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Navigation device for vehicle

A technology for navigation devices and vehicles, applied in vehicle components, road network navigators, transportation and packaging, etc., to solve problems such as being too late to respond

Inactive Publication Date: 2011-11-23
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the first reading of the IPL read by the CPU from the flash memory is delayed, and as a result, the startup of software such as the OS is delayed, and the response to communications such as the on-board LAN may be delayed.

Method used

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  • Navigation device for vehicle
  • Navigation device for vehicle
  • Navigation device for vehicle

Examples

Experimental program
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Embodiment Construction

[0019] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0020] figure 1 It schematically shows the overall structure of the car navigation system. Vehicle navigation device (hereinafter referred to as "car navigator") 1 includes power switch 2, reset sequencer 3 (equivalent to power control unit), power supply 4, CPU 5 (equivalent to control unit), DRAM 6 (equivalent to backup storage unit) and SD card 7 (equivalent to a storage unit). The car navigation system 1 operates while being supplied with power from a backup power supply (hereinafter referred to as "BU power supply") 8 . The BU power supply 8 is a power supply that continues to supply power even when the vehicle's ignition switch is turned off and the main power supply is turned off, and is generated by stepping down a battery voltage (for example, 12V) to 3.3V. The BU power supply 8 is connected with the power switch 2 , the reset sequencer 3 and the power sup...

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PUM

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Abstract

A navigation device for a vehicle includes: a memory device (7) including a NAND type flash memory for storing a predetermined program and a boot program and a controller for searching a failure block in the flash memory and managing a corresponding relation between a logic block and a physical block with eliminating failure blocks; a back-up power source(8); a power source switch (2) for coupling the memory device with the back-up power source; a power source(4) for generating a predetermined voltage with using the back-up power source; a control device (5) energized from the power source with the predetermined voltage so as to be activated; and a power source control device (3). The control device determines whether activation is performed for the first time. The control device executes a stand-by process, and then, executes a boot process when the activation is performed for the first time. The control device executes the boot process without executing the stand-by process when the activation is after the first time. The power source control device controls the power source to function when the power source control device receives an activation signal from the power source switch. When the power source switch stops the activation signal, the power source control device stops the operation state of the power source.

Description

technical field [0001] The present invention relates to a vehicle navigation device using a flash memory as a boot device memory storing a boot program. Background technique [0002] In a vehicle navigation device, a flash memory is generally used as a memory (see Patent Document 1). Examples of such a flash memory include a flash memory for a boot device and a flash card for map media in which an IPL (Initial Program Loader), an OS (Operating System: Operating System), and an application program are stored. The boot device flash memory is a NOR type flash memory, so the size of the memory is large and the cost is high. On the other hand, the NAND-type flash memory used in the flash memory card for map media has a small memory size and can achieve a large capacity at low cost, so by using it as a boot device, cost reduction can be realized. [0003] Patent Document 1: Japanese Patent Application Laid-Open No. 09-182010 [0004] However, the NAND flash memory includes inhe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60R11/00G01C21/34
CPCG01C21/26G05F1/10G06F1/00G06F13/16
Inventor 金森贤树
Owner DENSO CORP