CN2254219Y

CN2254219Y - Automotive light monitor

Info

Publication number: CN2254219Y
Application number: CN 95206483
Authority: CN
Inventors: 黎燕明; 武金良; 贾群
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-03-28
Filing date: 1995-03-28
Publication date: 1997-05-14
Anticipated expiration: 2005-03-28

Abstract

The utility model relates to an automotive light monitor, which can monitor an automotive light system in the operator cabin. Once the light system is broken, the utility model immediately indicates the driver to repair the circuit and change the broken parts to exclude the trouble. The utility model is characterized in that the utility model is provided with a sampling head for replacing an original automotive safety box; a sampling and amplifying circuit is provided with a sampling resistor RC; the resistor RC is connected with an original automotive fuse in series; the sampling and amplifying circuit is connected with the sampling resistor RC in parallel. The current signal is collected from an original automotive light circuit and is sent to a display after the signal processing, the A/D conversion and a CPU. The utility model has the advantages of convenient installation and accurate monitoring; the utility model can keep the integrity of the original automobile.

Description

The car bulb monitor

The utility model relates to car bulb surveillance technology field.

At present, in automobile lighting system, remove room light light, all external lights all are " safety lights ", anterior light (the preceding side-marker lamp of automobile, far, dipped headlights etc.) driver can see or feel, steering indicating light and other alarm indicator can monitor on panel board, and the light of automobile rear (back side-marker lamp, Brake lamp, backup lamps etc.) driver can't see also to be difficult for feeling, this brings some problems with regard to the safety traffic of giving vehicle, for example in a single day Brake lamp breaks down, in the wagon flow of urban congestion, be easy to the traffic hazard that causes vehicle " to knock into the back ", for another example in the accident that highway takes place, have is that the light of vehicle breaks down and causes because of when the night running greatly.

In case the purpose of this utility model provides a kind of lighting system and breaks down, remind the driver to overhaul circuit immediately, change to damage parts, fix a breakdown, thereby avoid the car bulb monitor that breaks down and cause traffic hazard owing to the vehicle lighting system.

The utility model is achieved in that control circuit comprises sampling amplifying circuit, electronic switching circuit, A/D change-over circuit, central processor CPU, EPROM program chip, address latch, chip for driving, display and hummer.It is characterized in that, be provided with the sampling head of the former car safety box joint of a replacement, be provided with sampling resistor RC in the sampling amplifying circuit, this resistance R C connects with former car fuse, and the sampling amplifying circuit is in parallel with sampling resistor RC.

This monitor gathers out (sampling resistor is the RC in the circuit theory diagrams) to the current signal of each street lamp light by the sampling resistor RC that is connected in the former car insurance box, current signal is after the amplifying circuit processing and amplifying, become voltage signal, voltage signal is delivered to electronic switching circuit, electronic switch is controlled by CPU, the timesharing gating is sent to the A/D change-over circuit to each road signal, A/D conversion chip ADC0809 becomes digital signal to analog signal conversion, central processor CPU reads in data from A/D converter, then be solidificated in EPROM27C64 in program compare, through calculating the result is transported among the interface chip 82C55,82C55 is the luminescent device LED (light emitting diode) and the buzzer of its driving display of chip for driving, and address latch and EPROM CPU are connected into the single-chip microcomputer application circuit of standard.

This monitor is provided with a sampling head, and this sampling head replaces former car safety box joint, and the sampling amplifying circuit is arranged in the sampling head, other circuit component is installed on the interior mainboard of casing, be provided with display at the casing front end, it is a light emitting diode, and casing rear end is provided with buzzer.

