JPH0487501A - Brake controller for electric vehicle - Google Patents

Abstract

PURPOSE:To carry out appropriate brake force control conforming with every brake system and to realize flexible modification of characteristics with no ifluence on the other brake force pattern by operating electric and pneumatic brake force pattern independently. CONSTITUTION:Upon receiving a brake operation command from a normal brake command 1, a pneumatic brake force pattern operating circuit 3a and an electric brake force operating circuit 3b operate a pneumatic brake force pattern and an electric brake force pattern, respectively, according to the load. Consequently, an electric brake force generator 6 feeds an electric brake force coppresonding to the command back to a pneumatic-to-electric operation circuit 8. The circuit 8 subtracts an actual electric brake force feedback signal from a pneumatic brake force pattern signal 4, the difference is then amplified through an amplifying circuit 9 and fed to a pneumatic-to-electric conversion valve 11 which produces a pneumatic pressure. The pneumatic pressure is fed to a brake cylinder 12 which pushes a brake shoe 13 against the tread of wheel.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a brake control device mounted on an electrically propulsion vehicle on a railway or the like.

[Conventional technology]

BACKGROUND ART In general, electric railway vehicles use a combination of an electric brake, which is based on electrical braking of an electric motor used as a propulsion source, and an air brake, which uses a pneumatic cylinder.

FIG. 3 is a block diagram showing the configuration of a brake control device for an electric vehicle, which is described in, for example, Japanese Patent Publication No. 59-24604. In the figure, 1 is a service brake command given from the driver's cab, and this service brake command 1 is given to a brake cover turn generation circuit 3 together with a detection signal from a load detector 2 that detects the load of the vehicle. The brake cover turn generation circuit 3 calculates the necessary braking force based on the service brake command 1 and the load detection signal, and provides the obtained brake cover turn command 14 to the electric brake force generation device 6 and the electro-pneumatic calculation circuit 8. It will be done. The electric brake force generating device 6 performs electrical braking by reverse rotation, power generation, etc. on a vehicle propulsion electric motor (not shown) based on a given brake cover turn command 14. The electric brake force generator 4 supplies the actual electric brake force, that is, a feedback signal 7 of the actual electric brake force to the electro-pneumatic calculation circuit 8 . The electro-pneumatic calculation circuit 8 calculates the required pneumatic brake force from the difference between the required brake force based on the brake cover turn command 14 and the actual electric brake force feedback signal 7. This air brake force is generated by the air brake generator 10.
The electric signal is applied to an amplifier circuit 9 for driving the brake cylinder 12 of 1), amplified into a required electric signal, and applied to the electro-pneumatic conversion valve 1). The brake cylinder 12 has a brake shoe 13 attached to the piston rod, and the brake shoe 13 is pressed against the wheel tread by air pressure converted by an electro-pneumatic conversion valve 1) to generate brake torque.

Next, the operation of the brake control device configured as above will be explained. First, from the driver's cab, use the service brake command 1.
When this command and the load detection signal from the load detector 2 are given, the brake cover turn generation circuit 3 calculates the necessary braking force. Then, a brake cover turn command 14 corresponding to this braking force is given to the electric brake force generator 6, which generates an electric brake force corresponding to the command, and transmits the actual electric brake force to an electro-pneumatic calculation circuit. Give feedback to 8. Then, the electro-pneumatic calculation circuit 8 subtracts the actual electric brake force from the required brake force given from the brake cover turn generation circuit 3 to obtain the necessary pneumatic brake force. In other words, control is performed to compensate for the lack of electric brake force with air brake force.

This supplementary air braking force is amplified into a required electrical signal by the amplifier circuit 9, and is applied to the electro-pneumatic conversion valve 1) where it is converted into air pressure, thereby actuating the brake cylinder 12 and causing the brake shoe 13 to actuate. Brake torque is generated by

[Problem to be solved by the invention]

By the way, in the conventional brake control device configured as described above, when the characteristics are changed, for example by replacing the brake shoes 13, it is necessary to change the air brake cover turn accordingly. This is done by changing the characteristics of the brake cover turn generating circuit 3. However, in such a case, the characteristics of the electric brake cover turn, which do not need to be changed, are also changed, making it difficult to set both to an appropriate state.

The present invention has been made in view of such circumstances, and by independently calculating and controlling the electric brake cover turn and the air brake cover turn, it is possible to change the characteristics individually without affecting the other. The purpose is to provide a brake control device for electric vehicles that is possible.

[Means to solve the problem]

In the brake control device for an electric vehicle according to the present invention, the calculation unit that calculates the control pattern of the brake force is capable of calculating the control pattern of the electric brake force and the control pattern of the air brake force separately. .

[Effect]

The calculation unit independently calculates a control pattern for electric brake force and a control pattern for air brake force. Thereby, even if one control pattern is changed, the other control pattern remains unchanged and is not affected.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on drawings showing embodiments thereof. FIG. 1 is a block diagram showing the configuration of a brake control device for an electric vehicle according to the present invention. In the figure, reference numeral 1 indicates a service brake command given from the driver's cab, and this service brake command 1 is given to an air brake cover turn calculation circuit 3a and an electric brake cover turn calculation circuit 3b, respectively. The air brake cover turn calculation circuit 3a and the electric brake cover turn calculation circuit 3b each receive a detection signal from a load detector 2 that detects the load of the vehicle.

