JPS6349567A - Control device for vehicle - Google Patents

Abstract

PURPOSE:To prevent misdetection of operational condition of a vehicle, just after the start of operation of a control means, by enabling that a detected signal of an operational condition detecting means is read and input into the control means, after preset period of time passes from the start of operation of the control means. CONSTITUTION:An operational condition detecting means A adapted to detect the operational condition of a vehicle, is set, an operation of a control means B is stopped when the motion voltage becomes lower than the preset degree, and the operation is started when the motion voltage becomes higher than the preset degree, for operating a controller of the vehicle according to the operational condition of the vehicle, by the control means B in which the output signal of the operational condition detecting means A is input. In this control device, a operation start detecting means C adapted to detect the operation starting time, is set, for starting the operation of a time counting means D when it is detected that the operation is started. Then, after the counted time reaches the preset value, it is enabled that the detected signal of the operational condition detecting means A is read and input into the control means B, by a read and input enabling means E.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a vehicle control device that reads a detection signal from a vehicle speed sensor or the like and controls various devices of the vehicle based on the detection signal.

<Prior Art> Conventional examples of vehicle control devices include the following.

That is, as shown in FIG. 4, a vehicle speed sensor 1 consisting of a reed switch that opens and closes depending on the vehicle speed is connected to an input terminal of an inverter 4 via a diode 2 and a smoothing circuit 3 for noise prevention, and the output signal of the inverter 4 is connected to the input terminal of the inverter 4. is input to the microcomputer 5.

The microcomputer 5 also has a battery power supply U3.
A predetermined constant voltage VCC, which is lowered by the constant voltage control circuit 6 and the transistor 7, is applied as an operating voltage.

The microcomputer 5 stops operating and is reset to an initial state when the operating voltage becomes less than a predetermined reset detection level, and starts operating (starts up) when the operating voltage becomes equal to or higher than the reset detection level. ing.

Society, Microcomputer 5 is jJL! The vehicle speed signal from the sensor is read in with other detection signals, and the steering assist force of the power steering device, for example, is determined from the vehicle speed.

The microcomputer 5 then assists the steering force of the vehicle based on the obtained steering assist force.

Further, a constant voltage VCC formed by the transistor 7 is applied to a lead wire connecting the inverter 2 and the smoothing circuit 3 via a pull-up resistor 8 as a power source for forming a signal of the vehicle speed sensor 1.

In addition, 9 is a diode, 10 is a smoothing circuit for noise prevention,
11 is a smoothing capacitor, and 12 is a resistor.

<Problems to be solved by the invention> However, in such conventional control devices,
If a momentary interruption occurs in the battery power source U, line connector, etc., the application of operating voltage to the microcomputer 5 is stopped, resulting in the following problems.

That is, as shown in FIG. 5, when the operating voltage falls below the reset level as the voltage from the buffer power supply Us decreases, the operation of the microcomputer 5 stops. Thereafter, when the voltage of the battery power supply U is restored and the operating voltage becomes equal to or higher than the reset detection level, the microcomputer 5 is reset and activated. At this time, the capacitor 3a of the smoothing circuit 3 is not sufficiently charged, and the input voltage of the inverter 4 is maintained at L for a predetermined time, during which time the output of the inverter 4 becomes H as shown in FIG.

Therefore, even if the actual vehicle speed is zero, the microcomputer 5 may erroneously read the vehicle speed from the output of the inverter 4 immediately after the start of startup.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a vehicle control device that can prevent false detection even if a momentary power outage or the like occurs.

Means for Solving the Problems> Therefore, as shown in FIG. On the other hand, when the operating voltage becomes equal to or higher than a predetermined value, the operation is started, and after the start of the operation, the detection signal from the driving state detection means A is read and the control equipment of the vehicle is controlled based on the detected value. A control device for a vehicle comprising: a control means B for controlling a vehicle; an operation start detection means C for detecting the start of the operation; a timer for starting time measurement when the start of the operation is detected; reading permission means E for permitting the control means B to read the detection signal sent to the driving state detection means after the driving state detection means reaches the specified value.

