBC relay 40 are measured.

In other words, when the high voltage battery relay 24 and the OBC-high voltage battery relay 30 are in the on state and the OBC relay 40 is in the off state, the voltage sensing circuit 80 controls the first resistance module 50 Voltage battery relay 24 and the OBC-high voltage battery relay 30 and the OBC relay 40 are both turned on during the ON operation of the high voltage battery relay 24 and the OBC- 3 resistance module (50, 60, 70).

Here, the high voltage battery relay 24 is connected between the output terminal 34 of the OBC-high voltage battery relay 30 and the high voltage battery 20.

Power is normally supplied in the order of the high voltage battery relay 24, the OBC high voltage battery relay 30, and the OBC relay 40 during the operation of the OBC 10 for charging the high voltage battery 20. Therefore, when the OBC-high voltage battery relay 30 is turned on, the high voltage battery relay 24 is turned on and when the OBC relay 40 is turned on, the high voltage battery relay 24 and the OBC-high voltage battery relay 30).

The voltage information that senses the voltage applied to the corresponding resistance module during the on operation of each of the relays 24, 30, and 40 is not shown in the drawing, but may be a control board (not shown) connected to the voltage sensing circuit 80 , And the microcomputer detects the failure of each of the relays 30 and 40 based on the received voltage information.

The first resistor module 50 and the second resistor module 60 are formed by connecting a plurality of resistive elements 52 and 62 in series in order to reduce cost and size.

Generally, when a single resistor element having a large power is used, the size and cost of the resistor element are increased compared with the case of using a plurality of resistor elements having relatively small power.

The voltage sensing device for detecting the failure of the relay according to the present invention configured as described above further includes a voltage sensing circuit at the input terminal 32 of the OBC high voltage battery relay 30 to detect the failure of the OBC high voltage battery relay 30 High voltage battery relay 30 is constructed by adding only the resistance element 52 to the input terminal 32 of the OBC-high voltage battery relay 30 and by using the voltage sensing circuit for the OBC relay, the OBC-high voltage battery And performs a voltage sensing function for detecting the failure of the relay 30.

That is, when the OBC-high voltage battery relay 30 is turned on only, the voltage sensing device for detecting the failure of the relay of the present invention is capable of operating the first resistance module 50 (specifically, The voltage sensing for relay failure detection proceeds through the first resistance module 50 and the second resistance module 60 (specifically, the third resistance module 70) And the first to third resistance modules 50, 60, and 70), the voltage sensing for relay failure detection proceeds.

For example, when the serial combined resistance value of the resistance elements 52 constituting the first resistance module 50 is 500 k OMEGA and the series combined resistance value of the resistance elements 62 constituting the second resistance module 60 is 500 k ?, the parallel combined resistance value of the first resistance module and the second resistance module is 250 k ?.

Accordingly, the combined resistance value of the first resistance module 50 and the third resistance module 70 energized in the ON operation of the OBC-high voltage battery relay 30 is 500 k [Omega] + a, and the combined resistance value of the OBC relay 40, The combined resistance value of the first to third resistance modules 50, 60, and 70 that are energized in the on operation of the relays 30 and 30 is 250 k? + A, so that the sensing levels are changed in each case, And 40 can be detected. Here, a is the resistance value of the third resistance module.

That is, the first resistance module 50 connected to the input terminal 32 of the OBC-high voltage battery relay 30 and the input terminal 42 of the OBC relay 40 are connected depending on whether the respective relays 30 and 40 are operated or not The output value of the voltage sensing circuit 80 is changed during the ON operation to the OBC-high voltage battery relay 30 and the ON operation to the OBC relay 40 by the combined resistance value according to the second resistance module 60 Therefore, the failure diagnosis of the two relays 30 and 40 can be performed based on the output value.

Basically, a voltage sensing circuit is required at each relay input to perform fault detection of two relays. However, when two voltage sensing circuits are used, a cost increase of two times occurs.

Therefore, in the present invention, a voltage sensing circuit (voltage sensing circuit for OBC relay) for detecting the failure of the existing OBC relay is used as it is. In order to detect the failure of the OBC-high voltage battery relay 30, The first resistance module 50 consisting of a plurality of resistive elements 52 is added to the voltage sensing circuit for the OBC relay so that a voltage sensing circuit 80 is provided with a resistance Since the difference in the voltage value sensed by the voltage sensing circuit 80 occurs when the respective relays 30 and 40 are turned on by the structure in which the elements are connected in series and in parallel, .

The voltage sensing device for detecting the failure of the relay of the present invention further includes a first resistance module 50 for voltage sensing for detecting the failure of the OBC-high voltage battery relay 30, The cost reduction is maximized and the increase in size does not occur.

In the case of using two voltage sensing circuits as in the conventional case (see FIG. 2), the area of the existing circuit board (PCB) needs to be enlarged, thereby changing the single housing and vehicle layout. However, Only the first resistance module 50 made of the elements can be added, so that the remaining assembly (mounting) space of the circuit board (PCB) can be utilized, so that the size increase and the layout change do not occur.

In general, the fault diagnosis of a relay can be roughly classified into short and open. By applying the voltage sensing device of the present invention as described above, the relay fusion / carpet diagnosis can be performed according to the driving condition and the charging condition of the environment- Lt; / RTI >

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the scope of the present invention is not limited to the disclosed exemplary embodiments. Modifications are also included in the scope of the present invention.

10: OBC
12: OBC output stage
20: High voltage battery
24: High-voltage battery relay
30: OBC - High Voltage Battery Relay
32: Input stage of OBC-high voltage battery relay
34: Output stage of OBC-high voltage battery relay
40: OBC relay
42: Input terminal of OBC relay
44: Output stage of OBC relay
50: first resistance module
60: second resistance module
70: third resistance module
80: Voltage sensing circuit

Claims (4)

An OBC-high voltage battery relay configured between an OBC (On Board Charger) and a high voltage battery, and a voltage sensing device for detecting a fault in an OBC relay configured between the OBC-high voltage battery relay and the OBC,
A first resistance module connected between an input terminal of the OBC-high voltage battery relay and an output terminal of the OBC relay, the voltage being applied when the OBC-high voltage battery relay is energized;
A second resistance module connected between the input terminal of the OBC relay and the output terminal of the OBC and to which a voltage is applied when the OBC relay is energized;
And a voltage sensing circuit for measuring a voltage applied to the composite resistances of the first resistance module or the first resistance module and the second resistance module,
The voltage sensing circuit measures the voltage applied to the first resistance module during the ON operation of the OBC-high voltage battery relay and the OFF operation of the OBC relay, and the first resistance module and the second resistance module during the ON operation of the OBC- And the voltage applied to the composite resistor of the second resistance module is measured.
delete delete The method according to claim 1,
Wherein the first resistance module and the second resistance module each comprise a plurality of resistance elements connected to each other.

KR1020150050565A 2015-04-10 2015-04-10 Apparatus for detecting fault of relay in PHEV KR101684096B1 (en)

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KR101684096B1 true KR101684096B1 (en) 2016-12-07

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KR102058198B1 (en) 2016-12-12 2019-12-20 주식회사 엘지화학 Apparatus for detecting relay fault of battery using parallel circuit for constant power suppy and method thereof

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KR101750073B1 (en) * 2011-10-13 2017-07-03 에스케이이노베이션 주식회사 Circuit for monitoring relay
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