JPS6010481B2 - Electric car brake device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a brake system for an electric vehicle, and particularly to a braking system for an electric vehicle that enables the electric vehicle to start without backing up when starting on a slope.

A conventional electric brake device of this type is shown in FIG.

Reference numeral 1 denotes a one-handle master controller (hereinafter referred to as a one-handle master controller), which is configured to give a power running command and a brake command to a power running circuit 2 and a brake brake counter 3, respectively, by operating one handle. .

In the configuration shown in Fig. 1, when the vehicle tries to power run after stopping on a slope with the electric brake applied, the 1-handle master controller 1 first turns off the brake command to the brake brake counter 3, and then the power running side A power running command is sent by switching the handle to /ch.

However, at this time, the power running circuit 2 is designed to switch the brake converter (switching between the brake circuit and the power running circuit) after the power running command is given, but it usually takes about It takes about 0.3 to 3 seconds. Therefore, until this conversion is completed, the braking force on the electric vehicle will be in groups. Therefore, the time it takes to complete the conversion in this way, and the time it takes for the power running circuit to generate enough starting torque for the electric car to overcome the gradient (if it is a resistance cam type, it will take several steps to advance). During this period (time required), there is a problem in that the electric car moves backwards due to the gravitational force of the slope.

In order to solve such problems, conventional measures have been taken as shown in FIG. That is, a self-resetting type manual brake switch 4 is provided, and when the handle of the brake lever 1 is operated to the power running notch, the switch 4 is also pressed at the same time, so that a brake command is continuously given to the brake device 3. When a starting torque large enough to overcome the slope is generated in the electric vehicle, switch 4 is turned on.
The brake is released by releasing the brake and allowing it to return to its original position. According to the conventional configuration shown in FIG.
The driver has to judge whether the operating time of the switch 4 is appropriate when starting the Sagi car, and the driver has to operate the switch 4 separately from the steering wheel operation of the master controller 1. There is a problem that it becomes complicated.

In order to solve this problem, a configuration as shown in FIG. 3 can be considered.

That is, a brake command time limit off device 6 is provided for the brake device 3, and the off-off device 6 is controlled by a speed detection device 8 that sends out a speed detection output based on the output of a speed generator 7. When the speed becomes zero or below a certain speed limit (for example, below 3'h), a command is given to the brake driver 3 to apply a braking force sufficient to prevent the vehicle from moving backward on the slope.In the configuration shown in FIG. At the time of starting the electric vehicle, a power running command is given from the master controller 1 to the power running circuit 2, and at the same time, this power running command triggers the brake command time off device 6. At this time, the brake command time off device 61 has a time limit (for example, about 3 seconds). The brake device 3 applies the brakes on the condition that the speed of the stringed engine car is below the speed limit (in this case, below 3 matsu'h) until the time period (set at the time set at 1) has elapsed.
However, normally, the starting torque is generated within about 3 seconds after the power running command is given, and therefore, after this time limit has elapsed, the brake command is issued from the brake command time limit 6 to the brake brake machine 3. As soon as this is eliminated, the electric car will be able to start with enough starting torque to overcome the slope.

As described above, according to the configuration shown in FIG. 3, when the electric vehicle is on a slope, it is possible to start the electric vehicle without backing up.
For example, when operating on a plane without a slope, the brake command time limit off device 6 operates in the same way when you want to operate at a speed lower than the set value of the speed detection device 8 with the L power running "1"/Tsutsu running 41" notch. However, there is an inconvenience in that the brakes are applied when the brake is applied, so it is still not sufficient.

The present invention has been made in consideration of the above points, and provides an electric vehicle brake system that prevents the brake from being applied when "TI" notch driving is desired, and that also ensures reliable anti-reverse operation when starting on a slope. This is what I am trying to propose.

Below, parts corresponding to those in Figure 3 are designated with the same reference numerals as in Figure 4.
Referring to the figure, an example of the present invention will be described in detail. In this case, a signal cut-off switch 11 is provided on the speed detection output line from the speed detection rhombus 8 to the brake command time limit OFF switch 6, and a brake command time limit switch 11 is provided. A signal cut-off switch 12 is provided on the brake command output line from the off-diameter 6 to the brake mount 3.
Here, when the switches 11 and 12 are turned off and opened, they remain off until they are turned on again. In the above configuration, when performing "1" notch operation by the master controller 1 as in the case of on-site operation, the switches 11 and/or 12 are turned off to turn them off.

However, when the switch 11 is turned off, the speed detection output of the speed detection device 8 becomes ) is not given to the brake command time limit off device 6, so this off device 6 does not send out a brake command to the brake equipment 3.

Therefore, the electric vehicle operates at a low speed "1" notch only by the powering command from the master controller 1 to the powering circuit 2.

Further, when the switch 12 is turned off, even if the brake command time-off device 6 sends out a brake command based on the detection output of the speed detection device 8, the switch 12 prevents the brake command from being applied to the brake device 3.

Therefore, in this case as well, the electric vehicle performs 11-notch operation at low speed only by the powering command from the master controller 1 to the powering circuit 2.

On the other hand, when starting the electric vehicle on a slope, the switches 11 and 12 are turned on.

Thus, in the same way as described above with reference to FIG. 3, the brake device 3 sends a brake command for a limited time by the brake command time limit off device 6, and after the time limit has elapsed, the brake command is released. The electric vehicle can be started without having to back up with the torque that overcomes the slope immediately. As described above, according to the present invention, when starting an electric car on a slope, it is possible to temporarily apply the brakes to prevent it from moving backward, but in this way, it is possible to perform low-speed operation by "1" notch like in yard operation. In this case, it is possible to avoid applying the brake by simply turning off the switch 11 or 12 in advance.

In addition, in FIG. 4, the signal cut-off switch 11 or 1
Either one of 2 may be omitted.

[Brief explanation of drawings]

1 to 3 are block diagrams showing an electric vehicle brake system to which the present invention can be applied, and FIG. 4 is a block diagram showing an example of the electric vehicle brake system of the present invention. 1...1 handle main controller, 2...power running circuit, 3...
... Brake device, 6... Brake command time limit off device, 8... Speed detection device, 11, 12...
...Signal disconnection switch. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1 A power running command is given to the power running circuit by switching the handle main controller to the power running notch, or a brake command is given to the brake device by switching the 1 handle main controller to the brake notch, and the brake is triggered by the power running command. The output of the command time limit off device is applied to the brake device on the condition that a speed detection output is given from a speed detection device that detects if the speed of the electric vehicle when the power running command is issued is below the speed limit. In the electric vehicle braking device, the brake device temporarily performs a braking operation based on the speed detection device, and the speed detection force line from the speed detection device to the brake command time limit off device, and from the brake command time limit off device to the brake device. 1. A brake system for an electric vehicle, characterized in that a signal cutoff switch is provided on at least one of the brake command output lines to the electric vehicle.