JP2010174927A - Idling stop system - Google Patents

Abstract

The present invention provides an idle stop system capable of maintaining the start shift position without using an electric oil pump, reducing the cost of the entire system, and further improving fuel efficiency.
In an idle stop system in which an internal combustion engine of a vehicle is automatically stopped and started when the vehicle is stopped or started, an oil supply unit 6 having a start clutch C1 and hydraulic oil in the oil supply unit 6 are provided. Switching means 5 for communicating or shutting off, two mechanical oil pumps 2 and 3 driven by the driving force of the internal combustion engine 1, and engagement for connecting or releasing the two mechanical oil pumps 2 and 3 An idle stop characterized in that one of the two mechanical oil pumps 2 and 3 is connected to the switching means 5 and the other is connected only to the starting clutch C1. system.
[Selection] Figure 1

Description

  The present invention relates to an idle stop system that automatically stops and automatically starts an internal combustion engine of a vehicle when the vehicle is stopped or started due to a signal or the like.

  Conventionally, for the purpose of improving fuel efficiency when driving in urban areas with a high stopping rate, when the vehicle is stopped under predetermined conditions such as waiting for a signal, the fuel supply to the combustion chamber of the internal combustion engine is stopped, and the internal combustion engine An idle stop system that automatically stops the engine and restarts the internal combustion engine when the vehicle starts is known.

  On the other hand, transmissions that perform holding and switching control of each shift position using hydraulic oil supplied from a mechanical oil pump that uses the output of the internal combustion engine as a power source are widely used.

  In a vehicle equipped with such a transmission, while the vehicle is temporarily stopped, such as waiting for a signal, the transmission (start clutch) holds a start shift position by the hydraulic pressure of the mechanical oil pump. Thus, the vehicle can be started smoothly.

  However, when the idle stop system is applied to a vehicle equipped with this type of transmission, the mechanical oil pump does not operate with the automatic stop of the internal combustion engine.

  When the internal combustion engine is restarted in such a state, the operating oil pressure is increased with the operation of the mechanical oil pump. Until the operating oil pressure is sufficiently increased, the starting oil pressure is increased. Since the shift position cannot be held, there arises a problem that the start response is lowered.

  Therefore, in recent years, an idling stop that can maintain the shift position for starting and improve the starting responsiveness by supplying hydraulic oil regulated by an electric oil pump during the automatic stop of the internal combustion engine. A system has been proposed (see, for example, Patent Documents 1 and 2).

  Here, FIG. 3 and FIG. 4 are block diagrams schematically showing the main part of a conventional idle stop system.

  3 shows the running state of the vehicle, and FIG. 4 shows the stopped state of the vehicle in which the idle stop system is operated.

  That is, in the conventional idle stop system 100, since the internal combustion engine 101 is driven when the vehicle is running, the mechanical oil pump 102 using this as a power source is also operated.

  Therefore, the hydraulic oil in the oil pan 103 passes through the oil passage 104 and is sucked into the mechanical oil pump 102 and is pressurized and discharged by the mechanical oil pump 102. Due to this oil pressure, the elastic spring 115 of the regulator 105 is discharged. The hydraulic oil communicates and is supplied to an oil supply unit 107 having a start clutch C1 through a hydraulic control valve 106 (see FIG. 3).

  On the other hand, when the vehicle is stopped under predetermined conditions such as waiting for a signal, the control unit (ECU) 108 executes control, the idle stop system 100 is activated, and the internal combustion engine 101 is automatically stopped (FIG. 4). ,reference.).

  Then, the operation of the mechanical oil pump 102 using the internal combustion engine 101 as a power source is also stopped, and the regulator 105 is closed by the elastic force of the elastic spring 115 due to the decrease in the oil pressure. The supply of the hydraulic oil to the oil supply unit 106 provided with C1 is shut off.

  However, in this oil supply unit 106, particularly in a state where the supply of hydraulic oil to the start clutch C1 is shut off, the start shift position cannot be maintained, and there is a problem that start response is lowered.

  Therefore, in the conventional idle stop system 100, when the internal combustion engine 101 is automatically stopped, the electric motor M is driven by a battery (not shown), and the mechanical oil pump 102 using the electric motor M as a drive source is provided. The electric oil pump 201 is activated.

  Therefore, the hydraulic oil in the oil pan 103 is sucked into the electric oil pump 201 through the oil passage 104, and is pressurized and discharged by the electric oil pump 201. The oil pressure causes the regulator 105 to move to the elastic spring 115. The hydraulic oil is released against the elastic force, and the hydraulic oil is communicated and supplied to the oil supply unit 107 including the start clutch C1 through the hydraulic control valve 106 (see FIG. 4).

  Thus, in the conventional idle stop system 100, even if the internal combustion engine 101 is stopped to improve fuel efficiency, the hydraulic pressure necessary for the starting clutch C1 is supplied by the electric oil pump 201. It is possible to prevent a delay in the rise of the hydraulic pressure at the time of restart of the vehicle and improve the start response.

  Further, the hydraulic oil supplied to the oil supply unit 107 including the start clutch C1 via the hydraulic control valve 106 is returned again to the oil pan 103 via an oil passage (not shown).

  The idle stop system 100 is entirely controlled by a control unit (ECU) 108.

JP 2006-161838 A JP 2003-94984 A

  However, the conventional idle stop system 100 has the following problems.

