WO2011122327A1

WO2011122327A1 - Control device

Info

Publication number: WO2011122327A1
Application number: PCT/JP2011/056024
Authority: WO
Inventors: 阿相竜治; 太一結城
Original assignee: 株式会社ケーヒン
Priority date: 2010-03-29
Filing date: 2011-03-15
Publication date: 2011-10-06
Also published as: JP2011209923A; CN103238132A

Abstract

A control unit (12) causes an A/D converter (11) to perform A/D conversion for only analogue signals received from those sensors among a plurality of sensors (SR1 to SR8) required in processing to be executed by the control unit to control the operation of an electric component. The control unit (12) thereby obtains only digital signal data required in the processing, and reads out only the digital signals required in the processing.

Description

Control device

The present invention relates to a control device that controls electric parts of a vehicle, and more particularly, to a control device including an analog / digital converter that converts an analog signal into a digital signal.

In recent years, various electric parts are mounted on vehicles such as automobiles, and in order to control such electric parts with high accuracy, analog signals from various sensors that detect physical quantities indicating the operating state of the internal combustion engine of the vehicle are used. A control device including an analog / digital converter (hereinafter referred to as an A / D converter) that performs analog / digital conversion (hereinafter referred to as A / D conversion) for conversion into a digital signal is used.

In such a control device, the number of electrical components to be controlled tends to increase, and since it is required to control such a large number of electrical components with higher accuracy, the A / D of the control device is required. The load on the converter also tends to increase.

Patent Document 1 discloses an A / D conversion based on a channel activation signal sequentially sent from a time synchronization register 32 in order to reduce a processing load on a control circuit in controlling an A / D converter 14 having a plurality of input channels. When the A / D converter 14 is controlled and the A / D converter 14 has sufficient time to control, the A / D converter 14 is controlled based on the channel activation signal sent from the asynchronous register 30. Disclose.

Patent Document 2 effectively reduces the processing load for controlling an A / D converter in a control device that performs A / D conversion of a specific analog signal with at least two kinds of timings by one A / D converter. In order to do this, the common rail pressure signal is converted into an A / D converter at two types of timings: a first timing which is a start timing of energization to the injector and a second timing for each predetermined crank angle including BTDC 60 ° CA. The A / D conversion value obtained by A / D conversion at the first timing is used for the first control processing, and the A / D conversion value obtained by A / D conversion at the second timing is used as the first A / D conversion value. When the two timings are detected to approach within the predetermined time T1, the A / D conversion is stopped at the second timing of the low priority and the first timing is detected. The A / D conversion value obtained by the A / D conversion at the first timing at that time is used as the A / D conversion value of the second A / D conversion in the second control process. A configuration to be diverted is disclosed.

Japanese Patent No. 3538867 Japanese Patent No. 4032837

However, according to the study of the present inventor, in the configuration disclosed in Patent Document 1, when there is a time margin in the control of the A / D converter 14, it is sent from the asynchronous register 30 other than the time synchronous register 32. Since the A / D converter 14 is controlled based on the channel activation signal, the control of the A / D converter 14 is complicated, and there is a time margin in the control of the A / D converter 14. If not, it is considered that not all necessary A / D conversion values can be obtained accurately.

Further, in the configuration disclosed in Patent Document 2, when A / D conversion is performed on a specific analog signal at two types of timing, if both timings approach each other, the A at the second timing of the low priority is used. / D conversion is stopped, only A / D conversion at the first timing is performed, and the A / D conversion value by the A / D conversion at the first timing is used. It is considered that not all A / D conversion values can be obtained accurately.

That is, according to the study of the present inventor, after digital signals are obtained by sequentially converting analog signals input from a plurality of input channels corresponding to a plurality of sensors into digital signals, the digital signal data is used. When controlling various electric parts of a vehicle, the A / D converter performs a simple A / D conversion process and obtains all of the latest digital signal data necessary for controlling the electric parts with high accuracy. There is a demand for a control device having a new configuration that can be used.

In particular, when adopting an electric circuit configuration that requires a certain amount of time for the voltage of the analog signal input to the A / D converter to rise, a simple A / D conversion process is performed in the A / D converter. In addition, there is a strong demand for realizing a controller having a new configuration capable of accurately obtaining all the latest digital signal data necessary for controlling electrical components.

