Electric quantity indicator for an electromotive vehicle

• US 7,576,544 B1
• Filed: 12/15/1999
• Issued: 08/18/2009
• Est. Priority Date: 12/16/1998
• Status: Expired due to Fees

• Current Assignee: Fairly Bike Manufacturing Co., Ltd., Index Electronics Company Limited
• Original Assignee: Index Electronics Company Limited
• Inventors: Hsu, Tsun-Tying
• Primary Examiner(s): Metjahic; Safet
• Assistant Examiner(s): Hamdan; Wasseem H.
• Application Number:
  US09/460,974
• Time in Patent Office: 3,534 Days
• Field of Search: 324/426, 324/427, 324/134, 324/132, 324/434, 320/132, 320/DIG.21, 320/DIG.24
• US Class Current: 324/426
• CPC Class Codes: B60L 58/10 for monitoring or controlling batteries
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

An electric quantity indicator for an electromotive vehicle comprises an electric measuring wire parallel connected to a battery; a feedback circuit connected between a motor of the power supply load and the electric measuring wire; and a meter responsed to the quantity of electricity of the electric measuring wire. The meter is an electronic display panel, and the feedback circuit and the electric measuring wire are installed with analog to digital (A/D) converter for address dividing the value in a memory, in which this value is displayed in the aforesaid meter. Thereby, as a load is actuated and power is consumed, the feedback circuit will detect, and the electric measuring wire will conduct, a real value about the power stored in the battery is displayed on the meter so as to be viewed by a user. Therefore, the condition that due to an error of electric quantity, the user can not know the real the electric quantity and thus the car is stopped owing to exhaustion of electric power is avoided.

Claims

1. An electric quantity indicator for a battery in an electromotive vehicle comprising:

a battery, an electric wire and a non-reset measuring meter connected to said battery by said wire;

a motor, a control switch and a feedback circuit connecting said meter and said motor in parallel through said switch and an amplifier having an output end disposed in said feedback circuit the output of the amplifier serving to actuate said control switch for controlling the conduction of the electric measuring wire through said meter to measure electric quantity and

wherein said feedback circuit is actuated by the power consumption of said motor to close said switch to connect said feedback circuit to said meter so that the real power storage is displayed on said meter; and

wherein the non-reset measuring meter is responsive only to a reduction in measured voltage and not to any increase in measured voltage.