JP6148838B2 - Vehicle electronic control unit and data adjustment system thereof - Google Patents

Description

  The present invention relates to an electronic control device for a vehicle and a data adjustment system thereof.

  An engine of a vehicle is equipped with an electronic control unit (ECU), and electrical components such as fuel injection valves and spark plugs are controlled using the electronic control unit. The electronic control unit has a flash ROM (Read Only Memory), and data such as parameters and programs for controlling electrical components is stored in the flash ROM. The parameters used by the electronic control unit are determined according to the type of engine and the like, and values adjusted at the vehicle design stage are used.

  Here, when adjusting the parameters for controlling the electrical components, ROM emulation is performed with the engine running, and the data in the flash ROM is rewritten. Conventionally, a RAM (Random Access Memory) capable of emulating ROM data is separately provided in the electronic control unit, and adjustment work is performed in a state where all data such as parameters stored in the flash ROM are expanded in the RAM. . Then, according to the adjustment result, the parameters of the RAM are adjusted from an external controller, and finally, the adjusted parameters are overwritten in the flash ROM (see, for example, Patent Document 1).

JP 9-44373 A

However, conventionally, since all the data stored in the flash ROM needs to be expanded in the RAM, a large-capacity RAM is required, which increases the cost of the electronic control unit. On the other hand, if a small-capacity RAM is used, the data in the flash ROM cannot be fully developed, so that the rewriting operation becomes difficult. In particular, when the vehicle is a motorcycle, it is necessary to reduce the capacity of the RAM because it is necessary to reduce the size and cost of the electronic control unit as compared to a four-wheeled vehicle.
The present invention has been made in view of such circumstances, and an object of the present invention is to ensure that data rewriting processing of an electronic control unit of a vehicle can be reliably performed even with a small-capacity RAM.

According to the present invention, in the electronic control unit that acquires the control value stored in the nonvolatile memory in accordance with the driving state of the vehicle and controls the electrical component, the adjustment data used to adjust the control value is obtained. By multiplying the volatile memory that can be temporarily stored and rewritten each time new adjustment data is input, and the adjustment data held in the volatile memory when the control value is adjusted , , the non-volatile by adjusting the control value obtained from the memory Outputs, after completing the adjustment of the control value, reflects the adjustment data used at the adjustment end newly stored in the nonvolatile memory the control value, to output a control value output unit that outputs the acquired according to driving conditions of the vehicle, a signal for driving the electrical component by using the control value output from the control value output unit An electronic control unit of the vehicle, characterized in that it comprises a electrical component control unit, is provided.
In addition, the control value output unit may be configured such that, after the adjustment of the control value is completed, the nonvolatile memory from the adjustment device capable of rewriting data in the nonvolatile memory and the volatile memory while being connected to the electronic control unit. 2. The vehicle electronic control unit according to claim 1, wherein the control value newly stored in the vehicle is acquired and output according to the driving situation of the vehicle.
Furthermore, the said vehicle is a motorcycle, The electronic control unit of the vehicle of Claim 1 or Claim 2 characterized by the above-mentioned is provided.
The vehicle electrical control unit according to any one of claims 1 to 3, wherein the electrical component is an electrical component of an engine of the vehicle.

Further, according to another aspect of the present invention, the electronic control unit for a vehicle according to any one of claims 1 to 4, connectable to the electronic control unit, with the non-volatile memory volatilization An adjustment device capable of rewriting data in the volatile memory, wherein the adjustment device is the same value as the control value stored in the nonvolatile memory and an ideal value of the control value when adjusting the control value. A vehicle having an adjustment amount calculation unit that calculates the adjustment data from a reference value acquired according to a driving situation of the vehicle, and transmits the adjustment data to the volatile memory. A data adjustment system for an electronic control unit is provided.

Further, according to another aspect of the present invention, the adjusting device has a storage unit for storing the previous SL control value adjusted by the adjustment data as the update data, the control value of the tone Seitsui After the completion the data adjusting system for electronic control unit for a vehicle according to claim 5, characterized by being configured the update data in the storage unit to be sent to the non-volatile memory is provided.

  According to the present invention, it is possible to write the adjustment data in the volatile memory and adjust the control value using the adjustment data. Since the control value can be adjusted with a small amount of data, the capacity of the volatile memory can be reduced.