The present invention has been made through the above-described studies, and allows the A / D converter to perform simple A / D conversion processing and accurately obtain all the latest digital signal data necessary for controlling the electrical components. It is an object to provide a control device that can be obtained.

In order to achieve the above object, according to the first aspect of the present invention, in the first aspect, an analog signal output from each of a plurality of sensors that detect a physical quantity related to control of an electrical component to be controlled is converted into a digital signal. A microcomputer that obtains digital signal data and controls the operation of the electrical component based on the digital signal data, a plurality of electrical wirings that connect the plurality of sensors and the microcomputer correspondingly, and A voltage level of the analog signal input to the microcomputer is adjusted within a predetermined range by using a plurality of CR circuits arranged corresponding to the electric wiring and a diode built in the microcomputer. And a protection circuit, wherein the microcomputer is output from the plurality of sensors. The analog signal is input correspondingly, and an A / D converter that converts the input analog signal into a digital signal to obtain digital signal data; and the digital signal that is read out and read out A control unit that controls the operation of the electrical component using signal data, and the control unit controls the operation of the electrical component among the plurality of sensors with respect to the A / D converter. In order to obtain only digital signal data required in the processing by A / D converting only the analog signal from the sensor required in the processing to be executed by the control unit, it is necessary in the processing. Only the digital signal is read out.

According to the present invention, in addition to the first aspect, the CR circuit supplements a function of the protection circuit to adjust a voltage level of the analog signal input to the microcomputer within a predetermined range. The second aspect.

In addition to the first or second aspect, the present invention provides the control unit that is output from the plurality of sensors to the A / D converter in the process to be executed by the control unit. A / D conversion is performed only on an analog signal that changes constantly among analog signals, thereby obtaining digital signal data corresponding to the analog signal that changes constantly, and reading out the necessary digital signal data. A third aspect is assumed.

Further, in addition to the first to third aspects, the present invention provides a process for the control unit to execute the control unit with respect to the A / D converter every predetermined control cycle. Digital signal data corresponding to all of the analog signals output from the plurality of sensors are obtained by sequentially A / D converting all of the analog signals output from the plurality of sensors, Reading the necessary items is a fourth aspect.

According to the present invention, in addition to any one of the first to fourth aspects, the plurality of CR circuits are arranged in the same integrated circuit, and the integrated circuit and the microcomputer are in the same package. The arrangement is the fifth aspect.

The present invention also provides digital signal data obtained by converting analog signals output from a plurality of sensors that detect physical quantities related to control of a fuel injection device to be controlled into digital signals via an A / D converter. And a control device comprising a microcomputer for controlling the operation of the fuel injection device based on the digital signal data, the microcomputer controlling the fuel injection amount for the fuel injection device. First analog signal data obtained by converting only an analog signal that is required for calculation of the fuel injection amount and that constantly changes among the analog signals output from the plurality of sensors into a digital signal by the A / D converter. And A / D conversion of all analog signals output from the plurality of sensors at predetermined control periods. The second aspect is to obtain second digital signal data by converting into a digital signal, and to calculate the fuel injection amount based on the first digital signal data and the second digital signal data; To do.

According to the control device of the first aspect of the present invention, the process that the control unit should perform to control the operation of the electrical component among the plurality of sensors with respect to the A / D converter. A / D conversion is performed only on the analog signal from the sensor required in the process, so that only the digital signal data required in the process is obtained and only the digital signal required in the process is read out. It is possible to make the A / D converter perform a simple A / D conversion process and obtain all the latest digital signal data necessary for controlling the electrical components with high accuracy.

According to the control device of the second aspect of the present invention, the CR circuit is supplemented with a function that the protection circuit adjusts the voltage level of the analog signal input to the microcomputer within a predetermined range, whereby a separate clamp diode is provided. The voltage level of the analog signal input to the microcomputer can be kept within a predetermined range without externally attaching an A / D converter even when the voltage level of the analog signal is unnecessarily high. Thus, it is possible to perform reliable A / D conversion processing and to obtain all the latest digital signal data necessary for controlling the electrical components with high accuracy.

