JP2010013076A - Turnover determining device for engine travelling vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a turnover determining device for detecting the turnover of a vehicle. <P>SOLUTION: The turnover determining device for an engine travelling vehicle includes: an engine 1 for driving the vehicle; a lubricating oil supply means 2 for supplying lubricating oil to a sliding portion of the engine; a hydraulic sensor 3 for detecting the hydraulic pressure of the lubricating oil to be supplied; and a turnover determining means for determining the turnover of the vehicle when a held portion of the lubricating oil held in an engine room is changed with the turnover of the vehicle and the hydraulic pressure detected by the hydraulic sensor is changed therewith. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a fall determination device that detects a fall of a vehicle.

Conventionally, in order to detect a fall while the motorcycle is running, the motorcycle is equipped with a fall sensor that detects the fall of the vehicle body. And a fall was detected by the fall sensor, and the fuel pump, injector, ignition device, etc. of the motorcycle were stopped. Patent Document 1 proposes that an acceleration sensor and a speed detection device attached to a motorcycle detect the risk of the motorcycle falling and warn the driver automatically. Further, Patent Document 2 proposes detecting a fall of a vehicle body by a motorcycle fall detection device using an acceleration sensor as a fall sensor. Then, the fall sensor or the like determines the fall, and the driver is stopped and the fuel pump, the injector, the ignition device, and the like are stopped.
JP-A-9-109967 JP 2004-93537 A

  Since the fall sensor is installed in a space under the seat of the vehicle body, it is necessary to secure and install the installation space for the fall sensor, which is expensive in terms of manufacturing and work.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an overturn determination device for an engine traveling vehicle that can detect the overturn of a vehicle without employing a overturn sensor, is easy to work, and is inexpensive.

  In order to solve the above problems, the present inventor has repeatedly studied about a method of detecting a fall without using a fall sensor, and has come to realize that a fall determination can be made based on the hydraulic pressure detected by the hydraulic sensor, The present invention has been completed.

  That is, an engine running vehicle overturn determination device according to the present invention includes an engine that drives the vehicle, lubricating oil supply means that supplies lubricating oil held in an engine room of the engine to a sliding portion of the engine, A hydraulic sensor that detects the hydraulic pressure of the lubricating oil supplied by the lubricating oil supply means, and a holding portion of the lubricating oil that is held in the engine room when the vehicle overturns, and is thereby detected by the hydraulic sensor. And a fall judging means for judging whether the vehicle falls due to a change in hydraulic pressure.

  The overturn determination device for an engine traveling vehicle according to the present invention detects the oil pressure of the lubricating oil by a hydraulic sensor, and determines whether the vehicle is overturned by the overturn determination means. Therefore, it is not necessary to install a fall sensor, the cost can be reduced, and the fall of the vehicle can be determined. That is, when the vehicle falls, the lubricating oil moves to and accumulates at other positions in the engine room due to gravity, so that the hydraulic pressure (value) detected by the hydraulic sensor changes, and it is possible to determine whether the engine traveling vehicle has fallen.

  The overturn determination device for an engine traveling vehicle according to the present invention includes a lubricating oil supply unit, a hydraulic pressure sensor, and a overturn determination unit that determines overturn of the vehicle.

  The lubricating oil supply means has a function of supplying the lubricating oil held in the engine room of the engine to the sliding portion. The lubricating oil supply means can be, for example, a portion having a crank that rotates in the engine room. When the engine is started, the portion having the crank rotates, and the tip portion of the crank scoops up the surface portion of the lubricating oil held in the engine room. The scooped-up lubricating oil scatters into the engine room, is supplied to the sliding portion of the engine, and then moves downward due to gravity, and returns to the bottom of the engine room and is held again.

  As another example, the lubricating oil supply means has an introduction opening that opens into the lubricating oil retained and retained in the engine room, and a pump that supplies the lubricating oil introduced from the introduction opening to the sliding portion. It can be. Lubricating oil is pumped up by a pump, and the lubricating oil is supplied to a target sliding portion by the hydraulic pressure of the pump. The lubricating oil returns from the sliding portion to the bottom of the engine room and is retained. The lubricating oil supply means has an inlet opening that opens above the level of the lubricating oil retained and retained in the engine room, and receives the lubricating oil scraped up by a rotating crank or the like. The lubricating oil can be supplied by a drop between the opening and the liquid level of the lubricating oil retained and retained.

