JPS592507A - Controller for electric motor vehicle - Google Patents

Abstract

PURPOSE:To always allow the brake force characteristic of a chopper vehicle to be coincident to that of a cam vehicle by providing a time limiter at the previous stage of a brake force step high priority circuit. CONSTITUTION:A brake force step high priority circuit 7 outputs a pattern command signal on the basis of the speed signal at that time when the brake force command decreases and the previous brake force command before it decreases. On the other hand, when the brake force command increases, the step high priority circuit 7 outputs sequential command signals coincident to the cam advancing time in a cam vehicle. A brake force step pattern generator 5 outputs a brake force pattern in response to a pattern command signal. A brake force high priority circuit 8 applies a signal of high level of the brake force pattern and the brake force command to a controller 6.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric vehicle control device for an electric vehicle such as an armature chopper vehicle or a field chopper vehicle (hereinafter referred to as a chopper vehicle) in which brake control of an electric motor can be performed continuously. An electric vehicle control device that enables good hybrid operation with a so-called resistance cam type control vehicle (hereinafter referred to as a cam vehicle) by changing the throttle control characteristics of the chopper vehicle. It is related to.

For chopper vehicles that can continuously control the electric motor's brakes, multiple predetermined patterns are set that represent the relationship between the speed of the electric vehicle and the braking force1.When the brake force command is lowered, one of these patterns is set. The goal is to slow down the electric vehicle along the lines. This enables mixed operation with a so-called resistance cam type control vehicle. However, under certain special operating conditions, problems may occur in brake control during hybrid operation of these two types.

Hereinafter, in order to explain the inconveniences in brake control during hybrid operation of resistance cam control vehicles (cam vehicles) and chopper vehicles, these types of electric vehicles will be individually explained based on the drawings.

First, FIG. 1 is for explaining the brake control operation of a camshaft resistance controlled vehicle, that is, a cam vehicle, and shows a brake notch curve of the cam vehicle. In the figure, the vertical axis shows the speed v, and the horizontal axis shows the braking force BE.
/8 to 7S is the brake step, and l is the speed control balance characteristic.

Now, a brake command is issued from the speed of vO, and the command value is at point A, and if this command value is held, the electric vehicle starts to decelerate while taking steps at the current limit point -. When the vehicle speed decreases and the brake force command value is lowered to 0 point at point B, which is smaller than the speed control balance characteristic, the current limiting point moves to 3, so the brake force begins to decrease toward point F, which is more consistent with the 6S step characteristic. is the intersection point E with the intermediate speed control parameter/parameter characteristic l.
The vehicle speed is balanced and the electric vehicle operates at a constant speed. In this way, the cam vehicle can perform holding speed operation at an unspecified arbitrary step, that is, at a speed, by changing the brake force command from a large command value to a brake force command smaller than the holding balance point.

Next, the restraint brake control of the chopper vehicle will be explained with reference to FIGS. 1 and 3. These chopper vehicles have continuously variable braking characteristics, and as they are, it is impossible to operate at a reduced speed as shown in the notch curve KG shown in FIG. Therefore, the number 5 is set so that a step pattern equivalent to the notch curve is stored.

FIG. 2 is a block diagram, and FIG. 3 is a speed braking force characteristic diagram. In FIG. 3, when a brake force command with a magnitude of A is issued from a speed V, the vehicle speed decreases in accordance with the brake force characteristic. When the vehicle speed decreases to point B, if the brake force command is lowered to a smaller 0 point than the braking force command, the brake step high-level memory circuit 7 shown in FIG. The high-level brake step 6S immediately before the point B where the braking force decreased is stored, and a command is sent to the brake step pattern generating circuit 3 shown in FIG. 2 that it is the 6S step. On the other hand, the brake step pattern generation circuit j receives the actually measured speed input from the speed detection circuit l and generates a brake force characteristic of 68 steps as shown in FIG.
This is given as a command to the next brake force high priority circuit t.