In this way, the control means can read the detection signal after a predetermined period of time has elapsed from the start of the operation of the control means, thereby making it possible to prevent false detection immediately after the start of the operation.

<Example> An example of the present invention will be described below based on FIGS. 2 and 3. Incidentally, the same elements as in the conventional example are given the same reference numerals as in FIG. 4, and the explanation thereof will be omitted.

In the figure, a vehicle speed signal is inputted to a microcomputer 20 via an inverter 4 from an inch-inch vehicle speed sensor 1 serving as driving state detection means.

The microcomputer 20 also includes a constant voltage control circuit 6.
A constant voltage lowered by the transistor 7 is applied as an operating voltage.

The microcomputer 20 stops operating and is reset to an initial state when the operating voltage becomes less than a predetermined reset detection level, and starts up when the operating voltage becomes equal to or higher than the reset detection level.

Furthermore, when the microcomputer 20 is started, it operates according to the flowchart shown in FIG. 3.

Here, the microcomputer 20 constitutes a control means (particularly a CPU), an operation start detection means, a clock means, and a reading permission means.

Next, the operation will be explained according to the free chart in FIG.

When the operating voltage falls below the reset level, the microphone! :1
-1 The videoter 20 starts booting up. Then, the timer starts counting from the start of activation at Sl.

In S2, it is determined based on the count value of the timer whether a predetermined period of time has elapsed from the start of startup, and if YES, the process proceeds to S3.
If the answer is No, the process advances to S3.

In S3, reading of the vehicle speed signal into the microcomputer 20 (particularly the CPU) is permitted.

After this, the microcomputer 20 reads the vehicle speed signal detected by the vehicle speed sensor 1.

Then, the microcomputer 20 determines, for example, a steering assist force based on the read vehicle speed signal, and uses a signal corresponding to this steering assist force to control the power steering device to assist the steering force.

As explained above, since the vehicle speed signal is read after a predetermined time has elapsed after the microcomputer 20 starts to start, even if the microcomputer 20 is started after being reset due to a momentary disconnection of the connector, etc. The vehicle speed sensor 1 is not read immediately after starting. Therefore, even if an abnormal signal is input from the inverter 4 immediately after startup, the signal is used as the vehicle speed signal and the microcomputer 2
Since 0 is not read, false detection can be prevented.

<Effects of the Invention> As explained above, the present invention prevents the detection signal of the operating state detection means from being read until a predetermined period of time has elapsed after the control means is activated, so that an erroneous error occurs immediately after the start of activation. Even if a detection signal is input, the detection signal is not read, thereby preventing false detection.

[Brief explanation of drawings]

Fig. 1 is a claim correspondence diagram of the present invention, Fig. 2 is a configuration diagram showing an embodiment of the present invention, Fig. 3 is a flowchart of the same as above,
FIG. 4 is a configuration diagram showing a conventional example, and FIG. 5 is a time chart for explaining the drawbacks of the conventional example. 1...Vehicle speed sensor 3...Smoothing circuit 4...
Inverter 20...Microcomputer Patent Applicant Kuchiki Electronics Co., Ltd. Agent Patent Attorney Fujio SasashimaFigure 1Figure 3Figure 2TO5

Claims (1)

[Claims] a driving state detection means for detecting the driving state of the vehicle; and a driving state detection means that stops the operation when the operating voltage becomes less than a predetermined value, starts the operation when the operating voltage becomes equal to or higher than the predetermined value, and after the start of the operation, the A control device for a vehicle comprising: a control means for reading a detection signal from a driving state detection means and controlling a control device of the vehicle based on the detected value; and a reading permission means for permitting reading of the detection signal of the driving state detection means into the control means after the measured time reaches a predetermined value. A vehicle control device characterized by: