RU2363980C2 - Interface unit - Google Patents

Abstract

FIELD: information technology.

SUBSTANCE: invention relates to computer engineering and is meant for use in vehicles. The technical outcome is achieved due to that, the interface unit comprises a real time clock, supply monitor, electrically independent reprogrammable read-only memory, buffer stages with inputs for connecting discrete sensors with power switching, buffer stages with inputs for connecting discrete sensors with mass switching, buffer stage with an input for connecting a frequency sensor, generator, computer unit, CAN interface transceivers, J 1708 interface transceiver, buffer stages with inputs for connecting analogue sensors, buffer stage with an input for connecting a resistive sensor, electronic intelligent switches with digital outputs with mass switching, an electronic intelligent switch with a digital output with supply switching, supply voltage conditioner with an error output, power output for analogue sensors and an on/off input, SPI interface, protection circuit, intermediate voltage converter, linear voltage stabiliser, power bus, I2C interface and a process channel.

EFFECT: design of an interface unit for use in a vehicle and meant for providing for interaction of electronic control units of Euro-4 level engines operating controls, sensors, display devices and other vehicle electronic systems.

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Description

The invention relates to the field of computer technology and is intended for use as part of motor vehicles (ATS) with electronic engine control systems (ECM) Euro-4 level, and can be installed in main road trains and buses manufactured by the Republican Unitary Enterprise (RUE) "MAZ", car factories in Russia and the Republic of Belarus.

Known programmable logic controller (see US Pat. RF No. 2101757, IPC 6 G06F 9/00, publ. 01/10/1998, according to the application No. 95120422/09 of 01/01/1995, patent holder of the Research Institute for System Research of the Russian Academy of Sciences) containing microprocessor, local bus, dual-port static RAM, VME bus interface, ISA bus interface, ROM, electrically programmable read-only memory EEPROM, real-time clock, keyboard controller, system controller, universal programmable watchdog timer, RS232 and RS485 serial communication interfaces, per serial bus, submodule bus interface, buffer amplifiers of address and receivers / transmitters of data of submodule bus, buffer amplifiers and receivers / transmitters of RAM data, receivers / transmitters of address and receivers / transmitters of data of the VME bus interface, buffer amplifiers of address and receivers / transmitters of data of the bus interface ISA, buffer address amplifiers and peripheral bus data receivers / transmitters.

Signs of an analogue that coincide with the features of the claimed invention are as follows: ROM, local bus, electrically programmable read-only memory EEPROM, real-time clock.

The reason that impedes the achievement of the claimed technical result is that this programmable logic controller is not designed to work as part of a telephone exchange, as it does not support the digital multiplex information channel (CMIK) CAN2.0, which does not allow for the interaction of the ECM with controls, sensors and car electronic systems.

Known programmable logic controller with a serial data interface in two standards (see RF application No. 2003115922/09 dated 05/27/2003, IPC 7 G06F 9/00, G06F 13/00, published on 11/27/2004, applicant Babanin VB), containing a set of buffer elements with a bipolar DC-DC converter, a microcontroller and a microcontroller pin switch with alternative in-circuit programming functions, a transmission protocol recognition circuit based on an integrator with two integration time constants, the input of which connected to the line of data received by the microcontroller, and the output is connected to the control input of the switch and the RESET input of the microcontroller, additionally contains a power supervisor, and in programming mode, the switch connects the outputs of the microcontroller to the signals of the serial data interface, and in the data exchange mode (stand-alone) to devices control and / or management.

The sign of the analogue, which coincides with the sign of the claimed invention, is as follows: nutrition supervisor.

The reason that impedes the achievement of the claimed technical result is that the programmable logic controller is not designed to work in automatic telephone exchanges, as it does not support the CMIC CAN2.0, which cannot ensure the interaction of the ESED with the controls, sensors and electronic systems of the car.

