JPH0536235Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to an on-vehicle battery diagnostic device for diagnosing the battery by connecting a load resistor to the battery mounted on the automobile.

[Prior art and its problems] Conventionally, in-vehicle battery diagnostic devices that diagnose batteries installed in automobiles connect a load resistor to the battery and generate a predetermined diagnostic current (a current value approximately three times the battery capacity). ) flows through the load resistor, and the quality of the battery is determined based on the terminal voltage of the battery after a predetermined period of time (approximately 15 seconds) has elapsed since the load resistor was connected to the battery. .

As a load resistor, for example, a carbon pile type variable resistor is used, in which a plurality of carbon plates are sandwiched between a fixed pole plate and a movable pole plate, and the movable pole plate is pressed by turning a rotary knob, and the load is The resistance value of the resistor is variable.

However, if you disconnect the battery and end the diagnosis while the diagnostic current is flowing through the load resistor, when you connect the load resistor to the battery in the next diagnosis, a large current will suddenly flow from the battery to the load resistor. This can cause sparks to flow from the connection terminals, putting workers at risk. In particular, it was unsuitable for use in gas stations that use flammable fuel. Further, there was a risk that the clips would be welded and damaged due to sparks generated at the connection between the battery terminal and the clip, which is the connection terminal.

[Means for Solving the Problems] The present invention addresses these problems and includes a carbon pile type variable resistor in which a plurality of carbon plates are sandwiched between a fixed pole plate and a movable pole plate. An on-vehicle battery diagnostic device for diagnosing a battery by connecting the variable resistor to a battery mounted on an automobile, comprising: a reciprocating member provided to be movable relative to a movable plate of the variable resistor; means for adjusting the pressure applied to the movable electrode plate by operating the advancing/retracting member;
An electromagnetic clutch that uses the battery to be diagnosed as a power source, connects the advancing/retracting member and the pressure adjustment means when energized, and releases the connection between them when the energization is cut off, and a direction in which the movable plate is moved away from the fixed plate. and an energizing means for energizing the movable plate, and is configured to release the pressure on the movable plate by the action of the energizing means when the electromagnetic clutch is released.

[Function] As a result, even if the load resistor is removed from the battery while the diagnostic current is still flowing, the power to the electromagnetic clutch whose power source is the battery to be diagnosed is cut off.
The connection between the advancing/retracting member and the pressure adjusting means is released and the pressure on the movable plate is automatically released by the action of the biasing means, and the resistance value of the variable resistor increases. Even when connected, a large current will not suddenly occur.

[Example] Embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows an external perspective view of the embodiment. Reference numeral 1 denotes a main body that incorporates a circuit board and a load device 11 to be described later, and is equipped with an operation panel 2 and an LCD display 3 on the front. Reference numeral 4 denotes a support body that supports the main body 1 at a height that is easy to operate, and a load cable 5, which is drawn out forward from the back of the main body 1 through the support body 4;
5', a box 9 for housing a rotation sensor 6, a voltage clip 7, and a current sensor 8. 10 is a caster provided at the bottom of the support 4.

FIG. 2 shows an explanatory diagram of the overall configuration of the load device 11. The load device 11 includes a variable resistor 13 connected to a battery 12, a motor 15 housed in a unit case 14, an electromagnetic clutch 16, and a speed reducer 1.
The load driving section 18 consists of 7 parts. The variable resistor 13 has a plurality of carbon plates 19 sandwiched between a movable plate 20 and a fixed plate 20', with insulating plates 21, 21' and an iron plate 22 provided on the outside thereof, and fixed plates provided at both ends thereof. A cylindrical insulator 24 is passed between the plates 23 and 23', and an iron rod 25 installed inside the insulator 24 is fixed with a nut 26 to support the variable resistor 13 consisting of these parts 19 to 22. There is.

