JPH0390876A - Diagnosic device for on-vehicle battery - Google Patents

Abstract

PURPOSE:To simplify a backup for load and the connection and to attain a measurement of electric leak by interposing a capacitor and a series resistor between a (+) clip of battery and a clip for chassis and connecting the middle point to a (-) clip terminal. CONSTITUTION:Each specified place is clipped by the clips 3, 3', 6 to charge the capacitor C from the battery 2, then the terminal 16 is taken off from the (-) terminal to make the backup for the load 15. Next, the (-) terminal of battery 2 is clipped by the (-) clip 3' to charge again the capacitor C. When a microcomputer 11 is driven by the battery 2 and a start key is pushed, a switch S1 is closed and a diode D1 is short-circuitted thereby a leak current measuring circuit is formed, so an output of a leak current detecting circuit 9 among electric quantities inputted to an A/D converter 8 is measured for the inspection to compare this output with a reference value for decision, then the battery 2 is decided as the normal condition when the measured value is smaller than the reference value, and conversely decided as the fatigued condition when the measured value is larger. After the measurement is finished, the backup is again made for the load 15 by the battery C and the power is supplied to a load Rs, then all of the work are finished.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention is directed to an on-vehicle battery diagnostic device for inspecting the condition of a battery mounted on an automobile and its electrical system.

[Prior art 1] In recent years, with the advancement of electronics in automobiles, the batteries installed in automobiles 41 are constantly being overused, and phenomena such as battery exhaustion are occurring frequently. In view of this situation, a device has been proposed that comprehensively diagnoses a battery and its surrounding electrical system.

Among the diagnostic items for this type of device, leakage current is the sum of the discharge current due to self-discharge of the battery and the load current flowing through the load such as the digital clock connected to the puffer when the encoder is stopped, and the memory of the M/FM tuner. In diagnosis, which determines whether or not a battery is necessary by measuring and comparing the measured value with a judgment reference value, as shown in Fig. 1, the battery e:
After removing the ○terminal T connected to the battery, insert a series resistor between the e terminal of the battery and the chassis of the car, take the voltage between the terminals into the control circuit, convert it to current, and measure the leakage current. I was doing it.

Problem 1 to be solved by the F invention: However, when this device measures leakage current, it is necessary to connect the e-terminal T to form a circuit that inserts a series resistor between the e-terminal of the battery and the chassis of the automobile. If you remove the e-terminal T from the battery, the power supply from the battery to the load Rs (clock, memory, etc.) will be lost, resulting in situations such as the clock stopping and memory loss, and you will have to set it up again. there were.

On the other hand, prepare a sub-battery to back up the load Rs, and before removing the e-terminal T, connect the sub-battery between the ■terminal of the battery and the chassis using the booster cable C, and while removing the ○terminal 1゛. If the load Rs is backed up by a sub-battery, problems such as memory loss will not occur, but it is cumbersome for the operator to prepare and connect the sub-battery, and it may lead to incorrect connections if not done by an experienced worker. There was a fear that this would occur.

SUMMARY OF THE INVENTION An object of the present invention is to solve these problems and to easily back up the load even if the load is temporarily disconnected from the battery, and to simplify the connection work.

[Means for Solving the Problems 1] In order to solve these problems, the present invention includes: ■ inserting a load backup capacitor and a series resistor in series between the clip and the chassis clip; Connect the middle point of the series resistor to the e-clip terminal, insert the clip to the battery's terminal and the chassis clip to the chassis, remove the terminal attached to the e-terminal of the battery, and remove the battery's terminal. The operation of inserting an e-clip to the e-terminal is performed one after another, and the voltage applied across the series resistor is converted into a current value to measure the leakage current, thereby determining the quality of the battery.

[Embodiment 1] An embodiment of the present invention will be described below based on the drawings. 1st
In the figure, 1 is the main body, and the self-ff! IJ u
■■ Clips 3, 3' that hold the ■■terminals of the battery 2 mounted on the L, and the alternator 4 mounted on the car.
An alternator clip 5 that clamps the Bi element and a chassis clip 6 that clamps the automobile chassis ff5G are extended. ■■ A large-capacity backup capacitor C and a diode D for backflow prevention are connected between the ■ O clip terminal avb led from the clips 3 and 3 to the main body 1.
are connected in series, and a diode D2 for backflow prevention is connected in series with the capacitor C, a normally open relay switch S1 for shorting the diode is connected in parallel with the diode D, and the capacitor C and the diode are connected in parallel. A 1Ω series resistor is inserted between the midpoint of D1 and the chassis clip terminal d led from the chassis clip 6 to the main body 1. Additionally, a load resistor R1 and a normally open relay switch S2 are connected in series between the clip terminals a and b. 7 is a battery voltage detection circuit that detects the voltage across the load resistor R1, that is, the battery voltage, and detects the terminal voltage of the battery 2 after the relay switch S is closed and the battery 2 is discharged by the load resistor R1 for a certain period of time; Output to A/D converter 8. 9 is a leakage current detection circuit that detects a leakage current that is the sum of the load current flowing from the battery 2 to the load 15 (clock, memory, etc.) and the discharge current due to self-discharge of the battery 2 itself, and is attached to the e terminal of the battery 2. Remove the terminal 16 and attach the clip 3, 3 to the battery 2.
When the chassis clip 6 is clamped to the vehicle chassis G, the battery 2's ■■ terminal to the load 1.
5. A voltage applied to the series resistor R of the same amount as the leakage current flowing to the e terminal of the battery 2 via the chassis G, chassis clip 6, series resistor R, and relay switch Sl is detected and output to the A/D converter 8. 10 is a charging voltage detection circuit that detects the output voltage of the alternator 4;
Main body 1 from the alternator clip 5 held between the
Detects the alternator output voltage guided to the A/D converter 8 and outputs it to the A/D converter 8. 11 is a microcomputer (hereinafter abbreviated as microcomputer), which is driven by a power source obtained by stepping down the voltage of the battery 2 by a three-terminal regierator 12, and receives input from each detection circuit 7, 9, and 10 via the A/D converter 8. Each electric quantity is data-processed and the diagnosis results are displayed on the operation display section 13. Reference numeral 14 denotes an overcurrent breaker, which is inserted into the line of the e-clip terminal 17, and opens a circuit to protect electrical components when a large current flows due to engine startup, etc. when the main body 1 is in operation.

