JP2014190203A - Engine control system of saddle type vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an engine control system of a saddle type vehicle, capable of preventing a driver's unintentional start of the vehicle during a stop of an engine by an idling stop control.SOLUTION: An ECU 20 mounted in a saddle type vehicle having a throttle grip in a handlebar automatically stops an engine 30 when the vehicle satisfies a predetermined running stop condition, and automatically restarts the engine 30 when the throttle grip is operated in the automatic stop state. In addition, the ECU 20 prohibits an automatic restart of the engine 30 when the vehicle is moved in the automatic stop state of the engine 30, and cancels the prohibition of the automatic restart of the engine 30 when the movement of the vehicle is stopped.

Description

  The present invention relates to an engine control device for a straddle-type vehicle equipped with an engine driven by an operation of a throttle grip or the like provided on a handle.

  In a straddle-type vehicle equipped with an engine, the engine is driven by an operation input from a throttle grip or the like provided on a handle. In addition, from the viewpoint of environmental considerations and energy saving, it has been studied to perform idling stop control that suppresses exhaust gas emission and fuel consumption during idling. In the idling stop control, the engine is automatically stopped when the vehicle satisfies a predetermined traveling stop condition, and the engine is automatically restarted by the start instruction by the operation input by the throttle grip from the automatic stop state of the engine. (See Patent Document 1).

Japanese Patent Laid-Open No. 11-257123

  By the way, in a saddle-ride type vehicle driven by a handle operation, the driver may push and move the vehicle while holding the handle by gripping the handle. In this case, the throttle grip is rotated. There is. On the other hand, the state in which the engine is automatically stopped by the idling stop control is difficult to distinguish from the state in which the main power of the vehicle is shut off and the engine is stopped. Therefore, when the driver tries to move the vehicle by hand while the engine is stopped so as to be restartable by the idling stop control, the throttle grip is unexpectedly rotated. May cause unintended vehicle start.

  The main object of the present invention is to provide a straddle-type vehicle engine control device capable of suppressing vehicle start that is not intended by the driver when the engine is stopped by idling stop control.

  According to the first aspect of the present invention, in an engine control device for a straddle-type vehicle having a throttle operation means provided on a handle, the engine is automatically stopped when the vehicle satisfies a predetermined traveling stop condition, and the automatic First control means for automatically restarting the engine when the throttle operation means is operated in a stopped state, movement determination means for determining movement of the vehicle in a state where the engine is automatically stopped, And a second control means for prohibiting the automatic restart of the engine when it is determined by the movement determination means that the vehicle is moving.

  In the above invention, when it is determined that the vehicle is moving while the engine is automatically stopped, automatic restart of the engine is prohibited. Thereby, it is possible to avoid the start of the vehicle not intended by the driver.

The figure which shows the structure which looked at the steering wheel periphery part of the saddle riding type vehicle from the seat side Block diagram showing electrical configuration of engine control system Flow chart of the automatic engine restart prohibiting process Timing chart for control of engine control system

  Hereinafter, an example of an engine control device for a saddle-ride type vehicle according to the present embodiment will be described with reference to the drawings. Note that the saddle riding type vehicle having an idling stop function includes a two-wheeled vehicle such as a scooter and a three-wheeled vehicle such as a buggy. Here, a scooter will be described as an example.

  In FIG. 1, a vehicle body front portion 11 of a two-wheeled vehicle 10 (hereinafter also simply referred to as a vehicle 10) is provided with a right handle 12 and a left handle 13, and the right handle 12 has a throttle grip as a throttle operating means. 14 is provided. The opening degree of the throttle valve provided in the intake passage of the engine 30 is adjusted by the turning operation of the throttle grip 14. The right handle 12 is provided with a front-wheel brake lever 15 for operating the front wheel brake (front brake), and the left handle 13 is operated with the rear wheel brake (rear brake). For this purpose, a brake lever 16 for the rear wheel is provided. A display unit 21 is provided on the upper surface side of the vehicle body front portion 11. The display unit 21 is provided with a vehicle speed meter, a fuel gauge, a lamp for displaying the driving state of the vehicle, and the like.

