JP2678906B2 - Electric vehicle power control device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply control device for an electric vehicle, and particularly to an electric vehicle that not only controls the supply of electric power for driving a motor but also drives the electric power for operating the control device. The present invention relates to a power supply control device. [Prior Art] A conventional power supply control device for an electric vehicle is shown in FIG. Of these, the one shown in FIG. 1A is a type using a low power consumption type CMOS / IC flip-flop. To explain its operation, flip-flop 200
Is constantly applied with the electric power V _cc, and when the relay coil 202 is energized, the contact 204 turns “ON (O
N) ”, and the flip-flop 200 is in a self-holding state. The reset of the flip-flop 200 is performed by a reset pulse output after the timer circuit 206 measures a predetermined time. Next, the one shown in FIG.
It is a type that uses 300 and self-holds using a bipolar contact relay. [Problems to be Solved by the Invention] However, of the above-described conventional techniques, the former is the flip-flop 200 even if the power consumption is small.
Operating power for the integrated circuit (hereinafter referred to as "IC")
The power consumption in this part cannot be ignored, and _Vcc is still applied. Further, in the latter case, a contact having two or more poles is required to establish the self-holding state, which causes a cost disadvantage. [Object of the invention] The object of the present invention is made in view of the above points,
Another object of the present invention is to provide a power supply control device for an electric vehicle that has a simple structure to further reduce unnecessary power consumption and is advantageous in terms of cost. [Means for Solving Problems] In a power supply control device for an electric vehicle, which controls the supply of electric power from a power source to a drive unit that controls the supply of drive power to a motor based on the operation of an accelerator unit,
A switching device capable of connection and start instruction for supplying power from the power source, and supply of operating power of the connected power source to each means and supply of driving power from the power source to the motor driving means. , And a power supply unit that stops the power supply based on the supply stop instruction. Supply control means for issuing a supply start instruction to the power supply means on the basis of the electric power supplied from the power source through the switch device when the start instruction is given to the switch device; A configuration is adopted in which a stop control means is provided for detecting that the state has continued for a certain period of time and issuing a supply stop instruction to the power supply means. Further, the power supply means stops the supply of all the operating power and the driving power including the operating power to the power supply means by the supply stop instruction. Further, the start instruction of the switch device is
It is automatically restored. [Operation] According to the present invention, both the operating power for driving the control device and the driving power for driving the motor are respectively supplied based on the start instruction of the switching device, and are respectively stopped when the accelerator is stopped. . Therefore, the unnecessary consumption of electric power in a state where there is no start instruction or after the accelerator is stopped is favorably reduced. The relay uses a minimum number of contacts and does not require a seating sensor or the like. [Embodiment] An embodiment of the present invention will be described below with reference to the accompanying drawings. First, the basic configuration of the present invention will be described with reference to FIG. In this figure, a power supply 100 that supplies motor drive power for an electric vehicle and operating power for a control device is connected to a switch device 102 on the one hand and to a power supply means 104 on the other hand. The power supplied via the switch device 102 is for the operation of the control device, and the power supply means 104 to the accelerator means 106, the driving means 108, and the supply control means 1
10, each is supplied to the stop control means 112. The electric power supplied from the power supply 100 to the electric power supply means 104 is for driving the motor 114 and is supplied to the drive means 108. The switch device 102 is capable of connection and start instruction for supplying operating power from the power supply 100. The power supply means 104 supplies power based on a supply start instruction input from the supply control means 110, and stops power supply based on a supply stop instruction input from the stop control means 112. The accelerator means 106 outputs an accelerator drive operation amount by an operator as an electric signal. When there is a start instruction in the switch device 102, the supply control means 110 issues a supply start instruction to the power supply means 104 based on the power supplied from the power supply 100 via the switch device 102 at the time of the instruction operation. It is a thing. The stop control means 112 detects that the accelerator means 106 has been stopped for a certain period of time, and issues a power supply stop instruction to the power supply means 104. Explaining the operation of this basic device, neither the operating power nor the driving power is supplied to each unit until the operator operates the switch device 102. When the operator operates the switch device 102 to instruct start, the supply control means 110 instructs the power supply means 104 to supply electric power to each unit,
Driving power is supplied. When the electric vehicle is stopped, the accelerator is not operated for a long time, and therefore the stop control unit 112 gives a power supply stop instruction to the power supply unit 104. by this,
Supply of operating power and drive power to each unit is stopped. Next, one embodiment of the present invention will be described in more detail with reference to FIGS. 2 and 3. The configuration is shown in FIG. 2 and the operation is shown as a time chart in FIG. In FIG. 2, the positive side of the battery 10 for driving the electric vehicle is connected to the common terminal side of the switch 12. This switch 12 is used for "START" and "OFF (OF
It has three switching terminals of “F)” and “ON”, and among these, the “OFF” terminal is connected to a charger or the like not shown. On the other hand, the "ON" terminal is connected to the relay coil 1
4, connected to a transistor 18 for driving a relay via a parallel circuit of a diode 16, and on the other hand, connected to a transistor 22 for driving a three-terminal regulator 20. Further, the “START” terminal is connected to the power input side of a D-type flip-flop (hereinafter, referred to as “F / F”) 28 via a resistor 24 and a diode 26, and a Zener diode 30 and a capacitor 32 are respectively connected. It is directly connected to ground. In addition, the voltage applied to the [START] terminal is
It is divided by and input to the set terminal side of F / F28. The resistors 34 and 36 have a value of R _34.
