JPH07137557A - Braking energy regenerating device - Google Patents

Abstract

PURPOSE:To prevent the damage of a pump/motor when an electric circuit generates a trouble, and the like. CONSTITUTION:A piston 38 fixed to a fork shaft 33 is housed slidable to an air cylinder 34, and the piston 38 is driven by the compressed air led in from a port 40 at the connecting side, or a port 41 at the disconnecting side. To the port 40 and the port 41, a solenoid valve 44 at the connecting side, and a solenoid valve 45 at the disconnecting side, driven by an ECU, are connected respectively. On the other hand, a double check valve 51 is provided to the pipe line of an air piping 43, while a manual cutoff valve 53 is connected to a port 50 at one side input side. While the manual cutoff valve 53 is provided in the driver seat, an air piping 54 to feed a high pressure air from an air tank (not shown in the figure) is connected to the manual cutoff valve 53.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure-accumulation type braking energy regenerator used in an automobile or the like, and more particularly to drive control of a clutch connecting a power transmission system member and a hydraulic pump / motor.

[0002]

2. Description of the Related Art Conventionally, a braking energy regenerating device has been developed which is mounted on a vehicle such as a route bus and which collects kinetic energy during braking and uses it for starting and accelerating. The braking energy regeneration device includes a flywheel type and a power generation type, but Japanese Patent Publication No. 64-9000 and Japanese Patent Publication No. 5-1.
The pressure-accumulation type described in Japanese Patent No. 168 or the like is the mainstream in terms of performance and cost. In this braking energy regenerative device, a swash plate type hydraulic pump / motor (hereinafter simply referred to as pump / motor) connected to a power transmission system member via a dog clutch is provided between a hydraulic oil tank and an accumulator. When the vehicle is braked, the pump / motor is operated as a pump to pump the hydraulic oil in the hydraulic oil tank to the accumulator. Thereby, kinetic energy is converted into pressure energy and stored in the accumulator. Further, when the vehicle starts or accelerates, high pressure hydraulic oil is supplied from the accumulator to the pump / motor to operate the pump / motor as a motor. As a result, the pressure energy is reconverted into kinetic energy, and the drive wheels of the vehicle are driven via the power transmission system member.

Generally, in this type of braking energy regeneration device, the connection / disconnection of the dog clutch and the switching of the pump / motor are performed by air pressure or hydraulic pressure, and the air circuit or hydraulic circuit is controlled by an electromagnetic wave. A valve is provided.
The electronic control unit (ECU) controls the drive of each solenoid valve according to the driving situation, and when the driver depresses the brake pedal, the pump / motor is operated as a pump or when the accelerator pedal is depressed. Operate the pump / motor as a motor. Also, when you do not want to operate the system at high speed etc., disconnect the dog clutch and even if you depress the brake pedal,
Prevent pump / motor from spinning.

[0004]

The ECU of the above-mentioned braking energy regenerating device calculates various input information from a vehicle speed sensor, a pressure accumulation sensor, etc. in addition to a brake switch and an accelerator sensor, and outputs them to a dog clutch, a solenoid valve, etc. Output drive signal. However, if the electric wire that connects the ECU and the solenoid valve is broken, or if there is disconnection of the connector or contact failure of the connection terminal, the command from the ECU is not sent to the solenoid valve,
The dog clutch may not be disengaged even during high-speed traveling. In such a case, the power transmission system member may drive the pump / motor at a rotational speed exceeding the allowable limit, which may damage the drive mechanism in the pump / motor or cause the pump plunger to seize.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a braking energy regenerating device which prevents damage to a pump / motor when an electric circuit fails.

[0006]

In order to achieve this object, therefore, in the present invention, a hydraulic oil tank and an accumulator are connected via an oil passage, and a power transmission system member of a vehicle is connected via a clutch. And a hydraulic pump / motor connected in parallel, the hydraulic pump / motor is operated as a pump when the vehicle is braked, and the hydraulic oil in the hydraulic oil tank is pressurized and fed to the accumulator for storage. When the vehicle starts or accelerates, the hydraulic pump /
In a braking energy regeneration device that operates a motor as a motor and uses high-pressure hydraulic oil stored in the accumulator as start / acceleration energy, clutch drive control for driving and controlling the clutch to be in a disengaged or connected state. It is characterized by comprising an apparatus and a clutch manual operation means operable to put the clutch into a disengaged state, prior to the control by the clutch drive control apparatus.