  The lubricating oil supplied to the sliding part of the engine reduces the frictional resistance, and acts to cool and maintain the airtightness of the combustion chamber. The lubricating oil is returned from the sliding portion into the engine room again, and the lubricating oil circulates repeatedly. Examples of the sliding portion of the engine include a crankshaft, a cam, a cylinder, a piston, and a piston ring.

  The oil pressure sensor detects the oil pressure of the lubricating oil. As the oil pressure sensor, an oil amount sensor used for measuring the amount of lubricating oil retained and retained in the engine room can be used. When the vehicle falls, the location where the lubricating oil stays in the engine room changes, and the amount of oil varies greatly. This fluctuation is detected as a hydraulic pressure (value) and is used for the determination of falling.

  The oil pressure sensor may be introduced from the introduction opening and detect the oil pressure of the lubricating oil flowing through the lubrication path. Since the lubricating oil is sent to the sliding portion of the engine, the lubricating oil flowing through the lubricating path has a certain hydraulic pressure when the engine is rotating. The oil pressure sensor detects the oil pressure at a predetermined portion in the lubrication path, and the detected oil pressure is transmitted to the ECU and the meter. When the vehicle falls, the holding portion of the lubricating oil changes, and the lubricating oil is not supplied to the introduction opening of the lubricating oil supply means. For this reason, the hydraulic pressure of the lubricating oil flowing to the lubricating oil supply means decreases, and a change in the hydraulic pressure can be detected by the hydraulic pressure sensor.

  The overturn determining means determines whether the vehicle is overturned from a decrease in hydraulic pressure detected by the hydraulic sensor. It is preferable that the fall determination means determines based on a plurality of hydraulic pressures detected at intervals. The change in the hydraulic pressure may change due to factors other than the vehicle falling down, and the falling is more reliably determined.

  Furthermore, it has a temperature sensor which measures the temperature of an engine directly or indirectly, and a fall determination means shall determine fall based on the engine temperature detected by the temperature sensor. By using a temperature sensor that measures the temperature of the engine, the ECU can grasp the state of the engine, and by determining the measurement interval time based on the engine temperature, it is possible to measure a plurality of oil pressures by the hydraulic sensor. Judgment accuracy is improved, and malfunction can be prevented even when the vehicle body is tilted to turn a curve.

  Hereinafter, the present invention will be described using examples.

  An engine running vehicle overturn judging device according to an embodiment of the present invention is assembled in a motorcycle whose side view is shown in FIG. This overturn determination device includes an engine 1 whose cross-sectional schematic diagram is shown in FIG. 2, a crank web 2 that constitutes the lubricating oil supply means of the present invention, a hydraulic sensor 3, and an ECU 4 that constitutes the overturn determination means. The engine includes a housing 5 having a cylinder chamber 51 and a crank chamber 52, a piston 11 slidably held in the cylinder chamber 51, a crankshaft 12 rotatably held in the housing 5, and a crankshaft 12 The crank web 2 is formed by integrating a crank arm and a balance weight that are integrally fixed to each other, a connecting rod 13 that connects the piston 11 and the crank web 2, and a hydraulic sensor 3. The lower part of the crank chamber 52 of the housing 5 of the engine 1 serves as a lubricating oil reservoir, and the engine oil 6 is retained and retained.

  This motorcycle has a power source (not shown) and a meter 7 shown in FIG. The engine 1 includes a power source, a crank angle sensor, a throttle sensor, a water temperature sensor, a fuel pump, an injector, an ignition device, a fuel level sensor, and a vehicle speed sensor (not shown).

