JPH09311141A - Data recording method for acceleration sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To mount an acceleration sensor in the inside of an electronic apparatus which processes the output signals of the sensor and efficiently operate the sensor with excellent sensitivity to detect even slight acceleration in a temperature range in which a vehicle is used. SOLUTION: An acceleration sensor 1 is mounted at a prescribed angle in a unit inside in which an output signal processing circuit 2 to process the output signals of the acceleration sensor 1 is built and then the whole body of the resultant unit is installed at a set angle in a thermostatic bath 201. The inner temperature of the thermostatic bath 20 is changed, the output information of the acceleration sensor 1 at every changed temperature is taken in a control computer 203 installed in the outside, the temperature characteristic compensated value of the acceleration sensor 1 is computed, and the obtained value is stored in a memory connected with the output signal processing circuit in the inside of the unit. Consequently, with a downsized and economical structure of the sensor, compensation of temperature characteristic can be carried out at practically sufficient level, so that the sensor can be unitedly built in as a part of a control unit of an auxiliary apparatus for starting on a slope and the number of the installation processes can be lessened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a device developed for use in a hill start assisting device for an automobile, but it can be widely used for applications other than automobiles. INDUSTRIAL APPLICABILITY The present invention utilizes an acceleration sensor in a device mounted in a unit in which an electronic circuit is mounted. The present invention relates to a technique for compensating an error generated in an acceleration sensor due to a temperature change.

[0002]

2. Description of the Related Art The technology of equipping a middle- or large-sized vehicle with a slope start assist device has become widespread. The hill start assist device is where the driver needs to delicately coordinate the timing of the clutch operation and the accelerator operation with the brake release operation when the vehicle starts from a state where the vehicle stops on the hill. , An auxiliary control device used to reduce the burden of this operation. That is, when the vehicle speed becomes zero with the brake pedal depressed, the electronic device of the slope start assist device detects this, and even if the brake pedal is released, the brake pedal is braked until the step allowance of the clutch pedal becomes shallow to a predetermined position. The cylinder pressure is maintained. Therefore, the driver does not have to worry about the vehicle slipping down a slope even if he / she depresses the clutch pedal after starting the slope and releasing the brake pedal after putting the gear in, which makes driving operation extremely easy. Become.

[0003] Such a slope start assist device is mounted on a practical vehicle and has been well received, and various improvements have been made. In particular, it has rapidly become widespread in freight vehicles in which driving conditions must be changed depending on the amount of cargo. This slope start assist device is used not only when starting a slope with a steep slope, but also when driving on a congested road on a level ground, in a driving situation in which start and stop are repeated, which may cause driver fatigue. Will be reduced.

With such an improvement, when the vehicle is stopped, it is an input for controlling whether the vehicle is on a slope or on a level ground, and if it is on a slope, what is the gradient. Needed as information. That is,
When starting on a steep slope, it is preferable to hold the brake pressure until the clutch pedal reaches a sufficiently shallow step allowance, and when starting on a flat road, brake with the clutch pedal still deeply depressed. It would be good to relieve the pressure. For this reason, it has been considered to use an acceleration sensor for detecting the inclination of the vehicle as a sensor input of the slope start assist device (Japanese Patent Laid-Open No. 7-4081).
No. 1). Then, an acceleration sensor for detecting the inclination of the vehicle is attached to the body of the vehicle.

[0005]

Generally, an acceleration sensor has a weight that is balancedly supported by a spring, and has a structure for detecting acceleration by changing the position of the weight. Therefore, the acceleration sensor is a relatively heavy and large component, and the component itself is expensive and requires a space for mounting.

On the other hand, in recent years, small parts have been developed as acceleration sensors. This is a small flat plate-shaped component measuring about 20 mm x 15 mm x 3 mm, inside of which a small plate-like weight having electrodes on its surface is supported by leaf springs, and both sides of which are sandwiched by electrodes. There is. The position of the weight is detected by a slight change in capacitance between the electrodes on both sides.

