JPS5850845A - Communication method between control terminals of controllers for vehicle - Google Patents

Abstract

PURPOSE:To smoothly control a low-priority control terminal which does not synchronize with the clock of a system, by actuating the low-priority control terminal by an actuation request signal outputted from a high-priority control terminal, and then transmitting and receiving data at the clock timing of the high-priority control terminal. CONSTITUTION:A vehicle controller which has a low-priority control terminal annexed to plural high-priority control terminals is provided to transfer data intermittently between a high-priority terminal and the low-priority terminal at the clock timing of the system. For transmission and reception between one column control terminal (high priority) 16 and steering control terminal (low priority) 28 of this controller, when the terminal 28 is actuated, the terminal 16 is also actuated by an actuation request signal from the terminal 28 and then in response to an actuation request signal outputted by the terminal 16, data is transmitted and received at the timing. Further, the terminal 28 is actuated by the actuation request signal of the terminal 16 to transmit and receive data at the timing of the terminal 16.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a communication method between control terminals of a vehicle control device, and is particularly suitable for use in one automobile, and includes a high-level control terminal whose clock is synchronized with the clock timing of the system; The present invention is applied to intermittent data transmission and reception between an upper control terminal and a lower control terminal in a vehicle control device having a lower control terminal whose clock is not synchronized with the system clock timing.

The present invention relates to a communication method between control terminals of a vehicle control device.

In general, the power supply for computers that are powered by 2 commercial power sources is:
While the equipment is in operation, it is always on, and in some cases a power backup device is installed to maintain full power even during a power outage. On the other hand, computers are not only used stationary in vehicles such as automobiles, but are also being installed in vehicles such as automobiles and used for controlling the engines of automobiles. When used to control equipment that is constantly used during vehicle operation, the engine control computer is powered on at all times when the ignition switch for igniting the vehicle engine is turned on. Since it has to be kept on, there is no difference from conventional computers in terms of power supply and communication methods. However, due to advances in computer and communication technology, when computers are used not only to control the engine but also to control other equipment that is used intermittently, such as headlights, horns, wipers, stop lamps, turn signal lamps, etc. Similarly to the conventional engine control computer, if the computer that controls the relevant equipment is kept powered on all the time while the vehicle is in operation, the power consumption of the entire vehicle will be large, especially in limited areas such as automobiles. Vehicles that use high-capacity batteries as a power source have a problem in that the batteries may become exhausted and cause vehicle failure. In addition, in computers that are always powered on while the equipment is in operation, such as conventional computers that are used stationary, it is necessary to synchronize all four control terminals that make up the control device with the system clock timing. By keeping the clocks synchronized with the system clock timing, it is possible to easily communicate between each control terminal, but it is difficult to synchronize the clocks with the system clock timing. In some cases, a control device is configured with a lower control terminal whose clock is not synchronized with the system clock timing. In such cases, the clock timing of the upper control terminal and lower control terminal must be Since they were not synchronized, the problem was how to send and receive data between the two.

The present invention has been made to solve the above-mentioned conventional drawbacks, and even in a vehicle control device having an upper control terminal and a lower control terminal whose clock timings are not synchronized with each other, each control It is an object of the present invention to provide a communication method between control terminals of a vehicle control device that can smoothly transmit and receive data between the terminals.

The present invention provides an upper control terminal and a lower control terminal in a vehicle control device having an upper control terminal whose clock is synchronized with the system clock timing and a lower control terminal whose clock is not synchronized with the system clock timing. When a lower control terminal is activated during intermittent data transmission/reception, the upper control terminal is first activated in response to the activation request signal output from the lower control terminal, and then in response to the data request signal output from the upper control terminal. data is sent and received at the clock timing of the upper control terminal.
When the higher-level control terminal starts up, the lower-level control terminal is first activated by the activation request signal output from the higher-level control terminal, and then data is transmitted and received at the clock timing of the higher-level control terminal to achieve the above purpose. That's what I did.