  As shown in the block diagram of FIG. 3, the ECU 4 receives inputs from a power source, a crank angle sensor, a throttle sensor, a water temperature sensor, and a hydraulic pressure sensor 3, processes signals, and outputs them to a fuel pump, an injector, and an ignition device. At the same time, a rotation speed signal is output to the meter 6. The ECU 4 includes a control program for executing the operation flow shown in FIG. In this embodiment, the ECU 4 having the control program for executing the operation flow shown in FIG. 4 has the structural features of the embodiment of the present invention, and the other parts and the structure of the engine 1 itself are the same as those of the conventional one. It is.

  The ECU 4 includes a CPU (Central Processing Unit), ROM, and RAM (not shown), and executes the control program according to the flowchart shown in FIG. The ECU 4 performs a fall determination process, a data storage process, and the like based on the hydraulic pressure detected by the hydraulic sensor 3 during execution of the control program. The ECU 4 is always supplied with power from an electric power source and is in an operating state, and starts execution of the control program when an ignition switch (not shown) of the motorcycle is turned on. The control program is stored in advance in the ROM of the ECU 4.

  The ECU 4 calculates the fuel injection amount according to the state of the engine based on the input signals from the respective sensors shown in FIG. 3, and controls the injection time of the injector according to the fuel injection amount.

  The power source is a battery such as a lead storage battery that is a kind of secondary battery, or an alternator that is a generator. The crank angle sensor is a sensor for knowing the rotation angle of the crankshaft. The throttle sensor is used for detecting the opening of the throttle valve and performing injection amount control according to the throttle opening. The water temperature sensor is a sensor for measuring the temperature of engine cooling water. Usually installed in the engine coolant passage.

  The fuel pump is a pump that sucks up fuel in a fuel tank (not shown) and supplies the fuel to an injector. An injector is also called a fuel injection device, and is a device that injects fuel supplied from a fuel pump into a combustion chamber of an engine. The ignition device generates an electric spark by a spark plug (not shown). It ignites the compressed mixture and causes an explosion.

  The rotational speed signal (octopus signal) (shown in FIG. 3) is processed by the ECU 4 based on the signal from the crank angle sensor and transmitted to the meter 7 as the engine speed.

  As shown in FIG. 2, the hydraulic pressure sensor 3 is provided at the bottom of the crank room 52 and detects the hydraulic pressure of the engine oil 6. When the motorcycle is upright, the engine oil 6 is accumulated in an oil pan, which is a holding portion of the lubricating oil below in the crank room 52, and is rotated when the engine 1 is started. A portion near the liquid level of the engine oil 6 in which the crank web 2 is accumulated is scraped up, and the engine oil thus scattered is scattered in the crank room 52 to supply the engine oil to the sliding portion of the engine. Engine oil has the effect of reducing frictional resistance, cooling and preventing rust.

  The detection of the hydraulic pressure is started when the ignition switch is turned on and the engine 1 is started. FIG. 5 shows a relationship diagram between the engine speed and the detected hydraulic pressure. When the engine speed that is rotating at a low speed is low, such as before the engine 1 is started or in an idling state, the hydraulic oil is less scraped up by the crank web 2 and the engine oil stored in the oil pan is stored in the oil pan. The amount is large and the oil pressure (value) detected by the oil pressure sensor 3 also increases. When the engine speed increases, the engine oil scraped up by the crank web 2 increases, the engine oil 6 stored in the oil pan decreases, the pressure applied to the hydraulic sensor 3 decreases, and the hydraulic pressure decreases. In this engine 1, when the engine speed reaches a predetermined value or higher, the engine pressure is adjusted so as not to increase to prevent engine overspeed, so the hydraulic pressure is adjusted to be kept constant.

  The fuel level sensor is a sensor that detects the amount of fuel contained in the fuel tank, and the vehicle speed sensor is a sensor that detects the traveling speed. The meter 7 displays a speedometer that displays the traveling speed, an engine speed, a fuel gauge, a hydraulic pressure warning light, and the like.