Unlike the conventional acceleration sensor, such an acceleration sensor does not need to be individually attached to the vehicle body of an automobile, and is integrated inside the device integrally with an electronic circuit for processing the output signal of the acceleration sensor. It can be implemented. In particular, in the case of a hill start assist device, the device can be integrally mounted with an electronic device (computer device) that performs control, and can be configured as a small lunch box or a smaller device as a whole. Such a device can be mounted, for example, on the ceiling of the driver's seat of an automobile, near the driver's rearview mirror, or inside the dashboard.

The inventor believed that such a configuration would make it possible to reduce the size of the entire device and significantly reduce the cost of the device and the number of steps for mounting. The inventor prototyped such a device and tested it, and encountered the following problems.

That is, in the vehicle hill start assist device, the direction of acceleration to be detected is the traveling direction of the car, and the minimum value of the acceleration to be detected necessary for control is one-hundredth unit of the gravitational acceleration. . In order to detect such a small acceleration, it is necessary to orient the sensitive direction of the acceleration sensor to the traveling direction of the automobile and eliminate the influence of the gravitational acceleration. At the same time, the operating temperature range of the automobile is a wide range from −30 ° C. to + 85 ° C., and the above small acceleration cannot be correctly detected in this operating temperature range. In particular, when a large number of the small acceleration sensors were tested, it was found that the temperature characteristics thereof were different from each other, and it was not possible to save even if a compensation circuit having a uniform temperature characteristic was provided.

That is, at the present stage, the slope starting assist device equipped with such an acceleration sensor is effective for the above acceleration unless individual temperature characteristics are individually measured and the temperature compensation is performed individually. Cannot be detected.

The present invention has been made against such a background, and a device in which an acceleration sensor can be mounted inside an electronic device in the same manner as one component of an electronic circuit that processes the output signal of the acceleration sensor. The purpose is to provide. SUMMARY OF THE INVENTION An object of the present invention is to provide an acceleration detection circuit which has an acceleration sensor mounted inside an electronic device and can effectively operate in a temperature range in which an automobile is used. An object of the present invention is to provide a device capable of sufficiently compensating the temperature characteristic to a practical degree even when the variation in the temperature characteristic of the acceleration sensor is large. An object of the present invention is to provide a small and inexpensive acceleration detection circuit. It is an object of the present invention to provide a control unit for a slope start assist device that is small and inexpensive and that can reduce the number of mounting steps.

[0012]

The present invention is characterized in that the output from an acceleration sensor is corrected according to a change in temperature, and control is performed according to temperature-compensated acceleration information.

That is, according to a first aspect of the present invention, after mounting an acceleration sensor at a predetermined angle inside a unit in which the sensor output signal processing circuit is mounted, the entire unit is placed at a set angle in a thermostatic chamber. , The internal temperature of the constant temperature chamber is changed, and the output information of the acceleration sensor corresponding to the temperature is taken into a control computer installed outside the constant temperature chamber, and the temperature characteristic compensation value of the acceleration sensor is controlled by the control computer. Is calculated and the temperature characteristic compensation value is stored in the memory connected to the output signal processing circuit inside the unit.

The operating temperature range of an automobile is from -30 ° C to +8.
Wide range up to 5 ° C. In order to accurately detect the minute acceleration required as control information over such a wide temperature range, the temperature characteristics of each different acceleration sensor are individually obtained in advance, and the compensation value at that temperature is used. Temperature compensation is required.

Therefore, in order to perform this temperature compensation, temperature characteristic data of the acceleration sensor is stored in advance in a memory connected to an output signal processing circuit that processes the output signal of the acceleration sensor. Recording of this temperature characteristic compensation value can be performed for each unit, but it is not efficient, so multiple units are placed in a constant temperature bath, a common temperature cycle is given to these multiple units, and one control computer is used. The temperature characteristic compensation value is calculated for each unit in a time division manner.

In this data recording, it is desirable that a unit in which the acceleration sensor is mounted vertically is arranged horizontally in order to prevent the acceleration sensor from being affected by gravitational acceleration.

