US20030220726A1 - Vehicle electronic controller - Google Patents
Vehicle electronic controller Download PDFInfo
- Publication number
- US20030220726A1 US20030220726A1 US10/442,172 US44217203A US2003220726A1 US 20030220726 A1 US20030220726 A1 US 20030220726A1 US 44217203 A US44217203 A US 44217203A US 2003220726 A1 US2003220726 A1 US 2003220726A1
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- Prior art keywords
- monitoring
- determination values
- values
- normal
- control microcomputer
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- 238000012544 monitoring process Methods 0.000 claims abstract description 99
- 238000000034 method Methods 0.000 claims description 20
- 230000004044 response Effects 0.000 claims description 4
- 230000000295 complement effect Effects 0.000 claims 4
- 238000002347 injection Methods 0.000 description 10
- 239000007924 injection Substances 0.000 description 10
- 230000006870 function Effects 0.000 description 7
- 238000001514 detection method Methods 0.000 description 6
- 239000000446 fuel Substances 0.000 description 5
- 230000005856 abnormality Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000994 depressogenic effect Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B23/00—Testing or monitoring of control systems or parts thereof
- G05B23/02—Electric testing or monitoring
- G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
- G05B23/0218—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterised by the fault detection method dealing with either existing or incipient faults
- G05B23/0224—Process history based detection method, e.g. whereby history implies the availability of large amounts of data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D11/00—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated
- F02D11/06—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance
- F02D11/10—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type
- F02D11/105—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type characterised by the function converting demand to actuation, e.g. a map indicating relations between an accelerator pedal position and throttle valve opening or target engine torque
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/005—Testing of electric installations on transport means
- G01R31/006—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks
- G01R31/007—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks using microprocessors or computers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/282—Testing of electronic circuits specially adapted for particular applications not provided for elsewhere
- G01R31/2829—Testing of circuits in sensor or actuator systems
Definitions
- the present invention relates to a vehicle electronic controller, and more particularly, to a technique for checking for abnormality of a control microcomputer, which controls an actuator installed in a vehicle.
- Electronic throttles are installed in some recent vehicles to electrically measure the amount an accelerating has been depressed and control the degree of opening of a throttle valve in accordance with the depressed amount of the pedal.
- a vehicle employing the electronic throttle includes an actuator for driving a throttle valve. Therefore, when the vehicle is provided with a constant velocity driving function, by adding a few input devices and making system software changes, the constant velocity driving function is achieved without adding a throttle valve drive actuator exclusively for constant velocity driving.
- Japanese Laid-Open Patent Publication Number 6-307274 proposes separating the microcomputer, which controls the throttle valve opening degree, into a main microcomputer and a sub-microcomputer for safety when adding the constant velocity driving function to the electronic throttle.
- the sub-microcomputer which has the same functions as the main microcomputer, retrieves calculation results from the main microcomputer (e.g., throttle valve opening degree) and compares the results with results that are calculated by the sub-microcomputer. If the compared results do not match, the sub-microcomputer determines that the main microcomputer is not functioning normally and stops electronic control of the throttle.
- the sub-microcomputer uses a determination value that is stored in a ROM of the sub microcomputer to check control data of the main microcomputer. Since the determination value differs between vehicles, a different sub microcomputer must be produced for each vehicle. This increases costs of the vehicle electronic controller.
- the present invention provides an electronic controller for a vehicle having an actuator.
- the electronic controller includes a control microcomputer for calculating control data to control the actuator in the vehicle in accordance with a driving condition of the vehicle, and a monitoring IC connected to the control microcomputer to check whether the control data is normal using a determination value, wherein the control microcomputer sends the determination value to the monitoring IC, and the monitoring IC includes a memory device for storing the determination value in a rewritable manner.
- a further aspect of the present invention is an electronic controller for a vehicle having an actuator.
- the electronic controller includes a control microcomputer for calculating control data to control the actuator in the vehicle in accordance with a driving condition of the vehicle, a monitoring IC connected to the control microcomputer to check whether or not the control data is normal based on a determination value, and a rewritable non-volatile memory connected to the monitoring IC.
- the control microcomputer sends the determination value to the monitoring IC, and the monitoring IC receives the determination value and stores the determination value in the non-volatile memory.
- a further aspect of the present invention is a method for checking an electronic controller for a vehicle.
- the electronic controller includes a control microcomputer, which calculates control data to control an actuator installed in the vehicle in accordance with a driving condition of the vehicle, and a monitoring IC, which is connected to the control microcomputer.
- the method includes storing a determination value in the control microcomputer to check whether the control data is normal, sending the determination value to the monitoring IC from the control microcomputer and checking the control data with the monitoring IC using the determination value.
- FIG. 1 is a schematic diagram of a vehicle electronic controller according to one embodiment of the present invention.
- FIG. 2 is a flow chart showing a procedure for setting a determination value of a monitoring IC with respect to an S-RAM
- FIG. 3 is a schematic diagram of a vehicle electronic controller according to further embodiment of the present invention.