According to the control device of the third aspect of the present invention, the control unit performs A / D conversion on only an analog signal that constantly changes among the analog signals output from the plurality of sensors with respect to the A / D converter. By acquiring the digital signal data corresponding to the constantly changing analog signal and reading out the necessary digital signal data, it is possible to reliably acquire the latest digital signal data. The operation can be controlled with high accuracy.

According to the control apparatus of the fourth aspect of the present invention, the control unit sequentially converts all analog signals output from the plurality of sensors to the A / D converter for each predetermined control cycle. By converting it, digital signal data corresponding to all analog signals output from a plurality of sensors is obtained, and by reading out necessary digital signal data, there is a possibility that it may be necessary in subsequent processing. It is possible to comprehensively prepare certain digital signal data, and to read out desired digital signals having a small fluctuation width with time, and to easily perform subsequent processing that requires such digital signal data. It can be done reliably.

According to the control device of the fifth aspect of the present invention, the plurality of CR circuits are arranged in the same integrated circuit, and the integrated circuit and the microcomputer are arranged in the same package. The entire configuration can be made compact.

According to the control device of the sixth aspect of the present invention, the microcomputer is required for calculating the fuel injection amount for controlling the fuel injection amount for the fuel injection device, and is output from the plurality of sensors. Of the signals, only the constantly changing analog signal is converted into a digital signal by the A / D converter to obtain the first digital signal data, and all the analog signals output from the plurality of sensors are obtained at predetermined control cycles. The second digital signal data is obtained by converting into a digital signal by the A / D converter, and the fuel injection amount is calculated based on the first digital signal data and the second digital signal data. In calculating the fuel injection amount and correcting the fuel injection amount, the A / D converter performs a simple A / D conversion process and reads the latest state of the constantly changing sensor. Succoth is possible, finally to obtain the proper fuel injection amount, the control of fuel injection of the fuel injection device can be performed with high accuracy.

It is a circuit diagram which shows the structure of the control apparatus in embodiment of this invention. It is a typical conceptual diagram which shows the A / D conversion process as a comparative example of the control apparatus in this embodiment. It is a typical conceptual diagram which shows the A / D conversion process of the control apparatus in this embodiment. It is sectional drawing which shows the structure by which ECU which is a microcomputer in this embodiment, CR circuit, etc. were arrange | positioned and laminated | stacked in the same package.

Hereinafter, a control device according to an embodiment of the present invention will be described in detail with reference to the drawings as appropriate.

First, the overall configuration of the control device in the present embodiment will be described in detail with reference to FIG.

FIG. 1 is a circuit diagram showing a configuration of a control device in the present embodiment.

A control device 1 shown in FIG. 1 is typically a control device capable of controlling a fuel injection operation to an internal combustion engine of a vehicle (not shown). The control device 1 corresponds to an ECU (Electronic Control Unit) 10 that is a microcomputer, a voltage clamp circuit 20, and electric wirings L1 to L8 that electrically connect the EUC 10 and the sensors SR1 to SR8 in a corresponding manner. And CR circuits 31 to 38 disposed in a row.

Each of the sensors SR1 to SR8 is typically a sensor for detecting a physical quantity related to the control of the operation state of various electrical components that define the operation state of the internal combustion engine, and outputs the detection value as an analog signal. Examples of the sensors SR1 to SR8 include a crank angle sensor, a throttle opening sensor, a pressure sensor such as an intake / exhaust pipe, an exhaust gas oxygen concentration sensor, a temperature sensor such as a coolant, and the like regarding an internal combustion engine of a vehicle. . In addition, the sensors SR1 to SR8 may receive a detection current in a configuration in which the power supply voltage Vcc is connected to the corresponding electric wirings L1 to L8 via predetermined resistance elements according to their types. For the sake of convenience, FIG. 1 shows that the power supply voltage Vcc is connected to all the sensors SR1 to SR8.

Here, the ECU 10 includes an A / D converter 11, a control unit 12, and clamp diodes D1 to D8.

The A / D converter 11 has input ports P1 to P8 corresponding to the input sensors SR1 to SR8 and result storage registries RG1 to RG8 corresponding to the input ports P1 to P8, and includes the input ports P1 to P8 and the result storage registry RG1. .. Corresponding to RG8 correspond to input channels of the A / D converter 11, respectively. Corresponding to these input ports P1 to P8, sensors SR1 to SR8 are connected via electric wirings L1 to L8. The A / D converter 11 has a function of converting the analog signals input from the sensors SR1 to SR8 into digital signals, and the digital signals after A / D conversion are digital signals corresponding to the input channels. It is stored as data in the result storage registries RG1 to RG8.