The unit can be integrally incorporated in the control unit of the hill start assisting device, whereby the detection value of the acceleration sensor which changes with temperature is compensated by the temperature at that time, and a small change in acceleration is generated. Even if it exists, it can be sent to the slope start assist device as accurate control information. If the temperature-compensated acceleration value is obtained in this way, it will not only be used when the vehicle starts on a slope with a steep slope, but also under driving conditions where the vehicle repeatedly starts and stops when traveling on a congested road on a flat ground. However, the starting assistance operation can be performed according to the inclination of the vehicle at that time, and the function thereof can be expanded.

In a second aspect of the present invention, in the control device for setting the temperature characteristic compensation value of the acceleration sensor, the temperature data of the constant temperature bath and the output information of a plurality of acceleration sensors arranged inside the constant temperature bath are provided. The interface means includes input interface means and a control computer that calculates temperature compensation values for each of the plurality of acceleration sensors from the temperature data and output information of the plurality of acceleration sensors corresponding to the temperature. It is characterized by including means for recording the temperature compensation value calculated by the control computer in a memory connected to the output signal processing circuit of each acceleration sensor.

That is, the interface means inputs the temperature data set in the constant temperature bath and the output information of the plurality of acceleration sensors arranged inside the constant temperature bath and sends them to the control computer. The control computer calculates a temperature compensation value for each of the plurality of acceleration sensors based on the temperature data and output information from the plurality of acceleration sensors corresponding to the temperature. The interface means sends the calculated temperature compensation value to the memory connected to the output signal processing circuit of each acceleration sensor and records it.

In this way, since the temperature characteristic compensation value is individually recorded in the memory to which the acceleration sensor belongs, the acceleration value detected by the acceleration sensor is output signal processing as control information compensated corresponding to the temperature change. Even if a minute change in acceleration is sent to the circuit, the change can be reflected in each control operation.

A third aspect of the present invention is characterized in that, in a memory medium for recording control information, a program capable of having the function of the control computer by being loaded into a personal computer is recorded. By loading a program that becomes a control computer into a memory medium by loading it into a personal computer, the above-described device can be easily set using a general-purpose personal computer. That is, it is possible to calculate a temperature compensation value for each of the plurality of acceleration sensors from the temperature data and the output information of the plurality of acceleration sensors corresponding to the temperature, and record the temperature compensation value in each memory.

According to a fourth aspect of the present invention, the acceleration sensor and the temperature sensor are mounted at a predetermined angle inside a unit in which the sensor output signal processing circuit is mounted, and then the entire unit is arranged at a set angle in a constant temperature bath. Then, the internal temperature of the constant temperature bath is changed, the temperature characteristic compensation value of the acceleration sensor is calculated by the output signal processing circuit in accordance with the temperature sensor output, and the temperature characteristic compensation value is output to the inside of the unit. It is characterized in that it is stored in a memory connected to the signal processing circuit.

The temperature change in the constant temperature bath is detected by the temperature sensor mounted in the unit, the temperature characteristic compensation value is calculated by the output signal processing circuit mounted in the unit corresponding to the detected output, and this output signal processing is performed. Store in a memory connected to the circuit. In this mode, the temperature sensor of the self unit detects the temperature change of the constant temperature tank, and the output signal processing circuit of the self unit calculates the compensation value, so that there is an advantage that the temperature compensation including the temperature sensor can be performed. . This can be achieved without much expense simply by changing the software without using a control computer.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION

[0025]

Next, an embodiment of the present invention will be described with reference to the drawings.

(First Embodiment) FIG. 1 is a diagram showing the structure of the essential parts of the first embodiment of the present invention, and FIG. 2 is a block diagram showing the structure of the essential parts of the first embodiment of the present invention.

In the first embodiment of the present invention, the interface means 202 for inputting the temperature data of the thermostatic chamber 201 and the output information of the plurality of control units 3 arranged inside the thermostatic chamber 201 having the acceleration sensor 1 built therein, and its interface means 202. A control computer 203 for calculating temperature compensation values for each of the plurality of acceleration sensors 1 from temperature data and output information of the plurality of acceleration sensors 1 corresponding to the temperature is provided, and the interface means 202 includes the control computer 203. A means for recording the calculated temperature compensation value in each control unit 3 is included.

