VEHICLE DATA ABNORMALITY DETERMINATION DEVICE

• US 20130166989A1
• Filed: 07/08/2010
• Published: 06/27/2013
• Est. Priority Date: 07/08/2010
• Status: Active Grant

• Current Assignee: Mitsubishi Electric Corporation
• Original Assignee: Mitsubishi Electric Corporation
• Inventors: Miyazaki, Takehiro
• Granted Patent: US 9,172,398 B2
• Time in Patent Office: Days
• US Class Current: 714/758
• CPC Class Codes: F02D 2041/228 Warning displays
• CPC Class Codes: F02D 41/26 using computer, e.g. microprocessor
• CPC Class Codes: G06F 21/57 Certifying or maintaining trusted computer platforms, e.g. secure boots or power-downs, version controls, system software checks, secure updates or assessing vulnerabilities
• CPC Class Codes: G06F 21/64 Protecting data integrity, e.g. using checksums, certificates or signatures
• CPC Class Codes: H03M 13/05 using block codes, i.e. a predetermined number of check bits joined to a predetermined number of information bits H03M13/2906 takes precedence
• CPC Class Codes: H03M 13/09 Error detection only, e.g. using cyclic redundancy check [CRC] codes or single parity bit
• CPC Class Codes: H03M 13/11 using multiple parity bits
• CPC Class Codes: H04L 1/0057 Block codes H04L1/0061, H04L1/0064 take precedence
• CPC Class Codes: H04L 1/0061 Error detection codes

Abstract

Disclosed is a vehicle data abnormality determination device including a storage unit for pre-storing a 2-byte remainder term which is a result of a CRC arithmetic operation on a target area for arithmetic operations in a predetermined memory area, and an arithmetic operation unit for performing a CRC arithmetic operation while including the 2-byte remainder term in this CRC arithmetic operation. Because when performing the CRC arithmetic operation, the vehicle data abnormality determination device performs the CRC arithmetic operation while including the 2-byte remainder term in this CRC arithmetic operation after performing an arithmetic operation on the target area, the vehicle data abnormality determination device always makes the computed result be zero when the data has not been falsified, and can detect whether or not the data has been falsified easily and properly.

Claims

1. A vehicle data abnormality determination device which determines an abnormality of data used for controlling a vehicle, said vehicle data abnormality determination device comprising:

a storage unit for pre-storing a 2-byte remainder term which is a result of a CRC arithmetic operation on said data in a target area for arithmetic operations in a predetermined memory area; and

a CRC arithmetic operation unit for, when performing a CRC arithmetic operation, performing the CRC arithmetic operation while including said 2-byte remainder term in this CRC arithmetic operation after performing an arithmetic operation on the target area.

2. The vehicle data abnormality determination device according to claim 1, wherein the arithmetic operation unit changes an arithmetic operation order in such a way as to finally compute the 2-byte remainder term.

3. The vehicle data abnormality determination device according to claim 1, wherein when a flash ROM has a ROM capacity different from that of a mask ROM, a part of the flash ROM having a larger ROM capacity is excluded from a target for CRC arithmetic operations and the ROM capacity of said flash ROM is made to be equal to that of the mask ROM in such a way that a switch from the flash ROM to the mask ROM can be made.

4. The vehicle data abnormality determination device according to claim 1, wherein said CRC arithmetic operation unit carries out the CRC arithmetic operation on data stored in a ROM while carrying out normal control.

5. The vehicle data abnormality determination device according to claim 1, wherein said CRC arithmetic operation unit carries out the CRC arithmetic operation by using CR-16 or CRC-CCITT.

6. The vehicle data abnormality determination device according to claim 1, wherein said vehicle data abnormality determination device includes a CVN arithmetic operation unit for further carrying out a CRC arithmetic operation on a CRC arithmetic result for each of a plurality of storage areas to compute a CVN.

7. The vehicle data abnormality determination device according to claim 6, wherein said vehicle data abnormality determination device includes a communication control unit for transmitting the computed CVN, and transmits the CVN to an external tool via said communication control unit.