JP2666897B2 - Engine throttle valve controller - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an engine throttle valve control device. (Prior Art) Recently, a throttle valve, which has been controlled to open and close mechanically in association with the depression operation of an accelerator pedal using a continuous means such as a wire, has been used as an accelerator by using an electric drive means such as a stepping motor. The opening and closing control is performed independently of the pedal, and the opening is basically controlled based on the basic characteristics corresponding to the depression opening (operation opening) of the accelerator pedal, while the opening is controlled in a predetermined operation region. There has been proposed a throttle valve control device for an engine in which a favorable running feeling is obtained by correcting the above basic characteristics in a positive or negative direction independently of the accelerator opening (for example, see Japanese Patent Application Laid-Open No. H11-163873). 61-2
No. 32345). In such a throttle valve control device for an engine, for example, as shown in FIG. 6, the throttle valve is increased by a predetermined opening beyond a basic characteristic corresponding to the accelerator opening AC · θ within a predetermined period after the transmission upshift. If the correction is made, the acceleration expansion during the shift-up shift is improved, and the traveling feeling is particularly improved. Looking at the action during this time for each gear position of the transmission, as is clear from FIG. 6, for example, when the vehicle is shifted from the neutral state to the first speed gear and accelerated, the responsiveness improves so that the engine rotation is blown up. In the case where the second gear is shifted up from the second speed to the third speed and the fourth speed, the increase correction value is sequentially increased accordingly. Elongation is improved. (Problems to be Solved by the Invention) However, when the throttle valve control system having the above-described configuration is employed, the responsiveness is particularly improved in the case of the first low-speed gear as described above. In the case of the 3rd and 4th speed gears from the 2nd speed gear to the high speed side, there is an advantage that the feeling of extension of acceleration becomes better according to the increase of the correction amount. In spite of the fact that the throttle valve opening is relatively large opened due to the upshift, the throttle valve opening becomes considerably larger by the above-described control. In an engine equipped with an exhaust gas purifying device or the like, there is a problem that the engine shifts to a high-load enrichment zone for reducing the exhaust gas temperature as shown in FIG. (Means for Solving the Problems) The present invention has been made for the purpose of solving the above problems, and for that purpose, accelerator opening detecting means for detecting an accelerator opening, and accelerator opening detecting Throttle valve control means for electrically driving and controlling the throttle valve opening in accordance with the accelerator opening detected by the means; shift state detecting means for detecting a shift state of the transmission; and shift state by the shift state detecting means. Is detected, the control opening correction means for correcting the control opening in accordance with the accelerator opening of the throttle valve control means by a predetermined opening increase. When the engine air-fuel ratio shifts to a high-load enrichment region by correcting the opening, a correction suppressing means is provided to suppress the above-mentioned control opening increase correction operation. It is. (Operation) According to the problem solving means of the present invention, while the throttle valve can be electrically and independently controlled in accordance with the accelerator opening, the shift state of the transmission is detected and the shift state is detected. In the engine in which the throttle valve is corrected to increase by a predetermined opening from the actual opening within a predetermined period after the detection of the engine opening, the engine air-fuel ratio is increased by the control opening increase correcting operation by the control opening correcting means. When the vehicle enters the load enrichment region, the correction suppression means operates to suppress the increase in the control opening, thereby preventing the shift to the high load enrichment region. (Embodiment) First, FIGS. 2 and 3 show a throttle valve control device for an automobile gasoline engine when the present invention is applied to the engine. FIG. 2 shows control of the above-described embodiment device. FIG. 3 is a schematic diagram of the system, and FIG. 3 is a flowchart showing a control operation of an engine control unit in the control system. First, the outline of the control system according to the embodiment of the present invention will be described with reference to FIG. 2, and then the description of the control contents in FIG. 3 will be started. In FIG. 2, reference numeral 1 denotes an engine body,
The intake air is taken in from the outside via the air cleaner 130, and then supplied to each cylinder via the air flow meter 2 and the slot chamber 3. The fuel is also filtered from the fuel tank 13 by the fuel pump 10 to the fuel filter.