  2, the engine 30 mounted on the vehicle 10 includes an injector 31 as fuel injection means and an ignition device 32 (ignition coil, spark plug, etc.) as ignition means. The injector 31 is used to supply fuel to a combustion chamber (not shown) of the engine 30. The ignition device 32 is used for igniting and burning the air-fuel mixture supplied to the combustion chamber of the engine 30. Further, the vehicle 10 is provided with a starter 34 as a starting device that applies an initial rotation (cranking rotation) to the engine 30 when the engine is started.

  The ECU 20 is an electronic control unit including a known microcomputer. The ECU 20 detects the amount of operation of a vehicle speed sensor 35 that detects the speed (vehicle speed) of the vehicle 10, a throttle opening sensor 36 that detects the opening of a throttle valve (not shown), and the brake lever 15 for the front wheels. A front brake sensor 37, a rear brake sensor 38 that detects the amount of operation of the brake lever 16 for the rear wheel, and a seating sensor 39 that detects the seating of the driver on a seat seat (not shown) are connected. The ECU 20 performs various engine controls such as fuel injection control by the injector 31 and ignition control by the ignition device 32 and drive control of the starter 34 based on detection results of these various sensors.

  The vehicle speed sensor 35 detects, for example, the rotational speed (rotational speed) of the axle and generates a pulse signal proportional to the rotational speed. The ECU 20 calculates the moving speed of the vehicle 10 based on the pulse signal output from the vehicle speed sensor 35. The seating sensor 39 is composed of, for example, a well-known pressure sensor or the like, and detects whether or not the driver is seated on the seat seat based on pressure fluctuation applied to the seat seat. The ECU 20 performs various operation controls based on signals sequentially input from these sensors 35 to 39.

  The ECU 20 performs idling stop control of the engine 30 as the first control means. In the idling stop control, the engine 30 is automatically stopped when the vehicle 10 satisfies a predetermined traveling stop condition. In the idling stop control, for example, the engine 30 is automatically stopped at a timing when a predetermined standby time T0 (for example, 3 seconds) has elapsed since the traveling of the vehicle 10 stopped. Thereafter, when a predetermined restart condition is satisfied, such as when a throttle operation is performed, the starter 34 is driven to automatically restart the engine 30. By such idling stop control, the effect of improving fuel consumption and reducing exhaust gas can be obtained.

  Further, the ECU 20 determines whether or not the vehicle 10 is moving based on the detection result of the moving speed by the vehicle speed sensor 35 in a state where the engine 30 is automatically stopped as the movement determining means. Further, as the second control means, when it is determined that the vehicle 10 is moving while the engine 30 is automatically stopped by the idling stop control, the engine 30 is prohibited from being automatically restarted, and the engine 30 is Maintain the automatic stop state. Further, as a seating determination means, it is determined whether or not the driver is seated on the vehicle 10 based on the detection result of the seating sensor 39.

  That is, after the vehicle 10 travels, the driver may get out of the seat, support the handle 12 and move the vehicle 10 by hand, and the throttle grip 14 may be rotated at this time. For example, when the direction of the vehicle 10 is changed or the vehicle 10 is tilted, the throttle grip 14 may be rotated.

  On the other hand, the state in which the engine 30 is automatically stopped by the idling stop control is difficult to distinguish from the state in which the main power of the vehicle 10 is shut off and the engine 30 is stopped (power key OFF state). Therefore, when the driver tries to move the vehicle 10 by hand while the engine 30 is stopped so as to be restartable by the idling stop control, the throttle grip 14 may be unexpectedly rotated. This may cause the vehicle to start unintended by the driver. Therefore, in the present embodiment, when it is determined that the vehicle 10 is moving when the engine 30 is automatically stopped, the automatic restart of the engine 30 is prohibited and the automatic stop state is maintained. Like that.

