JPH02169840A - Control unit detection device - Google Patents

Abstract

PURPOSE:To check the whole of software after change with ease by providing a simulation input giving device which gives reset signals to microcomputers of two control units with a same timing and a comparison judgement device. CONSTITUTION:A control unit 1A before the software change and a control unit 1B after the software change are set in a cheker 3 connected a personal computer 2. A signal generator 4 is connected to input sides of each unit 1A, 1B. Normal and transient operation mode data are supplied to the computer 2, and according to the signal therefrom, correspondent signals are output from the generator 4. First, a reset signal is given and the sampling timing is synchronized. Then the transient operation mode data is given. At this time, pulse differential detained from directly the units 1A, 1B or through actual loads 6A, 6B are compared and judged by a comparison judgement unit 7.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is used to check the suitability of the entire software when a part of the software (program and data) of a control unit for controlling in-vehicle electronic equipment is changed. Concerning control unit and component inspection equipment.

<Prior art> In an automobile engine control device (for example, an electronically controlled fuel injection device) or an autotransmission control device, a control unit with a built-in microcomputer
According to the program, calculations are performed based on input signals from various sensors and various data, and outputs to various electronic devices (for example, fuel injection valves) are controlled.

When software (programs and data) for a control unit of such a control device is created, it is necessary to check (debug) whether it operates without error according to control specifications.

In this case, it is common to use a checker to change the input signal according to the control specifications and check whether a corresponding output signal is output (see Utility Model Application No. 187347/1987) Kaisho 63-13540
(See Publication No. 1).

<Problems to be solved by the invention> However, in such conventional inspection devices,
When a part of the software is changed, it is possible to check the changed part using the above method, but there is a problem in that it is not possible to verify whether the part that has not been changed still operates as before.

In addition, when comparing two control units by applying an input corresponding to a transient operating state, there is a problem in that the difference in sampling timing causes a difference in the output of the control units even if the program operation is exactly the same. There was also.

In view of these conventional problems, the present invention provides a control unit inspection device that can easily and accurately check the entire software after the change when a part of the software of a control unit for controlling in-vehicle electronic equipment is changed. The purpose is to provide.

Means for Solving the Problems> Therefore, the present invention makes it possible to set two control units for controlling in-vehicle electronic equipment, one before the change and one after the change, and the same control unit for these two control units. It is equipped with a simulated input applying device that applies a reset signal to those microcomputers at a timing and then applies a simulated input corresponding to a transient operating state, and a comparison and determination device that compares and determines the outputs from each control unit at this time. Provides a control unit inspection device.

Function> In the control unit inspection apparatus described above, first, two control units are set, one before the software change and one after the change.

The version before the change mentioned here is one that is equipped with software that has already been used and has a proven track record.

Next, the two control units are operated by simultaneously applying the same simulated input to each other by the simulated input applying device.

During this operation, the comparison and determination device compares and determines the outputs from each control unit.

Here, regarding the changed portion, since a specific difference determined by the specification of the change should occur in the output, it is checked whether the difference is appropriate. There should be no difference in the output for the parts that have not been changed, so check whether there is a difference.

These allow you to check both changed and unchanged parts.

Also, when comparing two control units,
Inputs corresponding to transient operating conditions will cause differences in the output of the control unit even if the program operation is exactly the same due to differences in sampling timing. After applying a reset signal to these microcomputers, a simulated input corresponding to a transient operating state is applied, and the outputs at this time are compared and judged.

That is, after resetting each microcomputer at the same time and synchronizing the sampling timing, an inspection in a transient operating state is performed.

(Example) An example of the present invention will be described below.In addition, in a control unit of an electronically controlled fuel injection system for an engine, an electromagnetic fuel injection valve is supplied with a valve-opening drive pulse signal (hereinafter referred to as It outputs a fuel injection pulse (hereinafter referred to as an "interrupt injection pulse") and controls the fuel injection amount during that pulse, and also outputs a valve opening drive pulse signal (hereinafter referred to as an "interrupt injection pulse") asynchronous to engine rotation at the start of acceleration to improve acceleration response. Let's explain the case where this is done.

FIG. 1 shows an outline of the inspection apparatus, in which two control units IA and IB are set in a checker 3 connected to a personal computer 2.

One control unit 1'A is the one before the software change and is called a master unit that is equipped with software that has already been used and has a proven track record.

The other control unit IB is a unit under development after software changes, and is the subject of inspection.

A signal generator 4 is connected to the input side of each control unit IA, IB, thereby providing a simulated input. The simulated input involves creating appropriate steady-state operation mode data and transient operation mode data, feeding them to the personal computer 2, and causing the signal generator 4 to output a corresponding signal based on the signal from the personal computer 2. . Specifically, mode data is:
Reference signal REF for each reference crank angle outputted from the crank angle sensor in synchronization with engine rotation, unit signal PO3 for each unit crank angle, intake air flow rate Q, water temperature Tw, throttle valve opening TVO, battery voltage VB, etc. This is time series data.

Here, when providing transient operation mode data, for example, mode data in which the throttle valve opening degree TVO corresponding to acceleration increases rapidly over time, as shown in FIG. , I.B.
Give a reset signal at the same timing. Furthermore, since each control unit IA, IB is equipped with a reset signal that outputs a reset signal to the microcomputer when the battery voltage (3) decreases, it is possible to temporarily lower the battery voltage (3) as a simulated input. A reset signal is given by This reset signal is given to synchronize the sampling timing.

Therefore, the personal computer 2 and the signal generator 4 correspond to a simulated input providing device.

In addition, a feedback signal is obtained from a part of the output of each control unit IA and IB via each feedback model 5A and 5B, and this is transmitted to each control unit IA and IB.
, to the input side of IB.

