JPH10122106A - On-vehicle electric power feed control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To use electrical devices requiring fixed processes and the like at power ON or OFF. SOLUTION: A relay switch R is made ON by means of an electric power feed control unit U by receiving signals from switches L, K, S for detecting release of door lock, and opening/closing or seating of a door. Before an ignition switch IG is made ON, electric power can be fed from a power source B to electrical devices C, N, M. When an engine is started by the ignition switch IG. These electrical devices C, N, M are in the condition capable of being used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for suitably controlling power supply to electric equipment such as a vehicle-mounted computer and a car navigation system.

[0002]

2. Description of the Related Art In recent years, vehicles have become increasingly electronic, and in addition to interior lights and car audio, which are conventionally called so-called accessories, a car navigation system or a personal computer that can be mounted on a vehicle may be mounted.

[0003] By the way, such a car navigation system and a vehicle-mounted computer start loading an initial program from the time when the power is turned on, so that it takes some time before the driver can actually use the program. In addition, when turning off the power, the in-vehicle computer and the sophisticated car navigation system need to perform a predetermined shutdown operation such as saving input data and destination data to a non-volatile memory. It is desirable to actually turn off the power.

However, conventionally, as shown in FIG. 2, an ignition switch I provided on a power line of a vehicle is provided.
When G is turned on, power is supplied from the power source B to the vehicle-mounted computer C, the navigation system N, and the liquid crystal monitor M that displays information on these C and N. Therefore, it takes time from when the driver gets on the vehicle to turn on the ignition switch IG with the key and before the operation of the in-vehicle computer C and the car navigation system N becomes possible. Also, when the backlight is a cathode discharge tube, it takes time for the liquid crystal monitor M to reach a predetermined luminance. Further, when the ignition switch IG is turned off, the supply of electric power is stopped immediately, so that the in-vehicle computer C and the car navigation system N may not be sufficiently shut down.

In order to solve the above-mentioned inconvenience, it is conceivable to always supply power to the on-board computer C and the car navigation system N.
Even if the resume function is used, a certain amount of power consumption is unavoidable, and there is also a problem that the battery runs out when the car is not used for a long time.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an electric power supply that can be used comfortably and safely when a vehicle is equipped with a computer or a navigation system.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, according to the present invention, before the ignition switch is turned on, the supply of electric power to predetermined electrical equipment is started. This power supply is started by detecting, for example, a door lock, opening / closing of a door, or sitting on a seat.

[0008] In this case, since the supply of power to a predetermined electrical device is started before the driver turns on the ignition switch, the predetermined process is performed when the electrical device starts up, such as a computer or a car navigation system. Even if it is necessary, it can be used when a predetermined process such as loading of an initial program is completed and the driver starts the engine with an ignition switch.

[0009] Further, when the ignition switch is turned off, it is notified to a predetermined electric device, and the supply of power is maintained for a predetermined time after the ignition switch is turned off. According to this configuration, when the electronic device requests to turn off the power after the predetermined process such as the shutdown, the predetermined process is started by the notification, and the predetermined time or Since the supply of power is maintained until a signal indicating the completion of the process from the electrical device is received, the electrical device is powered off after the completion of the predetermined process.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a vehicle-mounted power supply device according to the present invention will be described with reference to the accompanying drawings.

The power supply control device shown in FIG. 1 includes a relay switch R provided on a power supply line P, and a power supply control unit U for turning on or off the relay switch R.

The relay switch R is located on a power supply line P between the power supply B of the vehicle and the on-board computer C, the navigation system N, and the liquid crystal monitor M. When the relay switch R is turned on, these electrical devices C, N, M The power supply from the power supply B is started, and when the power is turned off, the power supply is stopped.

The power supply control unit U is an LSI including a predetermined logic circuit. The power supply control unit U receives signals from an ignition switch IG, a door courtesy switch K, a seat switch S, and a door lock switch L, and receives signals based on these signals. A signal is output to the drive transistor TR and the in-vehicle computer C.

The ignition switch IG has one end connected to the power supply B, the other end connected to the input terminal of the power supply control unit U, and pulled down via a resistor.
When turned on, HI is input to the power supply control unit U, and when turned off, LO is input to the power supply control unit U. The door courtesy switch K, the seat switch S and the door lock switch L have one end grounded and the other end connected to the power supply control unit U.
Connected to each of the input terminals and pulled up via a resistor, and inputs LO to the power supply control unit U when turned on, and inputs HI to the power supply control unit U when turned off.

When turned on, the ignition switch IG enables the supply of electric power from the power supply B to electric equipment such as a car stereo and an interior light, which does not require any processing at the time of startup, that is, conventional so-called accessories. .

The door courtesy switch K is provided between the vehicle body and the door and detects whether the door is open or closed. The door courtesy switch K is turned on when the door is opened.

The seating switch S is installed inside the seat, and is closed and turned on when pressed by the weight of the occupant.

The door lock switch L is provided in the door lock cylinder and detects whether the door is locked or locked or unlocked, and is turned on when the door is unlocked.

