JP2936454B2 - Charge status alarm - Google Patents

Abstract

PURPOSE:To efficiently recover energy generated at the time of braking a vehicle to a secondary cell and to reduce fuel consumption by setting a predetermined target capacity smaller than a rated charge capacity in the charged state of the cell, and warning the effect of the state that the charge state exceeds the target state to a driver. CONSTITUTION:A predetermined target state (50-70% of a rated charge capacity) smaller than a rated charge capacity of a secondary cell of a DC power source E is set to the cell. The effect that the charge capacity exceeds the target capacity is warned to a driver to expedite the driver positively by the use of auxiliary drive force. Thus, energy generated at the time of braking a vehicle can be efficiently regenerated to the cell to so expedite the driving as to save the fuel consumption of an internal combustion engine EO, and hence fuel consumption can be reduced.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to an electric braking device for a motor vehicle. In particular, the present invention is used for an electric braking device having a structure in which electric energy generated from the electric braking device is regenerated to a secondary battery. 2. Description of the Related Art Techniques for regenerating electric energy generated by an electric braking device during braking to a secondary battery have been studied, but the techniques so far are not always satisfactory and are applied to commercial vehicles. Has not been reached. However, by using a cage type polyphase induction machine and controlling the rotation speed of a rotating magnetic field applied to a stator of the cage type polyphase induction machine, the cage type polyphase induction machine is operated as a generator. A technology has been developed which operates as a braking device and as an auxiliary driving device by operating as an electric motor. The inventors of the present application have conducted a test of this technology, and found that when this technology is used, a considerable percentage of electric energy generated by braking is regenerated to the secondary battery, and this can be effectively used as a power source for auxiliary power. Was. On the other hand, a secondary battery conventionally mounted on an automobile is always charged to almost 100% of its rated charging capacity.
It is designed and controlled to utilize the charged energy. That is, in the conventional control method, the secondary battery is charged by the generator connected to the internal combustion engine, and the charging is continued as long as the internal combustion engine is rotating. When the charging energy is used by the operation of the starting motor or the operation of the various outfitting devices, the charging circuit is controlled so as to reach the full charged state in the shortest possible time. [0005] However, as described above, the energy generated by braking is regenerated as electric energy to a vehicle-mounted secondary battery, and an automobile is powered by using the energy charged in the secondary battery. Under the technology used as driving assistance power, if the secondary battery is always charged to the rated charging capacity, the energy generated by braking cannot be efficiently regenerated and used. That is, it is not possible to increase the efficiency of the fuel used in an automobile using the above technology. According to the present invention, it is possible to efficiently regenerate and use electric energy to and from this secondary battery, and to determine whether the state of charge of the electric braking device for reducing fuel consumption exceeds a target value. It is an object of the present invention to provide a device for giving an alarm to that effect. According to the present invention, there is provided a battery having a predetermined target capacity smaller than a rated charge capacity in a state of charge of a secondary battery;
For example, 50-70% is set, and if the target capacity is exceeded, the driver is warned accordingly. The state of occurrence of the braking device cannot be predicted in advance according to the driving state of the vehicle, and always occurs under unexpected conditions. As described above, the charging capacity of the secondary battery is set to be small rather than the full charging capacity. Thus, when electric energy is generated by electric braking, the secondary battery has room for regenerative charging. By utilizing the regeneratively charged energy as an auxiliary driving force, the fuel consumption of the internal combustion engine can be reduced accordingly. The predetermined target capacity is a value to be selected and designed in accordance with the performance of the braking device, the operating condition of the vehicle, the absolute capacity of the secondary battery, the operating temperature, and other various conditions. If this target capacity is set to almost 100%, the energy generated by braking cannot be efficiently regenerated. Also, if the setting is too low, inconvenience occurs when starting is repeated many times depending on the operating conditions. Therefore, it is appropriate to set the target capacity to 50% or more and 70% or less. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of an apparatus according to an embodiment of the present invention. The rotating shaft of the cage type multi-phase induction machine I is directly connected to the internal combustion engine En of the automobile. The cage type polyphase induction machine I is provided with a rotation sensor SS. This vehicle is equipped with a DC power supply E including a secondary battery. Inverter means In is inserted between the DC terminal of the DC power supply E and the AC terminal of the cage type polyphase induction machine I. The inverter means In applies a rotating magnetic field to the stator of the cage-shaped polyphase induction machine I using a DC power supply, and converts AC generated by braking to the stator of the cage-shaped polyphase induction machine I into DC. Thus, the DC power supply E is configured to perform regenerative charging. Further, a discharge resistor R is connected to the DC power supply device E via a switch circuit SW. When the vehicle is suddenly braked and generates excessive electric energy that cannot be regenerated, the electric power is released. It is configured to be dissipated by the discharge resistor R. A control signal for applying a rotating magnetic field corresponding to the rotation of the rotor to the stator of the cage type polyphase induction machine I is supplied to the inverter means In by the control cage type polyphase induction machine CON.
It is supplied from T. The rotation information from the rotation sensor SS is input to the control circuit CONT, and the information of the DC power supply E regarding the state of charge of the secondary battery is input to the control circuit CONT. The control circuit CONT includes a microprocessor. Further, the control circuit CONT includes a unit that captures an operation control signal that changes depending on a driving condition by a driver's operation. As described above, the inverter device In can supply the energy of the DC terminal to the AC terminal and can supply the energy generated in the AC terminal to the DC terminal. Further, by controlling the control circuit CONT, the rotational speed of the rotating magnetic field is controlled so that the cage-shaped polyphase induction machine I becomes an electric motor, and a driving force is applied to the rotating shaft of the cage-shaped polyphase induction machine I to thereby provide the internal combustion engine En. Can be operated as an auxiliary driving device. At this time, the electric energy charged in the DC power supply device E is used. The inverter means In is specially designed for an automobile here, but its basic technology is known as technology for elevators and cranes. Here, in the apparatus of the present invention, the DC power supply E
Is characterized in that the state of charge of the secondary battery is controlled so as to have a predetermined target capacity smaller than its rated charge capacity in a steady state. The target capacity is 50-
70% is appropriate. In this way, when electric braking is performed during the operation of the automobile and electric energy is generated, the electric energy can be regenerated to the secondary battery of the DC power supply device E. As with the conventional method, the secondary battery
If it reaches 100%, it cannot be regenerated. When the regenerated and charged electric energy gradually increases and exceeds the predetermined target value, a warning is issued to the driver to urge the driver to actively use the auxiliary driving force. Thus, the charged electric energy is given to the cage type multi-phase induction machine I to generate power and to be effectively used. The controller CO monitors the state of charge of the secondary battery and
For the information to be transmitted to the NT, in the above embodiment, a method of observing and identifying the terminal voltage of the secondary battery was used. According to this method, the state of charge can be monitored although the accuracy is low. In order to further improve the accuracy, there are a method of monitoring the specific gravity of the electrolyte of the secondary battery, a method of measuring and integrating the charge and discharge of the secondary battery, and the like. When the charging capacity exceeds the predetermined target value, the driver is warned of this and uses the auxiliary driving force to reduce the fuel consumption of the internal combustion engine. The present invention is not limited to the electric braking device using the cage type polyphase induction machine shown in the above-described example, and the present invention can be similarly applied to a device that regenerates the electric energy generated by another type of electric braking device. As described above, the present invention has an advantage that the energy generated when the vehicle is braked can be efficiently regenerated to the secondary battery. In particular, a warning can be output to the driver, and the driver can use the auxiliary driving force of the vehicle to drive the vehicle to reduce the fuel consumption of the internal combustion engine. is there.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an electrical configuration of an embodiment of the present invention. [Description of Signs] En Internal combustion engine I Cage-type polyphase induction machine SS Rotation sensor In Inverter means CONT Control circuit E DC power supply including secondary battery SW Switch circuit R Discharge resistance