- the present invention is embodied in a vehicle electronic controller (hereinafter, referred to as a vehicle ECU 10 ) that controls the driving condition of a vehicle.
- vehicle ECU 10 functions to control a throttle valve.
- FIG. 1 is a schematic diagram of the vehicle ECU 10 .
- the vehicle ECU 10 includes a control microcomputer 11 and a monitoring IC (“integrated circuit”) 12 , which checks the control microcomputer 11 .
- the control microcomputer 11 is configured by a known logical operation circuit, which includes a CPU, a ROM, and a RAM, and has an electronic throttle controller 13 and an EFI (“electronic fuel injection”) controller 14 .
- the monitoring IC 12 includes a monitoring section 15 and a standby RAM (hereinafter, referred to as an S-RAM) 16 .
- the S-RAM 16 is a memory device that stores a rewritable determination value, which is provided from the control microcomputer 11 , to detect an abnormality in control data.
- the monitoring section 15 may be a CPU or a logical circuit.
- the control microcomputer 11 has a control function and a communication function, which include electronic throttle control and fuel injection control.
- the ROM (not shown) of the control microcomputer 11 stores programs for performing the electronic throttle control and the fuel injection control. Further, the ROM of the control microcomputer 11 prestores determination values used to check an abnormality in control data of an electronic throttle motor 17 and an abnormality in control data of a fuel injection valve 18 .
- the electronic throttle controller 13 receives detection signals of an accelerator opening degree sensor 20 , an engine rotation speed sensor 21 , and a vehicle velocity sensor 22 and calculates the present throttle opening degree.
- the electronic throttle controller 13 generates throttle control data in accordance with the calculated throttle opening degree and provides the throttle control data to the electronic throttle motor 17 to control the opening degree of the electronic throttle.
- the control microcomputer 11 generates injection valve control data in correspondence with the present throttle opening degree in accordance with the detection signals from the accelerator opening degree sensor 20 and the vehicle velocity sensor 22 , and controls the injection valve 18 in accordance with the injection valve control data.
- the detection signals from the accelerator opening degree sensor 20 , the engine rotation speed sensor 21 , and the vehicle velocity sensor 22 are provided to the monitoring IC 12 through the communication between the control microcomputer 11 and the monitoring IC 12 .
- the checking determination values and either the mirror values or sum of the determination values are simultaneously sent to the monitoring IC 12 from the control microcomputer 11 .
- the mirror values are complements of the checking determination values and the sum is the total of the determination values.
- the monitoring IC 12 uses the mirror values or the sum to determine whether or not the received checking determination values are normal. If the checking determination values are normal, the checking determination values are stored in the S-RAM 16 .
- the monitoring IC 12 requests the control microcomputer 11 to resend the checking determination values and either the mirror values or the sum of the checking determination values.
- the monitoring IC 12 determines whether or not the checking determination values resent from the control microcomputer 11 are normal using the resent mirror values or the sum. If the determination values are normal, the resent checking determination values are stored in the S-RAM 16 .
- the monitoring IC 12 uses a plurality of predetermined provisional determination values, which are stored in the S-RAM 16 , as the checking determination values.
- the monitoring IC 12 receives the detection signal from the accelerator opening degree sensor 20 , the engine rotation speed sensor 21 , and the vehicle velocity sensor 22 and calculates a determination value corresponding to the present throttle opening degree from the determination values stored in the S-RAM 16 and a determination value for the injection valve control data of the injection valve 18 .
- the monitoring IC 12 retrieves the detection signal of the throttle opening degree sensor, which detects the opening degree of an electronic throttle (not shown), and compares the detection value with determination value data stored in the S-RAM 16 to check whether the control data of the control microcomputer 11 is normal.
- the monitoring IC 12 retrieves control data, which is provided from the EFI controller 14 to the fuel injection valve 18 , and compares the control data with the determination values stored in the S-RAM 16 to check whether or not the control data of the control microcomputer 11 is normal.
- FIG. 2 A procedure for setting the determination values of the S-RAM 16 in the monitoring IC 12 will now be described with reference to a flow chart in FIG. 2.
- the series of processes shown in FIG. 2 is executed by the control microcomputer 11 and the monitoring IC 12 each time the vehicle engine is started, that is, each time an ignition switch is turned on.
- the control microcomputer 11 determines whether or not the connection of the battery BT is the initial connection, that is, whether or not the vehicle has just been manufactured (step S 110 ). If the connecting of the battery BT is determined not to be the initial connection (NO in step S 110 ), the control microcomputer 11 ends the process.
- step S 110 If the connection of the battery BT is determined to be the initial connection (YES in step S 110 ), the control microcomputer 11 simultaneously sends the checking determination values and either the mirror values or sum of the checking determination values to the monitoring IC 12 (step S 120 ).
