JPS61170233A - Permissive current value controller for electric apparatus controller - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] Part 1 of the Defense (Industrial Application Field) This invention uses a battery as a drive source to control the allowable current value specified for each of the electrical equipment and the drive device. This invention relates to an allowable current value control device.

(Prior art) Conventionally, for example, in a DC motor for driving a forklift I with a battery, in order to ensure safety, the current value i'1 is determined in advance for the current flowing through the motor. When the current reaches the corrected current value or more, the power supply to the DC motor is cut off and the motor is stopped.

Similarly, for other electrical equipment, the Wf permissible current value is set depending on the equipment to ensure safety.

(Problem solved by the invention) However, this allowable current value does not vary depending on the discharge rate of the battery as the drive source or the load condition from beginning to end, and remains at the initially set value. Ta.

Therefore, since the electrical equipment in question is guaranteed to have an allowable current value that does not change from start to finish, if the battery is flowing a large current to the electrical equipment while the battery's discharge rate is advanced/V, or if the battery is under heavy load. When one or more electrical appliances are operated under load, there is a problem in that the life of the battery is accelerated and other electrical components are adversely affected.

In order to solve the above-mentioned problems, this invention changes the allowable current value of the electrical equipment according to the discharge rate and load condition of the battery, controls the electrical equipment based on the changed allowable current value, and extends the life of the battery. An object of the present invention is to provide a control device for an allowable current value, which can improve the reliability of electrical components.

Structure of the Invention (Means for Solving the Problem) In order to achieve the above objectives, the first invention provides a battery that operates an electrical device, and a current detector that detects the current flowing through the electrical device. and a control means for controlling power supply to the electrical equipment when the current value of the electrical equipment detected by the current detector reaches the allowable current value of the electrical equipment. '3; a battery capacity detection device for detecting a discharge rate of the battery; and a battery capacity detection device configured to vary the allowable current value relative to the discharge rate of the battery. The gist of the present invention is to provide an allowable current value control device in an electric appliance control device, which includes a calculation means for calculating an allowable current value of the electrical equipment with respect to the rate.

Further, a second invention provides a battery for operating a plurality of electrical devices, each current detector that detects the current flowing through each of the electrical devices, and one of the current detectors that detects the current flowing through each of the electrical devices.
An electric machine consisting of a control means that cuts off the power supply to the electric device when the current of the electric device No. 21 reaches the W1 capacity current ll'i'I (iIl') of the electric device.
A control station odor device, a battery customer traffic detection device for detecting the discharge rate of the battery, each operating section detector for detecting the operation (h) of the drive operating device for each of the electrical devices, and each of the electrical devices. The 5'1 capacity current ratio of the battery is changed relative to the discharge rate of the battery at that time and the operation status of the drive operating device of each of the electrical devices. The battery discharge forecast at that time and the drive operation at that time when each of the operation amount detectors detects '3A'
The capacity current (
) A calculation means for calculating rl.

(Function) In the first invention, the calculation means calculates the allowable current value of the electrical equipment based on the discharge rate of the battery of 1, which is detected by the battery capacity detection station, The current value fluctuates depending on the battery's discharge rate.''
Sea urchin rules.

Further, in the second invention, the calculation means calculates the battery discharge rate at the time when the unevenness detection device detects the discharge rate and the operation state of each drive operation device detected by each operation amount detector. Check the allowable current value of each electrical device.
(It is made to vary relative to the electric rate and the operating state of each drive operating device.

(Example of Actual Performance 1 U) An embodiment of a current value control device in which the present invention is embodied in a complete batch tree set F-A-Clear 1 will be described below with reference to the drawings.

FIG. 1 shows a drive circuit of a forklift truck, in which a traveling motor 1 and a cargo handling motor 2 are connected to a battery 5 made of a lead battery through a traveling contactor 3 and a cargo handling contactor 4, respectively. The traveling and cargo handling motors 1 and 2 are single-flow series motors, and the traveling motor 1 drives a drive wheel (A in the figure), and the cargo handling motor 2 drives a liquid pump (I) in a cargo handling hydraulic circuit. (not shown).