Next, based on the f52 diagram, especially leakage 1! Regarding the case of current measurement, the operating procedure of the operator using this device, the circuit operation of the main body 1, and the operation flowchart of the microcomputer 11 will be explained in parallel.

First, when measuring the leakage current, the worker
．． 3' Perform preparation work to connect 6 to appropriate locations,
That is, the operator inserts (1) the clip 3 to the terminal (2) of the patch 172 and the chassis clip 6 to the chassis G of the automobile (1), and charges the battery 2 and the recondenser C (2). Next, remove the terminal 16 attached to the EL terminal of battery 2 (2), and connect the capacitor C to the load 15.
06 Next, attach the e-clip 3 to the e terminal of battery 2 (3) and charge capacitor C from battery 2 again. 11 is driven using the battery 2 as a power source, and the operations of steps (1) to (2) are performed.

When the microcomputer 11 starts, the operator waits for the microcomputer 11 to press the start key (not shown), and at this point, the operator G presses the start key to start measuring the leakage current (
4) When detecting the key force of the start key, the relay (
(not shown) through switch S, and diode D
, to form a leakage current measuring circuit (■), then take in the output of the leakage current detection circuit 8 out of the amount of electricity manually inputted to the A/D converter 8 and measure the leakage current: (■),
The operator waits to press the knob key (not shown), and then presses the stop key to wait for the diagnosis result (5).

When the microcomputer 11 detects the human power of the stop key,
Compare the leakage current value I measured in step ■ with the judgment reference value I0, and if the measured value ■ is smaller than the judgment reference value I0, the battery 2 is in a normal state r) Display 1
3, and the measurement value I is the judgment standard value 1.
．． If it is larger than (50m^), the battery 2 is in a fatigued state and there is a possibility that the battery will run out. Therefore, a failure message is displayed on the display 13 to urge replacement of the battery 2, and the inspection of the leakage current is completed.

When the detection is completed, the worker removes the various clips 3゜3', 6
Moving on to the cutting process, first remove the e-clip 3' from the e-terminal of the battery 2 (6).
is attached to the e terminal of the battery 2, and power is supplied from the battery 2 to the load Rs. Next, ■Clip 3. The entire work process is completed by removing each chassis clip 6.

When measuring leakage current in this way, if the wiring is done according to the connection procedure described above, even if the e terminal 16 is removed from the battery 2 era terminal, the load will be maintained by the capacitor C inserted between the battery 2 terminal and the chassis. 15, and power loss of the load 15 is eliminated. Also,
Compared to the conventional method of preparing a sub-battery to back up the load 15, the present invention reduces the number of wiring operations and improves the work fullE rate.

[Effects of the Invention] The present invention is constructed as described above, and after charging the capacitor by connecting the chest clip to the battery terminal and the chassis clip to the chassis portion of the vehicle body, the battery eja
Even if the load is cut off from the battery by disconnecting the e-terminal from the battery's e-terminal before inserting a series resistor for leakage current measurement between the battery and the chassis, the load can be backed up by the charged capacitor. This eliminates problems such as memory loss. Furthermore, the troublesomeness of preparing and connecting a spare battery for load backup as in the conventional case is eliminated, and the connection work can be simplified.

[Brief explanation of drawings]

ff51 is a circuit configuration diagram of a vehicle battery diagnostic device according to an embodiment of the present invention. The second leap is an explanatory diagram of the operation of the same device, and Fig. 3 is an explanatory diagram of the conventional method. 2 is the battery, 3, 3゛ is ■■ clip, 6 is the chassis clip, 15 is the load, 16 is the e terminal, C is the capacitor, R is the series resistor, G is the chassis part Patent applicant Figure 2 Operation procedure Main body 1 Operation diagram 3

Claims (1)

[Claims] Holding the ■■terminals of the battery installed in the car■■
In a vehicle battery diagnostic device that includes at least a clip and a chassis clip that clamps a chassis portion of a vehicle, operates using the battery as a power source, and diagnoses the battery and its electrical system, Insert a load backup capacitor and a series resistor in series, connect the midpoint between the capacitor and the series resistor to the ■clip terminal, connect the ■clip to the ■terminal of the battery, and the chassis clip to the chassis section. , attached to the battery ■ terminal■
The battery is characterized by a control means for sequentially removing the terminal and inserting a clip into the terminal of the battery, converting the voltage applied across the series resistor into a current value and measuring the leakage current. Automotive battery diagnostic equipment.