Error detection device for a multi-voltage vehicle power supply

• US 20030145256A1
• Filed: 11/08/2002
• Published: 07/31/2003
• Est. Priority Date: 12/08/2000
• Status: Abandoned Application

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Hadeler, Ralf, Jehlicka, Joerg
• Application Number:
  US10/203,442
• Publication Number:
  US 20030145256A1
• Time in Patent Office: Days
• US Class Current: 714/48
• CPC Class Codes: G01R 31/006 on road vehicles, e.g. automobiles or trucks testing of ignition installations peculiar to internal combustion engines F02P17/00
• CPC Class Codes: G01R 31/52 Testing for short-circuits, leakage current or ground faults
• CPC Class Codes: H02J 7/1423 with multiple batteries

Abstract

A device for error detection in a multi-voltage vehicle electrical system is proposed having a power distributor (40) that affects the supply of power to at least one electrical load (46) via at least one output (45), having detection means (41, 42, 44) that detect at least one electrical variable at the output (45), and having at least one signal processing unit (44) that compares the electrical variable (54, 56) to at least one limiting value, the detection of an error state being based on this comparison.

Claims

1. A device for error detection in a multi-voltage vehicle electrical system having a power distributor (40) that affects the supply of power to at least one electrical load (46) using at least one switching means (41, 42), having detection means (41, 42, 44) that detect at least one electrical variable (54, 56) that is applied to the electrical load (46), and having at least one signal processing unit (44) that compares the electrical variable (54, 56) to at least one limiting value, the detection of an error state (105, 111, 117) being a function of this comparison,

wherein the signal processing unit (44) detects an error by comparing at least one setpoint value (52) that is applied to the electrical load (46) or an expected value, to the electrical variable (54, 56) for the detection of the error state.

2. The device as recited in one of the preceding claims, wherein the signal processing unit (44) drives the switching means (41, 42).

3. The device as recited in one of the preceding claims, wherein the signal processing unit (44) drives the switching means (41, 42) in the open state and detects the voltage (56) present at the output (45) as the electrical variable.

4. The device as recited in one of the preceding claims, wherein the signal processing unit (44) drives the switching means (41, 42) to close them and detects the actual current value (54) as the electrical variable.

5. The device as recited in one of the preceding claims, wherein a setpoint current (52) of zero is applied to the electrical load (46) and the signal processing unit (44) compares the actual current value (54) to the setpoint current (52) for the error detection.

6. The device as recited in one of the preceding claims, wherein a setpoint current (52) other than zero is applied to the electrical load (46) and the signal processing unit (44) compares the actual current value (54) to the setpoint current (52) for the error detection.

7. The device as recited in one of the preceding claims, wherein the signal processing unit (44) produces the setpoint value for driving the electrical load (46).

8. The device as recited in one of the preceding claims, wherein the power distributor (44) is mounted in a motor vehicle.

9. The device as recited in one of the preceding claims, wherein the signal processing unit (44) is activated as a function of a switching signal of a switch (34, 36).

10. The device as recited in one of the preceding claims, wherein a door contact switch (36) or ignition starter switch (34) is used as the switch.