  Next, a procedure of processing executed by the ECU 20 is shown. It is assumed that the following processing by the ECU 20 is repeatedly executed by the ECU 20 at a predetermined cycle.

  In the present embodiment, it is assumed that whether or not automatic restart of the engine 30 is permitted is set by a restart prohibition flag. That is, in a normal case (when the vehicle travels), the restart prohibition flag is OFF. If the restart prohibition flag remains OFF after the engine 30 is automatically stopped, automatic restart is permitted. On the other hand, after the engine 30 is automatically stopped, if the restart prohibition flag is turned ON due to the movement of the vehicle 10 by hand, the engine 30 is prohibited from being automatically restarted.

  In FIG. 3, in step S10, it is determined whether or not the engine 30 is in operation. In this case, if the vehicle is in operation, an affirmative determination is made in step S10, and if the automatic stop is being performed, a negative determination is made in step S10. If a positive determination is made here, the process proceeds to step S11.

  In step S11, it is determined whether or not the vehicle 10 is in a travel stop state. If it is determined that the vehicle 10 is in the travel stop state, the process proceeds to step S12. When it is determined that the vehicle 10 is not in the travel stop state, this process is terminated. For example, when the vehicle speed is zero, it is determined that the traveling of the vehicle 10 is stopped.

  In subsequent step S12, an elapsed time TX after it is determined that the vehicle 10 is in the travel stop state is measured, and it is determined whether or not the elapsed time TX has reached the standby time T0. If a positive determination is made, the process proceeds to step S13. If a negative determination is made, this process ends.

  In step S13, assuming that the automatic stop condition is satisfied, the engine 30 is automatically stopped. Specifically, the engine 30 is stopped by stopping the outputs of the fuel injection command to the injector 31 and the ignition command to the ignition device 32, respectively.

  On the other hand, when it is determined in step S10 that the engine 30 is automatically stopped, the process proceeds to step S14, and it is determined whether or not the restart prohibition flag is OFF. If an affirmative determination is made that the restart prohibition flag is OFF, the process proceeds to step S15 to determine whether or not the vehicle is moving. For example, when the moving speed of the vehicle 10 is equal to or higher than the set value v1, it is determined that the vehicle is moving. When it affirmation determinates that the vehicle 10 is moving, it progresses to step S16. For example, the set value v1 is set to 3 km / h in consideration of human walking speed.

  If a negative determination is made in step S15, it is determined in step S18 whether or not there is an operation input of the throttle grip 14 (whether or not the throttle valve is open). If there is an operation input and an affirmative decision is made, the operation proceeds to step S19. If a negative determination is made, this process ends. In step S19, it is considered that the restart condition of the engine 30 is satisfied, and the automatic restart by the starter 34 is performed. As a result, the vehicle 10 can be started.

  On the other hand, if an affirmative determination is made in step S15, it is determined in step S16 whether or not the seating sensor 39 is OFF. If the affirmative determination is made that the seating sensor 39 is OFF, the process proceeds to step S17, and the restart prohibition flag is set to ON. On the other hand, if a negative determination is made, this process is terminated. That is, if a negative determination is made in step S16, the restart prohibition flag remains OFF. As a specific example in which a negative determination is made in step S16, when the engine 30 is automatically stopped by the idling stop control, the driver sits on a seat seat, kicks the ground with his foot, and moves with the vehicle 10 Etc. In the subsequent step S17, the restart prohibition flag is set to ON.

