JP2007077888A - Engine control method and device for vehicle and motorcycle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To promptly optimize engine speed in a fast idle time. <P>SOLUTION: This engine control device is provided with: a detection part 63 for the number of revolutions for detecting the number of revolutions of an engine 12; a fast idle control part 66 for executing feedback control by correcting the opening of a sub-throttle valve 42 so as to bring an actual number of revolutions detected by the detection part 63 for the number of revolutions in a fast idle time close to a target number of revolutions; and an initial opening setting part 67 for setting the initial opening of a main throttle valve 40 at a value when an actual number of revolutions was set within an allowable range of a target number of revolutions in the prior fast idle time by interlocking it with setting of the initial opening of the sub-throttle valve 42 in a fast idle time at a value when the actual number of revolutions was set in an allowable range of a target number of revolutions in the prior fast idle time. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an engine control method, an apparatus, and a motorcycle for controlling idling (first idle) of a vehicle such as a motorcycle, a personal watercraft (PWC), and a rough terrain vehicle (ATV). It is about.

  In recent motorcycles, a throttle body in which two valves, a main throttle valve and a sub-throttle valve, are provided in series with respect to the intake flow direction may be used as an intake device that adjusts the intake flow rate to the engine. . The main throttle valve is opened and closed by a driver's operation of a throttle grip or a throttle lever (hereinafter simply referred to as a throttle grip) transmitted through a cable, while the sub throttle valve is driven by a motor to be controlled by an ECU (Electric Control). Opening is controlled by Unit). And when the main throttle valve suddenly opens and closes due to throttle operation, the opening of the sub-throttle valve is adjusted to alleviate sudden fluctuations in the intake air flow, thereby smoothing changes in engine speed and improving driving feeling. I am letting.

  The throttle body may be configured such that when the sub-throttle valve is opened while the main throttle valve is closed, the rotation of the sub-throttle valve is transmitted to the main throttle valve via a link mechanism (for example, Patent Document 1). In the throttle body of this configuration, when idling (first idle) at the time of engine start, the main throttle valve is opened by a small angle in conjunction with the opening operation of the sub throttle valve in response to a command from the ECU, so that a desired intake air can be obtained. The flow rate is secured to stabilize the combustion. Moreover, by adjusting the opening of the sub-throttle valve while detecting the actual engine speed, the opening of the main throttle valve linked to the sub-throttle valve is adjusted, and the engine speed is set to a predetermined target speed. Since the feedback control is performed to approach the engine speed, the engine speed can be adjusted to the target speed even if the opening of the sub-throttle valve that achieves the target speed fluctuates due to the operating environment. ing.

In addition, there is an intake device having another configuration in which only one throttle valve is provided in the intake passage of the throttle body. In this intake device, the ECU operates the actuator based on information from the sensor that detects the operation amount of the throttle grip, thereby opening and closing the throttle valve to a required opening degree, and ensuring the intake flow rate according to the throttle operation amount. So that it is controlled. Also in this case, during the first idle, the engine speed is adjusted to a predetermined target speed by adjusting the throttle valve opening in accordance with a command from the ECU while detecting the actual engine speed. What is necessary is just to perform feedback control.
Japanese Patent Laid-Open No. 2005-106048

  However, in the case of the invention described in Patent Document 1, feedback control of the valve opening degree is performed in order to optimize the engine speed at the time of first idling, but the state is reset every time the engine is started. Since the feedback control is started from this time, it takes the same time each time to bring the engine speed close to the target speed. In particular, in order to prevent the engine from stopping immediately after starting the engine, the engine speed is increased greatly by temporarily increasing the fuel injection amount and then gradually decreased to the target speed. If the state where the number is high continues for a long time, it is not preferable from the viewpoint of exhaust gas reduction.

  Therefore, an object of the present invention is to make it possible to quickly optimize the engine speed at the time of first idling.

  The present invention has been made in view of the circumstances as described above, and the vehicle engine control method according to the first aspect of the present invention is the opening of a throttle valve that adjusts the intake air flow rate to the engine at the time of first idling. Is an engine control method that performs feedback control so that the actual engine speed approaches the target engine speed, and the initial opening of the throttle valve at the time of first idling is set to the actual speed at the time of the previous first idling. The opening is set when the number falls within the allowable range of the target rotational speed.

