JP2001315613A - Appropriate program preparing method, and electronic unit system using the method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for shortening the time of transmitting the data necessary for appropriately operating the other electronic unit from one electronic unit to the other electronic unit, and an apparatus using the method. SOLUTION: When the electronic units are electrically connected to each other, the data read-out symbol is transmitted from one electronic unit to the other electronic unit, and the other electronic unit receiving the data read-out symbol reads out the corresponding data from the memory storing the data corresponding to a plurality of kinds of data read-out symbols, and incorporates it into a program operated by the other electronic unit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a vehicle LA, for example.
N system, an airbag system, etc., a plurality of CPUs are provided in one system, and parameters and the like related to the operation of a program built in a ROM connected to one CPU are stored in a ROM connected to the other CPU. To have
When both CPUs are electrically connected, the parameters and the like are transmitted from one CPU to the other CPU, and the other CPU
And an electronic unit system using the same.

[0002]

2. Description of the Related Art A conventional electronic unit system of this type is disclosed in, for example, Japanese Patent Application Laid-Open No. H11-17716. First, the outline will be described below with reference to FIG. That is, this is a combination of the front occupant protection device 1, the front passenger occupant protection device 2 and the driver side occupant protection device 3 using multiplex communication. The configurations of the protection device 1 and the passenger side passenger protection device 2 (the driver side passenger protection device 3 is substantially the same as the passenger side passenger protection device 2) will be described.

Reference numeral 4 denotes a battery, reference numeral 5 denotes an ignition switch, and reference numeral 6 denotes a booster circuit. The booster circuit 6 boosts an output voltage from the battery 4 to generate a resistor 7. Backup capacitor 8 via
And supplies the first switch circuit 10 and the resistor 11 inserted in the power supply line 9 to the passenger-side side occupant protection device 2 via the resistor 11 in series, and the second switch circuit 10 inserted in the power supply line 12. The boosted voltage is supplied to the driver's side passenger protection device 3 via the switch circuit 13 and the resistor 14 in series. Reference numeral 15 denotes a longitudinal acceleration sensor for detecting acceleration generated in the longitudinal direction of the vehicle, and supplies an acceleration signal, which is a detection signal, to the microcomputer 16.

The microcomputer 16 has a collision judging function, and when executing the collision judging function, the first ROM
(Abbreviation of read-only memory) Tuning constant of the collision determination algorithm (program) stored in 17, for example, series data ABC for a certain X model
DEFGHIJ (individual A, B, C, D, E, F, G,
H, I, and J are one data), and executes an algorithm tuned based on the constants to determine collision. In other words, the front collision occupant protection device 1 includes all vehicle types (for example, vehicle types U, V, W,
X, Y, and Z) are shared in terms of hardware, but the difference is that the tuning constant related to the operation of the algorithm of the microcomputer 16 is the first R
Only the points stored in OM17. for that reason,
It is possible to correspond to the collision determination algorithm of each vehicle type only by writing in the first ROM 17 a tuning constant suitable for a plurality of predetermined vehicle types. The microcomputer 16 reads a tuning constant from the first ROM 17, for example, a series data A of a certain vehicle type X.
After reading BCDEFGHIJ and transmitting it from the microcomputer 16, the longitudinal acceleration sensor 15
The acceleration signal supplied from the backup capacitor 8 is calculated by a predetermined algorithm, and when it is determined that a serious collision has occurred, the third switch circuit 18 is turned on to discharge the electric charge charged in the backup capacitor 8 to the discharge diode 19 and the third switch circuit 18. , And an ignition current is applied to the primer 20 and the mechanical acceleration switch 21 in series.

[0005] The microcomputer 16 comprises:
A request signal is transmitted to the microcomputer 28 of the passenger side side occupant protection device 2 via the signal line S, the first communication circuit 22, the switching transistor 23, the resistor 24, and the power supply line 9, and The response signal from 28 is input via the second communication circuit 29, the switching transistor 30, the resistor 31, the power supply line 9, and the signal line V. The microcomputer 16 also sends a signal line S, a first communication circuit 22 and a switching transistor 2 to the microcomputer (not shown) of the driver's side side occupant protection device 3.
5, a request signal is transmitted through the resistor 26 and the power supply line 12, and a response signal from a microcomputer (not shown) is transmitted to the communication circuit, the switching transistor, the resistor, and the power supply in the same manner as the passenger-side passenger protection device 2. Input via line 12 and signal line Y.