The control unit 12 includes an arithmetic processing device such as a CPU (not shown) and necessary memory elements, and controls the operation of the entire control device 1. The control unit 12 reads and acquires the digital signal data after A / D conversion from the result storage registries RG1 to RG8 of the A / D converter 11, and performs predetermined arithmetic processing based on the acquired digital signal data. The operation of the corresponding electrical component is controlled based on the result of the arithmetic processing, and as a result, the fuel injection operation of the internal combustion engine is controlled to control the combustion state of the internal combustion engine.

The clamp diodes D1 to D8 are built in the ECU 10. The clamp diodes D1 to D8 are connected to the A / D converter 11 while being provided in front of the input ports P1 to P8 corresponding to the input ports P1 to P8 of the A / D converter 11, and a common power source. They are connected in series in the forward direction toward the voltage Vcc.

The voltage clamp circuit 20 is input to the input ports P1 to P8 using the power supply voltage Vcc and the clamp diodes D1 to D8 connected between the input ports P1 to P8 of the A / D converter 11. A function to limit the voltage level of the analog signal so as not to exceed a predetermined range, together with the clamp diodes D1 to D8, a protection circuit against excessive input voltage to the ECU 10, particularly to the A / D converter 11 Functions as a protection circuit against excessive voltage input. Since the clamp diodes D1 to D8 are inherently built in the ECU 10, the number of parts of the control device 1 is reduced as compared with the case where a diode externally attached to the ECU 10 is used as the clamp diode. The configuration can be simplified and the cost of the control device 1 can be reduced.

Further, the CR circuits 31 to 38 are respectively arranged corresponding to the electric wirings L1 to L8 that electrically connect the EUC 10 and the sensors SR1 to SR8 correspondingly. And capacitor C. The CR circuits 31 to 38 are provided in consideration of insufficient withstand voltages of the clamp diodes D1 to D8 built in the ECU 10, and are composed of the voltage clamp circuit 20 and the clamp diodes D1 to D8. Complementing the protection function for the ECU 10 of the protection circuit, when an excessive voltage is input to the input ports P1 to P8 of the A / D converter 11 in the ECU 10, a part of the excessive voltage is resisted immediately before that. It has a function of absorbing by the element R and the capacitor C. Note that the resistance element R and the capacitor C may be the same, or may have different characteristics depending on the types of the sensors SR1 to SR8.

That is, from the viewpoint of complementing the protection function of the protection circuit composed of the voltage clamp circuit 20 and the clamp diodes D1 to D8, the resistance value of the resistance element R of the CR circuits 31 to 38 and the capacitance of the capacitor C are A / It is desirable that the input ports P1 to P8 of the D converter 11 and the A / D converter 11 itself be sufficiently large so that they can be reliably protected.

However, if the resistance value of the resistance element R1 or the capacitance of the capacitor C is too large, the voltage signal input to the A / D converter 11 does not rise rapidly, and the input ports P1 to P8 of the A / D converter 11 A voltage signal that is input to any one and A / D-converted may be affected by a voltage signal that is input to an adjacent input port and A / D-converted. It is also possible to decrease the Accordingly, the resistance value of the resistance element R and the capacitance of the capacitor C are determined by the crosstalk (dynamic fluctuation) and linearity (static fluctuation) of the A / D conversion, the A / D converter 11 and the like. The noise toughness (breakage prevention) is set comprehensively.

Next, the A / D conversion processing in the control device 1 having the above configuration will be described in detail with reference to FIGS.

FIG. 2 is a schematic conceptual diagram showing an A / D conversion process as a comparative example of the control device in the present embodiment, and the horizontal axis shows time. FIG. 3 is a schematic conceptual diagram showing A / D conversion processing of the control device in the present embodiment, and the horizontal axis shows time.

First, the A / D conversion process of the comparative example will be described with reference to FIG.