  When the motorcycle according to this embodiment falls, the engine 1 also falls as shown in FIG. Due to this overturning, the engine oil 6 in the crankroom 52 also moves downward at the overturned position and is stored at the position shown in FIG. In this state, the engine oil 6 does not press the hydraulic pressure sensor 3. For this reason, the oil pressure (value) of the oil pressure sensor decreases. The ECU 4 determines the overturn of the motorcycle based on the reduced hydraulic pressure (value). If it is determined that the motorcycle has fallen, the ECU 4 stops the fuel pump, the injector and the ignition device, and uses a warning light mounted on the meter 7 to To inform.

  FIG. 7 shows an example of the hydraulic pressure when the motorcycle is traveling normally and when it falls. Since the engine oil 6 does not act on the oil pressure sensor 3 and the weight of the engine oil 6 does not act, the oil pressure is greatly reduced. Therefore, the ECU 4 can determine that this large decrease is a fall of the motorcycle.

  The fall determination by the fall determination device of the present embodiment will be described in detail below with reference to FIG. 4 which is a flowchart of the present embodiment.

  When the ignition switch is turned on and the engine 1 is started, the program stored in the ROM of the ECU 4 is read. First, at step 100, the counter t is initialized and set as t = 0. Next, at step 110, the oil pressure is detected from the oil pressure sensor 3, the engine speed is detected from the signal of the crank angle sensor, the temperature of the cooling water is detected from the water temperature sensor, and is temporarily stored.

  Next, at step 120, a predetermined value A is calculated from the engine speed. As shown in FIG. 8 (a), 1 is decremented from the predetermined value A every time the engine speed increases from the predetermined value A based on the engine speed of 1000. For example, when the engine speed is 2000, 1 is reduced from the predetermined value A. When the engine speed further increases to 3000 rpm, 1 is further reduced. When the engine speed is 3000 rpm, the predetermined value A is a value of A-2 compared to 1000 rpm. That is, every time the engine speed increases, 1 is decreased and the predetermined value A is determined.

  Then, the predetermined value A and the hydraulic pressure are compared and determined. When the motorcycle is overturned, the engine 1 falls sideways as shown in FIG. 6, so that the holding portion of the engine oil 6 changes from the lower side of the engine 1 to the horizontal position, and the engine oil 6 It accumulates in a horizontal position by the action. Then, the weight of the engine oil 6 does not act on the hydraulic pressure sensor 3, and the hydraulic pressure decreases. In this embodiment, as shown in FIG. 8B, the hydraulic pressure at the time of falling is set lower than a predetermined value A. When the hydraulic pressure is less than or equal to the predetermined value A, the determination at step 120 is true and the routine proceeds to step 130.

  When the motorcycle is not overturned, it is determined that the motorcycle is not overturned because the hydraulic pressure is higher than the predetermined value A. In that case, go to RETURN. By making a determination based on a predetermined value calculated from the hydraulic pressure and the engine speed, it is possible to grasp whether the state of the motorcycle is in operation, and thus the accuracy of the fall determination can be improved.

  If the determination in step 120 is true, a predetermined value B is calculated from the engine coolant temperature in step 130. As shown in FIG. 9A, the predetermined value B is determined by increasing the numerical value to the predetermined value B every time the coolant temperature of the engine cooling water decreases. For example, when the engine coolant temperature is 80 ° C., 1 is increased to a predetermined value B based on 100 ° C. When the water temperature further drops to 60 ° C., 1 is further increased. When the temperature of the engine cooling water is 60 ° C., the predetermined value B is a value of B + 2 compared to when the engine cooling water is 100 ° C. That is, as shown in FIG. 9B, the predetermined value B is determined by increasing 1 to the predetermined value B by the temperature lowered from the reference engine coolant temperature. When the water temperature is low, the motorcycle is warming up or idling, etc. By setting the predetermined value B higher, multiple measured values will be acquired, causing a malfunction of the overturn determination Can be prevented.

  When it is determined that the counter t is not equal to or greater than the predetermined value B, in step 140, the period t is added to the counter t, and the value of the counter t is increased. Then, step 110 to step 140 are repeated.

