JPH0441682Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a braking control device for a walk-type resistance type electric vehicle.

[Conventional technology]

In walking-type resistance electric vehicles, the work vehicle operates while walking, so there is a risk that the work vehicle may become caught between the vehicle and an obstacle while working. To prevent this danger, an emergency switch is installed at the tip of the accelerator, and when the work vehicle is hit again, the switch is turned on and the vehicle reverses, requiring strong braking force. For this reason, the resistance value for 1st gear was made small and the delay time for turning on the reverse contactor was eliminated to ensure a quick reversal when the emergency switch was turned on.

[The problem that the idea attempts to solve]

However, the above-mentioned method works in the direction of deteriorating the normal running feeling, at the expense of the normal running feeling. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a brake control device that eliminates the above-mentioned problems with a simple circuit configuration, maintains an optimal feeling during normal running, and provides a good feeling when an emergency switch is activated.

[Means to solve the problem]

In order to achieve the above object, the present invention includes an emergency switch 5, an accelerator switch A,
This is a braking control device for a walk-type resistance electric vehicle having a running control circuit The travel control circuit X includes a travel command signal generation circuit Z, a delay circuit S, and a danger avoidance circuit Y. In normal times, the command signal from the accelerator switch A is inputted, and the command signal is inputted via the delay circuit S. The driving command generation circuit Z is driven to output a forward or reverse driving command signal for each speed, and in the event of danger, a command signal from the emergency switch 5 is input, and the danger avoidance circuit Y is used to control the delay. The present invention provides a braking control device for a walk-type resistance type electric vehicle which directly drives the traveling command generation circuit Z without going through the circuit S and outputs a traveling command signal for reversing at a predetermined speed.

[Effects of action and design]

According to the above configuration, when the emergency switch is turned on, the car reverses instantly and at a predetermined speed without going through a delay circuit, so strong braking force is generated and danger can be avoided. During normal driving, the vehicle is smoothly reversed via the delay circuit, which prevents cargo from collapsing and provides a good feeling both during normal driving and during emergencies.

〔Example〕

Fig. 1 is a simplified diagram of a walking type electric car (Fig. 2 is a conventional example of a resistance type control device for a walking type electric car), and Fig. 3 is a diagram of the present invention of a braking control device for a walking type electric car. An example is shown.

1 is a battery, 2 and 3 are fuses, 4 is a key switch, 5 is an emergency switch, and A is an accelerator switch. Accelerator switch A includes forward accelerator switch 6, reverse accelerator switch 7 and 2.
Consists of a speed accelerator switch 8 and a third speed accelerator switch 9, 6→8→9 (forward) or 7→
Each switch is configured to be turned on in the order of 8→9 (reverse).

X is a travel control circuit, which includes a travel command signal generation circuit Z, a delay circuit S, and a danger avoidance circuit Y.

The travel command signal generation circuit Z includes an excitation coil 10a of the forward contactor, an excitation coil 11a of the reverse contactor, and an excitation coil 12 of the second speed contactor.
a, an excitation coil 13a for the third speed contactor, a forward contactor, a reverse contactor driving transistor 14, a second speed contactor driving transistor 15, and a third speed contactor driving transistor 16.

Each excitation coil 1 of this travel command signal generation circuit Z
0a, 11a, 12a, and 13a, the contacts 10 of the forward contactor are connected and disconnected, respectively.
b, contact 11b of the reverse contactor, contact 12b of the second speed contactor, and contact 13b of the third speed contactor are opened and closed.

The delay circuit S is a known delay circuit 17 for 1st speed,
It consists of a known delay circuit 18 for 2nd speed and a known delay circuit 19 for 3rd speed.

The danger avoidance circuit Y includes diodes 20 and 21.
and resistors 24 to 27.

22 and 23 are diodes, 28 is a travel control resistor, 29a is a travel motor field, 2
9b is the armature of the travel motor.

As shown in Figure 1, walk-type electric vehicles require workers to operate the vehicle while walking, so there is a risk that the worker may become caught between the vehicle and an obstacle when moving forward. To prevent this danger, an emergency switch is installed so that when a worker is caught, the switch is turned on and the vehicle instantly turns around.

Incidentally, a conventional embodiment will be explained with reference to FIG. It should be noted that the same reference numerals are given to components having structures corresponding to those of the embodiment of the present invention.

According to this conventional example, when the accelerator is turned during normal driving and the accelerator switches 6 (or 7), 8, and 9 are turned on in sequence, the delay circuits 17, 18, and 19 are
The contactor drive transistors 14, 15, and 16 are turned ON in order after a certain period of time set in .
Therefore, the forward contactor excitation coil 10a (or the reverse contactor excitation coil 11a), the 2nd speed contactor excitation coil 12a, and the 3rd speed contactor excitation coil 13a are excited in order, and the forward contactor contact 10b (or Reverse contactor contact 11b), 2nd speed contactor contact 12
b. The contacts 13b of the third-speed contactor are closed in order, and the car moves forward (or backward).

Braking means include turning on the mechanical brake, turning off the accelerator, and turning the accelerator in the opposite direction (plugging braking).

When braking is performed by turning off the accelerator, the accelerator switches 6 (or 7), 8, and 9 are turned off, and the excitation coil 10a of the forward contactor (or the excitation coil 11a of the reverse contactor) and the excitation coil 12a of the 2nd speed contactor are turned off. , the excitation coil 13a of the third-speed contactor is de-energized (transistors 14, 15, 16 and delay circuits 17, 18, 19 are also
OFF), forward contactor contact 10b (or reverse contactor contact 11b), 2nd speed contactor contact 12b, 3rd speed contactor contact 13b
is opened, the car slows down and comes to a stop.