[0007]

When the driver recognizes that the clutch is in the engaged state even during high-speed traveling by turning on the warning lamp or buzzing the buzzer, the driver operates the clutch by the clutch manual operation means to bring the clutch into the disengaged state. Then, the connection between the power transmission system member and the pump / motor is cut off, and the pump / motor does not rotate excessively.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a braking energy regenerating device according to the present invention, which is mounted on a large rear engine bus (hereinafter simply referred to as a bus), will be described below with reference to the drawings. As shown in FIG. 1, in the bus of this embodiment, a through shaft type differential unit 4 is connected to the front ends of an engine 1 and a transmission 2 which are vertically arranged, via a propeller shaft 3 to drive the bus. The driving force of the engine 1 is transmitted to the wheels 5.

A gear box 8 of a braking energy regeneration device 7 is connected to the front end of the differential unit 4 via a drive shaft 6. Then, when the differential carrier (that is, the drive wheels 5) not shown in the differential unit 4 rotates, the speed increasing gears 9 and 10 built in the gear box 8 also rotate.
A dog clutch 11 is built in the gear box 8, and the rotational force of the speed increasing gear 10 is transmitted to the swash plate type axial plunger type pump / motor 12 via the dog clutch 11.

The dog clutch 11 is driven and controlled by the ECU 13 to be in a connected or disconnected state. Further, the pump / motor 12 is also drive-controlled by the ECU 13 so that the tilt angle of the swash plate 14 incorporated therein is changed, and the function is switched between the pump and the motor and the discharge amount is changed. The ECU 13 includes an accelerator sensor 15 for detecting an accelerator opening, a brake pressure sensor 16 for detecting a brake pressure, a vehicle speed sensor 17 for detecting a vehicle speed, a pressure accumulation sensor 18 for detecting an accumulated pressure amount,
Governor control unit 1 for controlling engine 1
Various information is input from 9 and so on. The ECU 13 arithmetically processes these pieces of information to determine the operation mode of the braking energy regeneration device 7, and determines the dog clutch 11 and the pump / motor 12
Drive control.

On the other hand, the pump / motor 12 is connected to a hydraulic oil tank 22 for storing hydraulic oil and a nitrogen gas filled type accumulator 23 via a low pressure pipe 20 and a high pressure pipe 21, respectively. And the pump / motor 12
However, when braking, it operates as a pump, and the hydraulic oil tank 22
From the accumulator 23 by pumping hydraulic oil to the accumulator 23 and actuating as a motor when starting or accelerating.
Driven by high pressure hydraulic fluid from.

As shown in FIG. 2, the dog clutch 11
Is attached to the top of the gear box 8 and the gear 1
0 is connected to the clutch sleeve 30. The clutch main body 31 has an annular shape, the clutch fork 32 moves the clutch main body 31, and the air cylinder 34 drives the clutch fork 32 via the fork shaft 33. The clutch sleeve 30 is spline-fitted to the pump shaft 35 of the pump / motor 12,
It rotates integrally with the pump shaft 35. In FIG.
Reference numeral 36 is a connection detection switch, and the dog clutch 1
A signal is input to the ECU 13 when the 1 is connected. Further, reference numeral 37 is a pump rotation speed sensor, and the pump shaft 34
The rotation speed of is detected and a signal is input to the ECU 13.

A piston 38 fixed to the fork shaft 33 is slidably accommodated in the air cylinder 34, and the piston 38 is driven by compressed air introduced from a connection side port 40 or a disconnection side port 41. . Air piping 42,
The connection side solenoid valve 44 and the disconnection side solenoid valve 45 are connected via 43. Air pipes 46, 4 for supplying high-pressure air from an air tank (not shown) to both solenoid valves 44, 45.
7 is connected, and the drive electric circuit from the ECU 13 is also connected. Then, by supplying high-pressure air from the connection side solenoid valve 44 to the connection side port 40, the clutch main body 31 is driven to the left side in the drawing through the clutch fork 32, and the gear 10 and the clutch sleeve 30 are connected. It Further, by supplying the high pressure air from the disconnection side solenoid valve 45 to the disconnection side port 41, the clutch main body 31 is driven to the right side in the drawing via the clutch fork 32,
The gear 10 and the clutch sleeve 30 are disconnected.

On the other hand, a double check valve 51 having one outlet port 48 and two inlet ports 49, 50 is arranged in the pipeline of the air pipe 43. The double check valve 51 supplies compressed air having a higher air pressure in both the inlet ports 49 and 50 to the outlet port 48, and the outlet port 48 is connected to the disconnection port 41 of the air cylinder 33. The one inlet port 49 is connected to the disconnect solenoid valve 45. A manual disconnecting valve 53, which is a clutch manual operating means, is connected to the other inlet port 50 via an air pipe 52. The manual cutoff valve 53
An air pipe 54 for supplying high-pressure air from an air tank (not shown) is connected to the driver's seat (not shown) so that the driver can easily operate it.