  In this way, the opening of the throttle valve when the actual engine speed falls within the allowable range of the target engine speed by feedback control during the previous first idle is determined as the initial throttle valve at the next first idle. Since the learning function used as the opening is provided, the time required to bring the actual engine speed close to the target engine speed during the first idling is shortened. Therefore, it is possible to quickly optimize the engine speed at the time of first idling, which contributes to exhaust gas reduction.

  An engine control device for a vehicle according to a second aspect of the present invention includes a rotation speed detection unit that detects an actual rotation speed of the engine, and an opening degree of a throttle valve that adjusts an intake air flow rate to the engine during first idle. The first idle control unit that performs feedback control so that the actual rotational speed detected by the rotational speed detection unit approaches the target rotational speed, and the initial opening of the throttle valve at the time of the first idle And an initial opening degree setting unit that sets an opening degree when the actual rotation speed falls within an allowable range of the target rotation speed during the first idle.

  In this way, similarly to the above, the throttle valve opening when the actual engine speed falls within the allowable range of the target engine speed by feedback control at the time of the previous first idling is determined as the throttle valve at the next first idling. Since the learning function used as the initial opening is provided, the time required to bring the actual engine speed close to the target engine speed is shortened. Therefore, it is possible to quickly optimize the engine speed at the time of first idling, which contributes to exhaust gas reduction.

  The first idle control unit indirectly controls the opening of the throttle valve linked to the sub-throttle valve by controlling the opening of the sub-throttle valve arranged in parallel with the throttle valve in the intake direction. You may do it.

  In this case, a so-called double throttle valve mechanism is used to drive the sub-throttle valve with an actuator (for example, a motor), so that the actual rotational speed is within the allowable range of the target rotational speed at the time of the previous first idle. By setting the opening when it is within the range, the main throttle valve that is linked to the movement of the sub-throttle valve is opened when the actual engine speed is within the allowable range of the target engine speed during the previous first idle. The intake air flow rate can be secured stably. In the case of a so-called single throttle valve, the opening of the throttle valve is directly controlled so as to be the opening when the actual rotational speed is within the allowable range of the target rotational speed at the time of the previous first idle. That's fine.

  The initial opening setting unit may determine a value obtained by adding a previous opening correction amount to a predetermined reference opening at the time of first idling as the initial opening.

  In this way, the initial opening of the throttle valve at the time of fast idling can be easily obtained by simply performing a simple calculation for adding the opening correction amount to the predetermined reference opening.

  It is possible to store information without receiving power supply, and includes a correction amount storage unit that stores the opening correction amount of the throttle valve at the end of the feedback control, and the initial opening setting unit stores the correction amount storage The initial opening may be determined using the previous opening correction amount read from the unit.

  In this way, even when the vehicle power is turned off, the opening correction amount used for feedback control at the next first idle can be stored. The correction amount storage unit is preferably a nonvolatile semiconductor memory such as an EEPROM or a flash memory. Also, rather than storing the opening correction amount at the end of the feedback control, the throttle valve opening itself at the end of the feedback control is stored in the storage unit, and the opening is used as it is for the next initial opening. It may be used as

  A temperature sensor that directly or indirectly detects the temperature of the engine, wherein the first idle control unit is configured such that the actual rotational speed is within an allowable range of the target rotational speed based on the temperature detected by the temperature sensor; The time for controlling the opening degree of the throttle valve may be determined so as to be within the range.

  In this way, when the engine temperature is low, the warm-up time for maintaining the engine speed at the target speed is increased, while when the engine temperature is high, the warm-up time for maintaining the engine speed at the target speed is shortened. Thus, efficient warm-up operation can be performed. In addition, it is possible to contribute to reduction of exhaust gas by shortening the time for maintaining the engine speed at the target speed that is higher than that during normal idling in accordance with the engine temperature.

  The first idle control unit may hold the opening degree of the throttle valve in a state at a time when the feedback control is ended during a predetermined time after the feedback control is ended.

  In this way, it is possible to secure sufficient time for maintaining the rotational speed necessary for the first idle while the feedback control is quickly finished when the actual rotational speed of the engine falls within the allowable range of the target rotational speed. .

  The present invention also provides a motorcycle including the engine control device described above.