FIG. 1 is a block diagram showing a schematic configuration of a data adjustment system according to an embodiment of the present invention. FIG. 2 is a flowchart for explaining processing of the data adjustment system according to the embodiment of the present invention. FIG. 3 is a diagram for explaining the four-point interpolation method used in the embodiment of the present invention.

The form for implementing this invention is demonstrated in detail below.
The data adjustment system 1 includes an electronic control unit 2 of a vehicle and an adjustment device 3 that can be connected to the electronic control unit 2.
The electronic control unit 2 includes an A / D (Analog / digital) converter 11, a CPU (Central Processing Unit) 12, a RAM 13, a flash ROM 14, and a drive circuit 15.

  Analog signals from the crank angle sensor 21, the throttle opening sensor 22, and the air-fuel ratio sensor 23 are input to the A / D converter 11, and each is converted into a digital signal. The crank angle sensor 21 detects the rotation of a crankshaft of an engine (not shown) and outputs a crank angle signal. The throttle opening sensor 22 outputs a signal indicating the opening of the throttle valve (throttle opening Th) attached to the intake pipe of the engine. The air-fuel ratio sensor 23 is attached to the exhaust pipe of the engine and outputs, for example, a detection result (information on the air-fuel ratio λ) of the amount of oxygen contained in the exhaust gas.

  The CPU 12 receives the crank angle converted into a digital signal by the A / D converter 11, information on the throttle opening degree Th, and the air-fuel ratio λ. The CPU 12 is functionally divided into a control value output unit 31 and an electrical component control unit 32 as functions characteristic of this embodiment. Further, the control value output unit 31 includes a data reflection unit 33. The CPU 12 can output data to the monitor 41 of the adjusting device 3 and can output a command signal to the drive circuit 15. In addition, data used for processing by the CPU 12 can be transferred between the RAM 13 and the flash ROM 14.

The control value output unit 31 calculates a control value for controlling the electrical component based on the information on the crank angle, the throttle opening Th, the air-fuel ratio λ, and the data in the RAM 13 and the flash ROM 14, and the electrical component control unit 32. It is configured to output to. In this embodiment, since the device to be controlled is the fuel injection valve 25, the control value is the fuel injection amount.
The data reflecting unit 33 executes a process of adjusting the control data of the flash ROM 14 using the data written from the adjusting device 3 to the RAM 13. Furthermore, it is responsible for the process of reflecting data transmitted from the adjustment device 3 on the flash ROM 14 after completion of the adjustment work described later.
The electrical component control unit 32 is configured to calculate a command signal for driving the electrical component drive circuit 15 from the control value and to control the drive circuit 15.

The drive circuit 15 has a circuit configuration for driving an electrical component to be controlled, for example, the fuel injection valve 25. The control target may be other than the fuel injection valve 25 such as an ignition device or a throttle valve. Further, the number of objects to be controlled is not limited to one and may be plural.
The RAM 13 has a capacity capable of temporarily storing a small amount of data transmitted from the adjustment device 3. For this reason, the capacity of the RAM 13 is sufficiently smaller than the capacity of the flash ROM 14. Instead of providing the RAM 13 separately from the CPU 12, a small-capacity volatile memory provided in the CPU 12 can be used as the RAM 13.
The flash ROM 14 stores programs and parameters used by the CPU 12. In this embodiment, the flash ROM 14 stores a first map corresponding to the fuel injection valve 25, for example, a current fuel injection amount map 35. Data stored in the flash ROM 14 can be written from the adjustment device 3.

  Here, the adjustment device 3 functions as a recording unit 42, a reference fuel injection amount acquisition unit 43, a monitor 41, an input device 44, a ratio calculation unit 45 that is an adjustment amount calculation unit, and a ratio multiplication unit 46. Can be divided.

The recording unit 42 has a configuration capable of temporarily recording data. In this embodiment, the recording unit 42 stores a reference fuel injection amount map 51 as a second map corresponding to the fuel injection valve 25. The reference fuel injection amount map 51 has a configuration in which the fuel injection amount is mapped so as to be searchable using the engine speed Ne and the throttle opening degree Th as parameters.
The reference fuel injection amount acquisition unit 43 searches the reference fuel injection amount map 51 of the recording unit 42 based on the engine speed Ne acquired from the electronic control unit 2 and the throttle opening degree Th, and the reference fuel injection amount b (reference value). Is configured to get.