The closest analogue to the claimed invention is a control signal generation unit (BFUS) (see utility model patent No. 53030 of the Russian Federation, IPC G06F 9/00 (2006.01), published on April 27, 2006, according to application No. 2006102082/22, patent holder Research Institute of Multiprocessor Computing Systems, Taganrog State Radio Engineering University (SRI MVS TRTU (RU)), containing a microcontroller connected to a multiplexed address / data bus, with a random access memory (RAM) unit, network controllers, a block m of temporary storage of the address and data, which demultiplexes it and is connected to the RAM unit and network controller units by the address bus and along the control signal lines and address / data forms the I / O module connection interface, and the error analysis unit is connected to the microcontroller via the microcontroller diagnostic lines, as well as diagnostic lines for additional BFUSs connected through a block of galvanic isolation of BFUS signals, and an error signal line of I / O modules, in addition, the microcontroller is connected to the CAN interface No. 1 through the CAN No. 1 galvanic isolation unit and CAN No. 2 transceiver unit, to the SSI interface through the RS-485 No. 1 galvanic isolation unit, CLK RS-485 No. 1 receiver unit via CAN No. 1 data transmission / reception lines, CAN No. 2 and SSI, respectively, and the network controllers are connected via Ethernet No. 1 and Ethernet No. 2 galvanic isolation units via receive / transmit lines with the corresponding Ethernet interfaces, and the unit for temporary storage of the address and data on the address / data lines of the input / output modules, as well as on the lines control signals and along the diagnostic lines of the I / O modules the water forms an interface for connecting I / O modules.

Signs of an analogue that match those of the claimed invention are as follows: two transceivers of the CAN interface.

The reason that impedes the achievement of the claimed technical result is that the control signal generating unit is not designed to work as part of the automatic telephone exchange, as it does not have inputs for connecting discrete and analog sensors, outputs for controlling warning lamps and direction indicators of the automatic telephone exchange devices, which is not provides the interaction of the ECM with the controls, sensors and electronic systems of the car.

The problem to which the claimed technical solution is directed is to create an interface unit for use as part of a telephone exchange and designed to ensure the interaction of electronic control units for Euro-4 engines with controls, sensors, indicating devices and other electronic systems of the telephone exchange.

The technical result provided by the implementation of the proposed technical solution is as follows:

- monitoring the state of sensors and engine controls by means of buffer cascades of discrete inputs for connecting discrete sensors with mass switching, buffer cascades of discrete inputs for connecting discrete sensors with power switching, buffer cascades of inputs for connecting frequency sensors, buffer cascades of inputs for connecting analog sensors and buffer cascades of inputs for connecting resistive sensors;

- control of devices and control lamps displaying engine operation parameters in accordance with the information received from the engine control system is carried out through electronic smart keys of discrete outputs with switching to ground and switching to power, from electronic smart keys of discrete outputs from switching to ground and with switching Diagnostic information about the status of connected loads (open circuit, short circuit) is transmitted to the power in the computing unit;

- data exchange with electronic systems according to the CMIC CAN 2.0 (in accordance with the SAE protocol J 1939) and J 1708.