Each calculation circuit 3a, 3b calculates the necessary air brake cover turn and electric brake cover turn based on the service brake command 1 and the load detection signal, respectively, and calculates the air brake cover turn determined by the calculation circuit 3a. is sent to the electro-pneumatic calculation circuit 8 as the air brake cover turn signal 4, and the electric brake cover turn determined by the electric brake cover turn calculation circuit 3b is sent as the electric brake cover turn command 5.
They are respectively applied to the electric brake force generator 6 as a brake force. The electric brake force generator 6 performs electrical braking by reverse rotation, power generation, etc. on a vehicle propulsion electric motor (not shown) based on the given brake cover turn command 5.

The electric brake force generator 6 supplies a feedback signal 7 of the actual electric brake force to the electro-pneumatic calculation circuit 8 .

The electro-pneumatic calculation circuit 8 calculates the required air brake force from the difference between the air brake cover turn signal 4 and the actual electric brake feedback signal 6. This air brake force is applied to the brake cylinder 12 of the air brake generator 10.
The electric signal is applied to an amplifier circuit 9 for driving the electric signal, amplified into a required electric signal, and applied to the electro-pneumatic conversion valve 1).

The brake cylinder 12 has a brake shoe 13 attached to the piston rod, and the brake shoe 13 is pressed against the wheel tread by air pressure converted by an electro-pneumatic conversion valve 1) to generate brake torque.

Next, the operation of the apparatus of the present invention configured as described above will be explained. First, when a brake operation command is issued from the service brake command 1, the air brake cover turn calculation circuit 3a and the electric brake force calculation circuit 3b each calculate the required air brake cover according to the load detected by the load detector 2 at that time. A turn and an electric brake cover turn are calculated. Then, the electric brake force generator 6 receives the electric brake cover turn command 5 determined by the electric brake force calculation circuit 3b, generates an electric brake force corresponding to the command, and sends the actual electric brake force to the electro-pneumatic calculation circuit 8. give feedback. Then, the electro-pneumatic calculation circuit 8 subtracts the actual electric brake feedback signal 7 from the necessary air brake cover turn signal 4 given from the air brake cover turn calculation port a3a to obtain the supplementary air brake force.

This supplementary air braking force is amplified into a required electrical signal by the amplifier circuit 9, which drives the electro-pneumatic conversion valve 1) to generate air pressure. This air pressure is applied to the brake cylinder 12.
The brake shoes 13 are sent to the wheel treads to generate brake torque by pressing them against the wheel treads.

Figure 2 is a graph showing the characteristics of the braking force. Brake shoes generally have speed dependence.In order to keep the braking force constant in response to this, it is necessary to set the air brake cover turn as shown in Figure 2 (b). .

On the other hand, the electric brake cover pattern can be set in a flat pattern as shown in FIG. 2(C) regardless of the characteristics of the brake shoes. Such pattern settings can be made independently in the air brake cover turn calculation circuit 3a and the electric brake cover turn calculation circuit 3b, so even if the brake shoe characteristics or the electric brake force characteristics change, the other characteristics will not change. The air brake force and the electric brake force can each be set to appropriate characteristics without affecting the air brake force.

In this embodiment, the air and electric brake pattern calculation circuits 3a and 3b are configured to receive input separately and independently from the stage before each input of the service brake command 1 and the load detector 2. As shown in FIG. 3, a common input may be used up to the arithmetic circuit, and after the input, air and electric brake cover turn calculations may be performed separately and independently.

Further, in this embodiment, a configuration using an analog electronic circuit is shown, but it goes without saying that equivalent control may be realized by program processing using a device configuration using a storage means for calculating brake force.

〔Effect of the invention〕

As described above, in the brake control device for an electric vehicle according to the present invention, the brake cover patterns for electric and air are calculated independently, so that an appropriate brake can be selected according to the type of each -f rake. In addition to being able to control force,
The present invention has excellent effects, such as being able to flexibly respond to changes in characteristics without affecting the other brake cover turn.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a brake control device for an electric vehicle according to the present invention, FIG. 2 is a graph showing characteristics of braking force, and FIG. 3 is a block diagram showing the configuration of a conventional device. 3a...Air brake cover turn calculation circuit 3b...
・Electric brake cover turn calculation circuit 6...Electric brake force generator 10...Air brake force generator In the figures, the same reference numerals indicate the same or equivalent parts. Agent Daikimi Masuo Speed Chart Procedural Amendment (Voluntary) January 10, 1991 2 Name of invention Brake control device for electric vehicle 3 Relationship to the case of person making the amendment Address of patent applicant Chiyoda, Tokyo 2-2-3 Marunouchi, Ward Name (601) Mitsubishi Electric Corporation Representative Moriya Shiki 4, Agent address: Mitsubishi Electric Corporation, i2, 2-2-3 Marunouchi, Chiyoda-ku, Tokyo. (Contact information 03 (3213) 3421 Patent Department) Figure 5, “Detailed Description of the Invention” column 6 of the specification to be amended, contents of the amendment (1) “Reversed” on page 2, line 15 of the specification. " is corrected to "regeneration." (2) On page 6, line 20 of the specification, the word "reversal" should be changed to "
"Regeneration," he corrected.

Claims (1)

[Claims] (1) A brake control device for an electric vehicle that includes a calculation unit that calculates a control pattern for both braking forces in order to brake the vehicle by using both an electric brake using electric braking and an air brake using a pneumatic cylinder. A brake control device for an electric vehicle, wherein the calculation section is capable of calculating a control pattern for electric brake force and a control pattern for air brake force separately.