The brake force high priority circuit S determines which of this command and the brake force command is the brake command level, and gives the higher brake force command to the next controller 6. Controller 6
controls to generate this high level of braking force. That is, when the brake force command is lowered from point B to point 0 in FIG. Electric cars are controlled. Therefore, due to the characteristics of the brake step 6S, the speed of the electric vehicle attempts to decelerate toward F, but the speed is balanced at which intersection E due to the restraint balance characteristic l, and the electric vehicle is able to perform restraint operation at speed v7. can.

It can be understood that the brake control explained in FIGS. 2 and 3 is exactly the same as the restraint balance operation control explained in FIG. 1, and that restraint operation is possible even without a restraint notch command. . Further, if the number of brake steps 78 to 7S in FIG. 3 is set to be at least equal to or greater than the brake steps in FIG. 1, there will be no unbalance in the restraint load, and a restraint coupled operation with the cam wheel will be possible.

However, if the following operation is performed, a step imbalance with the cam vehicle will occur, and a problem will occur in which a load imbalance will occur between the cam vehicle and the chopper vehicle. That is, in FIGS. 1 and 3, the speed ■. When the brake force command was issued to 1 person and then immediately returned to the command value 3, the camshaft was about to advance from 78 to 58 in Figure 1, but when the brake force command was returned to 3. Therefore, the camshaft is operated at a slow speed of /8 steps and at a balance speed vJ. On the other hand, in the chopper car shown in Fig. 3, once the brake force at point A is output and then immediately returned to the brake force command 3, the chopper car will move to the SS step balance speed V The speed will be reduced to .

If electric vehicles with such characteristics are mixed, load imbalance will occur, which is a problem.

This invention has been made in view of the above points, and includes a time limit circuit provided in the front stage of the high-level storage circuit for the brake step in a chopper vehicle, and the brake step is sequentially stored in the high-level storage circuit at a time period equivalent to the camshaft advancement time. The present invention provides an electric vehicle control device that allows the braking force characteristics of a chopper vehicle to always match those of a cam vehicle by storing the brake force characteristics in a circuit.

An embodiment of the present invention will be described below with reference to FIG.

In FIG. 7, the brake step high-level memory circuit 7
is to input the brake force command through the time limit circuit.
However, since the other configurations are the same as those shown in FIG. 1, their explanation will be omitted.

In the above configuration, when the brake force command is issued up to point A in FIG.
does not immediately store step SS, but sequentially stores it from step /8 in accordance with the cam advance time in the cam vehicle. Gradually increase the force to the command value with a time limit.

As a result, the braking force characteristics of the cam car and chopper car are
Even in special handling situations where the brake force command changes instantaneously, they always match, enabling good hybrid coupled operation without load imbalance.

[Brief explanation of drawings]

Figure 1 is a characteristic diagram showing the brake notch curve of a cam vehicle.
FIG. 1 is a block diagram showing a conventional chopper vehicle control circuit, FIG. 3 is a diagram showing the speed-brake force characteristics in FIG. 2, and FIG. 7 is a block diagram of a chopper vehicle according to an embodiment of the present invention. FIG. 2 is a block diagram showing a reduced speed operation control circuit. In the figure, da is a speed detection circuit, S is a brake step pattern generation circuit (first circuit), 6 is a controller, ri is a brake step high level memory circuit (first circuit), and j is a brake force high priority priority The circuit (third circuit), D is a time-limiting circuit. In addition, the dust and = signs in the figure indicate the same or equivalent parts. Agent Shin Kuzuno -

Claims (1)

[Claims] A first circuit that stores a plurality of patterns representing the relationship between the speed and brake control of the electric vehicle and outputs one of the patterns in response to a pattern command signal, and a circuit that stores the actual speed at that time when the brake force command is lowered. a second circuit that outputs the pattern command signal to the first circuit based on the signal and the brake force command before being lowered; and a pattern output from the first circuit when the brake force command is lowered. The third motor vehicle is configured to decelerate the electric vehicle along the
In the electric vehicle control device, when the brake force command is increased, the pattern existing up to the point corresponding to the increased brake force command and the actual speed signal at that time is controlled by a predetermined circuit. An electric vehicle control device characterized in that a time limit circuit for sequentially storing data in the first circuit with a time limit is provided on the input side of the third circuit.