The specified technical result in the implementation of the invention is achieved by the fact that the real-time clock, a power supervisor, non-volatile reprogrammable read-only memory (EEPROM), p buffer stages with inputs for connecting discrete sensors with switching to power supply, q buffer cascades with inputs for connecting discrete sensors with mass switching, g buffer cascades with inputs for connecting frequency sensors, generator, k CAN interface transceivers, technological channel, n J1708 interface transceivers, w ISO 9141 diagnostic interface transceivers, t buffer stages with inputs for connecting analog sensors, s buffer stages with inputs for connecting resistive sensors, d electronic intelligent keys with discrete outputs with switching to ground, m electronic smart keys with discrete outputs with switching to power, voltage driver with error output, output for For power supply of analog sensors and a switching input, a protection circuit, an intermediate voltage converter, a linear voltage regulator, a computing unit containing an arithmetic logic unit (ALU) connected via a local bus, a read-only memory device (ROM), an input-output device, CAN controllers , UART 1, UART 0, UART 2, analog-to-digital converter (ADC) and random access memory (RAM), and the inputs of the input-output device of the computing unit are connected to the corresponding outputs q of the buffer cascade in with inputs for connecting discrete sensors with mass switching, r buffer cascades with inputs for connecting frequency sensors, p buffer cascades with inputs for connecting discrete sensors with switching power and with an error output from the driver of the supply voltage, outputs of the input-output device of the computing unit connected to the corresponding inputs of m electronic smart keys with discrete outputs, switched to power, the input of the supply voltage driver with the output for supplying analog d sensors and the input of the intermediate voltage converter, the inputs and outputs of the input / output device of the computing unit via the I2C serial interface are connected to the real-time clock, the power supervisor, the EEPROM and through the SPI serial interface with the corresponding inputs and outputs d of electronic smart keys with discrete outputs with switching to mass, the inputs of the ADC of the computing unit are connected to the corresponding outputs of t buffer cascades with inputs for connecting analog sensors, s of buffer cascades with inputs for connecting resistive sensors, I / O of the CAN, UART 0, UART controllers 2 computing units are connected to the corresponding inputs and outputs of k CAN transceivers, n transceivers of J 1708 interface and w transceivers of ISO 9001 diagnostic interface, UART 1 controller I / O the computing unit is connected to the technological channel, the inputs of the ALU of the computing unit are connected respectively to the output of the power supervisor and the output of the generator, the input of the intermediate voltage converter is connected to protection circuit, output - with a linear voltage stabilizer, one of the inputs for connecting discrete sensors with power switching is connected to an intermediate voltage converter, the protection circuit is connected to the power bus.

The limiting values of k, d, m, n, w, p, q, r, s, t are in the following range: k = (1, 2, ... 4), d = (1, 2 ... 12), m = ( 1, 2 ... 35), n = (0, 1), w = (0, 1), p = (1, 2 ... 40), q = (1, 2 ... 16), r = (1, 2 ... 4), s = (1, 2, 3), t = (1, 2, 3).

In the computational unit, the inputs of the ALU and the ADC inputs are respectively the inputs of the computational unit, the inputs of the input-output device and the outputs of the input-output device are respectively the inputs and outputs of the computing unit, the inputs and outputs of the input-output device and the inputs and outputs of the CAN, UART I, UART 0, UART 2 are respectively the inputs and outputs of the computing unit.

Since the interface unit is designed to operate as part of various types of automatic telephone exchanges, the number of some buffer cascades and electronic smart keys of the interface module depends on the number of sensors, warning lamps, and pointer devices installed on this type of automatic telephone exchange.

One embodiment of the block diagram of the interface unit for the Deutz engine management system is shown in FIG. 1 as an example, for the case when k = 2, t = 2, s = 1, r = 1, q = 15, p = 2, d = 10, m = 1, n = 1, w = 0. Figure 2 shows a block diagram of a computing unit. Figure 3 shows an exemplary connection diagram of the interface unit in the PBX.

The interface unit 1 (Fig. 1) includes a real-time clock 2, a power supervisor 3, an EEPROM 4, buffer stages 5 ₁ , 5 ₂ with inputs 6 ₁ , 6 ₂ for connecting discrete sensors with power switching, buffer stages 7 ₁ -7 ₁₅ with inputs 8 ₁ -8 ₁₅ for connecting discrete sensors with mass switching, buffer stage 9 with input 9 ₁ for connecting a frequency sensor, generator 10, computing unit 11, transceivers CAN interface 12 ₁ , 12 ₂ , transceiver interface J 1708 13, buffer stages ₁₄ January 14, ₂ input 15 _1, 15 ₂ for connecting analog Dutch Cove, buffer stage 16 to the input 16 ₁ for connecting a resistive sensor, intelligent electronic keys January ₁₇ -17 ₁₀ digital outputs January ₁₈ -18 ₁₀ switched to ground, the binary outputs ₁₈ September -18 ₁₀ switched to ground intended for connection arrow pointers, electronic smart key 19 with discrete output 19 ₁ with switching to power, driver of supply voltage 20 with error output 20 ₁ , output

