Display unit BSK-10. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Display unit BSK-10. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Automobile. Electronic devices

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Modern cars are equipped with a large number of electronic devices: ignition system switches, engine control units, diagnostics, on-board computers, etc. e. We will introduce our readers to some of these devices installed on domestic VAZ and GAZ cars. This information can be useful to both specialists, tech and amateurs involved in the repair of such equipment. Today we will talk about the display unit of the onboard control system.

The on-board control system display unit (BI BSK-10, hereinafter referred to as the unit) is designed to display the state of vehicle components using ten light and one sound signaling devices. The list of controlled parameters and the colors of the corresponding light signals is given in the table.

Display unit BSK-10

This device with designations 12.3860 and 2110-3860010-04 is installed on all modifications of cars of the VAZ-2110 family [1]. The variant of the block described here was produced with minor changes from 1998 to 2002.

The operating unit can be in one of five modes:

1. "Off" - the key is not in the ignition.

2. "Waiting" - the key in the ignition in the "off" position. If the driver's door is open, the unit registers the "forgotten key in the ignition" event and beeps for 6 seconds.

3. "Pre-departure control of signaling devices" - when the key is turned to the "ignition" position. The duration of the mode is 4 s. One beep sounds and all lights come on for 4 seconds. The malfunctions "insufficient oil level", "insufficient coolant level", "insufficient washer fluid level" are monitored and their meaning is memorized, however, the light signals do not turn on until the end of the mode.

4. "Pre-departure control of parameters" - after the end of the "pre-departure control of signaling devices" mode and a pause of 1 s. Mode duration - 6 s. The triggered light indicators first flash for 6 s at a frequency of 1 Hz, then glow continuously until the malfunction is eliminated or the key is turned to the "off" position. The sound signaling device turns on simultaneously with the light signals for 3 s.

The registered malfunctions "insufficient oil level", "insufficient coolant level", "insufficient washer fluid level", "failure of stop lamps and parking lights" and "brake pad wear" are stored until the key is turned to the "off" position.

5. "Parameter control with the engine running" begins after the end of the "pre-departure parameter control" mode. The fault monitoring "insufficient oil level", "insufficient coolant level", "insufficient washer fluid level", fault monitoring "unclosed doors", "seat belts not fastened", "malfunction of stop lamps and side lights", "brake wear block" continues.

The device consists of two main parts (Fig. 1): a microprocessor and an indicator mounted on the control board A1 and on the indication board A2, respectively. Both boards are installed in a plastic case.

(click to enlarge)

The appearance of the block is shown in fig. 2. A 15-pin connector is used to connect power and sensors.

Display unit BSK-10

The output signals of the sensors come from the contacts of the XP1 connector to the inputs P0.0-P0.5, P2.0-P2.5 of the microcontroller DD3 through matching circuits A1B1-A1B12 and Schmitt triggers DD1, DD2 [2]. The outputs P1.0-P1.7, P3.1, P3.2 of the microcontroller are designed to control transistor switches A2B1-A2B10, which, in turn, switch the LEDs HL1-HL10. To form an audio signal that simulates the ringing of a bell, the dynamic head HA1 is used, which is connected through an isolation capacitor C9 to the output of an amplifier based on transistors VT7, VT8, controlled by the outputs P3.7.b, P3 of the microcontroller DDXNUMX.

When the key is inserted into the ignition lock of the car, the supply voltage is supplied from pin 11 of the XP1 connector through the VD9 diode, which protects the unit from polarity reversal, to a voltage regulator made on transistors VT1-VT6. The VD11R8R9VT6 circuit turns off the power supply of the unit if the voltage in the on-board network exceeds 24 V. The stabilizer provides a minimum voltage drop (no more than 0,6 V at full load) and allows the supply of a pulsed input voltage of up to 150 V.

The microcontroller DD3 [3] contains a built-in clock generator that works with an external ceramic resonator CSA-8.0MTZ from MSHATA at 8 MHz.

A fixed duration reset signal for the DD3 microcontroller, after the supply voltage is applied or if it drops below 4,2 V, generates a node ("supervisor") consisting of a threshold element on the VT10 transistor, a VD12 zener diode and a single vibrator on the elements DD4.3, DD4.4 . In standby mode (ignition off, front doors closed), the DD3 microcontroller is in a "sleep" state, while the current consumed by the unit does not exceed 7,5 mA. If the key in the lock is turned to the "ignition" position or any front door is opened, the node on the DD4.1 element and the VT9 transistor generates an interrupt (log. 0) at the output РЗ.З of the DD3 microcontroller, bringing it out of the "sleep" state.

The block indicates the open state of each car door. To save an individual signal from each door switch and turn on the interior lighting when any door is opened, VD5-VD8 diodes are used. Diodes VD1-VD4 prevent the power supply to the unit through the car's interior lamp.

The block mainly uses elements for surface mounting. Capacitor C9 - aluminum oxide SKR101M1EE11VM from JAMICON (replacement with a similar one is acceptable), capacitor C3 - tantalum size D for surface mounting, all other capacitors and resistors of sizes 0603, 0805 and 1206. Transistors MJE15031 and 2N5401 can be replaced with KT851A and KT6116A , and the transistors VS847 and VS857 - on KT3130A-9-KT3130Zh-9 and KT3129A-9-KT3129D-9, respectively.

Codes "firmware" microcontroller AT89C51-24QI (DD3)

Literature

Pyatkov K. B., Ignatov A. P., Kosarev S. N. et al. Cars VAZ-2110 and VAZ-21102: Maintenance and repair manual. - M.: Behind the wheel, 1996.
Stashin V. V., Urusov, A. V., Mologontseva O. F. Designing digital devices on single-chip microcontrollers. - M.: Energoatomizdat, 1990.
Atmel Corporation 8051 Flash Microcontroller Data Book. 1997.

Author: A. Yuferov, Cheboksary

See other articles Section Automobile. Electronic devices.

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