The fuel is supplied to the engine side through a fuel passage 12 interposed therebetween and is injected by a fuel injector 9 installed in an intake port of the engine. The amount of intake air to the cylinder during traveling is
The electronic control type throttle valve 6 provided in the throttle chamber 3 and driven by a stepping motor 7 controls the adjustment. The opening of the throttle valve 6 is basically controlled electrically in accordance with the operation opening AC · θ of the accelerator pedal 30, and is maintained at the minimum opening in the idle motion state. The stepping motor 7 is provided integrally on the outside of the throttle chamber 3 and is driven by a throttle valve control pulse signal S _TVO supplied from an engine control unit (hereinafter referred to as ECU) 90 to be described later. the valve 6 is adapted to control the throttle valve opening degree corresponding to the control signal value (target throttle valve opening degree TVO _T). The control signal value is obtained by calculating the detected value AC · θ of the accelerator opening degree detecting means 31 provided on the accelerator pedal 30 to a gear position GP ₁ , G-
A value arbitrarily increased and corrected according to P ₂ , GP ₃ , and GP ₄ is used. The throttle valve 6 is provided with a throttle opening sensor 16 which detects the actual throttle opening TVO and inputs it to the ECU 90. Reference numeral 4 denotes a three-way catalytic converter 8 and an O ₂ sensor 20.
1 shows an exhaust pipe of an engine provided with each of the above. On the other hand, reference numeral 14 is an ignition plug provided in the cylinder head portion of the engine body 1, and a predetermined ignition voltage is applied to the ignition plug 14 via a distributor 23 and an igniter 18. The application timing of the ignition voltage, that is, the ignition timing is controlled by an ignition timing control signal _Igc supplied from the ECU 90 to the igniter 18. further,
Reference numeral 19 is a boost pressure sensor detects engine boost pressure P _o corresponding to the engine load is input to the ECU 90. The ECU 90 includes, for example, a microcomputer (CPU) as an arithmetic unit, a knock determination circuit, and a memory (ROM).
And RAM), an interface (I / O) circuit, and the like. In addition to the above detection signals, the interface circuit of the ECU 90 receives, for example, an engine start signal (ECU trigger) from a starter switch (not shown), an engine speed detection signal N from the engine speed sensor 15, and a water temperature thermistor. Various detection signals such as a detection signal of the detected engine coolant temperature and an intake air amount detection signal Q detected by the air flow meter 2 are also input. On the other hand, reference numeral 21 denotes, for example, a lock-up torque converter type automatic transmission with an overdriving mechanism connected to the output shaft of the engine body 1. The automatic transmission 21 includes, for example, a lock-up mechanism including a lock-up clutch 22, a lock-up control valve 23, a lock-up solenoid 24, a lock-up control unit 32, an over-driving gear 27, an over-driving valve 28, an over-driving solenoid. 34, an overdriving mechanism including an overdriving switch 35 and the like, a gear train portion 26 of the transmission itself, and a centrifugal governor 29 for detecting the rotational speed provided on the transmission output shaft side via the gear train portion 26, The above lock-up control valve 23, overdriving gear 27, overdriving valve 2
8, a control valve 33 for controlling the gear train section 26 and the like, a kick down solenoid 36, a kick down switch 37 and the like. Then, the lock-up control unit 32
Determines overdrive and lock-up OK conditions based on input signals from various sensors, and when each of the conditions is OK, the kick down solenoid 36,
The lock-up control valve 23, the over-driving gear 27, the over-driving valve 28, the gear train 26 and the like are controlled to be operable via the control valve 33, and a lock-up signal is supplied to the lock-up solenoid 24 to lock the lock-up mechanism. By operating the up clutch 22, the torque converter is locked up. Further, reference numeral 41 denotes a shift lever portion of the automatic transmission 21.
This is an inhibitor switch installed at 40, which detects the operation position PND of the shift lever 42 of the automatic transmission 21 and inputs the detection signal to the transmission control unit 50. As described above, the transmission control unit 50 is also configured to receive the detection value AC · θ of the accelerator opening detection means 31, and the transmission state of the automatic transmission based on the accelerator opening θ and A signal necessary for performing the above-described throttle valve opening control (control opening correction) according to the position of the transmission gear is supplied to the ECU 90. Signals required for controlling the opening of the throttle valve include, for example, a shift position detection signal of the inhibitor switch 41 and a transmission gear position detection signal. These signals are transmitted together with the basic throttle valve opening and the transmission control unit. It is supplied from the 50 side to the engine control unit 90 side. Next, the throttle valve control operation of the ECU (engine control unit) 90 shown in FIG.
This will be described in detail with reference to the drawings. First, read the accelerator opening AC · theta which is the output of the accelerator opening detection means 31 in step S _1, followed by proceeding to step S _2, the actually read using the map of FIG. 4 above The throttle opening (basic target value) TVO ₀ corresponding to the accelerator opening AC · θ is calculated. Next, step S ₃
To the transmission gear position of the automatic transmission (the gear train portion automatically set in accordance with the shift position and the vehicle speed).