20 ₂ for supplying analog sensors and an input 20 ₃ on, SPI 21, protection circuit 22, the output of which is connected to an intermediate voltage converter 23, the output of which is connected to a linear voltage regulator 24, a power bus 25 connected to the protection circuit 22, I2C interface 26, process channel 27, input 6 ₂ for connecting discrete sensors with power switching connected to an intermediate voltage converter 23, and the computing unit 11 (FIG. 2) contains: ALU 28, ROM 29, input-output device 30, controllers: CAN 31, UART 1 32, UART 0 33, ADC 34, RAM 35, which are connected through a local bus 36, and the inputs 28 ₁ , 28 _{2 of the} ALU 28 are the corresponding inputs of the computing unit 11 and are connected respectively to the output of the power supervisor 3 and the output of the generator 10, inputs 30 ₂ -30 _16, 30 _17, 30 _18, 30 _19, 30 _25, input-output devices 30 are respective inputs of the computing unit 11 and are connected respectively to the outputs of buffer stages ₁₅ -7 July _1, exit buffer stage 9, with the outputs of buffer stages 5 ₁ -5 ₂ and with the output of the supply voltage driver 20, outputs 30 ₂₁ , 30 ₂₂ , 30 ₂₃ , 30 ₂₄ , 30 ₂₆ input-output devices 30 are the corresponding outputs of the computing unit 11 and are connected respectively to the inputs of the electronic smart keys 17 ₉ , 17 ₁₀ , to the input of the electronic smart key 19, to the input of the supply voltage driver 20 and to the input of the intermediate voltage converter 23 , input-output January ₃₀ input-output device 30 is an appropriate input-output of the computing unit 11 and is connected through a serial I2C interface 26 ENPPZU 4, power supervisor 3, the real clock bp Meni 2, the input-output 30, _20, input-output device 30 is an appropriate input-output of the computing unit 11 and a SPI serial interface 21 which is used for communication with intelligent electronic switches ₁₀ -17 January _17, inputs and outputs ₃₁ January, 31 ₂ CAN controller unit 27 are respective inputs-outputs 11 and computing are respectively connected to the interface CAN transceivers January _12, February _12, an input-output controller 32 ₁ 1 UART 32 is accordingly input-output of the computing unit 11 connected to tehnologichesk m channel 27, the input-output 33 ₁ controller UART 0 33 is appropriately input-output unit computing 11 connected to the transceiver interface J 1708 13, inputs 34 _1, 34 _2, 34 _3, ADC 34 are appropriate computing 11 unit inputs connected to the corresponding outputs of the buffer cascades 14 ₁ , 14 ₂ and the output of the buffer cascade 16.

The supply voltage of the onboard network of the PBX (not shown) is supplied to the protection circuit 22, which is designed to protect against conducted interference of the onboard network of the PBX. From the output of the protection circuit 22, the supply voltage is supplied to the intermediate voltage converter 23, at the output of which a stabilized voltage of 7 V is generated. The intermediate voltage converter 23 is turned on by a signal from input 6 ₂ for connecting a discrete sensor with power switching (Fig. 1), and a signal from the computing unit 11.

Power digital and analog circuit block interface 1 is a voltage of 5 V, which is formed at the output of a linear voltage regulator 24.