≪ It is configured to be R ₃₆ . A transistor 38 for surely performing a reset operation is connected to the set terminal side. The base resistor 40 side of this transistor 38 is grounded via a resistor 42,
They are connected to the output side of the timer 46 via the diode 44 and to the reset terminal side of the F / F 28 via the resistor 48, respectively. Next, the collector resistance 50 side of the transistor 22 for driving the three-terminal regulator 20 described above is connected to the three-terminal regulator 20 on the one hand and grounded via the capacitor 52 on the other hand. Further, a voltage obtained by dividing the voltage applied to the “ON” terminal of the switch 12 by the resistors 54 and 56 is applied to the base side, and the resistor 56 is connected to the transistor 58. . The Q output terminal side of the F / F 28 is connected to the base side of the transistor 58 via resistors 60 and 62 connected in series and parallel. On the other hand, on the output side of the above-mentioned three-terminal regulator 20,
The capacitor 64 is connected to the ground. Next, the Q output side of the F / F 28 is connected to the base side of the transistor 18 via resistors 66 and 68, respectively. Resistance 66
A series circuit of a resistor 70 and a diode 72 is connected in parallel with the capacitor, and a capacitor 73 is further connected between the capacitor 73 and the ground. Next, the signal output side of the accelerator 74 is connected to the plus side input terminal of the comparator 76 on the one hand, and is connected to the drive circuit 80 via the control circuit 78 on the other hand. The output side of the drive circuit 80 is connected to the drive motor 82. A resistor 8 is connected to the negative input terminal of the comparator 76 described above.
The voltage divided by 4,36 is applied, and the output side thereof is connected to the timer 46 via the diode 88. Further, the drive circuit 80 has a contact point at which the positive side of the battery 10 is driven by energizing the relay coil 14.
Connected through 90. Further, the operating voltage V _cc that is the output of the above-mentioned three-terminal regulator 20 is F / F 28, timer 46, accelerator 74, control circuit 7
8 is applied to each of them, and is also applied to the output side of the comparator 76 via the resistor 92. Next, the operation of the above apparatus will be described with reference to the time chart of FIG. First, the operator of the electric vehicle is operated to the "ON" switch 12 from "OFF" (Fig. (E) refer to t _1), a battery
The voltage V _{B of} 10 is applied to the relay coil 15 and the three-terminal regulator controlling transistor 22, respectively. However, in this case, no current flows because neither of the transistors 22 and 18 is “ON”. In detail, an extremely small leak current flows in each transistor, but each is sufficiently negligible. Next, when the operator operates the switch 12 to "START", the common terminal of the switch 12 is connected to the "START" terminal, but in this position, the contact is in the state of automatic reset and the operator releases the hand. As a result, it will return to the "ON" position again. By this operation, a pulse-shaped set signal as shown in FIG. 7F is input to the “START” terminal at time t ₂ . At this time, the battery voltage “V _B ”> the operating voltage “V _cc ”, and since it is necessary to apply V _cc to the F / F 28, the Zener diode 30 adjusts the voltage. Also, noise from the battery 10 and switch 12
4, it will be removed by the action of a filter that is equivalently constructed by the capacitor 32. The set signal is supplied to the set terminal of the F / F 28 as a trigger and, at the same time, as the power source of the F / F 28. As a result, the Q output terminal becomes the logical value "H" (see (1) in the same figure), and the transistor 58 becomes conductive and becomes "ON". Further, when the transistor 22 is also turned “ON”, the three-terminal regulator 20 is operated, and the battery voltage V _B supplied from the battery 10 via the switch 12 returning to the “ON” terminal is the resistance 50. Will be applied to the three-terminal regulator 20 via. As a result, the operating voltage V _cc for the control circuit is supplied to each part such as the accelerator, so that the entire control circuit becomes in the operating state (see FIG. 7G). At this time, the timer 46 starts counting the time because the output of the comparator 76 is the theoretical value "L" (see (C) in the figure). Next, even if the set signal shown in FIG. _7F is not supplied due to the supply of the operating voltage V _cc , F /
The output of F28 remains the logical value "H" and does not change, and the set state is maintained. On the other hand, the Q output of the F / F28 is at the same time as the transistor 1
Although it is also input to 8, it is performed after the delay of the time Td by the delay circuit configured by the resistor 66 and the capacitor 73 . That is, after a delay of time Td, the transistor 18 becomes “O
"N", the relay coil 14 is energized, and the contact 90
Becomes “ON”. As a result, the main power or the drive power V _DR is supplied to the drive circuit 80 (see (H) in the figure). As described above, the reason for providing the delay time Td from the application of the operating voltage V _{cc to} the application of the drive power V _DR is that the drive circuit is provided until V _cc is reliably applied and the control circuit 78 operates stably. This is because the drive power V _DR is not supplied to 80 to prevent malfunction. In the operation state of the control device as described above, when the operator operates the accelerator 74, a voltage signal corresponding to the degree is output as shown in FIG. The accelerator signal V _Acc is input to the control circuit 78 on the one hand, and the corresponding control signal is output from the control circuit 78 to the drive circuit 80 to drive the drive motor 82. That is, the electric vehicle travels in response to the accelerator operation by the operator. On the other hand, the accelerator signal V _Acc is input to the comparator 76,
It is compared with the comparison voltage Vr. This comparison voltage Vr indicates the lowest level at which the drive motor 82 is not driven. Therefore, only when the accelerator 74 is operated more than the minimum amount corresponding to the comparison voltage Vr, the comparison signal Vr having the logical value "H" is generated.