When any of the switches IG, K, S, and L is turned on and a signal corresponding to the switch is turned on, the power supply control unit U drives the drive transistor TR to turn on the solenoid of the relay switch R. The relay switch R is turned on by energizing. When the relay switch R is turned on, the in-vehicle computer C, the navigation system N, and the liquid crystal monitor M are supplied with power from the power supply B and start up.

As shown in FIG. 1, the in-vehicle computer C includes a CPU, a work memory, an initial circuit, and a hard disk (not shown). These are supplied with the voltage from the power supply B stabilized by the stabilized power supply.

The navigation system N is provided with a stabilized power supply, a CPU, a memory, and an initial circuit, similarly to the vehicle-mounted computer C. Then, the navigation system N and the on-vehicle computer C display the output information on the liquid crystal monitor M. In this embodiment, the navigation system N and the in-vehicle computer C
Although the liquid crystal monitors M are shared by the above, a liquid crystal monitor may be provided for each.

The liquid crystal monitor M is provided with an LCD system including a liquid crystal matrix and an LCD controller for driving the liquid crystal matrix, and a backlight for irradiating light from the back of the liquid crystal matrix. .

The operation of the power supply control device will be described below for the case of getting on the car and the case of getting off the car.

First, when riding in a car, the door lock switch L, the door courtesy switch K, or the seat switch S is turned on by releasing the door lock of the stopped car, opening the door, or sitting on the seat. Then, the power supply control unit U drives the drive transistor TR to turn on the relay switch R, and starts supplying power to the vehicle-mounted computer C, the car navigation system N, and the liquid crystal monitor M. Therefore, these electric devices L, N, and M are supplied with power and start up before the ignition switch IG is turned on. When the ignition switch IG is turned on, power is immediately supplied to a car stereo or the like.

The in-vehicle computer C activates the CPU in a predetermined sequence when the initial circuit is powered on, and loads the BIOS and OS from the ROM and the hard disk into the work memory to make it usable. When execution of a predetermined application program is designated at the time of activation, the application program is executed. Then, the passenger can use the in-vehicle computer C to perform data processing and computer communication via the in-vehicle telephone.

When the power is turned on, the navigation system N performs the same startup processing as the on-vehicle computer C, and checks the current position of the vehicle by comparing the map data from the compact disc with the positioning signal from the GPS antenna. Wait for input.

The liquid crystal monitor M gradually becomes brighter to a predetermined brightness from the time when the backlight constituted by the cold cathode discharge tubes is turned on, and is inputted from the vehicle-mounted computer C or the car navigation system N to the LCD controller of the LCD system and is supplied to the liquid crystal matrix. Will be displayed.

Therefore, this power supply control device can supply power to predetermined electrical equipment C, N, and M before turning on the ignition switch IG. Even the equipment is ready for use by the time the engine is started, making it comfortable for the driver.

Next, when getting off the automobile, the ignition switch IG is turned off to stop the engine. When the ignition switch IG is turned off, the power supply to the car stereo or the like is immediately stopped. The power supply of the car navigation system N and the liquid crystal monitor M is maintained within a predetermined time by the power supply control device in the following manner.

When the ignition switch IG is turned off, the power supply control device measures the time set by a built-in timer, and keeps the drive of the drive transistor TR until this time elapses to maintain the on-board computer C, Power is continuously supplied to the car navigation system N and the liquid crystal monitor M. Also, when the ignition switch IG is turned off, the power supply control device controls the on-board computer C.
And a signal is sent to the navigation system N to start the shutdown processing.

As described above, the power supply control device can save the input data and the data indicating the current state in the vehicle-mounted computer C and the navigation system N to the nonvolatile memory, so that the necessary data is erased. And the next time you get on the car, the on-board computer C and the car navigation system N are in the previous state, that is, in the state where the application program that was started and the current position and destination of the car are displayed. It will automatically start up, which is convenient for the driver.

In this embodiment, the timer in the power supply control unit U measures a certain period of time to secure the time for shutting down the electrical devices C and N. The power supply may be maintained until a signal indicating the shutdown completion is received.

[0033]

The vehicle power supply control device according to the present invention is configured as described above, so that it is possible to comfortably and safely use an electrical device that requires a predetermined process when the power is turned on or off. Therefore, it is very significant in equipping a vehicle with high-performance electrical equipment.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of a power supply control device according to the present invention;

FIG. 2 shows a conventional power supply system.

[Explanation of symbols]

 U power supply control unit B power supply R relay switch IG ignition switch K door courtesy switch L door lock switch S seat switch TR drive transistor

Claims (3)

[Claims] 1. An in-vehicle power supply control device, which is provided on a power supply line of a vehicle and controls power supply from a power supply to an electric device, before turning on an ignition switch.
An in-vehicle power supply control device, characterized in that supply of power to predetermined electrical equipment is started. 2. The in-vehicle power supply control device according to claim 1, wherein the power supply is started by detecting the release of the door lock, the opening and closing of the door, or the detection of seating on the seat. 3. An in-vehicle power supply control device, which is provided on a power supply line of a vehicle and controls power supply from a power supply to an electric device, detects that an ignition switch has been turned off, and notifies a predetermined fact to that effect. An in-vehicle power supply control device, which notifies an electric device and maintains power supply for a predetermined time after an ignition switch is turned off.