The supply voltage of the analog sensors (5 ± 0.25) V (Fig. 3) is generated at the output 20 ₂ for supplying the analog sensors of the supply voltage driver 20. This supply voltage generator 20 has protection against short circuit of the output to ground and to the positive onboard power bus PBX network. The control of the inclusion of the shaper of the supply voltage 20 is carried out through the input 20 ₃ inclusion signal from the computing unit 11 through the output 30 ₂₄ . The output 20 ₁ errors of the driver of the supply voltage 20 is connected to the input 30 ₂₅ of the computing unit 11.

The power supervisor 3 generates a reset signal for the computing unit 11.

Generator 10 generates a clock frequency for computing unit 11. Buffer stages 7 ₁ -7 ₁₅ with inputs 8 ₁ -8 ₁₅ for connecting discrete sensors with mass switching and buffer stages 5 ₁ -5 ₂ with inputs 6 ₁ , 6 ₂ for connecting discrete sensors switched to power are designed to convert the logical levels of the input signals from the sensors installed on the PBX (figure 3), in the logic levels of the TTL for connecting to the computing unit 11. The speed signal, for example, from the tachograph of the PBX (figure 3) is fed to input 9 ₁ for connecting a frequency d tchika interface unit 1 for converting the logic levels velocity signal (0-8 V) at TTL levels and 9 via the buffer stage 30 to the input _17, the computing unit 11.

The signals of the analog sensors and the signal of the resistance sensor of the ATS (Fig. 3) are supplied to the inputs 34 ₁ , 34 ₂ , 34 _{3 of the} ADC 30 (Figs. 1, 2), which are the inputs of the computing unit 11 through the inputs 15 ₁ , 15 ₂ for connecting the analog sensors buffer cascades 14 ₁ , 14 ₂ and through the input 16 ₁ to connect the resistive sensor of the buffer cascade 16, respectively.

Electronic smart keys 17 ₁ -17 ₁₀ are based on TLE6232GP smart electronic key circuits. The control of discrete outputs 18 ₁ -18 ₁₀ with switching to ground is carried out by the computing unit 11 through electronic intelligent keys with switching to ground via the serial interface SPI 21 (figure 1). Discrete outputs 18 ₁ -18 ₈ with switching to ground are designed to connect control lamps (figure 3). The control of discrete outputs 18 ₉ -18 ₁₀ with ground switching for connecting direction indicators (Fig. 3) is carried out by computing unit 11 through electronic smart keys 17 ₉ -17 _{10 by} signals with pulse-width modulation via outputs 31 ₂₁ , 31 ₂₂ (Fig. one). The digital output 19 ₁ with switching to power is controlled by the computing unit 11 through the smart electronic key 19. From the electronic smart keys 17 ₁ -17 ₁₀ and the smart electronic key 19, the diagnostic information about the status of the connected loads (open circuit, short circuit) is transmitted to the computing unit 11 .

The configuration information and the history of events are saved in the EEPROM 4. The data exchange between the computing unit 11 and the EEPROM 4 is carried out via the I2C 26 serial interface.

The physical layers of digital serial interfaces (CMIC) CAN 1, CAN 2 are implemented on transceivers of the CAN 12 ₁ , 12 ₂ interface. The physical layer of the CMIC J 1708 is implemented on the transceiver interface J 1708 13.

Downloading software into the non-volatile memory of computing unit 11 is carried out through a serial technological channel 27 connected to the UART 1 32 controller.

Computing unit 11 can be made on the basis of the Fujitsu microcontroller MB90F543PF.

The operation of the interface unit as part of a telephone exchange with a Deutz engine of Euro-4 level showed the reliable operation of the interface unit in various operating modes: control of engine control devices, engine start (power supply to the electronic engine block, activation of the starter relay), engine operation under load (transmitting information to the engine on the position of the accelerator pedal), engine control in cruise control mode (transmission of torque correction commands to the electronic engine block), engine shutdown (transmission com ands to turn off the engine, turn off the power of the electronic engine block). At the same time, the interface unit is designed taking into account the requirements of GOST R 50905-96 “Motor vehicles. Electronic equipment. General technical requirements ”, GOST R 52230-2004“ Electrical equipment for tractors. General technical conditions ”and ensures reliable operation in the indicated modes under operating conditions that meet the requirements for automatic telephone exchanges.