  When it is determined that the counter t is equal to or greater than the predetermined value B, it is determined that the motorcycle has fallen, and in step 150, the fuel pump, the injector, and the ignition device are stopped by a command from the ECU 4. By detecting the coolant temperature of the engine cooling water, the state of the motorcycle can be grasped, and the measurement interval time is provided, so that the accuracy of the overturn determination of the motorcycle can be improved and malfunction can be prevented.

  The present invention is not limited to the above-described embodiments, and it goes without saying that various modifications can be made without departing from the spirit of the present invention. For example, although the engine speed is based on 1000 rpm, it is preferable to change the reference engine speed depending on the displacement and configuration of the engine 1. In detecting the hydraulic pressure, a plurality of hydraulic pressures may be detected to obtain an average value of the hydraulic pressures and compared with a predetermined value A. By obtaining the average value of the hydraulic pressure, variations can be eliminated and the accuracy of the overturn determination can be increased.

  Further, as the lubricating oil supply means, an engine pump that pumps engine oil to the sliding portion may be used. Further, as in this embodiment, the splash lubrication method is used, and the scraped lubricating oil is received by the upper part of the crank chamber, and the received part and the normal (not overturned) stored lubrication. Lubricating oil may be supplied to the sliding portion of the engine using a pressure based on the height of the oil level.

1 is a side view of a motorcycle including a fall determination device according to an embodiment. 1 is a schematic cross-sectional view of an engine when a motorcycle is not overturned. It is a block diagram which shows the fall determination means of an Example. It is a figure which shows the operation | movement flow of an Example. It is a figure which shows the relationship between the hydraulic pressure of an Example, and an engine speed. 1 is a schematic cross-sectional view of an engine when a motorcycle according to an embodiment falls. It is a figure which shows the relationship between the oil_pressure | hydraulic and engine speed when the motorcycle of an Example falls. The relationship between the engine speed of an Example and the predetermined value A is shown, (a) shows the table | surface, (b) shows a diagram. The relationship between the engine coolant temperature of the embodiment and the predetermined value B is shown, (a) shows the table, and (b) shows the diagram.

Explanation of symbols

1: Engine 2: Crank web 3: Hydraulic sensor 4: ECU
5: Housing 6: Engine oil 7: Meter

Claims (7)

An engine that drives the vehicle;
Lubricating oil supply means for supplying the lubricating oil retained in the engine room of the engine to the sliding portion of the engine;
A hydraulic pressure sensor for detecting the hydraulic pressure of the lubricating oil supplied by the lubricating oil supply means;
An overturn determination means for determining the overturn of the vehicle by the change in the hydraulic pressure detected by the hydraulic pressure sensor by changing the holding portion of the lubricating oil held in the engine room due to the overturn of the vehicle,
An overturn determination device for an engine traveling vehicle characterized by comprising:   The lubricating oil supply means includes a portion having a crank that rotates in the engine room, and supplies the lubricating oil to the sliding portion by scraping up the lubricating oil held by the portion having the crank. The overturn determination device for an engine traveling vehicle according to claim 1, wherein the hydraulic pressure sensor is provided in a lubricating oil holding portion.   2. The lubricating oil supply means includes an introduction opening that opens into the lubricating oil retained and retained in the engine room, and a pump that supplies lubricating oil introduced from the introduction opening to the sliding portion. An overturn determination device for an engine traveling vehicle according to claim 1.   The lubricating oil supply means has an introduction opening that opens above the liquid level of the lubricating oil retained and retained in the engine room, and supplies the lubricating oil by a drop between the introduction opening and the liquid level of the lubricating oil. The overturn determination device for an engine traveling vehicle according to claim 1.   The overturn determination device for an engine traveling vehicle according to claim 1, wherein the overturn determination means makes a determination based on a plurality of hydraulic pressures detected over time. In addition, it has a temperature sensor that directly or indirectly measures the temperature of the engine,
The said fall determination means determines the frequency | count of the measured value measured by the hydraulic sensor which determines a fall based on the engine temperature detected by this temperature sensor, and / or the measurement interval time of two measured values. The fall determination apparatus of the engine traveling vehicle as described.   The overturn determination device for an engine traveling vehicle according to claim 6, wherein the engine temperature is a temperature of engine cooling water.

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