  If it is determined in step S14 that the restart prohibition flag is ON, it is determined in step S20 whether a restart prohibition release condition is satisfied. In the present embodiment, when the movement of the vehicle 10 stops, it is determined that the release prohibition condition for restart is satisfied. At this time, if the vehicle speed = 0, it is determined that the movement of the vehicle 10 has stopped. Note that the vehicle speed determination criterion in step S20 may be the same as in step S15. Alternatively, the configuration may be such that step S20 is positively determined when a predetermined time (for example, 1 second) has elapsed after the movement of the vehicle 10 is stopped (after the vehicle speed becomes 0). If it is determined that the vehicle 10 is moving, this process is terminated. On the other hand, if it is determined that the vehicle 10 is not moving, the process proceeds to step S21 and the restart prohibition flag is turned OFF.

  Next, FIG. 4 shows an execution example of the above process. Prior to time t1, the vehicle 10 is traveling on the road, the restart prohibition flag is OFF, the seating sensor 39 is ON, and the throttle valve 14 is opened by the operation input of the throttle grip 14 according to the opening degree of the throttle valve. The engine 30 is operating.

  When the driver releases the operation of the throttle grip 14 at time t1, the speed of the vehicle 10 decreases with time. When the speed of the vehicle 10 becomes zero at time t2, it is determined that the vehicle 10 satisfies a predetermined traveling stop condition (is in a stopped state), and measurement of the elapsed time TX is started. When it is detected that the elapsed time TX has reached the standby time T0 at time t3, the engine 30 is automatically stopped.

  When the driver gets out of the vehicle 10 at time t4, the seating sensor 39 is turned off. Thereafter, when the driver starts the operation of supporting the handle 12 and pushing the vehicle 10 to move, the vehicle speed sensor 35 detects the moving speed of the vehicle 10. At time t5, when it is detected that the moving speed is equal to or higher than the set value v1, the restart prohibition flag is turned ON.

  After the time t5, when the driver further pushes and moves the vehicle 10, even if the throttle grip 14 is opened at the time t6, the restart prohibition flag is ON, so the engine 30 is kept stopped.

  When the movement of the vehicle 10 by the driver's hand is stopped and the vehicle speed becomes zero at time t7, the restart prohibition flag is turned OFF.

  At time t8, when the driver sits on the vehicle 10 in order to drive the vehicle 10, the seating sensor 39 is turned on. When the throttle grip 14 is rotated (operated) at time t9, the engine 30 is automatically restarted according to the rotation amount (the opening degree of the throttle valve).

According to the above, the following excellent effects can be obtained.
(1) When the driver supports the steering wheel 12 and moves the vehicle 10 by hand when the engine 30 is in the automatic stop state, automatic restart is prohibited and the engine is operated even if the throttle grip 14 is operated. 30 was left in the automatic stop state. As a result, it is possible to avoid the vehicle starting unintended by the driver.

  (2) After the movement of the vehicle 10 is stopped by the driver's hand, the vehicle travel may start. Therefore, when it is determined that the movement of the vehicle 10 has stopped, the prohibition of the automatic restart of the engine 30 is canceled, and the subsequent vehicle start is smoothly performed.

  (3) When the driver is seated while the engine 30 is automatically stopped, it is relatively likely that the driver intends to travel the vehicle. When the driver is not seated, the vehicle travels. It is relatively unlikely that there is an intention. Therefore, when it is determined that the driver is seated, the automatic restart of the engine 30 is excessively prohibited by prohibiting the automatic restart of the engine 30 and, consequently, the start of the driver. It is possible to suppress inconvenience that the intention is not reflected.

  (4) When the driver is seated, the vehicle may start traveling. Therefore, when it is determined that the driver is seated from the state where the driver is not seated and the automatic restart of the engine 30 is prohibited, the prohibition of the automatic restart of the engine 30 is canceled. The subsequent vehicle start can be started smoothly.

  (5) When the moving speed of the vehicle 10 is increased by the driver pressing the vehicle strongly, the possibility that the throttle grip 14 is operated becomes relatively high. On the other hand, there is a possibility that the vehicle starts moving after the driver moves the vehicle by hand. Therefore, when the moving speed of the vehicle 10 is equal to or higher than the set value and the possibility of starting the vehicle is high, the restart prohibition flag is set to ON to prohibit the automatic restart of the engine 30. On the other hand, when the moving speed of the vehicle 10 is less than the set value and the possibility that the throttle grip 14 is operated is relatively low, the restart prohibition flag is turned OFF, and the engine 30 can be automatically restarted. . If it does in this way, the vehicle start performed after that will be started more smoothly, avoiding the vehicle start which is not intended.