  As is clear from the above description, according to the present invention, the proper opening of the throttle valve at the time of first idling is learned, so that the actual engine speed can be brought close to the target speed at the time of first idling. Is shortened. Therefore, it is possible to quickly optimize the engine speed at the time of first idling, which contributes to exhaust gas reduction.

  Hereinafter, an embodiment according to the present invention will be described by taking a motorcycle which is a kind of vehicle as an example. The direction concept used in the following description is based on the direction seen from a rider (not shown) riding the motorcycle.

  FIG. 1 is a partially cutaway side view of a road sports type motorcycle 1 employing an engine control apparatus according to an embodiment of the present invention. As shown in FIG. 1, a motorcycle 1 includes a front fork 2 provided in a substantially vertical direction with a predetermined caster angle, and a front wheel 3 as a steering wheel is rotatably supported below the front fork 2. Has been. A bar-type steering handle 4 is attached to the top of the front fork 2 via a steering shaft (not shown). The steering shaft is pivotally supported by a head pipe 5 constituting a frame, and the front wheel 3 is steered in a desired direction by the rider swinging the steering handle 4 to the left and right.

  A pair of left and right main frames 6 extend rearward from the head pipe 5, and a pair of left and right pivot frames 7 are provided at the rear of the main frame 6. A front part of a swing arm 8 extending substantially in the front-rear direction is pivotally supported on the pivot frame 7, and a rear wheel (traveling drive part) 9 as a drive wheel is rotatably supported on the rear part of the swing arm 8. ing. A fuel tank 10 is provided behind the steering handle 4, and a seat 11 for riding a driver is provided behind the fuel tank 10.

  A parallel four-cylinder engine 12 is mounted between the front wheel 3 and the rear wheel 9 while being supported by the main frame 6 and the pivot frame 7. An exhaust pipe 16 is connected to the exhaust port of the engine 12, and four throttle devices 13 disposed inside the main frame 6 are connected to the intake port. An air cleaner box 14 disposed below the fuel tank 10 is connected to the upstream side of the intake air, which is the upper part of the throttle device 13, and is configured to take in outside air using traveling wind pressure (ram pressure) from the front. Yes. Further, the air cleaner box 14 is also connected to an exhaust port of the engine 12 by a secondary air supply pipe (secondary air supply path) 31. A cowling 17 is provided so as to cover the engine 12 and the like from the front of the vehicle body to both sides of the vehicle body.

  FIG. 2 is an enlarged view of the engine 12 of the motorcycle 1 and its surroundings. As shown in FIG. 2, the engine 12 is connected to a crankcase 23 that houses the crankshaft 18, a cylinder block 20 that is connected to the upper part of the crankcase 23 to form a parallel four-cylinder, and an upper part of the cylinder block 20. The cylinder head 20 is provided with a cylinder head 21 that forms a combustion chamber together with the cylinder block 20 and is provided with a DOHC type valve system, and a cylinder head cover 19 that covers an upper portion of the cylinder head 21. The crankcase 23 includes a main shaft 27 that rotates in conjunction with the crankshaft 18, a countershaft 28 that transmits power to the rear wheel 9 via a chain, and a gear train (not shown) that couples these to each other in a freely variable manner. ) Is accommodated to constitute a speed change mechanism. Below the crankcase 23, an oil pan 24 for temporarily storing the lubricating oil is attached, and the lubricating oil is sent to various parts of the engine 12 by an oil pump 29 to perform lubrication and cooling.

  In the front part of the cylinder head 21, four exhaust ports 30 for discharging exhaust from the engine 12 are opened forward and obliquely downward (only the leftmost exhaust port is shown in FIG. 2). An upstream end of the exhaust pipe 16 is connected to the exhaust port 30. Four intake ports 25 that supply intake air to the combustion chambers of the cylinders of the engine 12 are formed at the rear of the cylinder head 21 (only the leftmost intake port is shown in FIG. 2). A throttle device 13 is connected to the intake port 25, and an air cleaner box 14 is connected to the upper portion of the throttle device 13. The air cleaner box 14 is also connected to the exhaust port 30 via the secondary air supply pipe 31. By introducing fresh air into the exhaust port and reburning the exhaust gas, CO (carbon monoxide) and HC (Hydrocarbon) is reduced to purify exhaust gas.