When the request signal is supplied from the microcomputer 16 via the signal line S, the first communication circuit 22 selects one of the two switching transistors 23 and 25 based on the address data attached to the request signal. The passenger-side side occupant protection device 2 transmits the request signal via the power supply line 9 or 12.
Alternatively, it is transmitted to any of the driver's side side occupant protection devices 3.

[0007] Next, reference numeral 32 included in the passenger-side side occupant protection device 2 is the same acceleration sensor as the front-rear direction acceleration sensor 15, which has a different detection direction from the front-rear direction acceleration sensor 15. It is attached so as to detect acceleration, and supplies an acceleration signal as a detection output to the microcomputer 28. The microcomputer 28 has a collision determining function similarly to the microcomputer 16, and based on an acceleration signal supplied from the left-right acceleration sensor 32 and a switch signal supplied from an acceleration switch 33 described later, The magnitude of the collision from the side is determined, and when it is determined that the collision is serious, the switch circuit 34 is turned on to supply the ignition current to the primer 35.

Further, the second ROM 36 is provided with the first ROM
17 has the same functions as the first ROM (read only
Like the memory (abbreviation of memory 17), the microcomputer 28 stores tuning constants related to calculation of an algorithm (program) read and used when making a collision determination.

Next, when the microcomputer 16 of the occupant protection system 1 starts operating, the microcomputer 16 turns off the first and second switch circuits 10 and 13 via the signal lines U and X. At the same time, the microcomputer 16 of the front occupant protection device 1 and the front passenger occupant protection device 2 are switched over only for a predetermined time after the fourth switch circuit 27 is turned on via the signal line T.
Microcomputer 28 and the microcomputer of the driver's seat occupant protection device 3 simultaneously and independently start an initial operation.

That is, the microcomputers 16 and 28 including the microcomputer of the driver's seat occupant protection device 3 read the tuning constants from the first, second and third ROMs 17, 36 and 41 respectively connected thereto, and When an algorithm for determining a collision is set and the microcomputer 16 of the occupant protection device 1 determines that a serious collision has occurred based on the acceleration signal from the longitudinal acceleration sensor 15, the switch circuit 18
Is turned on, the electric charge charged in the backup capacitor 8 is supplied to the primer 20 through the discharging diode 19 to deploy the airbag and the like, thereby protecting the occupant from a forward collision.

Further, when the vehicle is collided with the passenger seat,
The microcomputer 2 of the side passenger protection device 2 for the passenger seat
When it is determined that the collision is a serious collision based on the switch signal from the acceleration switch 33 and the acceleration signal from the lateral acceleration sensor 32, the switch circuit 34 is turned on to transfer the electric charge charged in the backup capacitor 8 to the power supply line 9. To protect the occupant from side collision by deploying the airbag to the primer 35 through the airbag. The same operation is also performed for the driver's side side occupant protection device 3. That is, the microcomputer 16 of the front collision occupant protection device 1 stores the above-mentioned tuning constant of the algorithm of the collision determination process performed by the microcomputer 28 of the side collision occupant protection devices 2 and 3 in the first ROM 17 in advance. When the side collision occupant protection devices 2 and 3 are electrically connected to the front collision occupant protection device 1, the microcomputer 16
Is read from the first ROM 17 and supplied to the microcomputers of the side occupant protection devices 2 and 3 so as to make the program operable properly.

[0012]

However, in the case of the above-described method or configuration, FIG.
As shown, for example, ten tuning constants A,
B, C, D, E, F, G, H, I, and J are converted into series data, and the microcomputer 16 as one electronic unit is replaced with the microcomputer 28 as another electronic unit (or a driver side collision). Even if the bits are garbled, the data is repeatedly transmitted three times to the microcomputer of the occupant protection device 3 using the principle of majority decision so that the correct data can be determined. There is a problem that as the (digit number) becomes larger, more time is required for the transmission time T1.