- the monitoring IC 12 determines whether or not the received determination values are normal using the mirror values or the sum (step S 130 ). If the determination values are determined to be normal (YES in step S 130 ), the monitoring IC 12 stores the determination values as the determination values for control data of the control microcomputer 11 in the S-RAM 16 (step S 140 ) and ends the process.
- the monitoring IC 12 requests the control microcomputer 11 to resend the checking determination values and either the mirror values or the sum of the determination values (step S 150 )
- the control microcomputer 11 simultaneously resends the checking determination values and either the mirror values or the sum of the checking determination values in response to the request from the monitoring IC 12 (step S 160 ).
- the monitoring IC 12 determines whether or not the checking determination values, which are resent from the control microcomputer 11 , are normal using the resent mirror values or the sum (step 170 ). If the resent determination values are determined to be normal (YES in step 170 ), the monitoring IC 12 stores the resent determination values in the S-RAM 16 (step 140 ) and ends the process.
- the monitoring IC 12 uses the predetermined provisional determination values stored in the S-RAM 16 as the determination values (step S 180 ) and completes the process.
- the vehicle electronic controller 10 of the present embodiment has the advantages described below.
- the control microcomputer 11 of the controller 10 sends the checking determination values to the monitoring IC 12 , and the monitoring IC 12 stores the checking determination values in the S-RAM 16 .
- the same monitoring IC 12 may be used in different vehicles. This reduces the cost of the vehicle ECU 10 .
- the control microcomputer 11 sends the checking determination values to the monitoring IC 12 only when the battery BT is initially connected and the ignition switch SW is turned on. Therefore, there is a high possibility of the control microcomputer 11 being normal, and the checking determination values are highly reliable.
- the control microcomputer 11 simultaneously sends the checking determination values and either the mirror values or sum of the checking determination values to the monitoring IC 12 . Therefore, the monitoring IC 12 easily determines whether or hot the checking determination values are normal based on the mirror values or the sum.
- the control microcomputer 11 requests the checking determination values and either the mirror values or sum of the checking determination values to be resent.
- the monitoring IC 12 receives the determination values and either the mirror values or sum of the determination values again.
- the monitoring IC 12 prestores the provisional checking determination values to check the control data of the control microcomputer 11 .
- the monitoring IC 12 employs the provisional checking determination values when determining that the determination values that are received from the control microcomputer 11 for a second time are abnormal from either the mirror values or sum of the monitoring determination values that are received from the control microcomputer 11 for a second time. Accordingly, even if the checking determination values that are received again from the control microcomputer 11 are not normal, the control data of the control microcomputer 11 may be checked with the provisional determination values.
- An electrically erasable programmable (EE-P) ROM 31 which is a non-volatile memory and connected to the monitoring IC 12 , may be used in lieu of the S-RAM 16 of the monitoring IC 12 , as shown in FIG. 3. In this case, since data of the EE-PROM 31 is not lost, a backup power electric source is not required and a commercially available EE-PROM 31 may be used to reduce the manufacturing cost of the monitoring IC 12 .
- the monitoring IC 12 may store the checking determination values and either the mirror values or sum of the checking determination values in the S-RAM 16 without determining whether or not the received checking determination values are normal. In this case, the monitoring IC 12 determines whether or not the checking determination values are normal based on either the mirror values or the sum of the checking determination values just before checking the control data of the control microcomputer 11 .
- the monitoring IC 12 may employ the predetermined provisional determination values stored in the S-RAM 16 as the checking determination values without requiring the control microcomputer 11 to resend the checking determination values and either the mirror values or sum of the checking determination values when the checking determination values are initially determined not to be normal.
- the monitoring IC 12 may request the control microcomputer 11 to resend the checking determination values and either the mirror values or sum of checking determination values for a number of times.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Testing And Monitoring For Control Systems (AREA)
- Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
Abstract
A vehicle electronic controller for checking a control microcomputer with a common monitoring IC, which is used in different vehicles. The vehicle electronic controller includes a control microcomputer, which calculates control data to control an actuator installed in a vehicle in accordance with a driving condition of the vehicle, and a monitoring IC, which is connected to the control microcomputer and checks whether or not the control data is normal based on a determination value. The control microcomputer provides the determination value to the monitoring IC. The monitoring IC includes a memory device, which stores the determination value in a rewritable manner. The monitoring IC receives the determination value and stores the determination value in the memory device.
Description
- The present invention relates to a vehicle electronic controller, and more particularly, to a technique for checking for abnormality of a control microcomputer, which controls an actuator installed in a vehicle.
- Electronic throttles are installed in some recent vehicles to electrically measure the amount an accelerating has been depressed and control the degree of opening of a throttle valve in accordance with the depressed amount of the pedal. A vehicle employing the electronic throttle includes an actuator for driving a throttle valve. Therefore, when the vehicle is provided with a constant velocity driving function, by adding a few input devices and making system software changes, the constant velocity driving function is achieved without adding a throttle valve drive actuator exclusively for constant velocity driving.
