JPH01224442A - Engine control device - Google Patents

Abstract

PURPOSE:To simplify the configuration of a circuit by equipping an engine control device with a universal pulse processor, and using different programs for giving function to this processor when the car is running normally and abnormally. CONSTITUTION:An engine control device 1 is chiefly composed of a microcomputer 2 and a universal pulse processor 3. The universal processor 3 controls an injector 6 and an ignition coil power transistor 7 through respective driver circuits 4, 5. At this time, different programs are used for giving function to the universal pulse processor 3 when the car is running normally and abnormally, and thereby fuel injection and/or ignition system is changed over. This simplifies the circuitry configuration of the engine control device 1 and reduces the cost.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an engine control device for an internal combustion engine, and particularly to a control method for the engine control device when a crank angle sensor is abnormal.

[Conventional technology]

Conventional engine control devices, when the crank angle sensor is abnormal,
Depending on the hardware configuration, it has the minimum necessary fuel control, 2-ignition control, etc. for vehicle operation.

[Problem to be solved by the invention]

In the above-mentioned conventional technology, in addition to the configuration that performs the normal function, the function that is performed when the crank angle sensor is abnormal is configured by hardware, and therefore a backup circuit, a select circuit, etc. for the crank angle sensor are required. Therefore, there was a problem that the circuit configuration became complicated and the cost further increased.

An object of the present invention is to provide an engine control device that eliminates the drawbacks of the prior art described above.

[Means to solve the problem]

The above purpose is to
The program that gives the function to PP has been changed to inject fuel asynchronously to the engine speed.

This is achieved by performing ignition control, etc.

[Effect]

When the engine control device receives the starter signal and the crank angle sensor signal, it determines that the device is normal and stores a program that gives the UPP a normal function.
Perform optimal engine control.

In the unlikely event that a crank angle sensor signal is not input within a predetermined period when a starter signal is input, it is determined that an abnormality has occurred, and a program that provides a function in the event of an abnormality is stored in the UPP. Thereby, the minimum necessary control for driving can be performed.

〔Example〕

FIG. 1 is an overall configuration diagram of an embodiment of the present invention.

1 is an engine control device, 2 is a CPU (microcomputer), 3 is a UPP (universal pulse processor), and 4 is an EGI (fuel injection) drive circuit.

5 is an IGN (ignition coil power transistor) drive circuit, 6 is an injector, and 7 is an ignition coil power transistor.

This example is applied to a 4-cylinder engine,
Four injectors are injected at the same time every engine revolution, and ignition is by a distributed power distribution system.

Further, REF and POS in the figure are crank angle sensor signals, and the cylinder signal at a crank angle of 180° is referred to as REF.

Furthermore, it turns ON and 0FFL every 1°.

An angle signal having a 90° pulse between REF is called POS.

In addition, UPP 3 is a programmable pulse input/output module that has pulse input/output terminals for multiple general-purpose registers such as counters, shifters, compare registers, or capture registers, and can automatically control the engine by programming functions. can be done,
The load on the CPU 2 can be significantly reduced. Symbols in UPP3 represent commands, each of which performs the following control.

FRCt*z: Free Run Count
Count POS pulses from erREF and give EGI injection timing 0FFSET. (FR
Cl)FRC2 is similarly counted and gives one ignition timing ADV.

I NCI, Z, 3: Internal Cou
POS pulses between interREF are counted and self-diagnosis is performed. (INCl) Counts the system clock in the UPP and gives the period T1 (INCz) - Ta (INCa).

OS Ct+2: One 5hot Count
Give EGI pulse from erOFFSET.

(○5C1) Give DELL from ADV.

(OS Cz) PWC*,z: Pulse Width Cou
Give the interEGI pulse width T2.

(PWCI) Give IGN's DELL T4.