As shown in FIG. 2, in the A / D conversion process in the comparative example, the control unit 12 sequentially repeats all of the analog signals input to the input ports P1 to P8 with respect to the A / D converter 11. A digital signal is obtained by / D conversion and is stored in the result storage registries RG1 to RG8, and the digital signal data AD0 to AD7 stored in the result storage registries RG1 to RG8 in this way are processed by processes A and B. Regardless of A and C, the data is always continuously scanned, read and acquired (continuous full scan mode).

The processing A, B, and C will be described in detail. First, the processing A includes a reference position necessary for controlling the internal combustion engine, for example, information on which combustion stroke position the internal combustion engine is in. In order to acquire, it is a process with a high task level activated in response to a crank pulse every 30 degrees of the crank angle. Next, the process B is a process with a high task level that is started in response to a crank pulse every 360 degrees of the crank angle in order to calculate a control amount for controlling the internal combustion engine, for example, a fuel injection amount. In the relationship between the respective task levels in the processing A and the processing B, the processing A is prioritized over the processing B. The process C is a process having a lower priority than the processes A and B and a task level that is sufficient if the process C is started in a predetermined cycle. For example, in the control of the internal combustion engine, the temperature state of the internal combustion engine is acquired. It is processing to do. The crank pulse is transmitted from a crank angle sensor (not shown).

Here, since the control device 1 is provided with CR circuits 31 to 38 corresponding to the electric wirings L1 to L8 that electrically connect the EUC 10 and the sensors SR1 to SR8, their resistance values and static values are reduced. Due to the capacitance, it takes some time for the signal voltage of the analog signals input to the input ports P1 to P8 to rise, and the A / D converter 11 performs all A / D conversions corresponding to a predetermined number of bits. It can be considered that it takes a certain amount of time to complete all the digital signal data.

For example, in the internal combustion engine, in the process A using the digital signal data AD1 and the digital signal data AD4 respectively corresponding to the input port P2 corresponding to the throttle opening sensor SR2 and the input port P5 corresponding to the negative pressure sensor SR5 of the intake pipe. If the A / D conversion process is in the continuous full scan mode, the control unit 12 activates the process A and uses the digital signal data AD1 and the digital signal data AD4. There are cases where the digital signal data AD1 and the digital signal data AD4 from the previous cycle must be used as in the process A of the second time. This situation is the same in the subsequent process B for calculating the fuel injection amount and the process C for calculating the state of the internal combustion engine.

This means that the control unit 12 may not be able to appropriately control the operation of the electrical component or the like to be controlled based on the latest state of the internal combustion engine. In particular, when A / D conversion is performed on the detection value of the throttle opening sensor SR2 having a large fluctuation range or the detection value of the negative pressure sensor SR5 of the intake pipe depending on the state of the internal combustion engine, a coolant temperature sensor having a small fluctuation range in a normal state. Compared to the case where the detection value of SR4 is A / D converted, the acquired digital signal data tends to change greatly depending on the acquisition timing. Therefore, the control unit 12 uses, for example, the latest digital signal data. A situation where the fuel injection amount cannot be calculated is also assumed, and the calculated fuel injection amount does not substantially make sense, and it may be difficult to control the fuel injection operation with high accuracy.

Therefore, in the control device 1 according to the present embodiment, the control unit 12 causes the A / D converter 11 to execute A / D conversion processing as described below, and then reads and acquires the digital signal data. It is a thing.

Specifically, as shown in FIG. 3, in the A / D conversion process of the present embodiment, for example, for an internal combustion engine, it corresponds to the input port P2 corresponding to the throttle opening sensor SR2 and the negative pressure sensor SR5 of the intake pipe. When executing the processing A that obtains and uses the digital signal data AD1 and digital signal data AD4 respectively corresponding to the input port P5 to be performed, the control unit 12 sets the input port P2 to the A / D converter 11. A / D conversion is controlled only for the input analog signal and the analog signal input to the input port P5, and the A / D converter 11 correspondingly receives the analog signal input to the input port P2. A / D conversion is performed only on the analog signal input to the input port P5, and the digital signal data corresponding to the input port P2 and the input port P5 is converted. AD1 and generates only the digital signal data AD4, stores each result storage registry RG2 and RG5.