  The crankcase 23 is provided with a crank angle sensor 33 that detects the rotation angle of the crankshaft 18, a gear position sensor 37 that detects the transmission gear position, and a water temperature sensor 26 that detects the coolant temperature of the engine 12. Yes. The cylinder head 21 is provided with a cam angle sensor 35 that detects the angle of a cam that drives a DOHC type exhaust valve (not shown).

  FIG. 3 is a left side view of the throttle device 13. FIG. 4 is a schematic cross-sectional view of the main part of the throttle device 13. As shown in FIGS. 3 and 4, the throttle device 13 is provided with a throttle body 38 having four intake passages 54 connected to the four intake ports 25 (see FIG. 2) of the engine 12. Each intake passage 54 of the throttle body 38 is provided with a disk-shaped main throttle valve (throttle valve) 40 on the downstream side so as to be openable and closable while being attached to the main throttle shaft 39, and a disk-like shape on the upstream side. The sub-throttle valve 42 is attached to the sub-throttle shaft 41 so as to be opened and closed. The throttle body 38 is provided with an injector 47 for injecting fuel into each intake passage 54, and an intake pressure sensor 36 for detecting the intake pressure in each intake passage 54.

  As shown in FIG. 3, a main throttle pulley 43 connected to a main throttle shaft 39 is provided at the left end of the throttle body 38. The main throttle pulley 43 is connected to the throttle grip of the steering handle 4 (FIG. 1). It is connected via a cable (not shown). That is, the main throttle pulley 43 is rotated according to the amount of rotation of the throttle grip, and the main throttle valve 40 is opened and closed.

  A first contact portion 43 a and a second contact portion 43 b protrude from the main throttle pulley 43 in the radial direction. The main throttle pulley 43 is urged by a spring (not shown) so that the first contact portion 43a is in contact with the idling adjustment portion 44. The idling adjusting portion 44 has the cable 45 inserted through the tube 46, and the knob 70 provided at the rear end thereof is turned so that the male screw of the knob 70 is opposed to the female screw provided on the tube 46 side. The configuration is such that the valve angle can be adjusted in a state in which the main throttle valve 40 is not subjected to the throttle operation by rotating and moving forward and backward in a state where the distal end portion 45a of the cable 45 is in contact with the first contact portion 43a.

  A first link member 48 connected to the sub-throttle shaft 41 is provided above the main throttle pulley 43, and a second link member 49 that swings in conjunction with the first link member 48 is provided. Yes. The adjustment bolt 50 is attached to the second link member 49 so as to face the second contact portion 43b. The throttle body 38 is provided with a sub-throttle motor (actuator) 51 for rotating the sub-throttle shaft 41. The sub-throttle motor 38 is operated based on a command from an ECU (Electric Control Unit) 58 (FIG. 6) described later. Driven by the motor 51, the sub-throttle valve 42 is opened and closed.

  With such a configuration, when the engine 12 is first idle (during cold start), the sub-throttle valve 42 is opened by the sub-throttle motor 51 so that the first link portion 48 and the second link portion 49 swing. Thus, the tip 50a of the adjustment bolt 50 comes into contact with the first contact 43b. Then, the first abutting portion 43b is moved clockwise as viewed from the left side by the pressing force of the adjusting bolt 50, so that the main throttle pulley 43 rotates by a minute angle and the opening required for the first idle in the main throttle valve 40 It is a mechanism that is given.

  FIG. 5 is a right side view of the throttle device 13. As shown in FIG. 5, a main throttle opening sensor 52 for detecting the rotation angle of the main throttle shaft 39 is provided at the right end of the throttle body 38 and the sub-throttle for detecting the rotation angle of the sub-throttle shaft 41. An opening degree sensor 53 is provided.

  FIG. 6 is a block diagram of the engine control apparatus 100 that the motorcycle 1 has. As shown in FIG. 6, the engine control apparatus 100 includes a main switch 56 for turning on / off the main power supply, an ignition switch 57 for starting the engine 12, the crank angle sensor 33, the cam angle sensor 35, and the water temperature. The sensor 26 and the sub-throttle opening sensor 53 are provided, and detection information from these switches and sensors is received by the ECU 58 mounted on the vehicle. The ECU 58 controls the operation of the sub-throttle motor 51 based on the detection information.

