JPS585363Y2 - electric car - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric vehicle that travels in one direction along a track, such as a mole rail type golf cart.

FIG. 1 is a perspective view showing an example of the electric vehicle of the present invention, and shows a mole rail type golf cart that runs in one direction on a mole rail constructed along a golf course.

In the figure, 1 is a mole rail provided along the course of a golf course, 2 is a golf cart that runs on this rail, and is configured to self-propel in one direction by a battery mounted on the cart 2. There it is.

3 is a bag holder installed at an angle on the front of the golf cart 2; 4 is a putter case attached to the bag holder 3; 5 is an umbrella also detachably attached to the bag holder 3; A stopper serving as a shock absorber protrudes from the front of the golf cart 2; 7 is an accessory case provided on the top surface of the golf cart 2; 8 is an operating lever installed approximately perpendicular to the golf cart 2; The golf cart 2 is started and stopped by the operation 8.

A drive circuit for such a golf cart 2 is shown in FIG.

In the figure, 10 is a control circuit associated with a start switch 11 and a stop switch 12 that are turned on in response to the operation of the operating lever 8, and a control signal from the circuit 10 is applied to a first transistor 13. has been done.

A main relay coil 14 is connected in series to the collector circuit of this transistor 13 and is also connected to a delay circuit 15 .

This delay circuit 15 consists of two resistors 16.1 connected in series.
7 and a capacitor 18, and a diode 19 is connected to short-circuit one of the resistors 17.

This delay circuit 15 is connected to the base of a second transistor 21 via an inverting circuit 20, and an auxiliary relay coil 22 is connected in series to the collector circuit of this second transistor 21.

23.23 is a pair of magnetic drive motors of the golf cart 2, which are set to be switched between series connection and parallel connection by the second relay contact 24.24,
Further, the main relay contact 25 switches between the battery power source 26 side and the braking resistor 27 side.

In addition, this battery power source is a motor 23゜23, a transistor 1
3,21. In addition, the control circuit 10 is commonly energized.

Therefore, when the cart 2 is in a stopped state, there is no signal from the control circuit 10 to the first transistor 13;
is in the cut-off state, and as a result, the second transistor 21 is also cut off, and the main and auxiliary relay coils 14.22 are not energized, and their contacts 25 are connected to the braking resistor 27 side, and the contacts 24.2
4 is in a state where motors 23 and 23 are connected in series.

Now operate the operating lever 8 and turn on the start switch 11.
When this happens, a control signal is issued from the control circuit 10 to
The transistor 13 is made conductive and the main relay 14 is energized.

As a result, the relay contact 25 switches to the power supply 26 side,
The cart 2 is started by energizing the motors 23 and 23 connected in series.

At this time, since the motors 23, 23 are connected in series to the power source 26, high torque is obtained although the speed is low, which is suitable for starting the cart 2.

On the other hand, when the first transistor 13 becomes conductive, the delay circuit 1
A signal is applied to 5.

At this time, when the resistance values of the resistors 16 and 17 are R1 and R2, and the capacitance of the capacitor 18 is C, the delay circuit 15 is connected to the inverting circuit 20 with a predetermined delay expressed by a time constant of (R1+R2)×C. A signal is transmitted to the second transistor 21 through the transistor 21, which makes the transistor 21 conductive and energizes the auxiliary relay coil 22.

As a result, the auxiliary relay contacts 24.2 are energized after a predetermined delay after the motors 23, 23 connected in series are energized.
4 is switched, the motors 23 and 23 are connected in parallel to the power source 26, and high-speed steady running is possible.

On the other hand, when the operating lever 8 of the running cart 2 is operated to turn on the stop switch 12, the signal from the control circuit 10 disappears and the first transistor 13 is cut off.

As a result, the main relay contact 25 is switched to the braking resistor 27 side, the motors 23 and 23 operate as a generator while being connected in parallel, and electric braking by the braking resistor 27 is applied to the cart 2.