A forward contactor 6 and a reverse contactor 7 are connected to the field winding 1F) of the traveling motor 1, and the traveling motor 1 is rotated in forward and reverse directions based on the switching operation of both contactors 6.7. Go forward and backward to clear 1!
It has become so.

Further, a running current detector 8 is connected between the armature 1a of the running motor 1 and the field winding 1b to detect the armature current of the running field 1.

A running switching transistor (hereinafter referred to as a running transistor) 9 is connected in series to the running motor 1, and is switched on based on a running chopper signal SGI, which will be described later, which is input to its base terminal.・It is turned off and the drive motor 1 is controlled. A running bypass contactor 10 is connected between the collectors and emitters of the running transistors 1 to 9.

On the other hand, in the cargo handling motor 2, the cargo handling switching 1 to the range resistor (hereinafter referred to as cargo handling] range resistor) 114 are connected in series to the cargo handling motor 2, and are input to the base terminal of the cargo handling motor 2, which will be described later. Based on the chopper signal SG2 of A bypass container lid 12 is connected.

Note that, similarly to the traveling motor 1, a cargo handling current detector 13 is connected in series to the armature 2a of the cargo handling soil machine 2.
The detector is designed to detect the electric current between the two terminals.

Next, an electric circuit for controlling the operation of each contactor and each transistor in the drive circuit configured as shown in FIG. 2 will be explained.

In FIG. 2, the lever operation amount detection sensor 21
is a potentiometer J, which is installed in the first operation (to detect the operation amount of the lever 22 from the puller 71, and send the detection signal to a digital signal (lift operation amount signal 5G3) via the A/D converter 23. Output.

The tilt lever operation amount detection sensor 24 is composed of a potentiometer, detects the te l'lF ffl of the tilt lever 25 installed in the driver's seat, and sends the detection signal to the A/
A digital signal (Dil 1 to operation star signal SG4) is outputted via the D converter 23. Accelerator pedal operation amount detection sensor → J-26 consists of a potentiometer, detects the operation amount of the accelerator pedal 27 installed in the driver's seat, and converts the detection signal into a digital signal via the A/D converter 23. (accelerator operation amount signal 5G5) to change the output.

The running current detector 8 charges two capacitors via a resistor 28 with a detection current relative to the armature current of the running motor 1. Then, a charging voltage having a voltage value relative to the armature current is outputted as a digital signal (running current value signal 5G6) via the A/D converter 30. Further, the cargo handling current detector 13 charges a capacitor 32 with a detection current relative to the armature current of the cargo handling motor 2 via a resistor 31. Then, a charging voltage having a voltage value relative to the electric current is outputted as a digital signal (cargo handling current m signal S G 7 ) via the A/D converter 30.

The capacity detector ff'i 33 detects the discharge rate of the battery 5 and sends the data signal (discharge rate signal S G B ) of the current discharge rate of the battery 5 to the next stage central processing via the △10 converter 30. The output signal is output to a device 34.

A central processing unit (hereinafter referred to as C
A read-only memory (PU) 34 inputs each of the signals SG3 to SG8, and a read-only memory (R).
It operates according to the control program 1-1 stored in the program memory 35 consisting of OM>.

The CP (j37'I is the value of each lever 22.25 at that time based on the lift and tilt operation amount signals SG3.SG4).
Calculate the operating amount of J and the accelerator operating foil coefficient SG.
5, the pedal depression operation amount at that time is calculated. This determination is made based on the data of the operation amount for each signal, which is stored in advance in the program memory 35 in addition to the control program.

And CI) lJ34 is each lever 22 determined.
．． a cargo handling control signal for controlling the drive of the cargo handling motor 2 based on the operating amount of the accelerator pedal 25; A programmable timer (
(hereinafter referred to as PTM) 36.

The PTM 36 outputs a frequency-modulated driving pulse signal based on the driving control signal from the CPU 34, that is, according to the operation amount of the accelerator pedal 27. Based on this, a frequency-modulated pulse signal for cargo handling is output in accordance with the amount of operation of the lift lever 22 and tilt lever 25.

This running pulse signal is output to the transistor 38 via the AND circuit 37, and the transistor 38
By turning on and off, the hopper signal SG1 is outputted to the base terminal of the i'1itj river 1-run star 9. Further, a pulse signal for cargo handling is outputted to a transistor 40 via an AND circuit 39.
To turn on and off the transistor 40, a chopper (J) is connected to the base terminal of the cargo handling transistor 11.
It is designed to output H No. SG 2.