(PWCz) The UPP function shown in Fig. 1 is for normal operation, and the EGI and IGN pulses are output from the UPP in synchronization with the engine speed using REF and POS as the basic clock, and each drive circuit 4 , 5, the injector 6 and the ignition coil power transistor 7 are controlled. Note that the data of 08C1°08Cz is written as data calculated by the CPU 2 based on various data representing the operating state such as intake air amount, engine speed, battery voltage, water temperature, etc., so that optimal control can be performed.

Next, the abnormality of the crank angle sensor will be explained with reference to FIG. Although only the UPP 3 is shown in FIG. 2, the other configurations are the same as in FIG. 1.

In the unlikely event that the starter signal is input when starting the engine and the REF signal is not input within a predetermined period, it is determined that the crank angle sensor is abnormal and the UPP function allocation is given as shown in FIG. In this embodiment, the period and pulse width of EGI and IGH are set using the system clock in the UPP instead of the REF and PO8 signals of the crank angle sensor.

INCz sets the arbitrary period T1 of EGI to P W
C1 sets the EGI injection pulse width T2.

Furthermore, the ION cycle 3 is set with INCa, and the energization time (DWELL) is set with PWC2. With the above settings, fuel injection 2 ignition control can be performed asynchronously with engine rotation without depending on the crank angle sensor signal. Furthermore, TI, T! , Ta*Ta indicates the driving state of the vehicle. Intake air amount, throttle sensor signal (idle, partial, full throttle), vehicle speed.

It is calculated by the CPU 2 based on data such as A/CON and OFF, and can be set arbitrarily.

Next, a method for determining whether the crank angle sensor is normal or abnormal will be explained with reference to the flowchart shown in FIG.

When starting the engine, take in the starter signal (100),
Start timer T. (101) If the REF signal is detected within the predetermined time TN, it is determined that the crank angle sensor is normal, and the normal function is stored in UPP.

(102-103) If REF is not detected within the predetermined time TN, it is determined that the crank angle sensor is abnormal, and
Store the function at the time of abnormality in PP. (102~
As described above, when the crank angle sensor is abnormal, it becomes possible to perform the fuel injection 2 ignition control asynchronously with the engine rotation, and the vehicle can travel to the dealer 2 repair shop.

〔Effect of the invention〕

According to the present invention, abnormality of the crank angle sensor can be determined;
By changing the function configuration within the UPP, fuel injection 9 ignition control, etc. can be performed to enable the vehicle to run. Furthermore, since no hardware configuration is required for crank angle sensor backup, the cost is low.
This has the effect of providing a simple engine control device.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram of an embodiment of the present invention, FIG. 2 is a UPP function allocation diagram when a crank angle sensor is abnormal, and FIG. 3 is a flowchart of the embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Engine control device, 2... CPU (microcomputer), 3... UPP (universal pulse processor), 4... EGI drive circuit, 5...
IGN drive circuit, 6... Injector, 7... Ignition coil power transistor. Figure 1 Figure 2 Figure 3

Claims (4)

[Claims] 1. An engine control device that receives signals from a group of sensors that detect engine conditions and controls at least the amount of fuel injection is equipped with a manipulative pulse processor (hereinafter referred to as UPP) that has programmable pulse input/output, a counter, a compare register, etc. , when the vehicle is running normally,
An engine control device characterized in that the engine control device is configured to change a program for giving a function to UPP and switch fuel injection, ignition method, etc. in case of an abnormality. 2. In claim 1, the engine speed,
If the crank angle sensor that detects the piston position is abnormal,
An engine control device characterized by being provided with means for controlling fuel injection, ignition, etc. asynchronously with engine rotation. 3. 2. The engine control device according to claim 1, further comprising means for detecting a crank angle sensor abnormality by inputting a starter signal and determining that the crank angle sensor signal is not input within a predetermined period. 4. An engine control device that receives signals from a group of sensors that detect engine conditions and controls at least the amount of fuel injection is provided with a programmable register, and changes the function given to the register when the vehicle is normal and when the vehicle is abnormal. An engine control device characterized by being configured to switch injection, ignition control methods, etc.