The constant temperature bath 201 is provided with a constant temperature bath control unit 204 for changing the internal temperature, and the constant temperature bath control unit 204 is connected to a control computer 203.
The internal temperature is changed according to the operation input from there. A table 205 on which a plurality of (16 in this embodiment) control units 3 can be placed in a horizontal position is provided in the constant temperature bath 201.

If a memory medium in which a program to be the control computer 203 is recorded is loaded into a personal computer, the function of the control computer can be provided.

FIG. 3 is a block diagram showing the structure of the main part of the control unit according to the first embodiment of the present invention. The control unit 3 is configured to be mounted on a slope start assist device, and the acceleration sensor 1 and the output signal processing circuit 2 of the acceleration sensor 1 are built in one control unit 3 to perform output signal processing. The circuit 2 includes a temperature sensor 4 that detects the temperature of the unit as an electric signal, a memory circuit in which temperature characteristic data of the acceleration sensor 1 is stored in advance, and a temperature circuit that refers to the memory circuit according to the output of the temperature sensor 4 to determine the temperature characteristic. And a calculation circuit 5 for calculating the temperature-compensated acceleration according to the data.

The memory circuit includes a dedicated memory EEPR.
The OM 6 is used and data is individually written for the acceleration sensor 1 mounted on the control unit 3. The operation circuit 5 is provided with, as its operation modes, a write mode for writing individual data in the read-only memory 6 and an operation mode for calculating the temperature-compensated acceleration, and either of these two modes is provided. A means for selecting by an input operation from the outside is included. Further, means for setting the influence of the small gravitational acceleration detected by the acceleration sensor 1 to zero is included.

The data written in the dedicated memory EEPROM 6 is the temperature compensation value calculated by the control computer 203.

FIG. 4 is a perspective view showing the structure of the main part of the control unit according to the first embodiment of the present invention, and FIG. 5 is a partial sectional view in the direction of arrow A shown in FIG. 4 for explaining the bent part of the board of the control unit. Is.

In the control unit 3 according to the first embodiment of the present invention, a bent portion 8 having an angle with respect to the surface of the case 7 is formed in a part of the case 7, and the acceleration sensor 1 is attached to the bent portion 8. To be The angle is set so that the gravitational acceleration applied to the acceleration sensor 1 becomes small when the control unit 3 is mounted on the driver's seat ceiling of the vehicle as the object to be detected, near the driver's seat rearview mirror, or inside the dashboard. It A metal material is used for the case 7, and the bent portion 8 is formed by cutting out a part of the case 7.

FIG. 6 is an exploded perspective view showing the structure of the main part of the acceleration sensor used in the first embodiment of the present invention, and FIG. 7 is the B shown in FIG. 6 of the acceleration sensor used in the first embodiment of the present invention. −
8B is a sectional view, FIG. 8A is a plan view showing the outer shape of the acceleration sensor used in the first embodiment of the present invention, and FIG. 8B is a side view thereof.

In the acceleration sensor 1, a first frame body 11 made of an insulator is sandwiched by a second frame body 12 and a third frame body 13 made of an insulator. A weight 15 supported by a leaf spring 14 is built in the first frame body 11, and movable electrodes are formed on both surfaces of the weight 15. Further, fixed electrodes 16 are provided at positions corresponding to the movable electrodes of the second frame 12 and the third frame 13, and the fixed electrodes 16 are formed between both surfaces of the weight 15 and the second frame 12 and the third frame 13. A space is provided between each. This acceleration sensor is sensitive to acceleration in the direction of the arrow shown in FIG.

An acceleration sensor of this type is already on the market as a capacitance type, and an example thereof is shown in FIG. 8 in which a plurality of terminals 17 are provided on the outer circumference and a mounting bracket 18 is provided on the back surface. It is provided.

This acceleration sensor can detect the acceleration in the traveling direction of the automobile and can be set so that the gravitational acceleration applied to the acceleration sensor becomes minute. That is, the acceleration sensor 1 is attached to the case 7 of the control unit 3, and the control unit 3 is a vehicle body that is a detected object.
For example, when mounted on the ceiling of the driver's seat, the angle of the bent portion 8 is adjusted by bending as shown by the arrow in FIG. 5 so that the leaf spring 14 supporting the weight 15 becomes vertical. The influence of gravitational acceleration can be eliminated at all, and even a small acceleration can be detected with high accuracy.