Thus, it can be seen from the considered material that the claimed invention is new, industrially applicable and solves the technical problem with the claimed technical result.

Claims (3)

1. The interface unit, designed to ensure interaction between electronic systems of vehicles, containing two CAN interface transceivers, characterized in that it also includes a real-time clock, a power supervisor, an electrically independent reprogrammable read-only memory, p buffer stages with inputs for connecting discrete sensors with power switching, q buffer cascades with inputs for connecting discrete sensors with mass switching, r buffer cascades with inputs for connecting frequency sensors, a generator, k CAN transceivers, a technological channel through which the software of the computing unit is loaded, n transceivers of the J1708 interface, w transceivers of the diagnostic interface ISO 9141, t buffer cascades with inputs for connecting analog sensors, s buffer cascades with inputs for connecting resistive sensors, d electronic smart keys with discrete outputs with mass switching, m electronic smart x keys with discrete outputs with switching power supply, supply voltage driver with output for supplying analog sensors, error output and power-on input, protection circuit, intermediate voltage converter, linear voltage regulator, computing unit, containing an arithmetic-logic device connected via a local bus, read-only memory, input-output device, CAN, UART 1, UART 0, UART 2 controllers, analog-to-digital converter and random access memory, and the inputs are three input-output units of the computing unit are connected to the corresponding outputs q of buffer cascades with inputs for connecting discrete sensors with mass switching, r buffer cascades with inputs for connecting frequency sensors, p buffer cascades with inputs for connecting discrete sensors with power switching and output errors of the supply voltage driver, the outputs of the input-output device of the computing unit are connected to the corresponding inputs of m electronic smart keys with discrete outputs with by switching to the power supply, the input of the supply voltage driver and the input of the intermediate voltage converter, the inputs and outputs of the input / output device of the computing unit via the I2C serial interface are connected to an electrically independent reprogrammable read-only memory, real-time clock, power supervisor and through the SPI serial interface with the corresponding inputs and outputs d of electronic intelligent keys with discrete outputs with switching to ground, inputs analog go-to-digital converter of the computing unit are connected to the corresponding outputs of t buffer cascades with inputs for connecting analog sensors, s of buffer cascades with inputs for connecting resistive sensors, the inputs and outputs of the CAN, UART 0, UART controllers 2 computing units are connected to the corresponding inputs and outputs k transceivers CAN interface, n transceivers interface J1708 and w transceivers diagnostic interface ISO 9141, input-output controller UART 1 computing unit connected to the technological by voltage, the inputs of the arithmetic-logic device of the computing unit are connected respectively to the output of the power supervisor and the output of the generator, the input of the intermediate voltage converter is connected to the protection circuit, the output is to a linear voltage regulator, one of the inputs to connect discrete sensors with power switching is connected to the intermediate converter voltage, the protection circuit is connected to the power bus. 2. The interface unit according to claim 1, characterized in that the limiting values of k, d, m, n, w, p, q, r, s, t are in the following range: k = (1, 2, ... 4), d = (1, 2 ... 12), m = (1, 2 ... 35), n = (0, 1), w = (0, 1), p = (1, 2 ... 40), q = (1 , 2 ... 16), r = (1, 2 ... 4), s = (1, 2, 3), t = (1, 2, 3). 3. The interface unit according to claim 1, characterized in that in the computing unit the inputs of the arithmetic-logic device and the inputs of the analog-to-digital converter are respectively the inputs of the computing unit, the inputs of the input-output device and the outputs of the input-output device are respectively the inputs and outputs of the block computing, the inputs and outputs of the input-output device and the inputs and outputs of the CAN, UART 1, UART 0, UART 2 controllers are respectively the inputs and outputs of the computing unit.

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