Also, the CPIJ34 calculates the armature current (average value) of the running fj and cargo handling motors 1 and 2 at that time, respectively, based on the running current liiIl (g) and the cargo handling current value signals SG6 and SG7. It has become.

This determination is performed for each signal SG6. It is determined based on the data of each armature current for SG7.

Further, the CPU 34 inputs the discharge rate No. 15 SG8 and calculates the allowable current value (md) of the traveling motor 1 and the allowable current value Tmp of the cargo handling motor 2 based on the current discharge rate of the battery 5. In this example, CP As the process progresses, the allowable current value (1 md, I ml) is lowered.

Furthermore, the CPU 34 determines the state of the traveling and cargo handling motors 1 and 2 based on the determined armature current (average value) of the traveling and cargo handling motors 1 and 2 at that time. In other words, whether the forklift is only moving or not
It is designed to determine whether the vehicle is carrying out only loading work, or whether traveling and cargo handling work are being carried out at the same time.

When traveling and cargo handling are being performed simultaneously, the CPU 34 calculates the current discharge rate of the battery 5 and the heavy load on the battery 5 (in this embodiment, traveling and cargo handling are being performed at the same time). Considering each motor 1, 2
The allowable current value of 1 md, I n+1 is calculated as the pupil.

In this example, each allowable current value md
, ■mp will be shown by the broken line in Figures 3 and 4.''
, the CPU 34 calculates each allowable current value I +nd, I
Perform mp. In other words, the allowable current 1i1i 1 md of the traveling motor 1 is generally smaller than the allowable current 1il-11md of the traveling only 1, r shown by the solid line in FIG. 3, and the allowable current value imp of the cargo handling motor 2. is battery 5
After the discharge rate reaches a predetermined discharge rate, J is set to be smaller than the allowable current value tmp of IN for cargo handling only, as shown by the solid line in FIG.

At that time, each allowable current value Imrl, 1ml] of Z is calculated, and C1) IJ 3 /I is calculated as each allowable current value 1md.
, lllID is output to the D/A converter 41.

1]/△ converter 41 converts a reference signal based on the allowable current value 1 md into an analog signal (voltage) and outputs it to the positive input terminal of the comparator sorter 42 as a reference voltage for running, and also converts it into an analog signal (voltage) based on the allowable current value Imp. Mt'? for cargo handling by converting the base signal of λ into an analog signal. This traveling reference voltage, which is set based on the allowable current value 1111 (l), is outputted to the positive input terminal of the comparator 43 when the armature current of the traveling motor 1 reaches the allowable current value 1111d of A. When this happens, it matches the detection signal (detection voltage) output to the negative input terminal of the comparator 42 based on the detection result of the running current detector 8. Then, the armature of the running motor 1 When the current exceeds the allowable current value imd and the detection voltage becomes greater than the running reference voltage, the output of comparator 2 is reversed from positive potential (H level) to zero potential (L level), The signal is outputted to the AND circuit 37 via the one shot 1 to the circuit 44.

Therefore, when the armature current of the running Tanabata 1 flows in excess of the allowable current value 1111d at that time, the frequency-modulated running pulse signal output from the PTM 36 in the AND circuit 37 is tifl, +t. ,the result,
The running transistor 9 is turned off, and power supply to the running motor 1 is cut off.

Similarly, when the armature current of the cargo handling motor 2 reaches its allowable current value Imp, the cargo handling reference voltage set based on the cargo handling current value [1] is determined based on the cargo handling current detector 13. Based on the detection result, it matches the detection voltage output to the negative input terminal of the comparator 43. Then, the armature current of the cargo handling motor 2 is the allowable current f at that time.
When the detected voltage becomes weaker than lIIImp, the output of the comparator 3 is inverted from L level to L level, and the L level signal is passed through one shot 1 to circuit 45 to the above. It is output to the AND circuit 39.