Further, the monitor 41 can display the value of the air-fuel ratio λ input to the CPU 12 of the electronic control unit 2 of the vehicle.
The input device 44 allows the operator to input a desired fuel injection amount b0 that is an ideal fuel injection amount corresponding to the air-fuel ratio λ.
The ratio calculation unit 45 calculates the ratio R as the adjustment data. The ratio R is a ratio between the reference fuel injection amount b acquired by the reference fuel injection amount acquisition unit 43 and the desired fuel injection amount b0 input from the input device 44. Specifically, R = b0 / b. .
The ratio multiplying unit 46 multiplies the ratio R calculated by the ratio calculating unit 45 and the reference fuel injection amount b, calculates an adjustment value b ′ that is the adjusted fuel injection amount, and outputs it to the recording unit 42. .

  Next, an adjustment method by the data adjustment system 1 will be described mainly with reference to the flowchart of FIG. This process is executed in a state in which the electronic control unit 2 and the adjustment device 3 are connected so as to communicate with each other.

In step S101, the electronic control unit 2 starts the engine, and the control value output unit 31 of the CPU 12 determines the engine speed Ne based on signals from the crank angle sensor 21, the throttle opening sensor 22, and the air-fuel ratio sensor 23, respectively. The throttle opening degree Th and the air-fuel ratio λ are acquired. In subsequent step S <b> 102, the adjustment device 3 reads the engine operating state from the electronic control unit 2. Specifically, the reference fuel injection amount acquisition unit 43 acquires the engine speed Ne and the throttle opening degree Th from the CPU 12. In subsequent step S103, the reference fuel injection amount acquisition unit 43 searches the reference fuel injection amount map 51 of the recording unit 42 by the engine speed Ne and the throttle opening degree Th, and acquires the reference fuel injection amount b.

  Further, in step S104, the operator inputs the desired fuel injection amount b0 from the input device 44 with reference to the air / fuel ratio λ data displayed on the monitor 41. Subsequently, in step S105, the ratio calculation unit 45 calculates the ratio R by dividing the desired fuel injection amount b0 by the reference fuel injection amount b. The ratio R is transmitted to the electronic control unit 2 in step S106 and written in the RAM 13.

  Next, in step S107, the control amount output unit 31 of the CPU 12 searches the current fuel injection amount map 35 of the flash ROM 14 with the engine speed Ne and the throttle opening degree Th, and uses the current fuel injection amount e as a control value. To get. Subsequently, in step S108, the control value output unit 31 calculates a fuel injection amount adjustment value e ′ (first adjustment value) by multiplying the current fuel injection amount e by the ratio R written in the RAM 13. To do. In step S109, an instruction is issued to drive the fuel injection valve 25 at a predetermined timing based on the adjustment value e ′. More specifically, the electrical component control unit 32 outputs a command signal based on the adjustment value e ′ calculated by the control value output unit 31 according to the instruction, and the drive circuit 15 drives the fuel injection valve 25.

  On the other hand, in the adjustment device 3, the ratio R calculated by the ratio calculation unit 45 in step S <b> 106 is sent to the ratio multiplication unit 46. In step S110, the ratio multiplication unit 46 multiplies the ratio R by the reference fuel injection amount b to calculate the fuel injection amount adjustment value b ′ (second adjustment value). Further, in step S111, the value of the reference fuel injection amount in the reference fuel injection amount map 51 of the recording unit 42 is rewritten using the adjustment value b ′. Specifically, the reference fuel injection amount b specified by the engine speed Ne and the throttle opening degree Th is replaced with an adjustment value b ′ calculated at the same engine speed Ne and the throttle opening degree Th.

  Next, in step S112, the operator determines the end of the adjustment work. When it is determined that the adjustment work of the engine (fuel injection valve 25) has been completed through the processes so far, the operator instructs the input device 44 to end the work. Meanwhile, the operator manually stops the engine. In this case, in step S113, the electronic control unit 2 determines whether the engine stop has been completed. The determination process in step S113 is repeated until it is determined that the engine stop has been completed.