FIG. 9 is a diagram for explaining the detection principle of the acceleration sensor in the first embodiment of the present invention. When the vehicle starts or stops, or when the vehicle is on a slope, the weight (movable electrode) 15 moves in the direction of the arrow, and the weight (movable electrode) 1
The gap d between the fixed electrode 16 and the fixed electrode 5 changes. The change in the gap d changes the dielectric constant. A minute acceleration can be detected by capturing this change in the dielectric constant as an electric signal and processing it.

Next, the slope start assisting device according to this embodiment will be described. FIG. 10 is a block diagram showing a configuration of a main part of a slope start assisting device according to the first embodiment of the present invention.

This slope start assist device is provided with an acceleration sensor 1
A clutch hydraulic pressure switch 101, a brake sensor 102, a clutch sensor 103, a rotation sensor 105 for detecting a vehicle speed and / or an engine rotation speed, and a neutral switch 106 for indicating a neutral position of a speed change lever. , Brake pedal 111
A control valve 109 that holds the brake pressure according to the control signal even when is released, and a program control circuit 100 that outputs the control signal by using the output of each sensor as an input are provided. The program control circuit 100 includes first control means for sending a control signal for holding the brake pressure to the control valve 109 when the output of the brake sensor 102 indicates a braking state and the vehicle speed is zero. A control signal for releasing the brake pressure is sent when the clutch sensor 103 detects a predetermined stroke, indicating the forward start position or the reverse position while the brake pressure is held by the first control means. A second control means and a control means for releasing the brake pressure when the output of the acceleration sensor 1 detects the start of the vehicle regardless of the control signal sent by the second control means.

The driver's seat is provided with the control unit 3 shown in FIGS. 4 and 10 at a position where the driver can operate while driving. The control unit 3 is provided with a main switch 21, a 7-segment display 22, a release adjustment switch 23, and an initial adjustment switch 24.

The main switch 21 is for opening and closing the power supply to the apparatus. In this example, if the switch knob is raised, the switch is closed to drive the apparatus, and if it is lowered, it is stopped. 7-segment display 22 is decimal point 2
This is a 7-segment numeral display with a numeral, and a numeral is displayed in the course of adjustment.

The data recording operation of the acceleration sensor 1, which is a feature of the present invention, will now be described. First,
After mounting the acceleration sensor 1 vertically in the control unit 3 in which the sensor output signal processing circuit 2 is mounted, the entire control unit 3 is horizontally arranged in the thermostatic chamber 201,
The internal temperature of the constant temperature bath is changed, and the output information of the acceleration sensor 1 corresponding to the temperature is fetched into the control computer 203 installed outside the constant temperature bath 201. The control computer 203 calculates the temperature characteristic compensation value of the acceleration sensor 1 and stores the temperature characteristic compensation value in the EEPROM 6 connected to the output signal processing circuit 2 inside the control unit 3.

A plurality of thermostats (in this embodiment, 1
(6) control units are arranged, a common temperature cycle is given to the plurality of control units 3, and one control computer 203 calculates temperature characteristic compensation values for the plurality of control units 3 in a time division manner.

A more detailed description will be given according to the flow of the compensation value recording operation shown in FIG. Control computer 20
3 is operated and the temperature K is set in the constant temperature bath control unit 202.
When the measurement point setting command of (A, B, C, D, E) is issued, the control computer 203 causes the plurality of measurement points A, B within the specified temperature range (for example, −30 ° C. to + 85 ° C.). The detection outputs of the temperature sensor 4 and the acceleration sensor 1 at C, D, and E are taken in. Since the control units 3 are mounted on the horizontal base 205, respectively, the mounted acceleration sensor 1 is at an angle of substantially zero degree where the influence of gravitational acceleration is small. Using the output of the acceleration sensor 1 in this state as a standard value (for example, 2.5 V), the difference from the output value at each measurement point acquired is calculated, and the acceleration sensor 1 including the output value of the temperature sensor 1 is individually calculated. 12 is recorded as the characteristic value for each temperature measurement point in the table shown in FIG. Next, when the write mode is set in the control computer 203 by an operation, the control computer 203 individually stores the characteristic value in the dedicated memory EEPROM 6 of each control unit 3. Each control unit 3 in which the characteristic value is stored is individually mounted in each vehicle.