27 is an iron rod 28 passed between the electrode plates 20 and 20'
A coil spring wound around the movable electrode plate 20 and 20' is biased in the direction of expanding the space between the electrode plates 20 and 20', and when the pressure on the movable electrode plate 20 is released, the electrode plate 20 is separated from the carbon plate 19 and the variable resistor 13 is disconnected. This is an extension spring that makes the resistance value infinite and returns it to the no-load state. Reference numeral 29 denotes a bolt-shaped square screw nut with a female thread cut, and is fixed to the fixing plate 23 by a nut 30. 31 is a micro switch that detects the no-load position.

Next, the load driving section 18 will be explained.
The motor 15 is a direct current motor capable of forward and reverse rotation, and the drive of the motor 15 is transmitted to a drive shaft 33 of an electromagnetic clutch 16 via a gear section 32.

The electromagnetic clutch 16 includes a bobbin case 35 containing an electromagnetic coil 34 wound around the drive shaft 33 and the drive shaft 3.
When the electromagnetic coil 34 is energized, the drive shaft 33 is magnetized and the contact surfaces of the drive shaft 33 and the armature 36 are connected to transmit the drive of the motor 15 to the armature 36. When the electromagnetic coil 34 is de-energized, the contact surface between the drive shaft 33 and the armature 36 is separated, cutting off transmission from the motor 15 to the armature 36.

The reducer 17 is composed of a first gear 38 held on a shaft 37 serving as the axis of the armature 36, an intermediate gear 40 held on an intermediate shaft 39, and a final gear 42 pivotally supported on a main shaft 41, and reduces the driving force of the motor 15. It is transmitted to the main shaft 41. The main shaft 41 has one end rotatably held in a recess 43 of the unit case 14, and the other end is hollowed out into a cylindrical shape and cut in the diametrical direction.

44 is a square screw shaft connected to the main shaft 41, which corresponds to a member that moves forward and backward with respect to the movable electrode plate 20, and one end is cut in the diametrical direction and fitted into one end of the main shaft 41 to form the cut portion 45. The other end with the square thread cut is screwed into a square thread nut 29, and is formed to be movable in the left and right direction. In addition, the pitch of the square screw shaft 44 is set to be approximately equal to the gap l between the carbon plate 19 and the movable pole plate 20, and one rotation of the square screw shaft 44 causes the movable pole plate 20 to close to the carbon plate 19.
The resistance value of the variable resistor 13 is changed by contacting with the variable resistor 13 and further pressing the movable electrode plate 20.

46 is a torsion coil spring inserted into the periphery of the main shaft 41, and one end is inserted into the notch 45 to connect the main shaft 41 and the square screw shaft 44.
The other end is a stopper 4 formed by bending one end of the fixing plate 47 toward the unit case 14 of fixing plates 47, 47' that fix the unit case 14.
8 and 48', and energizes each screw shaft 44 in a direction away from the movable pole plate 20, that is, energizes the variable resistor 13 in a direction to return it to the no-load state.

Here, the control system of the embodiment will be explained based on FIG. 4. 49 is a control unit, CPU 50, memory 5
1, input/output interfaces 52 and 53, a motor drive circuit 54, a clutch drive circuit 55, and an A/D converter 56, and drives the control section 49 using the battery 12 as a power source. The motor drive circuit 54
Based on signals from the CPU 50, the motor 15 is rotated forward, reversed, and stopped.

The clutch drive circuit 55 is a circuit formed of switching elements such as transistors, and controls energization/de-energization of the electromagnetic clutch 16 based on a signal from the CPU 50.
3 is connected, it is energized and electromagnetic clutch 1
6 is connected to transmit the drive of the motor 15 to the main shaft 41. When the variable resistor 13 and the battery 12 are disconnected in this state, the electromagnetic clutch 16 is disengaged, and the biasing forces of the torsion coil spring 46 and the coil spring 27 move the plates 20 and 20' apart. The insulating state is established, and the variable resistor 13 is returned to the no-load state.

The A/D converter 56 digitally converts the discharge current detected by the clamp-on type current sensor 8 and sends the data to the CPU 50.

Next, the operation of the embodiment will be explained. The terminals of the battery 12 are connected to the pole plates 20, 2 of the variable resistor 13.
Connect the load cables 5, 5' extending from 0',
The CPU 50 starts a program using the battery 12 as a power source.