This is used in place of the air-fuel ratio detection signal from an oxygen sensor, for example, and is calculated and given from data such as the fuel injection amount and intake air flow rate per engine rotation speed obtained by each control unit IA and IB.

Here, each control unit IAIB performs fuel injection control according to its own program.
From the following formula, the fuel injection pulse (pulse width) T to the fuel injection valve
Calculate i.

T i =T p −COBF−LAMBDA+T s
Here, Tp is the basic pulse width, and Tp=-Q/N. K is a constant, Q is the intake air flow rate, and N is the engine speed. Note that the engine speed N is calculated from the period of the reference signal REF, etc.

In addition, C0EF is the water temperature Tw, the throttle valve opening change amount Δ
'r v o, etc., LAMBD^ is an air-fuel ratio feedback correction coefficient based on an air-fuel ratio detection signal, and Ts is a voltage correction factor.

Each control unit LA, IB outputs a fuel injection pulse Ti at a predetermined timing based on the reference signal REF from the crank angle sensor.

Regarding interrupt injection control during acceleration, the throttle valve opening TVO is sampled at predetermined time intervals, and acceleration is determined based on the amount of change ΔTVO in the throttle valve opening.
When acceleration is determined, an interrupt injection pulse Tint having a pulse width corresponding to ΔTVO is output.

Actual loads 6A and 6B such as fuel injection valves are attached to the output side of each control unit IA and IB.

This is necessary when evaluating the back electromotive force and considering its influence.

The fuel injection pulse Ti or interrupt injection pulse T int taken out directly from the output side of each control unit IA, IB or via the actual loads 6A, 6B is:
Both are input to the comparison/determination device 7, and the difference between them is compared and determined. Note that only the comparison and determination of the interrupt injection pulse Tint in the transient operation mode will be described below.

As shown in FIG.
It has a measuring section 8A8B that measures the output state of t.

Each measurement unit 8A, 8B has at least one of the following
Measure one.

■Reference time (for example, reference signal R from the crank angle sensor)
The elapsed time from the point in time when EF occurs until the start of output of the interrupt injection pulse T int is measured.

(2) Measure the pulse width of the interrupt injection pulse Tint.

The measurement data from these measurement units 8A and 8B is input to the difference calculation circuit 9 in real time, and the difference is calculated.

The difference is then input to the comparison circuit 10 and compared with a predetermined comparison value.

Then, when the difference>comparison value, an output is generated from the comparison circuit 10, and this output becomes a latch signal and is sent to the ring memory (loop memory H2) in the large capacity memory 11.

The large capacity memory 11 includes each control unit IA, I
It is connected to B, and the program flow (data on the address bus and data bus) is input. and,
When a latch signal is input, the ring memory 12 stores the program flow (data on the address bus and data bus) before and after that time. Note that when new data is input to the ring memory 12, the oldest data is discarded.

The data in the ring memory 12 is subjected to, for example, visualization (graphics) processing by the processing device 13, and sent to the personal computer 2, where it is displayed on its display in an appropriate manner.

In this way, the changed part of the software should cause a certain difference in the output state determined by the specification of the change,
There should be no difference in the output state for the parts that have not been changed, so compare the difference with the predetermined comparison value,
If the difference>comparison value, it is determined that there is an abnormality in the software, and thereby both changed parts and unchanged parts can be checked. Moreover, when an abnormality is determined, the flow of the program before and after that time can be temporarily stored, making it easier to discover and correct the abnormal part.

When comparing IA and IB (two control units), when inputting the throttle valve opening TVO change corresponding to the transient operating state to Sakae, as shown in Figure 4,
Due to the difference ΔS in each sampling timing, even if the program operation is exactly the same, the acceleration judgment timing is different and the ΔTVO at that time is different, which causes a difference in the output timing and pulse of the interrupt injection pulse T int. , when providing such simulated human power,
As shown in Figure 2, two control units I
A reset signal is given to those microcomputers at the same timing to synchronize the sampling timing to AIB, and then an input of the throttle valve opening TVO change is given, and the interrupt injection pulse T in at this time is given.
Compare and judge the output of t.

This enables accurate inspection without being affected by sampling timing.

<Effects of the Invention> As explained above, according to the present invention, when a part of the software of the control unit is changed, when the same simulated input is given to the software with a proven track record before the change, By comparing and determining the output, both changed parts and unchanged parts can be easily and reliably checked (debugged), resulting in the effect of greatly improving reliability.

Also, when applying an input corresponding to a transient operating state,
A reset signal is given to the microcomputers of the two control units at the same timing to synchronize the sampling timing, and then a simulated input corresponding to a transient operating state is given, and the output at this time is compared and judged. Accurate inspection is possible without being affected by differences in sampling timing.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of the entire inspection device showing an embodiment of the present invention, Fig. 2 is a timing chart showing simulated human power and its output, and Fig. 3 is a portion of the comparison/judgment device in Fig. 1. FIG. 4 is a timing chart showing a conventional simulator saw and its output. IA IB...Control unit 2...
Personal computer 3... Checker 4...
・Signal generator 6A, 6B...Actual load 7・
...Comparison and judgment device 8A, 8B...Measurement section 9.
...Difference calculation circuit 10...Comparison circuit 11...
Large capacity memory 12...Ring memory patent applicant Japan Electronics Co., Ltd. Representative Patent attorney Fujio Sasashima

Claims (1)

[Claims] This is a control unit inspection device that checks the operation of a control unit for controlling in-vehicle electronic equipment after software changes.It is possible to set two control units, one before the change and one after the change, and the control unit for these two A simulated input applying device that applies a reset signal to the microcomputers to the units at the same timing and then applies a simulated input corresponding to a transient operating state, and a comparison and determination device that compares and determines the outputs from each control unit at this time. Control unit inspection equipment.