Continuation of front page    (72) Inventor Tetsuo Koike               3-1-1 Hinodai, Hino-shi, Tokyo 1 day               No Motor Co., Ltd. (72) Inventor Atsushi Obata               3-1-1 Hinodai, Hino-shi, Tokyo 1 day               No Motor Co., Ltd. (72) Inventor Koji Sasaki               Stock 1-1, 1-1-1, Shibaura, Minato-ku, Tokyo               Inside Toshiba head office (72) Inventor Hiroshi Uchino               1 Toshiba-cho, Fuchu-shi, Tokyo East Co., Ltd.               Shiba Fuchu Plant                (56) References JP-A-50-61620 (JP, A)                 JP-A-50-45239 (JP, A)                 48-34212 (JP, U)

Claims (1)

(57) [Claims] Automotive electric braking device and a secondary battery is mounted, at the time of braking by the regenerative electric energy generated from the electric braking apparatus is charged to the secondary battery, an acceleration electric motor driven by the electric energy of the secondary battery at the time of Is provided with means for providing an auxiliary driving force to the driving force of the internal combustion engine, and when charging the regenerative electric energy at the time of the braking, a predetermined target capacity smaller than its rated charging capacity is set as the charge state control target capacity value of the secondary battery. An alarm device for a charged state, comprising: an alarm output means for setting a state of charge and, when the state of charge exceeds the target capacity, giving an alarm to the driver to that effect. 2. The specified target capacity is 50% to 70% of the rated charging capacity
The alarm device for a charging state according to claim 1, wherein 3. 3. The alarm device according to claim 1, wherein the electric braking device includes a cage-type polyphase induction machine and means for controlling a rotation speed of a rotating magnetic field applied to the cage-type polyphase induction machine.