At this time, in the processing A, the A / D conversion processing is performed only on the analog signal input to the input port P2 and the analog signal input to the input port P5. The processing time can be set so as to give necessary and sufficient A / D conversion time, and the digital signal data AD1 and digital signal data AD4 in the latest state in which all of them are completely assembled are stored in the result storage registries RG1 and RG8. After being stored in, it can be used as appropriate.

Also, as shown in FIG. 3, in the A / D conversion process of the present embodiment, for example, digital signal data AD2 obtained corresponding to the input port P3 corresponding to the exhaust gas oxygen concentration sensor SR3 is obtained and used. When executing the process B, the control unit 12 controls the A / D converter 11 to perform digital conversion only on the analog signal input from the input port P3, and the A / D converter 11 correspondingly performs A / D conversion only on the analog signal input from the input port P3, generates only the digital signal data AD2 corresponding to the input port P3, and stores it in the result storage registry RG3. .

At this time, in the process B, since the A / D conversion process is performed only on the analog signal input to the input port P3, a necessary and sufficient A / D conversion time is required for the A / D converter 11. The processing time can be set so that the digital signal data AD2 in the latest state, all of which are completely complete, is stored in the result storage registry RG3 and can be used as appropriate.

Furthermore, as shown in FIG. 3, in the A / D conversion process of the present embodiment, the control unit 12 receives the signals from all the input ports P1 to P8 at a predetermined timing such as a 10 millisecond period at an appropriate timing. A job (10 ms JOB) for performing A / D conversion processing on an analog signal is executed. Specifically, the control unit 12 controls the A / D converter 11 to A / D convert all analog signals input to the input ports P1 to P8 into digital signals, thereby performing A / D conversion. Correspondingly, the unit 11 performs digital conversion on all analog signals input to the input ports P1 to P8 to generate digital signal data AD0 to AD7, and stores them in the result storage registries RG1 to RG8. The 10 ms JOB is a job for performing A / D conversion processing on analog signals from all the input ports P1 to P8 in a short time such as a 10 millisecond period, so that all the digital signal data AD0 to AD7 are prepared. Although not limited, acquiring digital signal data that can be used even if A / D conversion processing is completed in a short time or not all is significant has the significance of performing such a short time job.

As shown in FIG. 3, in the A / D conversion process of the present embodiment, the control unit 12 stores, for example, in the result storage registry RG4 corresponding to the detected value of the coolant temperature sensor SR4 having a small fluctuation range in a normal state. The stored digital signal data AD3 and the like are read and acquired, and processing C for calculating the temperature state of the internal combustion engine is executed. Since the process C uses the digital signal data AD3 corresponding to the detected value of the coolant temperature sensor SR4 having a small fluctuation range in the normal state, the process C is not the latest data and can be obtained with 10 ms JOB executed in a short time. Even if such digital signal data AD3 or the like is used, it can be said that the influence on the processing accuracy is small.

After that, the control unit 12 that has executed the process C repeats various processes such as the process A, the process B, the 10 ms JOB, and the process C as appropriate.

Next, the case where the control unit 12 executes a fuel injection amount calculation process for calculating the fuel injection amount as a process in the process B will be described in more detail as an example.

Specifically, the control unit 12 uses an A / D converter to convert a digital signal that constantly changes at the time of calculation from among a plurality of analog signals output from a plurality of sensors required for calculating the fuel injection amount. Of the first digital signal data obtained by conversion into analog signals and the analog signals output from a plurality of sensors, an analog signal with a small fluctuation range is normally converted into a digital signal by an A / D converter at the time of calculation. Based on the second digital signal data obtained in this way, calculation of the fuel injection amount is started at the timing of process B. At least one kind of digital signal data included in the first digital signal data is acquired in the process B.