At the same time, the state in which the transistor 13 is cut off is transmitted to the second transistor 21 via the delay circuit 15. At this time, the resistor 17 is connected in a short-circuit manner, and the time constant is determined by the action of the diode 19. The signal is transmitted to the transistor 21 after a certain delay time expressed by RIXC.

Therefore, after this certain period of time has elapsed, the second transistor 21 is cut off and the auxiliary relay contacts 24, 24 are switched to connect the motors 23, 23 in series.

Generally speaking, when braking is applied to this type of electric vehicle, the drive motor 23.23 is operated as a generator to apply the electric brake, but during steady running, the drive motor 23.23 is operated as a generator as described above. Since the motors 23, 23 are connected in parallel, the voltage generated by these motors 23, 23 is relatively low.

However, for example, the main relay contact 25 and the auxiliary relay contact 24.
If the circuit configuration is such that 24 and 24 are switched at the same time when the stop switch 12 is operated, the auxiliary relay contact 24.
4 switches even slightly quickly, the two motors 23, 2
3 are connected in series, and their motors 23,
23 is superimposed, resulting in a high voltage.

As a result, an abnormally high voltage is applied to the transistors 13, 21, the control circuit 10, etc., albeit momentarily, causing damage.

However, in the present invention, the motors 23 and 23 are connected in series with a certain delay after the main relay contact 25 is switched to the braking resistor 27 side due to the action of the delay circuit 15, so that the motors 23 and 23 are connected in series with each other with a certain delay. There is no damage to the control circuit 10, etc.

Also, when the stop switch 12 is operated, the time constant of the delay circuit 15 is R1×C, which is relatively short, so the motor 23 stops in a short time.
, 33 are connected in series, generating a high voltage and working together with the braking resistor 27 to generate a large braking force.At the same time, the charge in the capacitor 18 of the delay circuit 15 is also rapidly discharged, so that the stop switch 12 Start switch 11 immediately after operation
Even if the engine is operated, normal starting operation can be performed.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of the electric vehicle of the present invention, and FIG. 2 is an electric circuit diagram of its main parts, where 2 is a golf cart, 10
is a control circuit, 13.21 is a transistor, 14.25 is a main relay, 15 is a delay circuit, 22.24 is an auxiliary relay,
Reference numeral 23 indicates a drive motor.

Claims (1)

[Scope of utility model registration request] 1. In an electric vehicle driven by at least a pair of motors, a first transistor that operates exclusively based on a command from a control circuit, a main relay that operates depending on a current flowing through the transistor, and a main relay that operates based on a current flowing through the transistor; a delay circuit that delays and transmits an arbitrary state to a second transistor; an auxiliary relay that operates depending on the current flowing through the second transistor; at least a pair of electric vehicle drive motors; and the control circuit;
a transistor, and a common battery power source for the drive motor, and when the first transistor is made conductive in response to a command from a control circuit, the main relay is operated, and the pair of motors are connected in series by the auxiliary relay. At the same time, the conduction state of the first transistor is transmitted to the second transistor via the delay circuit, and after a predetermined time delay, the second transistor is also made conductive, and the auxiliary relay contacts are switched to operate the pair of motors. When the first transistor is cut off in response to a command from the control circuit, the main relay is operated to cut off the power to the motor, and at the same time, the cut-off state of this transistor is detected as described above via the delay circuit. the second with a delay of a certain time shorter than the predetermined time.
The electric vehicle is characterized in that the pair of motors are connected in parallel by transmitting the signal to the second transistor, cutting off the second transistor, and switching the contacts of the second relay. 2. When the power to the motor is cut off by the first relay, a braking resistor is connected to both ends of the motor, and the electric vehicle is electrically braked by the motor. An electric vehicle according to claim 1 of the utility model registration claim. 3. The delay circuit described above is constructed by an integrating circuit consisting of two resistors and a capacitor connected in series, and a diode is connected to short-circuit one of the resistors to determine the charging time of the capacitor and the capacitor. The electric vehicle according to claim 1 of the utility model registration claim, characterized in that the discharge time of the electric vehicle is set to be inconsistent with the discharge time of the electric vehicle.