Therefore, the present invention has been made in view of the above-mentioned problem, and has a time required for transmitting data necessary for properly operating the other electronic unit from one electronic unit to the other electronic unit. It is an object of the present invention to provide a method for performing the method in a short time and an apparatus using the method.

[0014]

According to a first aspect of the present invention, there is provided a proper program creating method for reading data indicating an object to which the electronic unit is attached from one of the electronic units when the electronic units are electrically connected to each other. The other electronic unit, which transmits the symbol to the other electronic unit and receives the transmitted data readout symbol, uses the data readout symbol as a key to indicate data of all objects to which the electronic unit is attached. Data is read from a memory that stores a read symbol and data corresponding to the data read symbol in pairs, and is incorporated into a program that operates on the other electronic unit.

An electronic unit system according to a second aspect of the present invention includes one electronic unit holding a data readout symbol indicating an object to be attached, and a data readout symbol indicating all objects to which the one unit is attached. And a memory for storing data corresponding to the plurality of data read symbols in pairs.
When the one electronic unit is connected, receiving the data read symbol from the one electronic unit, the data corresponding to the supplied data read symbol,
And the other electronic unit that reads the data from the memory using the data readout symbol as a key, incorporates the readout symbol into an operation program, and executes the program.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Embodiment 1 of the present invention will be described with reference to FIG. In FIG. 1, components having the same configuration as the configuration of the occupant protection device already described in FIG. 5 or components equivalent thereto have the same reference characters allotted, and detailed description thereof will be omitted. Only the following will be described.

That is, the first ROM 42 stores a vehicle type to which the occupant protection device (electronic unit) is attached, for example, a symbol U indicating a vehicle type among all vehicle types, together with an operation program of the microcomputer 43. In the second and third ROMs 44 and 46, symbols (data reading symbols) U, V, W, X, Y and Z indicating all types of vehicles to which the occupant protection device is attached,
The parameters (ABCDEFGH corresponding to those vehicle types)
IJ, abcdefghij, jihgfedcba,
JIHGFEDCBA, klmnopqrst, KLM
NOPQRST) (see FIG. 2) together with the microcomputer of the driver-side side occupant protection device 3 and the operation program of the microcomputer 45.

As a result, when the microcomputer 43 and the microcomputer 45 are electrically connected and start operating, the microcomputer 43
When the symbol indicating the vehicle type is read from the second, the microcomputer and the microcomputer 45 of the driver's seat side occupant protection device 3 turn on and off the switching transistors 23 and 25 from the first communication circuit 22 to supply power. Supply via lines 9,12. Thereby, each of the microcomputer and the microcomputer 45 of the driver's seat side occupant protection device 3
A tuning constant corresponding to the vehicle type symbol transmitted from each of the second and third ROMs 44 and 46 is read to optimize each operation program.

For example, when the microcomputer 43 reads the vehicle type symbol U, each of the microcomputer and the microcomputer 45 of the driver's seat side occupant protection device 3 reads the tuning constant ABCDEFGHIJ. When the vehicle type symbol V is read, each of the microcomputers obtains a tuning constant abcdefgh
Read ij. For other vehicle type symbols W, X, Y, and Z, corresponding parameter constants jiggfeedcba,
JIHGFEDCBA, klmnopqrst, KLM
NOPQRST is read. That is, the data transmitted from the microcomputer 43 to each of the microcomputer and the microcomputer 45 of the driver-side side occupant protection device 3 is apparent from a comparison between (A) and (B) of FIG. , The transmission time T2 (<T1) can be shortened.

Embodiment 2 In this embodiment, as shown in FIG. 3, the side collision occupant protection devices 2 and 3 in the first embodiment are replaced with an occupant seating detection device 50. As a whole system, an already known occupant seating detection device is used. 50 is used to determine whether the occupant 52 sitting on the seat 51 is an adult or a child, and to determine whether or not the airbag 53 should be deployed.