26 is read, and a correction value ΔTVO for correcting the throttle valve opening TVO to a predetermined opening increase corresponding to the transmission gear position GP (the correction value ΔTVO is the correction value ΔTVO). gear position G-P ₁ of the _{machine, G-P 2, G-} P 3, ΔTVO 1 and each individually corresponding to _{G-P 4, ΔTVO 2,} ΔTVO 3, calculates the .DELTA.TVO ₄ is set) . Then, further proceeds to step S ₅ determines the shift-up to high-speed gears, namely whether the shift gear is shifted up to the third speed to fourth speed. As a result, when it is determined YES, and subsequently after reading the actual boost pressure P ₀ of the first engine proceeds to step S _0, setting the engine boost pressure P _o of said actual is given in the next step S ₇ It is determined whether or not the value is equal to or less than the value A.
Proceed to _8, the process proceeds to step S _9, fix the value of the fourth gear G-P ₄ of the correction value .DELTA.TVO the original value of ₄ values .DELTA.TVO ₄ smaller than .DELTA.TVO _3. As a result, even in the acceleration state, which has conventionally been in the enrichment region shown in FIG. 5 in the conventional case of the third to fourth speeds, the exhaust gas temperature rises so that the vehicle does not enter the enrichment region and actually requires the enrichment control. , The enrichment control is not performed. On the other hand, when it is judged NO in step S _5, S _7, each process directly proceeds to step S _9. In step S _9, the step S ₄ in the calculated throttle correction value .DELTA.TVO or step S ₈ final target throttle opening TVO based on the throttle correction value .DELTA.TVO ₃ substituted with _T a (TVO _T = TVO + .DELTA.TVO) calculated, actually to control the throttle valve opening TVO based on TVO _T. (Effect of the Invention) As described above, the throttle valve control device for an engine according to the present invention includes an accelerator opening detecting unit that detects an accelerator opening, and an accelerator opening detected by the accelerator opening detecting unit. Throttle valve control means for electrically driving and controlling the throttle valve opening in accordance therewith, shift state detecting means for detecting the shift state of the transmission, and the throttle when the shift state is detected by the shift state detecting means. An engine air-fuel ratio is controlled by correcting the control opening by the control opening correction means, the control opening being corrected by a predetermined opening increase correction of the control opening corresponding to the accelerator opening of the valve control means. In a case where the vehicle shifts to a high-load enrichment region, a correction suppressing means for suppressing the above-mentioned control opening increase correction operation is provided. That is, the throttle valve control device for the engine of the present invention enables the throttle valve to be independently and electrically controlled in accordance with the accelerator opening while detecting the shift state of the transmission as described above. Then, in an engine in which the throttle valve is corrected to increase by a predetermined opening from the actual opening within a predetermined period after the detection of the shift state, the control opening correcting means increases and corrects the control opening by the control opening correction means. When the engine air-fuel ratio enters the high-load enrichment region, the correction suppression means operates to suppress the increase in the control opening, thereby preventing the shift to the high-load enrichment region. Therefore, while practically realizing the acceleration expansion in the low-medium-speed gear region where transmission is originally required to be the highest in practical use, for example, and realizing the acceleration expansion in the high-speed gear region, etc. It is possible to prevent necessary deterioration of fuel efficiency.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram corresponding to claims of the present invention, FIG. 2 is a system block diagram of a throttle valve control device for an engine according to an embodiment of the present invention, and FIG. FIG. 4 is a characteristic chart showing the relationship between the accelerator opening and the throttle opening in the same system, and FIG. 5 is a flowchart showing the control operation of the engine control unit. And FIG. 6 is an operation characteristic diagram showing a control operation of a conventional throttle valve control device for an engine. 1 ...... engine body 2 ...... airflow meter 6 ...... throttle valve 7 ...... stepping motor 9 ...... fuel injector 19 ...... boost pressure sensor 20 ...... O ₂ sensor 21 ...... automatic transmission 26 ...... Giyatoren 30 ... ... accelerator pedal 31 ... accelerator opening detecting means 40 ... shift lever 41 ... inhibitor switch

Claims (1)

(57) [Claims] Accelerator opening detecting means for detecting the accelerator opening,
Throttle valve control means for electrically driving and controlling the throttle valve opening in accordance with the accelerator opening detected by the accelerator opening detecting means; shift state detecting means for detecting a shift state of the transmission; When the speed change state is detected by the detection means, the engine is provided with control opening correction means for correcting the control opening according to the accelerator opening of the throttle valve control means to a predetermined opening increase. An engine throttle valve provided with correction suppression means for suppressing the control opening increase correction operation when the engine air-fuel ratio shifts to a high-load enrichment region by correction of the control opening by the degree correction means. Control device.