Next, the compensation operation of the detected acceleration by the control unit 3 in which the compensation value is stored in the EEPROM 6 will be described. FIG. 13 is a flow chart showing the flow of the compensation operation of the detected acceleration by the arithmetic circuit of the control unit in the first embodiment of the present invention.

When the calculation mode is set by turning on the main switch 21 of the control unit shown in FIG. 2, the calculation circuit 5 takes in the detection outputs from the acceleration sensor 1 and the temperature sensor 4, and refers to the EEPROM 6 to find the corresponding temperature range. Capture the data. For example, the acceleration sensor 1 is shown in FIG.
Assuming that the temperature sensor 4 measures 23 ° C. having the characteristics shown in (a), its temperature range is D
It is between the point (15 ° C) and the E point (30 ° C). The coefficient in this temperature range (D-E) is calculated. The coefficient is calculated by (compensation value) / (temperature). For example, as shown in FIG. 14B, the temperature at point D is 15
C, the compensation value is t ₁₅ , the temperature at the E point is 30 ° C., and the compensation value is t ₃₀ , the coefficient k is k = (t ₃₀ −t ₁₅ ) / (30 ℃ - 15 ℃) = - a _{(t 30 t 15) / 15} ℃.

The compensation value of the control unit 3 is calculated from the coefficient k and the output of the temperature sensor 4 that has been taken in. In this example, the compensation value is k × 23 ° C. The value thus compensated is sent to the program control circuit 100 shown in FIG. 10 for controlling the hill start assist device. The program control circuit 100 controls the hill start assisting operation according to the compensated acceleration value. The embodiment of the present invention is provided with a means for setting the influence of the gravitational acceleration to zero.

As shown in FIG. 4, the bent portion 8 of the case 7
When the control unit 3 to which the acceleration sensor 1 is attached is mounted on the vehicle body and the vehicle body is placed on the horizontal surface plate, the control unit 3 takes in the output signal from the acceleration sensor 1 and calculates the difference (δ) from zero. Record as data. Since this difference (δ) becomes the compensation value of the acceleration of the vehicle, every time the current acceleration (α _C ) detected when the vehicle moves is taken in, α _C −δ is calculated to obtain the true acceleration α. It is sent to the program control circuit 100 as an electric signal. The program control circuit 100 controls the hill start assisting operation based on this output signal.

When the vehicle is placed on the surface plate, the difference with respect to zero may not be within the allowable value due to the accumulated error. In such a case, the board is removed from the vehicle body and the bending portion 4 is used. The effect of gravitational acceleration can be removed by mechanically correcting the angle of.

Next, the operation of the slope starting assistance device according to the embodiment of the present invention will be described.

The program control circuit 100 includes a brake
The output from the sensor 102 is taken in and it is determined whether or not the preset value of the depression amount is exceeded. If it does not exceed the set value, it means that the vehicle is not stopped due to braking, and therefore the sending of the control signal to the control valve 109 is prohibited and the auxiliary operation for starting the slope is stopped. If the value exceeds the set value, the output from the vehicle speed sensor 105 is fetched to determine whether the vehicle speed is zero. If the vehicle speed is not zero, the vehicle is running, so the sending of the control signal to the control valve 109 is prohibited and the auxiliary operation for starting the slope is stopped.

When the vehicle speed is zero, the output from the acceleration sensor 1 is fetched, and it is determined whether or not the current gradient exceeds the set predetermined value S. If the slope exceeds the predetermined value S, it is determined that the vehicle is on a road that is not covered by the hill start assisting ability, and the sending of the control signal to the control valve 109 is prohibited and the assisting operation is stopped. If the predetermined value S is not exceeded, a control signal is sent to the control valve 109, assuming that the vehicle is on a road capable of assisting the start of a slope, the control valve 109 is driven, and the brake valve 112 is operated to execute the assist operation for starting the slope. .