First, an outline of the occupant sitting detection device 50 is shown in FIG.
Explaining based on the following, this occupant seating detection device 50
The weight applied to each point on the seating surface of the seat is detected by a weight sensor 50a disposed on the seat, and the weight sensor 50a
Is supplied to the microcomputer 55 via the interface circuit 54, and the microcomputer 55 is controlled by the occupant 5 in accordance with a programmed algorithm.
It is determined whether or not the seat 2 is normal and whether it is an adult or a child, and data on whether or not it is necessary to deploy the airbag 53 at the time of a serious accident is transmitted via the communication circuit 56 to the occupant protection device for a front collision. This is supplied to one microcomputer 43.

The occupant seating detection device 50 is also used for all types of vehicles, and the parameters (determined by the shape and material of the seats) incorporated in the program of the microcomputer 55 can be changed according to the type of vehicle. Is set. That is, as shown in FIG. 2, the ROM 57 stores tuning constants (determined by the material, structure, and shape of the seat) of all vehicle types to which the occupant seating detection device 50 is attached.
Is electrically connected to the front collision occupant protection device 1,
When a signal indicating a vehicle type symbol is supplied from the microcomputer 43 of the frontal occupant protection device 1 to the occupant seating detection device 50, the microcomputer 55 of the occupant seating detection device 50 determines the type of vehicle indicated by the signal and from the ROM 57. The tuning constant is read and the microcomputer 55
And optimize it. Thus, for example, even if a microcomputer having a low processing speed is used as the microcomputer 55, there is no practical problem since the amount of data to be transmitted is small.

[0023]

As described above, according to the present invention, the transmission data can be reduced, so that the transmission time is not greatly affected by the data size such as the tuning constant.
That is, the effect becomes clearer as the data such as the tuning constant becomes larger. Further, if the data size is reduced to, for example, half, the processing speed becomes the same as the conventional one even if the processing speed is doubled.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a circuit block according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a storage state of vehicle type symbols and tuning constants stored in a ROM of FIG.

FIG. 3 is an explanatory diagram for explaining a second embodiment according to the present invention;

FIG. 4 is an explanatory diagram of a circuit block according to a second embodiment in FIG. 3;

FIG. 5 is an explanatory diagram of a conventional circuit block.

6A is an explanatory diagram for explaining a conventional communication state, and FIG. 6B is an explanatory diagram for explaining a communication state according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Front occupant protection device 2 Passenger side occupant protection device 3 Driver side occupant protection device 4 Battery 5 Ignition switch 6 Boost circuit 8 Backup capacitor 9,12 Power supply line 10,13,18,34 Switch circuit 15, 32 Acceleration sensor 16, 28, 43, 45, 55 Microcomputer 17, 36, 41, 42, 44, 46 ROM 19 Discharge diode 20, 35 Detonator 21 Mechanical acceleration switch 22, 29, 56 Communication circuit 23, 25, 30 Switching transistor 31 Resistance 33 Acceleration switch 50 Occupant seating detection device 50a Weight sensor 51 Seat 52 people 53 Airbag 54 Interface circuit 55 Microcomputer

Claims (2)

[Claims] When electrical connection is made between electronic units,
From one electronic unit, a data readout symbol indicating an object to which the electronic unit is attached is transmitted to the other electronic unit, and the other electronic unit receiving the transmitted data readout symbol transmits the data readout symbol to the other electronic unit. With the key as a key, data is read from a memory storing pairs of data readout symbols indicating all objects to which the electronic unit is attached and data corresponding to the data readout symbols, and the other electronic unit is read. How to create an appropriate program to be incorporated into a program that runs on a computer. 2. An electronic unit for holding a data readout symbol indicating an object to be attached, and a data readout symbol indicating all objects to which the one unit is attached, and a plurality of data units. A memory for storing data corresponding to a read symbol in a pair, and when the one electronic unit is connected, receives a data read symbol from the one electronic unit and corresponds to the supplied data read symbol. An electronic unit for reading data to be read from the memory using the data reading symbol as a key, incorporating the read data into an operation program, and executing the program.