More specifically, as shown in FIG. 3, when the control unit 12 executes the fuel injection amount calculation process at the timing of the process B, the crank angle is already set immediately before the process B at the timing when the process B is started. By processing A that is started in response to a crank pulse every 30 degrees or the like, both the detection value that fluctuates in the throttle opening sensor SR2 and the detection value that fluctuates in the negative pressure sensor SR5 of the intake pipe are both in the latest state In the process B that is started when a certain digital signal data AD1 and digital signal data AD4 are already stored in the storage registries RG1 and RG8 and is activated by receiving a crank pulse at every 360 degrees of the crank angle, the oxygen concentration of the exhaust gas The latest digital signal data AD2 corresponding to the detection value fluctuating by the sensor SR3 is stored in the result storage registry R. It is intended to be stored in 3. Therefore, the control unit 12 can use the latest digital signal data AD1, AD2, and AD4 obtained in this manner as the first digital signal data. First, the basic fuel in the calculation of the fuel injection amount is obtained. The injection amount is calculated. When the process B has time allowance, the process B itself performs A / D conversion on the detected value of the throttle opening sensor SR2 and the detected value of the negative pressure sensor SR5 of the intake pipe, The digital signal data AD1 and the digital signal data AD4 may be obtained and used.

In the process B, in order to accurately calculate the fuel injection amount, it is desirable to calculate the final fuel injection amount by correcting the basic fuel injection amount thus obtained. The correction of the basic fuel injection amount uses the temperature state of the internal combustion engine. For example, the digital signal of the coolant temperature sensor SR4, which is necessary for calculating the temperature state of the internal combustion engine and normally has a small fluctuation range. The data AD3 is already stored in the storage registry RG4 by 10 ms JOB before the process B. Therefore, the control unit 12 corrects the basic fuel injection amount using the digital signal data AD3 obtained by 10 ms JOB as the second digital signal data, and uses the corrected value as the final fuel injection amount. Will be calculated. If there is no time margin for the process B, the temperature state of the internal combustion engine already obtained in the process C before the process B may be used.

In the above configuration, the mounting configuration of the ECU 10, the voltage clamp circuit 20, and the CR circuits 31 to 38 will be described in detail with reference to FIG.

FIG. 4 is a cross-sectional view showing a configuration in which an ECU, which is a microcomputer in the present embodiment, and a CR circuit are arranged and stacked in the same package.

As shown in FIG. 4, the voltage clamp circuit 20 and the CR circuits 31 to 38 are integrated, and the integrated circuit and the ECU 10 are sealed and integrated in a package PK such as the same housing. It has a configuration and is mounted on a desired support SB and fixed to a vehicle or the like. Such a package PK is, for example, a resin sealing body, and is molded by a transfer molding method or the like. According to such a configuration, the configuration of the control device 1 can be made compact. Of course, if necessary, only the CR circuits 31 to 38 may be integrated, and the integrated circuit and the ECU 10 may be sealed and integrated in a package PK such as the same housing.

In the above configuration, of course, when the A / D converter 11 completes all A / D conversions corresponding to a predetermined number of bits and it takes time to collect all the digital signal data, the CR circuit is of course used. However, the present invention is not limited to the one provided with 31 to 38, and other circuit configurations or the like may be adopted to generate an event in the same manner.

According to the above configuration, the control unit from the sensors required for the process to be executed by the control unit to control the operation of the electrical component among the plurality of sensors with respect to the A / D converter. By only A / D converting only the analog signal of A, it is possible to obtain only the digital signal data required in the processing, and to read out only the digital signal required in the processing, thereby making the A / D converter simple. All the latest digital signal data necessary for controlling the electrical components can be obtained with high accuracy while performing the A / D conversion process.

In addition, the CR circuit complements the function that the protection circuit adjusts the voltage level of the analog signal input to the microcomputer within a predetermined range, so that it can be input to the microcomputer without attaching a separate clamp diode or the like. The analog signal voltage level can be kept within a predetermined range, and even when the analog signal voltage level is unnecessarily high, the A / D converter performs a reliable A / D conversion process, and All the latest digital signal data necessary for controlling the electrical components can be obtained with high accuracy.

Further, the control unit A / D converts only analog signals that change constantly among the analog signals output from the plurality of sensors to the A / D converter, thereby corresponding to the analog signals that change constantly. By obtaining the digital signal data and reading out necessary ones of the digital signal data, the latest digital signal data can be surely acquired, and thus the operation of the electrical component can be controlled with high accuracy.

In addition, the control unit sequentially outputs all the analog signals output from the plurality of sensors to the A / D converter for each predetermined control cycle, thereby outputting the signals from the plurality of sensors. By obtaining digital signal data corresponding to all analog signals and reading out necessary digital signal data, comprehensively prepare digital signal data that may be required in subsequent processing. Therefore, it is possible to read out desired digital signal data having a small fluctuation width with time, and to easily and reliably perform subsequent processing that requires such digital signal data.