Next, the brake releasing operation will be described.

When the output from the clutch sensor 103 is received while the vehicle is in the brake holding state on a slope, it is determined whether the clutch is depressed and the gear is set to the forward start position (low or second) or the reverse position. To judge.

When the clutch is depressed and the gear is set to the starting state, it is judged from the output of the clutch sensor 103 whether or not the stroke is equal to or less than a predetermined stroke set in advance. When the stroke is equal to or less than the predetermined stroke, it is assumed that the vehicle is started, and the sending of the control signal to the control valve 109 is prohibited and the brake is released.

When the accelerator is not stepped on, the gear is not set to the starting state, or the amount of stepping on the clutch is more than a predetermined stroke, the control signal is continuously sent to the control valve 109 to maintain the brake holding state. To do.

When the acceleration sensor 1 detects the start of the vehicle while the clutch is stepped on and the gear is moving forward or backward, the program control circuit 100 detects whether the clutch has reached a predetermined stroke or not. Immediately, the interrupt control is performed, the sending of the control signal to the control valve 109 is prohibited, and the brake pressure is released.

The initial setting of the clutch and the brake can be arbitrarily performed by adapting to the preference of the driver or the change due to the wear of the brake and the clutch. The set stroke values of the clutch pedal and the brake pedal 111 are held until they are reset.
If each stepping stroke does not exceed the set reference value, the program control circuit 100 prohibits the sending of the control signal to the control valve 109 to stop the starting assist operation, and each stepping stroke is set. If it exceeds the reference value, the start assist operation is continued. When the main switch 21 is turned off, the power supply to the device is stopped and the starting assist operation is not performed.

In this embodiment, the temperature characteristic of the acceleration sensor 1 is stored in the read-only memory 6 with the case 7 of the control unit 3 shown in FIG. Alternatively, the temperature characteristics may be measured by the control computer by using a combination of 6 and 6 as one component. That is, a compensation value is calculated, and data relating to the compensation value is stored in advance in the read-only memory 6 in association with the acceleration sensor 1. By adopting such a configuration, it becomes unnecessary to measure the temperature characteristics of each unit for the whole amount when mass production progresses.

(Second Embodiment) In the second embodiment of the present invention, the acceleration sensor 1 and the temperature sensor 4 in the first embodiment are installed inside a control unit 3 in which an output signal processing circuit 2 for processing the outputs thereof is mounted. After mounting at a predetermined angle, the entire control unit 3 is placed in the thermostatic chamber 201 at a set angle,
The internal temperature of the thermostatic chamber 201 is set to the thermostatic chamber control unit 20.
4, the temperature characteristic compensation value of the acceleration sensor 1 is calculated by the arithmetic circuit 5 of the output signal processing circuit 2 in accordance with the output of the temperature sensor 4, and the calculated temperature characteristic compensation value is connected to the arithmetic circuit 5. It is directly stored in the EEPROM 6.

In this embodiment, the detection data fetched by the control computer 203 and the compensation value calculation can be performed in its own unit, so that the temperature characteristic compensation value including the temperature sensor 4 can be obtained. There are advantages.
Further, since the output signal processing circuit 2 can be provided with the function by software, it can be realized without much expense.

[0064]

As described above, according to the present invention, the acceleration sensor can be mounted inside the electronic device for processing the output signal of the acceleration sensor and can be effectively operated in the temperature range in which the automobile is used. Further, the temperature characteristics can be compensated to a practically sufficient degree with a small and inexpensive structure. Also,
It is possible to integrally incorporate the acceleration sensor as one component into the control unit of the slope start assist device. As a result, the man-hours for mounting the slope start assist device can be reduced.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a main part of a first embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a main part of the first embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a main part of a control unit according to the first embodiment of the present invention.

FIG. 4 is a perspective view showing a configuration of a main part of a control unit according to the first embodiment of the present invention.

FIG. 5 is a partial cross-sectional view in the direction of arrow A shown in FIG. 4 for explaining the bent portion of the board of the control unit according to the first embodiment of the present invention.

FIG. 6 is an exploded perspective view showing the structure of the main part of the acceleration sensor used in the first embodiment of the present invention.