  On the other hand, if further engine adjustment work is required, the process returns from step S112 to step S101, and the above processing is repeated at predetermined time intervals until the engine adjustment work is completed. In this case, each time the ratio R is newly calculated in step S105, the data in the RAM 13 is rewritten. That is, only the latest ratio R is always stored in the RAM 13. The adjustment work may be ended by an instruction from the operator, but when the ratio R calculated by the ratio calculation unit 45 becomes 1, that is, the desired fuel injection amount b0 corresponding to the air-fuel ratio λ, It may be terminated when the reference fuel injection amount b becomes equal.

After determining that the engine stop has been completed in step S113, in step S114, the adjustment device 3 uses the adjustment value b ′ written in the reference fuel injection amount map 51 of the recording unit 42 as the update data to flash the electronic control unit 2. It transmits to ROM14. In step S115, the data reflection unit 33 of the electronic control unit 2 updates the data of the current fuel injection amount map 35 of the flash ROM 14 using the adjustment value b ′ transmitted from the adjustment device 3. Specifically, the current fuel injection amount e specified by the engine speed Ne and the throttle opening degree Th is replaced with the adjustment value b ′ calculated at the same engine speed Ne and the throttle opening degree Th. Then, the process here is terminated. In steps S114 and S115,
Instead of transmitting the adjustment value b ′, the reference fuel injection amount map 51 is transmitted as update data, and the current fuel injection amount map 35 in the flash ROM 14 is rewritten to the reference fuel injection amount map 51 by the data reflecting unit 33. good.

  Here, when the reference fuel injection amount b and the current fuel injection amount e are searched from the current fuel injection amount map 35 and the reference fuel injection amount map 51, the parameter values do not match the indexes of the maps 35 and 51. There is. For this reason, in this embodiment, the reference fuel injection amount b and the current fuel injection amount e are obtained by using a four-point interpolation method so that the fuel injection amount can be searched even when it is out of the index. As shown in FIG. 3, in the four-point interpolation method, first, it corresponds to the index values of four adjacent points so as to surround the fuel injection amount b specified by two parameters of the engine speed Ne and the throttle opening degree Th. The fuel injection amounts b1, b2, b3, b4 to be acquired are acquired. In the example of FIG. 3, the fuel injection amount at the lower left index of the target fuel injection amount b is b1, and the fuel injection amount at the lower right index is b2. Furthermore, the fuel injection amounts at the upper left and upper right indexes of the target fuel injection amount b are defined as b3 and b4.

  Subsequently, an imaginary line connecting the fuel injection amount b1 and the fuel injection amount b2 is calculated. In the example of FIG. 3, the imaginary line connecting the fuel injection amount b1 and the fuel injection amount b2 coincides with the grid lines of the maps 35 and 51. Then, fuel injection is performed on the grid line between the fuel injection amount b1 and the fuel injection amount b2 from the ratio of the engine speed Ne1, Ne2 corresponding to the fuel injection amount b1, b2 and the engine speed Ne of the target fuel injection amount b. An interpolation value b12 when the amount b is projected is obtained. Similarly, when the fuel injection amount b is projected onto the grid line between the fuel injection amount b3 and the fuel injection amount b4, the interpolation value b34 is obtained. Then, the target fuel injection amount b is obtained from the ratio between the throttle opening Th1 and Th2 of the interpolation values b12 and b34 and the throttle opening Th of the target fuel injection amount b.

  As described above, in this embodiment, in performing the adjustment work of the electrical components of the vehicle, the ratio R is calculated from the ideal value (= b0) and the actual value (= b) as the adjustment data. Then, only the ratio R is transmitted from the adjustment device 3 to the electronic control unit 2. The electronic control unit 2 manages the ratio R with the RAM 13 and controls the electrical components by adjusting the data in the flash ROM 14 with the ratio R. Further, every time the ratio R is calculated, the reference fuel injection amount map 51 is updated with the adjustment value b ′, and the reference fuel injection amount map 51 finally obtained is reflected in the flash ROM 14 using 33. did. Accordingly, the capacity of the RAM 13 used for adjustment can be greatly reduced, for example, about 1 byte. Therefore, a large-capacity RAM is not required for the electronic control unit 2, and the apparatus can be reduced in size and cost. Since the RAM 13 of the electronic control unit 2 can be reduced in capacity, the mass-produced product can be adjusted by the adjusting device 3 and shipped.

