2009年2月18日星期三
2009年2月11日星期三
Carputer
A Carputer, AutoPC or 'CarPC', is a general purpose computing platform installed in a vehicle.
Until 2006, no OEM or major aftermarket supplier offered or supported carputer-class installations, limiting the installed base to the hobbyist, enthusiast and entrepreneur communities. In use as early as 2000, the term generally refers to contemporaneous personal computers retrofitted in a production model car.
Home made Carputer systems are usually built from traditional desktop components, particularly the increasingly compact small form factor systems and ITX systems. The first commercially available aftermarket Carputer systems involved two main components: a monitor in the dashboard and a PC in the trunk. There are now all-in-one systems that can directly replace the factory radio in a car, without any separate components.
Laptops also serve a useful role as Carputer system components, but laptops are harder to integrate cleanly into the car. The major problem developers face is the software that is to be installed. For instance, as of 2007 GPS navigation is a common OEM equippable option and roughly equates to a laptop running GPS software[1].
Machine
The machine consists of the motherboard, processor, memory and data storage method. Data storage typically consists of a hard drive or solid state flash memory. If a hardrive is used, care must be taken to provide protection from bumps and vibration. For this reason notebook hardrives should be used. Small form factor and low power consumption typically require the use of a micro-atx, or mini-itx board.
Screen
Most carputers currently use TFT LCD screens as their displays. TFT displays have become cheaper in the recent years, which makes them a good choice for a carputer screen. Early TFT displays had low resolution, high cost and used composite video inputs. They also lacked the touchscreen feature. Before TFT screens became mainstream, LCD character displays and even small CRT TV screens were used. Most modern screens are equipped with touchscreen, providing an easy way of controlling the carputer. The most common modern-day screen used is the 7 inch VGA touch screen.[2].
Interface Hardware
In addition to the touchscreen display unit, many other options exist to interact with a Carputer in a manner that does not distract the driver from the most important task - keeping the car on the road. Alternatives for control devices involve the use of either IR or RF connected remote controls, or even keyboards and game controllers .
Interface Software
Interface software is what drives a Carputer system's hardware. The interface is very important because of the nature of the Carputer system. Typical use of a Carputer is while the vehicle is in motion. A well executed interface allows the user to concentrate on driving, rather than being distracted while looking at a screen in the vehicle's dash.
Available interface software (referred to as a "front end") varies depending on which operating system is utilized. Typically Windows operating systems have more options for interface software. However, there are interface software solutions available for Macintosh and Linux as well. There are many freeware solutions available as well as shareware software that can only be used on a pay-for basis. Nearly all interface solutions offer the flexibility of customization.
Software such as: Centrafuse, MediaCar, Media Engine, MediaPortal, Freeway, Road Runner, have been developed or can serve as a front end for a Carputer.
Other devices
Other devices that can be connected to a carputer include wireless network cards, GPS devices, Bluetooth, MP3 players, XM radio and Digital TV cards. In 2005, users were beginning to experiment with Heads Up Display options, although these are typically custom built rather than mass produced. Bluetooth devices can be used in the Carputer environment to wirelessly connect to GPS devices, mobile phones, or keyboards used to manage and maintain the system.
Power
Typical computer power supplies use AC (Alternating Current), which is the household standard. A car battery provides 12 V DC, which must be adapted to power the carputer by either using either an invertor or a DC-DC power supply. One exception is a laptop, which can sometimes be powered directly from the 12V supply, or using an adapter.
An inverter, provides standard household current so that normal power supplies can be used. The disadvantage of this is efficiency. An inverter consumes more power and exudes more waste heat than an equivalent DC-DC power supply. A DC-DC power supply replaces the original computer power supply and it is powered from the 12V car voltage.
A relay can be used in pair with the inverter, since most of the inverter in the market today does not have auto on or off functionality. Relay can be use to remote start the inverter, so that the inverter will not draw the battery.
A power source of cigarette lighter is one of the most convenient sources which you can use as a remote wire for relay, because it carries a constant 12V. It is also the most convenient way to retreat power for the applications such as in-dash monitor, external radio component, or laptop with the cigarette lighter adaptor.
Audio Equipment
Computers do not have an amplifier built in, therefore in a car setup one must be installed. Any standard car audio amplifier can be used. As such, other equipment can also be installed:
Subwoofers, crossovers, multiple speakers, and others. Signal processing and equalising can also be done by the carputer's software.
Basic features
Until 2006, no OEM or major aftermarket supplier offered or supported carputer-class installations, limiting the installed base to the hobbyist, enthusiast and entrepreneur communities. In use as early as 2000, the term generally refers to contemporaneous personal computers retrofitted in a production model car.
Home made Carputer systems are usually built from traditional desktop components, particularly the increasingly compact small form factor systems and ITX systems. The first commercially available aftermarket Carputer systems involved two main components: a monitor in the dashboard and a PC in the trunk. There are now all-in-one systems that can directly replace the factory radio in a car, without any separate components.
Laptops also serve a useful role as Carputer system components, but laptops are harder to integrate cleanly into the car. The major problem developers face is the software that is to be installed. For instance, as of 2007 GPS navigation is a common OEM equippable option and roughly equates to a laptop running GPS software[1].
Machine
The machine consists of the motherboard, processor, memory and data storage method. Data storage typically consists of a hard drive or solid state flash memory. If a hardrive is used, care must be taken to provide protection from bumps and vibration. For this reason notebook hardrives should be used. Small form factor and low power consumption typically require the use of a micro-atx, or mini-itx board.