FIG. 7 is a sectional view taken along line BB shown in FIG. 6 of the acceleration sensor used in the first embodiment of the present invention.

FIG. 8A is a plan view showing the outer shape of the acceleration sensor used in the first embodiment of the present invention, and FIG. 8B is a side view thereof.

FIG. 9 is a diagram illustrating the detection principle of the acceleration sensor used in the first embodiment of the present invention.

FIG. 10 is a block diagram showing a configuration of a main part of a slope start assisting device according to the first embodiment of the present invention.

FIG. 11 is a flowchart showing the flow of a compensation value recording operation by the control computer in the first embodiment of the present invention.

FIG. 12 is a diagram showing a table for recording characteristic values of the acceleration sensor according to the first embodiment of the present invention.

FIG. 13 is a flowchart showing a flow of a compensation operation of detected acceleration by an arithmetic circuit of the control unit in the first embodiment of the present invention.

FIG. 14A is a diagram showing an example of a compensation value of an acceleration sensor detection value in the first embodiment of the present invention, and FIG. 14B is a diagram illustrating calculation of a compensation value between measurement points.

[Explanation of symbols]

 1 Acceleration sensor 2 Output signal processing circuit 3 Control unit 4 Temperature sensor 5 Calculation circuit 6 EEPROM 7 Case 8 Bending part 11 First frame 12 Second frame 13 Third frame 14 Leaf spring 15 Weight 16 Fixed electrode 17 terminal 18 mounting bracket 21 main switch 22 7-segment display 23 release adjustment switch 24 initial adjustment switch 25 decimal point 100 program control circuit 101 clutch hydraulic switch 102 brake sensor 103 clutch sensor 105 vehicle speed sensor 106 neutral switch 109 control Valve 111 Brake pedal 112 Brake valve 201 Constant temperature chamber 202 Interface means 203 Control computer 204 Constant temperature chamber control unit 205 units

Claims (7)

[Claims] 1. An acceleration sensor is mounted at a predetermined angle inside a unit in which the sensor output signal processing circuit is mounted, and then the entire unit is arranged at a set angle in a thermostatic chamber,
The internal temperature of the constant temperature bath is changed, and the output information of the acceleration sensor corresponding to the temperature is taken into a control computer installed outside the constant temperature bath, and the temperature characteristic compensation value of the acceleration sensor is obtained by the control computer. A method for recording data of an acceleration sensor, which comprises performing a calculation and storing the temperature characteristic compensation value in a memory connected to the output signal processing circuit inside the unit. 2. A plurality of the units are arranged in one constant temperature bath, a common temperature cycle is given to the plurality of units, and the temperature characteristic compensation value is time-divided for the plurality of units by one control computer. The data recording method of the acceleration sensor according to claim 1, wherein 3. The data recording method for an acceleration sensor according to claim 1, wherein the predetermined angle is substantially vertical and the set angle is horizontal. 4. The acceleration sensor data recording method according to claim 1, wherein the unit is a slope start assist device. 5. Interface means for inputting temperature data of a constant temperature bath and output information of a plurality of acceleration sensors arranged inside the constant temperature bath, and temperature data and outputs of the plurality of acceleration sensors corresponding to the temperature. And a control computer that calculates temperature compensation values for each of the plurality of acceleration sensors from information, and the interface means is connected to the output signal processing circuit of each acceleration sensor for the temperature compensation values calculated by the control computer. A control device comprising means for recording in a memory. 6. A memory medium having a program recorded therein, which becomes a control computer according to claim 5 when loaded into a personal computer. 7. The acceleration sensor and the temperature sensor are mounted at a predetermined angle inside a unit in which the sensor output signal processing circuit is mounted, and then the entire unit is placed at a set angle in the constant temperature tank, and the inside of the constant temperature tank is set. The temperature is changed, the temperature characteristic compensation value of the acceleration sensor is calculated by the output signal processing circuit corresponding to the temperature sensor output, and the temperature characteristic compensation value is connected to the output signal processing circuit inside the unit. A data recording method for an acceleration sensor, characterized by storing the data in a memory.