Below in conjunction with accompanying drawing the utility model is done to describe:

Fig. 1 is the utility model principle of work block diagram

Fig. 2 is the utility model circuit theory diagrams

Fig. 3 looks synoptic diagram for the utility model casing master

Fig. 4 is Fig. 3 schematic top plan view

Fig. 5 looks synoptic diagram for Fig. 3 left side

Fig. 6 is the sampling head synoptic diagram

Referring to accompanying drawing, sample circuit is gathered out current signal in the load of former car light optical circuit, shows and the warning (see figure 1) on display after signal Processing, A/D conversion, CPU control; Control circuit comprises sampling amplifying circuit 1, electronic switching circuit 2, A/D change-over circuit 9, central processing unit (CPU) 3, EPROM program chip 5, address latch 4, chip for driving 8, display 6 and buzzer 7 (see figure 2)s; This instrument feature is the sampling head that is provided with the former car safety box joint of a replacement, is provided with sampling resistor RC in the sampling amplifying circuit, and this resistance R C connects with former car fuse, and the sampling amplifying circuit is in parallel with sampling resistor RC.The input end of the output termination electronic switching circuit 2 of amplifying circuit 1, the output terminal of electronic switching circuit connects with the conversion chip ADC0809 of A/D change-over circuit, and the control middle-end of electronic switching circuit connects with CPU, by CPU control electronic switching circuit.

At work, if a street lamp light break down (burning out if any a bulb) is arranged, current in loop will change, this variation is gathered out by sampling resistor RC, the output voltage of operational amplifier will change, variation has also just taken place in the analog signal voltage of delivering to A/D, variation has also just taken place in the digital signal of A/D converter input, for example 2V voltage A/D correspondence is output as sexadecimal number 32H, the output of 1V voltage A/D is 16H just so, the CPU data of reading in from A/D are with after the data being solidificated in EPROM are compared like this, will judge that this part lamp wiring has fault, CPU deliver to driving circuit 82C55 data this can change, 82055 LEDs that driven will change, simultaneously 82C55 drives buzzer 7 and reports to the police.

The driver shows that by the LED of display can understand the working condition of car external lights, if external lights breaks down, LFD can show immediately, and buzzer sends the sound simultaneously, reminds the driver to note, fixes a breakdown guarantee driving safety as early as possible.

Sampling head 14 of the present utility model replaces former car safety box joint, and be equipped with within it the sampling amplifying circuit 1, other circuit component is installed on the mainboard 12 in the casing 11, be provided with display 10 at the casing front end, it is a light emitting diode, and casing rear end is provided with buzzer 13, (seeing Fig. 3, Fig. 4, Fig. 5, Fig. 6), characteristics of this instrument are that sampling resistor RC is installed in the safety box of former car, do like this and can adopt the light current signal, do not change the structure of former car again.Another characteristics are that sampling section structurally adopts multiple sampling head structure, to adapt to the fuse box structure of multiple vehicle, so just can be equipped with corresponding sampling head, if this equipment circuit breaks down according to the different automobile types fuse box, former car fuse box joint can change the outfit, to guarantee the circuit operate as normal, therefore, sampling head and former car fuse box joint have good interchangeability, greatly facilitate installation, guaranteed the integrality of former car simultaneously.

The utlity model has following advantage:

1, utilize the safety box of former vehicle electrical cable bundles to be the Sampling Interface of this instrument. This Sample does not namely destroy primary car structure, and this instrument is installed on the vehicle easily and quickly, Even native system is just in case break down, the fast former car circuit of quick-recovery again.

2, adopt microcomputer control, but each street lamp light of precise monitoring, each independent load The working condition of (bulb).

3, this instrument adopts the Contemporary Industrial Design means on the external form structural design, makes Outward appearance is coordinated mutually with all kinds of vehicles, with the interface of vehicle on, adopt identical replacing structure, Make every effort to reach and to install with most of vehicle is convenient.

Claims

1, a kind of car bulb monitor, be used to monitor the working condition of the outer display lamp of car, control circuit comprises sampling amplifying circuit, electronic switching circuit, A/D change-over circuit, central processor CPU, EPROM program chip, address latch, chip for driving, display and hummer, it is characterized in that: the sampling head that is provided with the former car safety box joint of a replacement, in the sampling amplifying circuit, be provided with sampling resistor RC, this resistance R C connects with former car fuse, and the sampling amplifying circuit is in parallel with sampling resistor RC.

2, car bulb monitor as claimed in claim 1, it is characterized in that: the sampling amplifying circuit is arranged in the sampling head, and other circuit component is installed on the interior mainboard of casing, is provided with display at the casing front end, it is a light emitting diode, and casing rear end is provided with hummer.