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows an example of an automobile control device to which communication between control terminals of a vehicle control device according to the present invention is applied. In the figure, 10 is an upward headlamp 10a;
The left front control terminal 1242 has accessory equipment such as a downward headlamp 10b, a front turn signal lamp 10C, a horn 10d, etc., a shift position switch 12&, a wiper motor 12b1, a left door control terminal 14, a column control terminal terminal 16, etc. as accessory equipment. Left side cowl control terminal, 18, courtesy switch 1811, rear wiper motor 18b, rear washer motor 18@, stop rank 18d5, rear turn signal lamp 18, tail lamp 18f, back lamp 18g1, rear window differential 18h, combustion! ) sensor 181. ) A rear control terminal 20 has a rank opener solenoid 18j and the like as accessory devices, and 20 is a steering lock switch 20a and an ignition solenoid 20b1.
A right cowl control terminal 26 includes a vehicle speed sensor 20e, an x-top switch 20d, a parking brake switch 2o, a sunroof switch 20f, a sunroof motor 20g, a meter control terminal 22, a right door control terminal 24, etc. as accessories, and 26 is an upward-facing headlamp. 2
6a1 Downward head rung 26b5 Front turn signal lamp 26c1 Horn 26d1 Washer motor 2
6. This is a right front control terminal that has an engine oil pressure switch 261 and the like as accessory equipment. Of each control terminal, the right front control terminal 10, the left cowl control terminal 12, the rear control terminal 18,
Right side cowl control 1 terminal 20. The right front control terminal 26 is the highest level control terminal, and each of these highest level control terminals has an input/output line 31.
It is tied by ~40.

The left cowl control terminal 12 also has a power window control switch 1 as its lower control terminal.
4m, a left side door control terminal 14, which has a power window motor 14b, a door lock lens 14@, a courtesy lamp 1411, etc. as accessories. and a hazard switch 16a.

Hazard illumination lamp 16b1 light control switch 16@
, 'Column control terminal with fiber control match 16d1 washer control switch 16, ignition switch 16f, X-tearing control terminal 28, etc. as attached equipment! The left side door control terminal 14 and the column control terminal 16 are connected to the left cowl control terminal 12 by input/output lines 41.42 and 43.44, respectively. The column control terminal 16 is further equipped with a steering control terminal 28, which has a horn gear f 28m and an auto drive control switch 28b% as accessory devices, as a lower control terminal.
46 to the column control terminal 16.

Further, the right cowl control terminal 20 has a display Is22m and an alarm 2 as lower control terminals thereof.
Meter control terminal 2 with 2b etc. as attached equipment
g, and power win)' control match 24a1 power window motor 24b1 door lock solenoid 24@
, a courtesy lamp 24d, etc. are provided as attached devices.
They are connected to the right cowl control terminal 2o by input/output lines 47.48 and 49.5o, respectively.

In the meter control terminal 22, a display 22
m displays vehicle speed, driving status (economical driving or not), shift position of the mass transmission, remaining fuel level, etc., as well as door ajar warning, brake fluid level warning, seatbelt fastening warning, and catalyst rapid heating warning. , engine oil pressure warning, fuel shortage warning, charging warning, lamp breakage warning, etc. are displayed, and furthermore, the alarm 22b is designed to issue a vehicle speed warning, a warning before the turn signal lamp flashes, etc.

Among the control terminals, the topmost control terminal is the left front control terminal 10, the left cowl control terminal 12, the rear control terminal 18, and the right cowl control terminal 20. Right front control terminal 26
, and 5. A left door control terminal 14 and a column control terminal 16, which are lower control terminals of the left cowl control terminal 12, and the right cowl control terminal 2.
Meter control terminal 2, which is the lower control terminal of ゜
2 and the right door control terminal 24, whose clocks are synchronized with the system clock timing, while the steering control terminal 28, which is the lower control terminal of column IFIJlill/-tfk16,
clock is not synchronized with the system clock timing.

Below, the upper control terminal is column control terminal 16
Taking as an example the case where the lower control terminal is the steering control terminal 28, a method of intermittent data transmission and reception between the upper control terminal and the lower control terminal will be described. First, when the ignition switch 16f is off and each control terminal is off,
Horn turn-in of steering control terminal ζ terminal 28 + 2
8a is pressed. In this case, first, the steering control terminal 28 sends an output including a start request signal as shown in FIG. When a signal is input to the column control terminal 16 (time t1), the column control terminal 16 is activated in response to the activation request signal A, and at time 1. Than,
A data request signal B synchronized with the system rotation is outputted to the steering control terminal 28 via the input/output line 46.