- Japanese Laid-Open Patent Publication Number 6-307274 proposes separating the microcomputer, which controls the throttle valve opening degree, into a main microcomputer and a sub-microcomputer for safety when adding the constant velocity driving function to the electronic throttle. In a vehicle electronic controller described in the publication, the sub-microcomputer, which has the same functions as the main microcomputer, retrieves calculation results from the main microcomputer (e.g., throttle valve opening degree) and compares the results with results that are calculated by the sub-microcomputer. If the compared results do not match, the sub-microcomputer determines that the main microcomputer is not functioning normally and stops electronic control of the throttle.
- However, in the vehicle electronic controller of the publication, the sub-microcomputer uses a determination value that is stored in a ROM of the sub microcomputer to check control data of the main microcomputer. Since the determination value differs between vehicles, a different sub microcomputer must be produced for each vehicle. This increases costs of the vehicle electronic controller.
- It is an object of the present invention to provide a vehicle electronic controller that uses the same monitoring IC (“integrated circuit”), which checks a control microcomputer regardless of the type of vehicle to reduce costs.
- To achieve the above object, the present invention provides an electronic controller for a vehicle having an actuator. The electronic controller includes a control microcomputer for calculating control data to control the actuator in the vehicle in accordance with a driving condition of the vehicle, and a monitoring IC connected to the control microcomputer to check whether the control data is normal using a determination value, wherein the control microcomputer sends the determination value to the monitoring IC, and the monitoring IC includes a memory device for storing the determination value in a rewritable manner.
- A further aspect of the present invention is an electronic controller for a vehicle having an actuator. The electronic controller includes a control microcomputer for calculating control data to control the actuator in the vehicle in accordance with a driving condition of the vehicle, a monitoring IC connected to the control microcomputer to check whether or not the control data is normal based on a determination value, and a rewritable non-volatile memory connected to the monitoring IC. The control microcomputer sends the determination value to the monitoring IC, and the monitoring IC receives the determination value and stores the determination value in the non-volatile memory.
- A further aspect of the present invention is a method for checking an electronic controller for a vehicle. The electronic controller includes a control microcomputer, which calculates control data to control an actuator installed in the vehicle in accordance with a driving condition of the vehicle, and a monitoring IC, which is connected to the control microcomputer. The method includes storing a determination value in the control microcomputer to check whether the control data is normal, sending the determination value to the monitoring IC from the control microcomputer and checking the control data with the monitoring IC using the determination value.
- Other aspects and advantages of the invention will become apparent from the following description, taken in conjunction with the accompanying drawings, illustrating by way of example the principles of the invention.
- The invention, together with objects and advantages thereof, may best be understood by reference to the following description of the presently preferred embodiments together with the accompanying drawings in which:
- FIG. 1 is a schematic diagram of a vehicle electronic controller according to one embodiment of the present invention;
- FIG. 2 is a flow chart showing a procedure for setting a determination value of a monitoring IC with respect to an S-RAM; and
- FIG. 3 is a schematic diagram of a vehicle electronic controller according to further embodiment of the present invention.
- In the invention, like reference numerals are used for like elements throughout.
- A preferred embodiment according to the present invention will now be described with reference to FIGS. 1 and 2. In the preferred embodiment, the present invention is embodied in a vehicle electronic controller (hereinafter, referred to as a vehicle ECU10) that controls the driving condition of a vehicle. The
vehicle ECU 10 functions to control a throttle valve. - FIG. 1 is a schematic diagram of the
vehicle ECU 10. Referring to FIG. 1, the vehicle ECU 10 includes acontrol microcomputer 11 and a monitoring IC (“integrated circuit”) 12, which checks thecontrol microcomputer 11. Thecontrol microcomputer 11 is configured by a known logical operation circuit, which includes a CPU, a ROM, and a RAM, and has anelectronic throttle controller 13 and an EFI (“electronic fuel injection”)controller 14. - The
monitoring IC 12 includes amonitoring section 15 and a standby RAM (hereinafter, referred to as an S-RAM) 16. The S-RAM 16 is a memory device that stores a rewritable determination value, which is provided from thecontrol microcomputer 11, to detect an abnormality in control data. Themonitoring section 15 may be a CPU or a logical circuit. - The
control microcomputer 11 has a control function and a communication function, which include electronic throttle control and fuel injection control. The ROM (not shown) of thecontrol microcomputer 11 stores programs for performing the electronic throttle control and the fuel injection control. Further, the ROM of thecontrol microcomputer 11 prestores determination values used to check an abnormality in control data of anelectronic throttle motor 17 and an abnormality in control data of afuel injection valve 18. - The
electronic throttle controller 13 receives detection signals of an acceleratoropening degree sensor 20, an enginerotation speed sensor 21, and avehicle velocity sensor 22 and calculates the present throttle opening degree. Theelectronic throttle controller 13 generates throttle control data in accordance with the calculated throttle opening degree and provides the throttle control data to theelectronic throttle motor 17 to control the opening degree of the electronic throttle. - The
control microcomputer 11 generates injection valve control data in correspondence with the present throttle opening degree in accordance with the detection signals from the acceleratoropening degree sensor 20 and thevehicle velocity sensor 22, and controls theinjection valve 18 in accordance with the injection valve control data. The detection signals from the acceleratoropening degree sensor 20, the enginerotation speed sensor 21, and thevehicle velocity sensor 22 are provided to themonitoring IC 12 through the communication between thecontrol microcomputer 11 and themonitoring IC 12. - When a battery BT is initially connected to various electric components of the vehicle and an ignition switch SW is turned on, the checking determination values and either the mirror values or sum of the determination values are simultaneously sent to the