[Accordingly, when the armature current of the cargo handling motor 2 flows in excess of the current capacity current Imp, the frequency-modulated cargo handling pulse signal output from the PTM 36 in the AND circuit 39 is As a result, the cargo handling transistor 11 is turned off, and the power supply to the cargo handling motor 2 is interrupted.

Note that the working memory 46 is a readable and replaceable memory (RAM) that temporarily stores the operation results when the CPU 34 processes the oil cylinder at each time. There is.

Next, the operation of the permissible current controller configured as described above will be explained.

While the fork rears 1~ are traveling without performing cargo handling work, the CPU 34 outputs a traveling control signal based on the operation amount of the accelerator pedal 27 to the PTM 36. PTM3
6+ outputs a frequency-modulated pulse signal for driving based on this driving control signal, outputs a chopper signal SGI to the driving transistor 9, and drives the driving motor 1 to a speed corresponding to the operating amount of the accelerator pedal 27. Control.

Note that since the lever 22 or the tilt lever 25 to the load handling motor 2 is not operated, the chopper (ig S G 2) is not output to the load handling transistor 11, and the load handling transistor 1 to transistor 11 is not output. is in an off state, and the cargo handling motor 2 is stopped.

On the other hand, the CPU 34 executes the calculation processing operation of the allowable current values 1md, 1m1) of the travel and cargo handling motors 1 and 2 at that time based on the discharge rate signal S G 8 from the capacity detection device 33. The CPU 34 determines based on the running current value signal SG6 that only running is being performed at this point 04, and calculates the capacity current slope Imd of the running motor 1 based on the discharge rate of the battery 5 at that time.

Then, CI] LJ 34 is the calculated current vessel 1
A reference voltage based on the md is output to the comparator 1 node 42 via the D/A converter 41.

On the other hand, when carrying out cargo handling work with the forklift stopped, CI] LJ 34 is the same as above, when the allowable current of 1 m I mp for the cargo handling motor 2 is the battery at that time! : Based on the discharge rate of 5 (), the reference voltage based on this calculated allowable current value Imp is D,
−' Output J to comparator 43 via A converter 41
Ru.

On the other hand, if driving and cargo handling work are not being carried out on the opposite side, C
The PU 34 outputs a driving control signal based on the operating amount of the accelerator pedal 27 to the single M36, and also outputs a cargo handling control signal based on the operating amount of the respective levers 22 and 25 to the PT-.
Output to M36.

The PTM 36 outputs a frequency-modulated pulse signal for driving based on this driving control signal, and outputs Chotsupa 1 answer SG1 to driving 1 to transistor 9, and changes the driving Sat-Yu 1 to the operating amount of the accelerator pedal 27. Drive control i to the corresponding speed
Illz-ru. At the same time, the PTM 36 outputs a frequency-modulated cargo handling pulse signal based on the cargo handling control signal, and sends a chopper signal S G 2 to the cargo handling transistor 11.
is output to drive and control the cargo handling motor 2 to a speed corresponding to the amount of operation of each lever 22.25.

On the other hand, CI) IJ 34 is based on the discharge rate signal SG8 from the capacity detection device 33, and the allowable current value of the traveling and cargo handling motors 1 and 2 at that time is 1 md, as described above.

Execute Imp calculation processing operation. The CPU 34 generates a traveling and cargo handling current value signal SG6. Based on SG7, it was determined that traveling and cargo handling work were being carried out at the same time.
Allowable current value 11116 of the traveling and cargo handling motors 1 and 2 based on the discharge rate of the battery 5 at that time and the fact that traveling and cargo handling work are being performed simultaneously. Calculate each Imp.

Then, the CPU 34 calculates each allowable current value 1md.
, imp is output to each comparator 42, 43 via the D/A converter 41.

As described above, in this embodiment, as the discharge rate of the battery 5 progresses, the speed of the travel motor 1 and the cargo handling motor 2 increases
9 capacity current value 1md, l1llrl is lowered as indicated by the solid line M- in Figures 3 and 4, so that the maximum power consumption of the battery 5 in the state where the discharge rate of the battery 5 is advanced is lowered. This can extend the life of the battery 5.