When performing plugging braking by turning the accelerator in the opposite direction, following the braking operation by turning the accelerator OFF (OFF the accelerator switch 6 (or 7), 8, 9), turn the accelerator switch 7 (or 6), 8,
9 is turned ON, the delay circuit 17 and the contactor drive transistor 14 are turned ON, and the excitation coil 11a of the reverse contactor (or the excitation coil 10a of the forward contactor) is excited, and the contact 11b of the reverse contactor (or the contact of the forward contactor) is excited. 10b) is closed and plugged. Then, after a certain period of time, delay circuits 18 and 19 are turned on in order, and transistors 15 and 16 are turned on in order,
The excitation coil 12a of the second speed contactor and the contact 13b of the third speed contactor are closed in order, and the vehicle starts in the opposite direction after plugging braking.

In an emergency, the emergency switch 5 is activated as mentioned above.
By turning ON, the excitation coil 10a of the forward contactor and the excitation coil 12 of the second speed contactor are turned on.
a, the excitation coil 13a of the 3rd speed contactor is de-energized (transistors 14, 15, 16 and delay circuits 17, 18, 19 are also OFF), the contact 10b of the forward contactor, the contact 12 of the 2nd speed contactor
b, contact 13b of the third speed contactor is opened,
The reverse contactor driving transistor 14 is turned on via the resistor 24, and the excitation coil 11a of the reverse contactor is closed via the diode 20, so that the vehicle runs in the first reverse speed after plugging braking to avoid danger.

As described above, in the conventional embodiment, first-speed plugging braking is performed for both emergency braking and normal braking, so the braking force for each is the same. In an emergency, a large amount of braking force is required, so
If the value of the travel control resistor 28 for 1st speed is set to that level, the normal plugging braking force will also become very large, resulting in a sudden shock, causing problems such as cargo shifting and falling cargo. Other problems included a worsening of the starting feeling, a decrease in the lifespan of the drive motor's brushes, and a decrease in the contact life of the forward/reverse contactor.

In contrast, one embodiment of the present invention shown in FIG. 3 operates as follows. Note that the operations during normal startup and normal braking are the same as those shown in FIG. 2, and will therefore be omitted.

In an emergency, when the emergency switch 5 is turned ON, the excitation coil 10a of the forward contactor, the excitation coil 12a of the 2nd speed contactor, and the excitation coil 13a of the 3rd speed contactor are released (transistors 14, 15, 16, delay circuit 17, 18, 19 too
OFF), the contact 10b of the forward contactor, the contact 12b of the 2nd speed contactor, and the contact 13b of the 3rd speed contactor are opened, and the contactor drive transistors 14 and 15 are turned on via the resistors 24 and 26, respectively, and the diode is turned on. 20 and 21, the excitation coil 12a of the reverse contactor is energized, and the contact 11b of the reverse contactor and the contact 12b of the 2nd speed contactor are closed, and the car performs 2nd speed plugging braking and instantly reverses, which is dangerous. Avoid.

As described above, since the emergency plugging braking can be set separately from the normal plugging braking, the emergency plugging braking force is higher than before, and the normal plugging braking force is smooth and shock-free for optimal electric vehicle control. equipment can be provided.

Other benefits include improved starting feeling, longer brush life for the travel motor, and longer contact life for the forward/reverse contactor.

In the above embodiment, the 2nd speed plugging braking is performed when the emergency switch is activated for the 3-speed resistance type electric vehicle control device, but the emergency switch is not applied for the n-speed resistance type electric vehicle control device (n≧2). During operation, at least two-speed plugging braking may be performed.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the running state of a walking type resistance electric car, FIG. 2 is a conventional circuit diagram, and FIG. 3 is a circuit diagram showing an embodiment of the device of the present invention. 5...Emergency switch, A...Accelerator switch, X...Travel control circuit, Y...Danger avoidance circuit, Z...Travel command signal generation circuit, S...Delay circuit, 10a...Forward contactor excitation coil,
10b...Contact point of forward contactor, 11a...
Excitation coil of reverse contactor, 11b...Contact of reverse contactor, 12a...Excitation coil of 2nd speed contactor, 12b...Contact of 2nd speed contactor, 13a...Excitation coil of 3rd speed contactor, 13b... ...3rd speed contactor contact, 28...
...Travel control resistor, 29a... Field of the travel motor, 29b... Armature of the travel motor.

Claims (1)

[Scope of claims for utility model registration] Emergency switch 5, accelerator switch A,
The emergency switch 5 is a braking control device for a walk-type resistance electric vehicle having a running control circuit Circuit X is a travel command signal generation circuit Z
, a delay circuit S, and a danger avoidance circuit Y,
In normal times, a command signal from the accelerator switch A is input, and the driving command generation circuit Z is driven via the delay circuit S to output a forward or reverse driving command signal for each speed.In times of danger, the emergency switch is activated. 5
A walk-type system that inputs a command signal by inputting a command signal, and directly drives the travel command generation circuit Z by the danger avoidance circuit Y without going through the delay circuit S, and outputs a travel command signal for reversing at a predetermined speed. Braking control device for resistance-type electric vehicles.