monitoring IC 12 from thecontrol microcomputer 11. In the preferred embodiment, the mirror values are complements of the checking determination values and the sum is the total of the determination values. Themonitoring IC 12 uses the mirror values or the sum to determine whether or not the received checking determination values are normal. If the checking determination values are normal, the checking determination values are stored in the S-RAM 16. - If the plurality of checking determination values are not normal, the
monitoring IC 12 requests thecontrol microcomputer 11 to resend the checking determination values and either the mirror values or the sum of the checking determination values. Themonitoring IC 12 determines whether or not the checking determination values resent from thecontrol microcomputer 11 are normal using the resent mirror values or the sum. If the determination values are normal, the resent checking determination values are stored in the S-RAM 16. - If the resent checking determination values are not normal, the
monitoring IC 12 uses a plurality of predetermined provisional determination values, which are stored in the S-RAM 16, as the checking determination values. - The
monitoring IC 12 receives the detection signal from the acceleratoropening degree sensor 20, the enginerotation speed sensor 21, and thevehicle velocity sensor 22 and calculates a determination value corresponding to the present throttle opening degree from the determination values stored in the S-RAM 16 and a determination value for the injection valve control data of theinjection valve 18. Themonitoring IC 12 retrieves the detection signal of the throttle opening degree sensor, which detects the opening degree of an electronic throttle (not shown), and compares the detection value with determination value data stored in the S-RAM 16 to check whether the control data of thecontrol microcomputer 11 is normal. Themonitoring IC 12 retrieves control data, which is provided from theEFI controller 14 to thefuel injection valve 18, and compares the control data with the determination values stored in the S-RAM 16 to check whether or not the control data of thecontrol microcomputer 11 is normal. - A procedure for setting the determination values of the S-
RAM 16 in themonitoring IC 12 will now be described with reference to a flow chart in FIG. 2. The series of processes shown in FIG. 2 is executed by thecontrol microcomputer 11 and themonitoring IC 12 each time the vehicle engine is started, that is, each time an ignition switch is turned on. - First, the
control microcomputer 11 determines whether or not the connection of the battery BT is the initial connection, that is, whether or not the vehicle has just been manufactured (step S110). If the connecting of the battery BT is determined not to be the initial connection (NO in step S110), thecontrol microcomputer 11 ends the process. - If the connection of the battery BT is determined to be the initial connection (YES in step S110), the
control microcomputer 11 simultaneously sends the checking determination values and either the mirror values or sum of the checking determination values to the monitoring IC 12 (step S120). - The
monitoring IC 12 determines whether or not the received determination values are normal using the mirror values or the sum (step S130). If the determination values are determined to be normal (YES in step S130), themonitoring IC 12 stores the determination values as the determination values for control data of thecontrol microcomputer 11 in the S-RAM 16 (step S140) and ends the process. - If the values are determined not to be normal (NO in step S130), the
monitoring IC 12 requests thecontrol microcomputer 11 to resend the checking determination values and either the mirror values or the sum of the determination values (step S150) Thecontrol microcomputer 11 simultaneously resends the checking determination values and either the mirror values or the sum of the checking determination values in response to the request from the monitoring IC 12 (step S160). - The
monitoring IC 12 determines whether or not the checking determination values, which are resent from thecontrol microcomputer 11, are normal using the resent mirror values or the sum (step 170). If the resent determination values are determined to be normal (YES in step 170), the monitoringIC 12 stores the resent determination values in the S-RAM 16 (step 140) and ends the process. - If the resent determination values are determined not to be normal (NO in step S170), the monitoring
IC 12 uses the predetermined provisional determination values stored in the S-RAM 16 as the determination values (step S180) and completes the process. - The vehicle
electronic controller 10 of the present embodiment has the advantages described below. - The
control microcomputer 11 of thecontroller 10 sends the checking determination values to themonitoring IC 12, and themonitoring IC 12 stores the checking determination values in the S-RAM 16. Thus, thesame monitoring IC 12 may be used in different vehicles. This reduces the cost of thevehicle ECU 10. - The
control microcomputer 11 sends the checking determination values to themonitoring IC 12 only when the battery BT is initially connected and the ignition switch SW is turned on. Therefore, there is a high possibility of thecontrol microcomputer 11 being normal, and the checking determination values are highly reliable. - The
control microcomputer 11 simultaneously sends the checking determination values and either the mirror values or sum of the checking determination values to themonitoring IC 12. Therefore, the monitoringIC 12 easily determines whether or hot the checking determination values are normal based on the mirror values or the sum. - If the
monitoring IC 12 determines that the checking determination values are determined not to be normal using the mirror values or sum of the checking determination values, thecontrol microcomputer 11 requests the checking determination values and either the mirror values or sum of the checking determination values to be resent. Thus, the monitoringIC 12 receives the determination values and either the mirror values or sum of the determination values again. - The
monitoring IC 12 prestores the provisional checking determination values to check the control data of thecontrol microcomputer 11. Themonitoring IC 12 employs the provisional checking determination values when determining that the determination values that are received from thecontrol microcomputer 11 for a second time are abnormal from either the mirror values or sum of the monitoring determination values that are received from thecontrol microcomputer 11 for a second time. Accordingly, even if the checking determination values that are received again from thecontrol microcomputer 11 are not normal, the control data of thecontrol microcomputer 11 may be checked with the provisional determination values. - It should be apparent to those skilled in the art that the present invention may be embodied in many other specific forms without departing from the spirit or scope of the invention. Particularly, it should be understood that the present invention may be embodied in the following forms.