When performing a battery load test, the electromagnetic clutch 16 is energized via the clutch drive circuit 55 to connect the clutch, and the motor 15 is driven via the motor drive circuit 54 so that a current of three times the battery capacity is applied. is controlled so that the current flows through the variable resistor 13.

When the motor 15 rotates in the normal direction, the information is transmitted to the square screw shaft 44 via the electromagnetic clutch 16, and the square screw of the square screw shaft 44 cuts through the square screw nut 29 and advances, and the tip of the square screw shaft 44 pushes the iron plate 22 and presses the resistor. 13, while motor 1
If 5 is reversed, the resistance value will increase. motor 15
As the motor is driven, the discharge current detected by the current sensor 8 attached to the load cables 5, 5' is compared with the set discharge current (current value three times the battery capacity), and the motor is adjusted so that the two match. 15 is rotated forward, reversed, or stopped to maintain it at a predetermined level.

Further, when the motor 15 rotates normally, the open end of the torsion coil spring 46 comes into contact with the stopper 48, and eventually the torsion of the torsion coil spring 46 increases and energy for restoring the spring 46 is accumulated. When the resistor 13 is removed from the battery 12 while the current value flowing through the resistor 13 is maintained at a predetermined level, the electromagnetic clutch 16 loses power and is disconnected, and the first gear 38 becomes free. The biasing force accumulated in the torsion coil spring 46 causes the square screw shaft 44 to move backward, and the biasing force of the coil spring 27 causes the electrode plate 20 to move away from the carbon plate 19, increasing the resistance value of the resistor 13, resulting in no load. status will be restored.

In this way, even if the variable resistor 13 is disconnected from the battery 12 during diagnosis, it can be automatically returned to the no-load state by the electromagnetic clutch 16 and the torsion coil spring 46. In addition, the current sensor 8
Even if an excessive current is detected in the electromagnetic clutch 16, the problem can be instantly resolved by cutting off the power to the electromagnetic clutch 16.

[Effects of the invention] As described above, according to the invention, even if the battery is accidentally disconnected during battery diagnosis, the power to the electromagnetic clutch is cut off and the connection between the advance/retreat member and the pressure adjustment means is maintained. When the variable resistor is released, the pressure on the movable plate is automatically released by the action of the biasing means and the resistance value of the variable resistor increases, so a large current will suddenly occur even when the battery is connected next time. This significantly reduces the risk of sparks occurring from battery terminals as in the conventional case.

[Brief explanation of the drawing]

FIG. 1 is an external perspective view of an embodiment of the present invention. FIG. 2 is an explanatory diagram of the main parts of the embodiment. Figure 3 is A- in Figure 2.
Cross-sectional view taken at A'. FIG. 4 is a block diagram showing the control system of the embodiment. 12 is a battery, 13 is a variable resistor, 15 is a motor, 16 is an electromagnetic clutch, 19 is a carbon pile, 20 is a movable pole plate, 20' is a fixed pole plate, 27 is a coil spring corresponding to the energizing means, and 44 is a coil spring. A square screw shaft corresponds to a reciprocating member, and a torsion coil spring 46 corresponds to a biasing means.

Claims (1)

[Claims for Utility Model Registration] (1) A carbon pile type variable resistor with a plurality of carbon plates sandwiched between a fixed pole plate and a movable pole plate,
An on-vehicle battery diagnostic device for diagnosing a battery by connecting the variable resistor to a battery mounted on an automobile, comprising: a reciprocating member provided to be movable relative to a movable plate of the variable resistor; A means for operating the advancing/retracting member to adjust the pressure applied to the movable electrode plate and a battery to be diagnosed are used as a power source, the advancing/retracting member and the pressure adjusting means are connected when energized, and when the energization is cut off, the two are connected. an electromagnetic clutch for releasing the movable pole plate, and a biasing means for biasing the movable pole plate in a direction away from the fixed pole plate; An automotive battery diagnostic device that releases pressure. (2) The on-vehicle battery diagnostic device according to claim 1, characterized in that the pressure adjustment means includes a motor capable of rotating in forward and reverse directions.