Control device for a vehicle electric system

• US 6,232,674 B1
• Filed: 04/28/1999
• Issued: 05/15/2001
• Est. Priority Date: 11/07/1996
• Status: Expired due to Term

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Geiger, Albert, Koelle, Gerhard, Frey, Wunibald
• Primary Examiner(s): PALADINI, ALBERT WILLIAM
• Application Number:
  US09/284,306
• Time in Patent Office: 748 Days
• Field of Search: 307/10.1, 307/64, 307/66, 700/79, 701/114, 320/187
• US Class Current: 307/10.1
• CPC Class Codes: B60R 16/03 for supply of electrical power to vehicle subsystems or for circuit arrangements for charging batteries H02J7/00
• CPC Class Codes: H02J 2310/46 for ICE-powered road vehicles
• CPC Class Codes: H02J 7/1423 with multiple batteries
• CPC Class Codes: H02J 7/143 with multiple generators
• CPC Class Codes: H02M 3/1582 Buck-boost converters H02M3/1584 takes precedence
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

A control device for an on-board electrical system with at least two batteries which can be charged by a generator and serve to supply various consumers is described. This control device is located between the two batteries and includes a supply network element, a bus-capable microcomputer, a direct voltage converter, and a short circuit proof end stage. The control device is supplied with information via various terminals, and via other terminals the control device can output control signals. As a function of predeterminable data, the on-board electrical system control device closes the connection between the two batteries and after being switched off enters a “sleep mode”.

Claims

1. A control device for a vehicle on-board electrical system having a power supply device including a generator (15) and at least two batteries (16, 18) chargeable by said generator and supplying power to at least a first consumer and a second consumer, the control device comprising a microcomputer (12), two end stages respectively including two field effect transistors (14a, 14b or 35, 37) which are connected to each other and each being connectable to a respective one of said two batteries, said two field effect transistors being switchable so as to establish connection between said batteries only under predetermined conditions;

at least one further field effect transistor (23) coupled to said microcomputer; and

two diodes (32, 33) each being coupled at one side thereof to a respective end stage and at another side thereof to said further field effect transistor, wherein said further field effect transistor switches the control device into operation by a control signal supplied thereto and a connection between said microcomputer and at least one of said batteries is established and wherein said control signal is dependent upon information obtained at a start of a vehicle.

2. The control device of claim 1, wherein said microcomputer is supplied with information via inputs, and as a function of said information said computer ascertains trigger signals, which are passed via connections to individual components of the control device and of the vehicle on-board electrical system.

3. The control device of claim 1, and further comprising a direct voltage converter (13) coupled to and being triggerable by said microcomputer and is connectable in series between said two batteries (16) and (18).

4. The control device of claim 1, and further comprising a power part with a converter which is in connection between said two batteries (16) and (18), and which outputs data to said microcomputer (12) and receives trigger signals from said microcomputer.

5. The control device of claim 4, wherein said power part with the converter includes a series circuit of said first field effect transistor (35), a choke (38), and said second field effect transistor (37), and a transistor (36) and a diode (39) of which at least one is located between a respective terminal of said choke (38) and ground.