- An electrically erasable programmable (EE-P)
ROM 31, which is a non-volatile memory and connected to themonitoring IC 12, may be used in lieu of the S-RAM 16 of themonitoring IC 12, as shown in FIG. 3. In this case, since data of the EE-PROM 31 is not lost, a backup power electric source is not required and a commercially available EE-PROM 31 may be used to reduce the manufacturing cost of themonitoring IC 12. - The
monitoring IC 12 may store the checking determination values and either the mirror values or sum of the checking determination values in the S-RAM 16 without determining whether or not the received checking determination values are normal. In this case, the monitoringIC 12 determines whether or not the checking determination values are normal based on either the mirror values or the sum of the checking determination values just before checking the control data of thecontrol microcomputer 11. - The
monitoring IC 12 may employ the predetermined provisional determination values stored in the S-RAM 16 as the checking determination values without requiring thecontrol microcomputer 11 to resend the checking determination values and either the mirror values or sum of the checking determination values when the checking determination values are initially determined not to be normal. - The
monitoring IC 12 may request thecontrol microcomputer 11 to resend the checking determination values and either the mirror values or sum of checking determination values for a number of times. - The present examples and embodiments are to be considered as illustrative and not restrictive, and the invention is not to be limited to the details given herein, but may be modified within the scope and equivalence of the appended claims.
Claims (20)
1. An electronic controller for a vehicle having an actuator, the electronic controller comprising:
a control microcomputer for calculating control data to control the actuator in the vehicle in accordance with a driving condition of the vehicle; and
a monitoring IC connected to the control microcomputer to check whether the control data is normal using a determination value, wherein the control microcomputer sends the determination value to the monitoring IC, and the monitoring IC includes a memory device for storing the determination value in a rewritable manner.
2. The electronic controller according to claim 1 , wherein the control microcomputer has a plurality of determination values, calculates a plurality of mirror values, each of which is complement of a corresponding one of the determination values, calculates a sum of the plurality of determination values, and simultaneously sends either the mirror values or the sum to the monitoring IC together with the determination values.
3. The electronic controller according to claim 2 , wherein the monitoring IC determines whether or not the determination values are normal with either the mirror values or the sum and requests the control microcomputer to resend the determination values and either the mirror values or the sum when the determination values are determined not to be normal.
4. The electronic controller according to claim 3 , wherein the monitoring IC stores the determination values in the memory device when the plurality of determination values are determined to be normal.
5. The electronic controller according to claim 3 , wherein the control microcomputer simultaneously resends the plurality of determination values and either the plurality of mirror values or the sum to the monitoring IC in response to the request, the monitoring IC prestores a provisional determination value to check whether the control data is normal, and the monitoring IC determines whether the resent determination values are normal using either the mirror values or the sum and employs the provisional determination value when the resent determination values are determined not to be normal.
6. The electronic controller according to claim 5 , wherein the monitoring IC stores the resent determination values in the memory device when the resent determination values are determined to be normal.
7. The electronic controller according to claim 2 , wherein the monitoring IC prestores a provisional determination value to check whether the control data is normal, and the monitoring IC determines whether the determination values are normal using either the mirror values or the sum and employs the provisional determination value when the determination values are determined not to be normal.
8. The electronic controller according to claim 1 , wherein the vehicle includes an ignition-switch, a battery, and electric components and the control microcomputer sends the determination values to the monitoring IC when the battery is initially connected to at least one electric component of the vehicle and the ignition switch is turned on.