  The ECU 58 receives a power supply from a motor drive circuit 59 for driving the sub-throttle motor 51, a control module 60 for controlling the motor drive circuit 59 in cooperation with an MPU (Micro Processing Unit) and a program. An EEPROM 61, which is a non-volatile semiconductor memory capable of storing information without any need, and a RAM 62, which is a volatile semiconductor memory used for temporary storage, are provided.

  The control module 60 is provided with a rotation speed detection unit 63, an engine start detection unit 64, an engine warm-up state detection unit 65, a first idle control unit 66, and an initial opening setting unit 67.

  The rotation speed detector 63 is based on the rotation angle of the crankshaft 18 detected by the crank angle sensor 33 or the rotation angle of a cam (not shown) that reciprocates the exhaust valve 55 detected by the cam angle sensor 35. Based on this, the engine speed (rpm) is calculated.

  When the engine start detecting unit 64 receives that the engine speed is equal to or higher than the specified engine speed from the engine speed detecting unit 63 after the main switch 56 is turned on and the ignition switch 57 is turned on, the engine 12 is started. It has a function to determine that The engine warm-up state detection unit 65 has a function of indirectly detecting the engine temperature based on the coolant temperature received from the water temperature sensor 26 and detecting the warm-up state. The engine temperature may be grasped from an oil temperature sensor (not shown) inside the oil pan 24, or warmed up using a temperature sensor (for example, a thermocouple) that directly detects the temperature of the engine 12. A state may be detected.

  The first idle control unit 66 is connected to the sub-throttle via the motor drive circuit 59 based on detection information from the rotation speed detection unit 63, the engine start detection unit 64, the engine warm-up state detection unit 65, and the sub-throttle opening sensor 53. The motor 51 is driven, and the opening degree of the main throttle valve 40 is adjusted in conjunction with the rotation of the sub-throttle valve 42, so that feedback control is performed so that the engine speed at the time of first idling approaches the target speed.

  When the initial opening degree setting unit 67 is within the allowable range of the target engine speed (the engine speed optimal for the first idle determined based on the temperature detected by the water temperature sensor 26) at the time of the previous first idle. The initial opening degree of the sub-throttle valve 42 at the time of first idling is determined for each start using the opening degree correction amount, and the sub-throttle motor 51 is driven via the motor drive circuit 59 to set the initial opening degree of the sub-throttle valve 42. It has a function to set to. That is, the main throttle valve 40 indirectly corrects the previous opening correction in conjunction with the initial opening setting unit 67 setting the sub throttle valve 42 to the initial opening reflecting the previous opening correction amount. It is set to the initial opening that reflects the amount.

  The RAM 62 has a correction amount temporary storage unit 69, and the opening correction amount of the sub-throttle valve 42 at the time when the feedback control is completed is stored until the main switch 56 is turned off. The EEPROM 61 has a correction amount storage unit 68 so that the opening correction amount stored in the correction amount temporary storage unit 69 after the main switch 56 is turned off is written. The motor drive circuit 59 has a function of driving the sub-throttle motor 51 in accordance with signals from the first idle control unit 66 and the initial opening setting unit 67.

Next, the operation of the engine control apparatus 100 will be described with reference to FIGS. FIG. 7 is a flowchart showing a control procedure of engine control apparatus 100. FIG. 8 is a timing chart for explaining the operation of the engine control apparatus 100. As shown in FIGS. 6 to 8, when the main switch 56 is turned on (step S1), the coolant temperature is detected by the water temperature sensor 26 (step S2), and the first idle control unit 66 responds to the coolant temperature. determining the time _{t 1} and FID retention modes of time _{t 2} of the feedback control mode described later Te (step S3). That is, when the detected water temperature is high, the times t ₁ and t ₂ are shortened, while when the water temperature is low, the times t ₁ and t ₂ are lengthened.

  Next, the initial opening degree setting unit 67 corrects the opening degree with respect to the reference opening degree of the sub-throttle valve 42 when the actual rotation speed of the engine 12 is within the allowable range of the target rotation speed by the feedback control at the time of the previous first idle. The amount is read from the correction amount storage unit 68 of the EEPROM 61. Then, based on the following formula 1, a value obtained by adding the previous opening correction amount to the reference opening is determined as the initial opening at the time of the first idling, and the sub-throttle valve 51 is driven to drive the sub-throttle valve. 42 is set to the initial opening. That is, the initial opening is determined by reflecting the opening correction amount in the previous feedback control and changes every time the engine is started. The reference opening means the opening of the sub-throttle valve 42 at the time of first idling that is fixed in advance at the time of factory shipment.