In addition, in this embodiment, when cargo handling work and traveling are performed simultaneously, that is, when the battery 5 is under a heavy load, the traveling-E - The allowable current value Tmd, 1m1) of the load handling motor 1 and the cargo handling motor 2 is shown by the broken line in Figures 3 and 4.
Since the voltage is varied in this manner, the life of the battery 5 can be greatly extended, and the reliability of the electrical components can be improved.

In the above embodiment, when traveling and cargo handling work are carried out at the same time in order to improve work efficiency by prioritizing cargo handling work, the allowable current 1i['j1m of the cargo handling motor 2]
When the discharge rate of the battery 5 is not progressing, p is set to be the same value as when only cargo handling is being carried out, but even if it is lowered overall like the R11 capacity current of the traveling motor 1, 1 md. good.

Further, in the above embodiment, the traveling motor 1 and cargo handling motor 2 of F4-Cleanor 1 were explained, but it is also possible to apply this to other electric luxury molding.

Roughly speaking, in the above embodiment, the allowable current value with respect to the discharge rate is shown in FIGS. 3 and 4, but this may be changed as appropriate.

Effects of the Invention As detailed above, the present invention has excellent effects of extending the life of the battery and improving the reliability of electrical components.

[Brief explanation of the drawing]

Fig. 1 is a drive circuit diagram of forklifts 1~, Fig. 2 is an electric block circuit diagram of an allowable current value control device, and Fig. 3 is a diagram for explaining the allowable current value of the travel motor with respect to the discharge rate of the battery. , FIG. 4 is a diagram for explaining the allowable current value of the cargo handling motor in response to the discharge rate of the battery. In the figure, 1 is the motor for traveling, 2 is the motor for cargo handling, 5 is the battery, 8 is the current detector for traveling, 9 is the traveling 1 to transistor, 11 is the cargo handling 1 to transistor, 13 is the current detector for cargo handling. , 21 is a lift lever operation detection sensor, 22 is a beam 71 to lever, 24 is a tilt I-lever operation amount detection sensor, 25 is a tilt lever, 26 is an accelerator pedal operation amount detection sensor, 27 is an accelerator pedal, and 33 is a lift lever. Detection equipment, 34 CPU, 35 program memory, 42
．． 43 is a ] comparator. Patent applicant: Toyota Industries Corporation, Meidensha Co., Ltd.

Claims (1)

[Scope of Claims] 1. A battery that operates an electrical device; a current detector that detects a current flowing through the electrical device; and a current value of the electrical device detected by the current detector at that time. An electrical equipment control device comprising: a control means that cuts off power supply to the electrical equipment when an allowable current value is reached; a battery capacity detector that detects the discharge rate of the battery; and a battery capacity detector that detects the discharge rate of the battery; and calculation means for calculating an allowable current value of the electrical equipment for the current battery discharge rate detected by the battery capacity detection device so as to vary it relative to the discharge rate of the electrical equipment controller. Value control device. 2. The permissible current value in the electrical equipment control device according to claim 1, wherein the calculation means calculates the permissible current value so as to relatively decrease the permissible current value as the discharge rate of the battery progresses. Control device. 3. A battery that operates a plurality of electrical devices, each current detector that detects the current flowing through each of the electrical devices, and the current value of the electrical device at the time detected by each of the current detectors. An electrical equipment control device comprising: a control means for cutting off power supply to the electrical equipment when the allowable current value of the electrical equipment is reached; a battery capacity detection device for detecting the discharge rate of the battery; an operation amount detector for detecting the operation amount of the device; an indexing means for determining the load on the battery based on the detection signal from the drive state detector; The current battery discharge rate detected by the battery capacity detection device and the allowable current value of each electrical device for the current load determined by the determining means are varied relative to the current discharge rate and the load of the battery. An allowable current value control device in an electrical equipment control device, comprising a calculation means for calculating. 4. The drive state detector is provided for each electrical device and detects the drive state of each electrical device, and the determining means uses each drive state detector to determine whether or not each electrical device is being driven. According to claim 3, wherein the allowable current value of each electric device is calculated based on the discharge rate of the battery detected by the capacity detection device and the presence or absence of driving of each electric device determined by the determining means. Allowable current value control device for electrical equipment control devices. 5. Claim 4, wherein the drive state detection device is a current detector that detects the current flowing through each of the electrical devices.
Allowable current value control device in the electrical equipment control device described in 2.