Screen
Most carputers currently use TFT LCD screens as their displays. TFT displays have become cheaper in the recent years, which makes them a good choice for a carputer screen. Early TFT displays had low resolution, high cost and used composite video inputs. They also lacked the touchscreen feature. Before TFT screens became mainstream, LCD character displays and even small CRT TV screens were used. Most modern screens are equipped with touchscreen, providing an easy way of controlling the carputer. The most common modern-day screen used is the 7 inch VGA touch screen.[2].
Interface Hardware
In addition to the touchscreen display unit, many other options exist to interact with a Carputer in a manner that does not distract the driver from the most important task - keeping the car on the road. Alternatives for control devices involve the use of either IR or RF connected remote controls, or even keyboards and game controllers .
Interface Software
Interface software is what drives a Carputer system's hardware. The interface is very important because of the nature of the Carputer system. Typical use of a Carputer is while the vehicle is in motion. A well executed interface allows the user to concentrate on driving, rather than being distracted while looking at a screen in the vehicle's dash.
Available interface software (referred to as a "front end") varies depending on which operating system is utilized. Typically Windows operating systems have more options for interface software. However, there are interface software solutions available for Macintosh and Linux as well. There are many freeware solutions available as well as shareware software that can only be used on a pay-for basis. Nearly all interface solutions offer the flexibility of customization.
Software such as: Centrafuse, MediaCar, Media Engine, MediaPortal, Freeway, Road Runner, have been developed or can serve as a front end for a Carputer.
Other devices
Other devices that can be connected to a carputer include wireless network cards, GPS devices, Bluetooth, MP3 players, XM radio and Digital TV cards. In 2005, users were beginning to experiment with Heads Up Display options, although these are typically custom built rather than mass produced. Bluetooth devices can be used in the Carputer environment to wirelessly connect to GPS devices, mobile phones, or keyboards used to manage and maintain the system.
Power
Typical computer power supplies use AC (Alternating Current), which is the household standard. A car battery provides 12 V DC, which must be adapted to power the carputer by either using either an invertor or a DC-DC power supply. One exception is a laptop, which can sometimes be powered directly from the 12V supply, or using an adapter.
An inverter, provides standard household current so that normal power supplies can be used. The disadvantage of this is efficiency. An inverter consumes more power and exudes more waste heat than an equivalent DC-DC power supply. A DC-DC power supply replaces the original computer power supply and it is powered from the 12V car voltage.
A relay can be used in pair with the inverter, since most of the inverter in the market today does not have auto on or off functionality. Relay can be use to remote start the inverter, so that the inverter will not draw the battery.
A power source of cigarette lighter is one of the most convenient sources which you can use as a remote wire for relay, because it carries a constant 12V. It is also the most convenient way to retreat power for the applications such as in-dash monitor, external radio component, or laptop with the cigarette lighter adaptor.
Audio Equipment
Computers do not have an amplifier built in, therefore in a car setup one must be installed. Any standard car audio amplifier can be used. As such, other equipment can also be installed:
Subwoofers, crossovers, multiple speakers, and others. Signal processing and equalising can also be done by the carputer's software.
Basic features
- Play music from CDs, hard drive (MP3s, other compressed files) or external device (USB/PCI FM radio receiver, etc)
- Play video from DVDs, VCDs or from the hard drive (Note: Hard drives are sensitive to vibration, so driving with your Carputer turned on may shorten the life of the hard drive unless the hard drive is shock-proofed. Because laptop (2.5") hard drives are designed for such a portable device, they are generally more tolerant of shock and are an ideal choice over desktop (3.5") hard drives. Laptop hard drives are designed to endure the stress of moving and extreme conditions, unlike that of a desktop hard drive which is usually used as a stationary device, rarely if ever moved. Solid State Drive (SSD) can be used, as it has no moving parts (low energy consumption and heat production) and can withstand more vibration than Hard Disk Drives.
- GPS: Provide location tracking, route planning/navigation, etc.
- Satellite radio through external receivers. (Both Sirius and XM available)
- AM/FM Radio (There are radio tuners that can be integrated and controlled by software)
- Digital or Analog TV with the use of a hybrid receiver. Ease of operation through touchscreen display
- Internet browsing through an eligible cell phone or wireless 802.11 connections Hands free cell phone control via software with Bluetooth Mobile office
- Other external application support
Intermediate features
- Display video from car mounted camera for backing up. (infrared cameras are available for backing up at night)
- Record video from a webcam/mini-dv camera and store it to the carputer for later perusal. (good for recording close calls on the freeway - setup a rolling buffer which stores the last X minutes on button press)
- Connect with your cars OBD-II interface and display real-time data on all diagnostic information available. (RPM/Temps/Speedo/etc.) Pull error codes immediately. Never wonder what a check-engine light is for again.
- Wardriving: Using your 802.11b or g wireless connection and GPS, locate and log locations of wireless routers.
- Play video games. Alternately include an actual gaming system in the car.
- Download traffic/weather information from internet. (use home WIFI or connect through mobile phone)
- Connect to a mobile phone or other device using Bluetooth (useful for voice and data comms and synchronizing with PDAs, etc.)
- Interfacing with factory steering wheel buttons or equivalent. Provide night vision capability with infrared cameras.
- Wireless synchronization of files between desktop and carputer Use broadband internet phone options with cellular data card
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