Initial opening = reference opening + (previous) opening correction amount (Equation 1)
In this way, when the sub-throttle valve 42 is rotated so as to be set to the initial opening reflecting the previous opening correction amount, the first link portion 48 and the second link portion 49 as shown in FIG. Oscillates, the tip 50a of the adjusting bolt 50 contacts the first contact portion 43b, and the main throttle pulley 43 rotates. Thereby, the initial opening degree of the main throttle valve 40 is set so as to be the opening degree of the main throttle valve 40 when the engine speed is within the allowable range of the target speed by the feedback control at the time of the previous first idle. Is done.

  When the engine 12 is started (step S5), as shown in FIG. 8, the fuel injection amount from the injector 47 (FIG. 4) is temporarily increased at the initial start stage to temporarily increase the engine speed to about 2500 rpm. After that, feedback control is performed so that the actual rotational speed of the engine 12 detected by the rotational speed detection unit 63 approaches the target rotational speed. Specifically, it is determined whether or not the absolute value of the difference between the actual rotational speed of the engine 12 and the target rotational speed is smaller than a predetermined dead zone setting value, that is, whether or not the following Expression 2 is satisfied ( Step S6) If the condition of Equation 2 is not satisfied, it is determined that the actual rotational speed of the engine 12 is not within the allowable range of the target rotational speed, and feedback control of the opening correction amount is performed (Step S7). ). On the other hand, when the condition of Expression 2 is satisfied in step S6, it is determined that the actual engine speed is within the allowable range of the target engine speed, and feedback control of the opening correction amount is not performed.

| Target rotational speed-Actual rotational speed | <Dead band setting value (Equation 2)
Then, it is determined whether t ₁ hour from the start of the engine has passed (step S8), and if t ₁ hour has elapsed, the correction amount of RAM62 together with the first idle control unit 66 terminates the feedback control mode The opening correction amount of the sub-throttle valve 42 at the end of the feedback control is stored in the temporary storage unit 69 (step S9). Then, in succession to the feedback control mode shifts the opening correction amount of the sub-throttle valve 42 at the end of the feedback control to the FID hold mode to continue the fast idle state is held t ₂ h (Step S10). When t ₂ hours or more have elapsed from the start of the FID holding mode (step S11), the FID holding mode is terminated and the opening of the main throttle valve 40 is lowered in conjunction with the lowering of the opening of the sub throttle valve 42. Thus, the process shifts to the normal operation mode which is a normal idling state (step S12). As described above, by performing a series of processing from step S1 to step S12, control as shown in the timing chart of FIG. 8 is performed.

  Then, after the desired running operation is performed, the engine 12 is stopped (step S13), and the main switch 56 is turned off (step S14). After the power supply is continued for a predetermined shutdown time, the power is automatically turned on. To turn off. The initial opening setting unit 67 sets the opening correction amount stored in the correction amount temporary storage unit 69 of the RAM 62 to the initial opening at the next first idle while the power supply at the time of shutdown is continued. In order to use it, an operation of saving in the correction amount storage unit 68 of the EEPROM 61 is performed (step S15), and the process is terminated.

With the above configuration, the opening degree of the sub-throttle valve 42 when the actual rotational speed of the engine 12 falls within the allowable range of the target rotational speed by performing feedback control at the time of the first fast idle is determined at the time of the next fast idle. Since the learning function used as the initial opening of the sub-throttle valve 42 is provided, the difference α (see FIG. 8) between the initial opening and the opening at the end of the feedback control is reduced, and the engine speed is set to the target rotation. The time required to approach the number is shortened. Therefore, it is possible to quickly optimize the engine speed at the time of first idling, which contributes to exhaust gas reduction. Also, the feedback control mode time t ₁ and the FID holding mode time t ₂ are shortened when the water temperature detected by the water temperature sensor 26 is high and longer when the water temperature is low. It is possible to shorten the time for maintaining the target rotational speed at a high speed in accordance with the engine temperature, and to reduce exhaust gas.