Will be output from the comparator 76 (see FIG. 7B). The comparison signal Vr is transmitted to the timer 46 via the diode 88.
When it is input to, the predetermined time measurement is stopped and the counter is reset (see time t _{3 in} FIG. 7C). Next, at time t ₄ , the operator operates the accelerator 74 to stop the electric vehicle, and the accelerator signal V _ACC
Becomes equal to or lower than the comparison voltage Vr (see FIG. 7A). Therefore,
The output of the comparator 76 becomes a logical value "L" (see FIG. 7B), and the timer 46 starts counting again (FIG. 7G).
reference). The above operation is repeated corresponding to the accelerator operation by the operator. When the electric vehicle has passed a predetermined time Δt is stopped, i.e. (see FIG (C) t ₅₎ when it is determined that the accelerator stop, reset signal V _TR of the logical value "H" from the timer 46 Will be input to the reset terminal of the F / F 28 and the base of the transistor 38 (see FIG. 3D). Therefore, the F / F28 is reliably reset with the logical value "H" on the reset terminal side and the logical value "L" on the set terminal side, and the Q output has the logical value "L".
Becomes Therefore, the transistors 58 and 22 are first turned "OFF" to stop the supply of the operating voltage _Vcc (see FIG. 7G), and then the transistor 18 is turned "OFF" to supply the driving power V _DB . Will be stopped (see (H) in the figure). By these operations, the entire control device is completely de-energized. As described above, this circuit example has the following advantages. . It operates with a small amount of power supplied from the power supply when the switch is operated, and the entire device is in the operating state. It is not necessary to keep the relay self-holding or constantly operating CMOS / IC, etc., so it is possible to save power very effectively. it can. . Since it is not a self-holding type that uses a relay, the number of contacts is minimized, which is advantageous in terms of cost. It is safe because the IC etc. are not always operating. . Since it is not a method of detecting the seated state of the operator by the sensor means, external parts such as a sensor are not required. . Since an equivalent filter is provided on the signal input side from the switch, it is effective as a countermeasure against noise from the battery side. . Since the drive power is supplied after power is supplied to the control circuit to stabilize the operation, malfunction can be properly prevented. It should be noted that the present invention is not limited to the above-described embodiments, and various design changes can be made within a range where the same operation is achieved. [Effects of the Invention] As described above, according to the present invention, it is possible to further reduce unnecessary power consumption and to be advantageous in terms of cost even though the configuration is simple. effective.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a basic configuration of the present invention, and FIG.
FIG. 3 is a circuit diagram showing the configuration of one embodiment, FIG. 3 is a time chart showing the operation of the embodiment, and FIG. 4 is a circuit diagram showing a conventional device. 100 ... Power source, 102 ... Switching device, 104 ... Power supply means, 106 ... Accelerator means, 108 ... Driving means, 110 ...
... Supply control means 112 ... Stop control means 114 ... Motor.

Claims (1)

(57) [Claims] In a power supply control device for an electric vehicle that controls the supply of electric power from a power source to a drive means that controls the supply of drive electric power to a motor based on the operation of an accelerator means, a connection and start for supplying electric power from the power source A switch device capable of instructing each, supply of operating power of a power source connected by the switch device to each means, and supply of drive power from the power source to the drive means based on a supply start instruction, and supply stop Power supply means for stopping based on an instruction; and, when a start instruction is given in the switch device, the power supply means gives a supply start instruction based on the electric power supplied from the power source through the switch device at the time of the instruction operation. And the supply control means for detecting the stop state of the accelerator means continued for a certain period of time. Stop control means for giving a stop instruction to the power supply means, wherein the power supply means supplies all of the operating power including the operating power and the driving power to the power supply means with the supply stop instruction. The power source control device for an electric vehicle according to claim 1, wherein the switch device is automatically stopped by the start instruction of the switch device.