The operation of this embodiment will be described below. In the present embodiment, during braking, when the pump / motor 12 operates as a pump in response to a command from the ECU 13, the hydraulic oil in the hydraulic oil tank 22 is sucked / pressurized by the pump / motor 12 via the low-pressure pipe 20 to generate a high pressure. It is pressure-fed to the accumulator 23 via the pipe 21. Further, at the time of starting / accelerating, when the pump / motor 12 operates as a motor in response to a command from the ECU 13, high-pressure hydraulic oil from the accumulator 23 is pressure-fed to the pump / motor 12 via the high-pressure pipe 21 to drive it. It flows back to the hydraulic oil tank 22 via the low-pressure pipe 20.

When operating the pump / motor 12, E
The CU 13 urges the connection-side solenoid valve 44 to supply high-pressure air to the connection-side port 40 of the air cylinder 34 to bring the dog clutch 11 into the connected state, while changing the tilt angle of the swash plate 14 to pump the pump. Switch the function between the motor and the motor and change the discharge rate. At this time, the ECU 13 causes the connection detection switch 3
When the connection state of the dog clutch 11 is confirmed by 6, the connection side solenoid valve 44 is deenergized.

As described above, the ECU 13 disengages the dog clutch 11 during high speed travel (65 km / h or more in this embodiment) to prevent damage to the pump / motor 12 due to excessive rotation. That is, the disconnection-side solenoid valve 4
5 is urged to supply high-pressure air to the disconnection side port 41 to disconnect the dog clutch 11. As a result, the piston 38 slides in the air cylinder 34 to the right in FIG. 2, and the clutch main body 31 also moves to the right via the fork shaft 33 and the clutch fork 32, so that the speed increasing gear 9 and the pump / pump The motor 12 is disconnected. Even in this case, the ECU
13 is the dog clutch 1 by the connection detection switch 36.
When the disconnection state of No. 1 is confirmed, the disconnection side solenoid valve 45 is deenergized.

However, the ECU 13 and the disconnection side solenoid valve 45
If the electric wire connecting the and is disconnected, the connector is detached, or the contact of the connection terminal is poor, the command from the ECU 13 is not sent to the disconnection side solenoid valve 45. Then,
As a matter of course, the disconnection-side solenoid valve 45 is not energized, and the dog clutch 11 remains in the connected state. ECU13
In such a case, by comparing the detection result of the vehicle speed sensor 17 with the detection results of the connection detection switch 36 and the pump rotation speed sensor 37, it is determined that the electric circuit is faulty and the warning lamp is turned on or the buzzer is turned on. Make a sound. When the driver senses these warnings, the driver operates the manual cutoff valve 53 to supply the high pressure air from the air tank to the air pipe 52. The high-pressure air supplied to the air pipe 52 is introduced into the disconnection-side port 41 of the air cylinder 34 via the double check valve 51 and slides the piston 38 to the right to increase the speed increasing gear 9 and the pump / motor. 12 is cut off.

Although the description of the specific embodiment has been completed, the embodiment of the present invention is not limited to this embodiment. For example, in the above embodiment, the present invention is applied to the one using the air cylinder for connecting / disconnecting the dog clutch, but it may be applied to the one using the hydraulic cylinder or the electromagnetic actuator.
Further, as the clutch manual operating means, a mechanical type such as a cable may be adopted.

[0020]

In the braking energy regenerating apparatus of the present invention, the power transmission system member and the pump / motor can be disconnected by the manual operation means in preference to the control by the clutch drive control apparatus. Even if there is a malfunction of the solenoid valve due to a failure, damage to the drive mechanism in the pump / motor and seizure of the pump plunger due to excessive rotation are prevented.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an overall structure of a braking energy regeneration device according to the present invention.

FIG. 2 is an enlarged view of a gear box.

[Explanation of symbols]

 8 gear box 9,10 speed-up gear 11 dog clutch 12 pump / motor 22 hydraulic oil tank 23 accumulator 30 clutch sleeve 31 clutch body 32 clutch fork 34 air cylinder 38 piston 40 connection side port 41 disconnection side port 44 connection side solenoid valve 45 Cutoff side solenoid valve 51 Double check valve 53 Manual switching valve

Claims (1)

[Claims] 1. A hydraulic pump / motor connected to a hydraulic oil tank and an accumulator via an oil passage and connected to a power transmission system member of a vehicle via a clutch,
When the vehicle is being braked, the hydraulic pump / motor is operated as a pump to pressurize the hydraulic oil in the hydraulic oil tank to supply the hydraulic oil to the accumulator for storage, while the vehicle is starting or accelerating the hydraulic pump / motor. In a braking energy regeneration device that operates a motor as a motor and uses high-pressure hydraulic oil stored in the accumulator as starting / accelerating energy, the clutch is in a disconnected or connected state,
A braking energy regeneration device comprising: a clutch drive control device for drive control; and clutch manual operation means operable to put the clutch into a disengaged state, prior to control by the clutch drive control device. .