  In this embodiment, the correction amount of the opening degree of the sub-throttle valve 42 at the end time of the feedback control is stored in the EEPROM 61. However, the opening degree of the sub-throttle valve 42 at the end time of the feedback control is stored in advance. The opening may be used as it is as the next initial opening. That is, instead of Equation 1, the initial opening may be determined using Equation 3 below.

Initial opening = previous opening ... (Formula 3)
In the case of a so-called single throttle valve, the throttle valve opening is directly controlled by the ECU so that it is the opening when the actual rotational speed is within the allowable range of the target rotational speed during the previous first idle. That's fine.

  Moreover, although the motorcycle has been described as an example in the present embodiment, it is needless to say that the present invention can be applied to a personal watercraft (PWC), an uneven terrain vehicle (ATV), and the like.

  As described above, the engine control method and apparatus for a vehicle according to the present invention has an excellent effect of quickly optimizing the engine speed at the time of first idling, and includes a motorcycle and a personal watercraft (Personal Water Craft: Suitable for vehicles such as PWC and rough terrain vehicles (ATV).

1 is a partially cutaway side view of a motorcycle having an engine control apparatus according to an embodiment of the present invention. FIG. 2 is an enlarged view of the engine and its surroundings of the motorcycle shown in FIG. 1. Fig. 2 is a left side view of the throttle device for the motorcycle shown in Fig. 1. FIG. 2 is a schematic cross-sectional view of a main part of the throttle device for the motorcycle shown in FIG. 1. FIG. 2 is a right side view of the throttle device for the motorcycle shown in FIG. 1. FIG. 2 is a block diagram of an engine control device included in the motorcycle shown in FIG. 1. It is a flowchart showing the control procedure of the engine control apparatus shown in FIG. It is a timing chart explaining an effect | action of the engine control apparatus shown in FIG.

Explanation of symbols

1 Motorcycle (vehicle)
12 Engine 13 Throttle device 14 Air cleaner box 26 Water temperature sensor (temperature sensor)
40 Main throttle valve (throttle valve)
42 Sub-throttle valve 51 Sub-throttle motor (actuator)
58 ECU
61 EEPROM
62 RAM
63 Rotational Speed Detection Unit 66 First Idle Control Unit 67 Initial Opening Setting Unit 68 Correction Amount Storage Unit 100 Engine Control Device

Claims (8)

An engine control method for performing feedback control so that the actual engine speed approaches a target engine speed while correcting the opening of a throttle valve that adjusts the intake air flow rate to the engine during first idle,
An engine for a vehicle, wherein the initial opening of the throttle valve at the time of first idling is set to an opening when the actual engine speed falls within an allowable range of the target engine speed at the time of previous first idling. Control method. A rotation speed detection unit for detecting the actual rotation speed of the engine;
During fast idling, feedback control is performed so that the actual rotational speed detected by the rotational speed detection unit approaches the target rotational speed while correcting the opening of the throttle valve that adjusts the intake flow rate to the engine. A first idle control unit;
An initial opening degree setting unit that sets an initial opening degree of the throttle valve at the time of first idling to an opening degree when the actual rotational speed is within the allowable range of the target rotational speed at the time of previous first idling. An engine control device for a vehicle.   The first idle control unit indirectly controls the opening of the throttle valve linked to the sub-throttle valve by controlling the opening of the sub-throttle valve arranged in parallel with the throttle valve in the intake direction. The vehicle engine control device according to claim 2.   The said initial opening setting part has determined what added the last opening correction amount with respect to the predetermined reference opening at the time of a first idle to the said initial opening. Engine control device for vehicles. It is possible to store information without receiving power supply, and includes a correction amount storage unit that stores the opening correction amount of the throttle valve at the end of the feedback control,
The engine control device for a vehicle according to claim 4, wherein the initial opening setting unit determines the initial opening using a previous opening correction amount read from the correction amount storage unit. A temperature sensor for directly or indirectly detecting the temperature of the engine;
The first idle control unit determines a time for controlling the opening degree of the throttle valve based on the temperature detected by the temperature sensor so that the actual rotational speed is within an allowable range of the target rotational speed. The engine control device for a vehicle according to any one of claims 2 to 5.   7. The first idle control unit according to claim 2, wherein the opening degree of the throttle valve is held in a state at a time when the feedback control is ended for a predetermined time after the feedback control is ended. Engine control device for vehicles.   A motorcycle comprising the engine control device according to any one of claims 2 to 7.

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