Further, since the plurality of CR circuits are arranged in the same integrated circuit, and the integrated circuit and the microcomputer are arranged in the same package, the configuration of the entire control device can be made compact.

Further, among the analog signals output from a plurality of sensors that are necessary for calculation of the fuel injection amount for the microcomputer to control the fuel injection amount for the fuel injection device, only the analog signal that changes constantly is output as A. The first digital signal data is obtained by converting it into a digital signal by the / D converter, and all the analog signals output from the plurality of sensors are converted into digital signals by the A / D converter every predetermined control period. The second digital signal data is obtained and the fuel injection amount is calculated based on the first digital signal data and the second digital signal data. The A / D converter can be made to perform simple A / D conversion processing, and the latest state of the constantly changing sensor can be read out. And Do give fuel injection amount, the control of fuel injection of the fuel injection device can be performed with high accuracy.

In the present invention, the type, arrangement, number, and the like of the members are not limited to the above-described embodiments, and the components depart from the gist of the invention, such as appropriately replacing the constituent elements with those having the same operational effects. Of course, it can be appropriately changed within the range not to be.

As described above, in the present invention, there is provided a control device that allows the A / D converter to perform simple A / D conversion processing and accurately obtain all the digital signal data necessary for controlling the electrical components. It can be provided, and is expected to be widely applicable to control devices for electric parts such as vehicles because of its universal universal character.

Claims

An analog signal output from each of a plurality of sensors that detect a physical quantity related to control of an electrical component that is a control target is converted into a digital signal to obtain digital signal data, and based on the digital signal data, the electrical component A microcomputer for controlling the operation;
A plurality of electrical wirings correspondingly connecting the plurality of sensors and the microcomputer;
A plurality of CR circuits arranged corresponding to the plurality of electrical wirings;
A protection circuit for adjusting a voltage level of the analog signal input to the microcomputer using a diode built in the microcomputer within a predetermined range;
A control device comprising:
The microcomputer receives the analog signals output from the plurality of sensors, converts the input analog signals into digital signals to obtain digital signal data, and the digital signals A controller that reads data and controls the operation of the electrical component using the read digital signal data;
The control unit is configured to perform analog processing on the A / D converter from sensors required in processing to be executed by the control unit in order to control the operation of the electrical component among the plurality of sensors. A control device characterized in that only digital signal data required in the processing is obtained by A / D conversion of only the signal, and only the digital signal required in the processing is read out.
2. The control device according to claim 1, wherein the CR circuit complements a function of the protection circuit to adjust a voltage level of the analog signal input to the microcomputer within a predetermined range.
In the process to be executed by the control unit, the control unit causes the A / D converter to A / D convert only an analog signal that constantly changes among the analog signals output from the plurality of sensors. 2. The control apparatus according to claim 1, wherein digital signal data corresponding to the constantly changing analog signal is obtained, and necessary ones of the digital signal data are read out.
In the processing to be executed by the control unit, the control unit sequentially converts all analog signals output from the plurality of sensors to the A / D converter for each predetermined control cycle. 2. The control according to claim 1, wherein digital signal data corresponding to all of the analog signals output from the plurality of sensors is obtained, and necessary ones of the digital signal data are read out. apparatus.
The control device according to claim 1, wherein the plurality of CR circuits are arranged in the same integrated circuit, and the integrated circuit and the microcomputer are arranged in the same package.
An analog signal output from each of a plurality of sensors that detect physical quantities related to control of the fuel injection device that is a control target is converted into a digital signal via an A / D converter to obtain digital signal data, and A control device comprising a microcomputer for controlling the operation of the fuel injection device based on digital signal data,
The microcomputer is required only in the calculation of the fuel injection amount for controlling the fuel injection amount for the fuel injection device, and among the analog signals output from the plurality of sensors, only the analog signal that constantly changes. Is converted into a digital signal by the A / D converter to obtain first digital signal data, and all the analog signals output from the plurality of sensors are converted by the A / D converter every predetermined control period. A control device characterized in that a second digital signal data is obtained by conversion into a digital signal, and the fuel injection amount is calculated based on the first digital signal data and the second digital signal data.