  Another example will be described below.

  In step 20 of FIG. 3, it may be configured that the restart prohibition release condition is satisfied when it is determined that the seating sensor 39 is ON. In this case, the restart prohibition flag is canceled when it is determined that the seating sensor 39 is ON. In this case as well, the vehicle starts smoothly when the vehicle 10 gets on the vehicle 10 where the driver intends to drive the vehicle while avoiding the unintended vehicle start.

  In step S11 of FIG. 3, it may be determined that the travel stop condition is satisfied while the travel speed of the vehicle is greater than zero. For example, it may be determined that the travel stop condition is satisfied when the vehicle speed is 1.5 km / h or less.

  -You may make it alert | report by the lamp display of the display part 21 that the restart prohibition flag is ON and the automatic restart of the engine 30 is prohibited. The display unit 21 corresponds to a notification unit, and may be configured to perform voice notification using a speaker in addition to lamp display notification.

  -The driver's seating may be detected optically with an infrared sensor or the like. Alternatively, the seating of the driver may be determined based on an operation input from a member (for example, a brake or the like) that is operated while the driver is seated on the vehicle 10. Further, without providing the seating sensor 39 in the vehicle 10, whether or not to prohibit the automatic restart of the engine 30 may be determined based on the detection result such as the moving speed. In this case, unintended vehicle start can be avoided while simplifying the configuration of the vehicle 10.

  The release prohibition flag release (OFF) in step S21 may be manually performed by an operation input of a switch (not shown) provided in the display unit 21. For example, even if a condition for turning on the restart prohibition flag is satisfied, if there is a switch operation input, the restart prohibition flag is returned to OFF. This makes it possible to start the vehicle more smoothly when the driver intends to travel the vehicle.

  DESCRIPTION OF SYMBOLS 10 ... Vehicle, 12 ... Handle, 14 ... Throttle grip, 20 ... ECU, 30 ... Engine.

Claims (5)

In the engine control device for a saddle-ride type vehicle (10) in which a throttle operation means (14) is provided on the handle (12),
First control means for automatically stopping the engine (30) when the vehicle satisfies a predetermined travel stop condition, and for automatically restarting the engine when the throttle operation means is operated in the automatic stop state ( 20)
Movement determination means (20) for determining movement of the vehicle in a state where the engine is automatically stopped;
A straddle-type vehicle comprising: second control means (20) for prohibiting automatic restart of the engine when the movement determination means determines that the vehicle is moving. Engine control device.   2. The straddle-type vehicle according to claim 1, wherein the second control unit releases the prohibition of the automatic restart of the engine based on the determination that the movement of the vehicle is stopped by the movement determination unit. Engine control device. Seating determination means (20) for determining whether or not the driver is seated in the vehicle,
The second control means, if it is determined that the vehicle is moving by the movement determination means, and if the driver is determined to be seated by the seating determination means, The engine control device for a straddle-type vehicle according to any one of claims 1 to 2, wherein automatic restart is not prohibited. Comprising seating determination means (20) for determining whether or not the driver is seated in the vehicle;
The second control means is configured such that when the movement determination means determines that the vehicle is moving, the second control means determines whether the driver is not seated by the seating determination means. The saddle riding type vehicle according to claim 1, wherein the automatic restart is prohibited, and then the automatic restart prohibition is canceled based on the determination that the driver is seated by the seating determination means. Engine control device.   The straddle-type vehicle engine control device according to any one of claims 1 to 4, wherein the movement determination means determines that the vehicle is moving when the moving speed of the vehicle is equal to or higher than a predetermined value.

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