This data request signal B includes, for example, 5 digits longer than the data.
Bit stop bit 8TO! ', 1-bit start bit BT, and turn signal lamp blinking signal D
0, DI, a hazard signal, an ignition switch-on signal Da, and a parity bit P. In response to this data request signal B, the steering control terminal 28 sends a data signal C including a communication line confirmation code to the column control terminal 16 from time ts.

The data signal C sent from the steering control terminal 28 to the column control terminal 16 includes, for example,
3-bit communication line confirmation code 101, turn signal lamp flashing signal, D, horn switch on signal DI, auto drive control signal, ~D? By repeating data transmission and reception of 0 or more including 0, alarm switching signal, D-, and parity bit P, data transmission and reception between the steering control terminal 28 and the column control terminal 16 is performed. This is done smoothly in synchronization with the system clock timing.

The end of communication is determined by not transmitting or receiving data between the steering control terminal 28 and the column control terminal 16 for a predetermined period of time or more. rop is turned off. When the communication between the steering control terminal 28 and the column control terminal 16 is completed in this way, communication is then carried out between the plum control terminal 16 and the left cowl control terminal 12 which is its upper control terminal, and then When communication occurs between the control terminals and, for example, the horn switch 28m is pressed, the horn 10d, which is an accessory to the left front control terminal 10, and the horn 264, which is an accessory to the right front control terminal 26, are activated. both issue an alarm.

On the other hand, when the ignition switch JF-16f is on, if you want to check the status of the lower control terminal than the higher control terminal, for example, you want to confirm the status of the auto drive control switch 28b of the steering control terminal 28 from the column control terminal 16. In this case, from the column control terminal 16 via the input/output line 46,
The activation request signal E and the following data request signal B as shown in ) are output to the steering control terminal 28 (time Jl) *Then, the steering control terminal 28 outputs the following data as shown in the third image). It is activated in response to the activation request signal E, and in response to the data request signal BK, a data signal C including a communication line confirmation code is sent to the column control terminal 16 via the input/output line 45 from time to time. Output to. By repeating the data transmission and reception as described above, data transmission and reception between the steering control terminal 28 and the column control terminal 16 is smoothly performed in synchronization with the system clock timing.

The end of communication is determined by not transmitting or receiving data between the steering control terminal 28 and the column control terminal 16 for a predetermined period of time or more, and in response, the 5-bit stop bit 5TOP output from the column control terminal 16 is turned off. It is said that In this way, the state of the autodrive control switch 28b of the steering control terminal 28 can be checked from the column control terminal 16 side, and data is transmitted and received between the left cowl control terminal 12 and the column control terminal 16 accordingly. Further, data is transmitted and received between the respective top-level control terminals, and necessary processing such as one-time adjustment of the accelerator is performed.

In the above embodiment, the upper control terminal is the column control terminal, and the lower control terminal is the steering control terminal, but the upper control terminal or the lower control terminal is not limited to this. It is clear that the invention is equally applicable to communication between a higher level control terminal, whose clock is synchronized with the system clock timing, and a lower level control terminal, whose clock is not synchronized with the system clock timing. .

As described above, according to the present invention, intermittent data transmission and reception between a higher control terminal whose clock is synchronized with the system clock timing and a lower control terminal whose clock is not synchronized with the system clock timing is facilitated. It has the excellent effect of being able to perform

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an example of an automobile control system pupil to which the communication method between control terminals of a vehicle control system according to the present invention is applied, and Figs. FIG. 3 is a diagram showing a situation where the communication method according to the present invention is implemented between a column control terminal and a steering control terminal in FIG. 16...Column control terminal (upper control terminal), 2i...Steering control terminal (lower control terminal). Agent Takaya Ron (and 1 other person)

Claims (1)

[Claims] (1) Upper control terminal and lower control in a vehicle control device having an upper control terminal whose clock is synchronized with the system clock timing and a lower control terminal whose clock is not synchronized with the system clock timing. When a lower control terminal 2 starts up during intermittent data transmission/reception between terminals, the upper control terminal is first started by the activation request signal of the output of the lower control terminal, and then the output of the upper control terminal is activated. Data is transmitted and received at the clock timing of the upper control terminal in accordance with the data request signal. On the other hand, when the upper control terminal starts up, first the lower control terminal is started up by the start request signal of the output of the upper control terminal, and then A communication method between control terminals of a vehicle control device, characterized in that data is transmitted and received at clock timing of a higher-level control terminal.