9. The electronic controller according to claim 1 , wherein the actuator is a throttle valve motor, and the control microcomputer is a throttle control microcomputer controlling the throttle valve motor.
10. An electronic controller for a vehicle having an actuator, the electronic controller comprising:
a control microcomputer for calculating control data to control the actuator in the vehicle in accordance with a driving condition of the vehicle;
a monitoring IC connected to the control microcomputer to check whether or not the control data is normal based on a determination value; and
a rewritable non-volatile memory connected to the monitoring IC, wherein the control microcomputer sends the determination value to the monitoring IC, and the monitoring IC receives the determination value and stores the determination value in the non-volatile memory.
11. The electronic controller according to claim 10 , wherein the control microcomputer has a plurality of determination values and calculates a plurality of mirror values, each of which is complement of a corresponding one of the determination values, calculates the sum of the determination values, and simultaneously sends either the mirror values or the sum to the monitoring IC together with the determination values, the monitoring IC determines whether the determination values are normal with either the mirror values or the sum and requests the control microcomputer to resend the determination values and either the mirror values or the sum when the determination values are determined not to be normal, and the monitoring IC stores the determination values in the non-volatile memory when the determination values are determined to be normal.
12. The electronic controller according to claim 11 , wherein the control microcomputer simultaneously resends the determination values and either the mirror values or the sum to the monitoring IC in response to the request, the monitoring IC prestores a provisional determination value to check whether the control data is normal, the monitoring IC determining whether the resent determination values are normal with either the resent mirror values or the resent sum and employs the resent provisional determination value when the resent determination values are determined not to be normal, and the monitoring IC storing the resent determination values in the non-volatile memory when the resent determination values are determined to be normal.
13. The electronic controller according to claim 11 , wherein the vehicle includes an ignition switch, a battery, and electric components and the control microcomputer sends the determination values to the monitoring IC when the battery is initially connected to at least one electric component of the vehicle and the ignition switch is turned on.
14. The electronic controller according to claim 11 , wherein the actuator is a throttle valve motor, and the control microcomputer is a throttle control microcomputer for controlling the throttle valve motor.
15. A method for checking an electronic controller for a vehicle, the electronic controller including a control microcomputer, which calculates control data to control an actuator installed in the vehicle in accordance with a driving condition of the vehicle, and a monitoring IC, which is connected to the control microcomputer, the method comprising:
storing a determination value in the control microcomputer to check whether the control data is normal;
sending the determination value to the monitoring IC from the control microcomputer; and
checking the control data with the monitoring IC using the determination value.
16. The method according to claim 15 , wherein the control microcomputer includes a plurality of determination values and the monitoring IC includes a memory device for storing the determination values in a rewritable manner, the method further comprising:
calculating a plurality of mirror values, each of which is complement of a corresponding one of the determination values, and calculating a sum of the determination values;
simultaneously sending either the mirror values or the sum to the monitoring IC together with the determination values;
determining whether the determination values are normal with the monitoring IC using either the mirror values or the sum;
requesting the control microcomputer to resend the determination values and either the plurality of mirror values or the sum from the monitoring IC when the determination values are determined not to be normal; and
storing the plurality of determination values in the memory device when the determination values are determined to be normal.
17. The method according to claim 16 , wherein the monitoring IC prestores a provisional determination value to check whether the control data is normal, the method further comprising:
simultaneously resending the determination values and either the mirror values or the sum to the monitoring IC from the control microcomputer in response to the request;
determining whether the resent determination values are normal with the monitoring IC using either the resent mirror values or the resent sum;
checking whether the control data is normal using the provisional determination value when the resent determination values are determined not to be normal; and
storing the resent determination values in the memory device when the resent determination values are determined to be normal.
18. The method according to claim 15 , wherein the vehicle includes an ignition switch, a battery, and electric components and said sending determination value includes sending the determination values to the monitoring IC when the battery is initially connected to at least one electric component in the vehicle and the ignition switch is activated.
19. The method according to claim 15 , wherein the actuator is a throttle valve motor, and said checking includes sending control data to control the throttle valve motor.