  Here, the data adjustment system 1 may include a prototype electronic control unit 2 before mass production. In this case, the current fuel injection amount map 35 adjusted by the prototype electronic control unit 2 is written in the flash ROM 14 of the mass-produced electronic control unit 2.

Note that the present invention can be widely applied without being limited to the embodiments.
For example, the flowchart of FIG. 2 shows the steps related to the adjustment operation of the fuel injection valve 25, but the adjustment operation can be performed by the same process for other electrical components. For example, when the adjustment operation of the ignition device is performed after the adjustment operation of the fuel injection valve 25, a command to start adjustment of the ignition device is input from the input device 44 of the adjustment device 3 after step S115 is completed. . The ratio calculation unit 45 transmits a signal for starting adjustment of the ignition device to the RAM 13 of the electronic control unit 2. Based on this signal, the data reflection unit 33 switches the processing of the CPU 12 to the adjustment operation of the ignition device.

Subsequently, the same processing as described above is executed from step S101. In this case, the ratio of the ignition timing is transmitted from the adjustment device 3 to the RAM 13 of the electronic control unit 2, and adjustment work is performed. After the adjustment is completed, the engine is stopped, and the data in the recording unit 42 is written into the flash ROM 14 of the electronic control unit 2.
Further, the adjustment device 3 may be for a user of the vehicle to adjust the data of the electronic control unit 2 after the vehicle is shipped.

DESCRIPTION OF SYMBOLS 1 Data adjustment system 2 Electronic control unit 3 Adjustment apparatus 12 CPU
13 RAM
14 Flash ROM
Reference Signs List 31 control value output unit 32 electrical component control unit 35 current fuel injection amount map 42 storage unit 43 reference fuel injection amount acquisition unit 45 ratio calculation unit 51 reference fuel injection amount map

Claims (6)

In the electronic control unit that acquires the control value stored in the nonvolatile memory according to the driving situation of the vehicle and controls the electrical component,
A volatile memory that can temporarily hold adjustment data used to adjust the control value and is rewritten each time new adjustment data is input ;
Wherein the time adjustment of the control value, the volatile memory by multiplying the adjustment data stored, the Outputs by adjusting the control value obtained from the non-volatile memory, the adjustment end of the control value Later, a control value output unit that acquires and outputs the control value newly stored in the nonvolatile memory reflecting the adjustment data used at the end of the adjustment , according to the driving situation of the vehicle,
An electronic control unit for a vehicle, comprising: an electrical component control unit that outputs a signal for driving the electrical component using the control value output from the control value output unit. After the adjustment of the control value is completed, the control value output unit newly transfers the data from the nonvolatile memory and the volatile memory to the nonvolatile memory while being connected to the electronic control unit. 2. The vehicle electronic control unit according to claim 1, wherein the control value stored in is acquired and output in accordance with a driving situation of the vehicle. 3. The vehicle electronic control unit according to claim 1, wherein the vehicle is a motorcycle. The vehicle electrical control unit according to any one of claims 1 to 3, wherein the electrical component is an electrical component of an engine of the vehicle. An electronic control unit for a vehicle according to any one of claims 1 to 4,
An adjustment device that can be connected to the electronic control unit and that can rewrite data in the nonvolatile memory and the volatile memory;
The adjusting device is an ideal value of the control value at the time of adjusting the control value and the same value as the control value stored in the non-volatile memory, and is acquired according to a driving situation of the vehicle. A data adjustment system for an electronic control unit of a vehicle, comprising: an adjustment amount calculation unit that calculates the adjustment data from a reference value and transmits the adjustment data to the volatile memory. The adjusting device has a storage unit for storing the previous SL control value adjusted by the adjustment data as update data, the tone Seitsui After the completion of the control value, the said update data in said storage unit 6. The data adjustment system for an electronic control unit of a vehicle according to claim 5 , wherein the data adjustment system is configured to transmit to a non-volatile memory.

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