20. The method according to claim 15 , wherein the vehicle electronic controller includes a non-volatile memory, which is connected to the monitoring IC and rewritable, the method further comprising:
calculating a plurality of mirror values, each of which is a complement of a corresponding one of the determination values, and calculating a sum of the determination values;
simultaneously sending either the mirror values or the sum to the monitoring IC together with the determination values;
determining whether or not the determination values are normal with the monitoring IC using either the mirror values or the sum;
requesting the control microcomputer to resend the determination values and either the mirror values or the sum from the monitoring IC when the determination value is determined as not being normal; and
storing the determination values in the non-volatile memory when the determination values are determined to be normal.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/956,066 US7020550B2 (en) | 2002-05-22 | 2004-10-04 | Vehicle electronic controller |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2002-147711 | 2002-05-22 | ||
JP2002147711A JP3818218B2 (en) | 2002-05-22 | 2002-05-22 | Electronic control device for vehicle |
Related Child Applications (1)
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US10/956,066 Continuation US7020550B2 (en) | 2002-05-22 | 2004-10-04 | Vehicle electronic controller |
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US20030220726A1 true US20030220726A1 (en) | 2003-11-27 |
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US10/442,172 Abandoned US20030220726A1 (en) | 2002-05-22 | 2003-05-21 | Vehicle electronic controller |
US10/956,066 Expired - Lifetime US7020550B2 (en) | 2002-05-22 | 2004-10-04 | Vehicle electronic controller |
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US10/956,066 Expired - Lifetime US7020550B2 (en) | 2002-05-22 | 2004-10-04 | Vehicle electronic controller |
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JP (1) | JP3818218B2 (en) |
DE (1) | DE10322978B4 (en) |
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JP4353126B2 (en) * | 2005-04-08 | 2009-10-28 | トヨタ自動車株式会社 | Vehicle state determination device |
JP4453764B2 (en) * | 2008-02-22 | 2010-04-21 | トヨタ自動車株式会社 | Vehicle diagnostic device, vehicle diagnostic system, and diagnostic method |
JP5365551B2 (en) * | 2010-03-05 | 2013-12-11 | トヨタ自動車株式会社 | Internal combustion engine control device |
US9278746B1 (en) * | 2013-03-15 | 2016-03-08 | Brunswick Corporation | Systems and methods for redundant drive-by-wire control of marine engines |
CN110751873B (en) * | 2019-11-15 | 2021-10-26 | 郑州意昂新能源汽车科技有限公司 | Method for interconnecting whole vehicle electric control practical training platform of new energy automobile and actual vehicle |
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US4049957A (en) * | 1971-06-23 | 1977-09-20 | Hitachi, Ltd. | Dual computer system |
DE4114999C2 (en) * | 1991-05-08 | 2001-04-26 | Bosch Gmbh Robert | System for controlling a motor vehicle |
JPH06286503A (en) | 1993-04-05 | 1994-10-11 | Fujitsu Ten Ltd | Fail safe device of constant speed running device |
JPH06307274A (en) * | 1993-04-21 | 1994-11-01 | Fujitsu Ten Ltd | Abnormal condition monitoring device |
US5666544A (en) * | 1993-05-10 | 1997-09-09 | Mita Industrial Co., Ltd. | Method and system for communicating data between independent controllers |
US5405110A (en) * | 1993-10-08 | 1995-04-11 | Wisconsin Alumni Research Foundation | Catheter holding apparatus |
US5845489A (en) * | 1995-11-08 | 1998-12-08 | Denso Corporation | Abnormality detector for air-fuel ratio control system |
JP3991384B2 (en) * | 1996-07-15 | 2007-10-17 | 株式会社デンソー | Electronic control unit |
JP3449170B2 (en) * | 1996-08-09 | 2003-09-22 | トヨタ自動車株式会社 | Misfire detection device for internal combustion engine |
DE19640432C2 (en) * | 1996-09-30 | 2002-09-26 | Siemens Ag | Method for monitoring an internal combustion engine |
US6144887A (en) | 1996-12-09 | 2000-11-07 | Denso Corporation | Electronic control unit with reset blocking during loading |
DE19653429C2 (en) * | 1996-12-20 | 1998-10-15 | Siemens Ag | Method for checking the functionality of a computing unit |
US6285931B1 (en) | 1998-02-05 | 2001-09-04 | Denso Corporation | Vehicle information communication system and method capable of communicating with external management station |
JP3314749B2 (en) * | 1999-02-17 | 2002-08-12 | 株式会社デンソー | Electronic control unit |
JP4008197B2 (en) | 2000-01-14 | 2007-11-14 | 株式会社デンソー | VEHICLE CONTROL DEVICE AND RECORDING MEDIUM HAVING DIAGNOSIS FUNCTION |
TW544559B (en) | 2000-09-19 | 2003-08-01 | Mitsubishi Motors Corp | Failure diagnosis apparatus and failure diagnosis method of vehicular electronic control system |
JP3925062B2 (en) * | 2000-09-19 | 2007-06-06 | 三菱電機株式会社 | In-vehicle electronic control unit |
JP3721089B2 (en) * | 2001-03-01 | 2005-11-30 | 株式会社日立製作所 | Vehicle diagnostic system and automobile using the system |
US6748308B2 (en) * | 2001-03-30 | 2004-06-08 | Siemens Vdo Automotive Corporation | Automated closure system and method |
JP3883842B2 (en) | 2001-11-02 | 2007-02-21 | 株式会社デンソー | Electronic control device for vehicle |
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US20050049768A1 (en) | 2005-03-03 |
DE10322978A1 (en) | 2004-01-08 |
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US7020550B2 (en) | 2006-03-28 |
JP3818218B2 (en) | 2006-09-06 |
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