  First, since the electric oil pump 201 has many disadvantageous factors in terms of system configuration, such as the electric motor M and the driver, there is a problem that the cost of the entire system increases.

  Furthermore, while the idle stop system 100 is operating and the internal combustion engine 101 is automatically stopped, the electric oil pump 201 is always operated in preparation for the restart of the internal combustion engine 101.

  Therefore, the electric oil pump 201 during the operation of the idle stop system 100 consumes electric power, and there is a problem that the fuel consumption effect is reduced by this electric power consumption.

  The present invention aims to solve such a problem, and without using an electric oil pump, it is possible to improve the start response at the time of restart, to reduce the cost of the entire system, and to further improve the fuel consumption. Provide an idle stop system.

In order to solve the above problem,
An idle stop system according to the present invention includes an oil supply unit having a start clutch, switching means for communicating or shutting off hydraulic oil to the oil supply unit, two mechanical oil pumps driven by a driving force of an internal combustion engine, An engaging element that connects or disconnects the two mechanical oil pumps, and one of the two mechanical oil pumps is connected to the switching means, and the other is only the starting clutch. It is characterized by being connected to.

  That is, the present invention does not use an electric oil pump as in the prior art, and two mechanical oil pumps and an engagement element for connecting or releasing these mechanical oil pumps, start response at the time of restart. As a result, the cost of the entire system is reduced and the fuel efficiency is improved.

  Specifically, in a state where the vehicle is traveling, the switching means such as a regulator is opened by one mechanical oil pump and hydraulic oil is supplied to the oil supply unit as in the conventional case.

  On the other hand, when the vehicle is stopped under predetermined conditions such as waiting for a signal, the idle stop system is activated, the internal combustion engine is automatically stopped, and the operation of the one mechanical oil pump is also stopped. The switching means is closed, and the supply of the hydraulic oil to the oil supply unit is shut off.

  At this time, in the present invention, the engagement element is operated in accordance with a decrease in hydraulic pressure of the hydraulic oil, and one mechanical oil pump and the other mechanical oil pump are connected.

  However, when two mechanical oil pumps are connected (the vehicle is stopped), none of the mechanical oil pumps are driven, so that no wasted energy is consumed and fuel efficiency is improved. There is no reduction.

  When the internal combustion engine is restarted, the two mechanical oil pumps are driven simultaneously, but the other mechanical oil pump is connected only to the starting clutch.

  Therefore, when the internal combustion engine is restarted, the hydraulic oil can be immediately increased by supplying hydraulic oil from the two mechanical oil pumps simultaneously to the starting clutch.

  In addition, the other mechanical oil pump can be said to be a dedicated pump for supplying the hydraulic oil only to the starting clutch that requires the hydraulic oil most at the time of restart. It is preferable that it is a small one with good responsiveness compared to one mechanical oil pump.

  As described above, according to the present invention, the cost can be reduced without using an electric oil pump, and the hydraulic oil can be simultaneously supplied from two mechanical oil pumps to immediately increase the hydraulic pressure, thereby restarting the internal combustion engine. It is possible to prevent a delay in the rise of the hydraulic pressure at the time and improve the start response.

  According to the idling stop system for an internal combustion engine of the present invention, the start response at the time of restart can be improved without using an electric oil pump, the cost of the entire system can be reduced, and the fuel consumption can be improved. Can do.

It is a block diagram (running state) which outlined the principal part of the idle stop system of the present invention. It is a block diagram (stop state) which outlined the principal part of the idle stop system of the present invention. It is the block diagram (running state) which outlined the principal part of the conventional idle stop system. It is a block diagram (stop state) which outlined the principal part of the conventional idle stop system.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  1 and 2 are block diagrams schematically showing the main part of the idle stop system A of the present embodiment.

  1 shows the traveling state of the vehicle, and FIG. 2 shows the stopped state of the vehicle in which the idle stop system A is operated.

That is, the idle stop system A of the present embodiment includes two mechanical oil pumps 2 and 3 driven by the driving force of the internal combustion engine 1 and these two mechanical oil pumps 2 and 3.
Are connected to and disconnected from each other, a switching means 5 for communicating or shutting off hydraulic oil, and an oil supply unit 6 including a starting clutch C1.

  The internal combustion engine 1 is not limited to that type, and may be any type such as a reciprocating type, a diesel type, a hybrid type, or the like.

  Of the two mechanical oil pumps 2 and 3, one mechanical pump 2 is the same as the conventional one, and the description thereof will be omitted, but the other mechanical oil related to the one mechanical pump 2 is omitted. The pump 3 supplies the hydraulic pressure to the starting clutch C1 only at the time of starting (when the discharge pressure is low).

  Therefore, the other mechanical oil pump 3 has a performance capable of supplying hydraulic oil necessary for starting the internal combustion engine 1 to the start clutch C1 by restart cranking. A smaller size is preferable.

  These two mechanical oil pumps 2, 3 can be connected or opened by an engagement element 4.

  The engagement element 4 of the present embodiment includes a clutch portion 41 that can connect or release two mechanical oil pumps 2 and 3, and a hydraulic actuator 42 that drives the clutch portion 41.

  That is, when the hydraulic pressure of the actuator 42 is increased, the engagement element 4 of the present embodiment is moved in a direction in which the pressing plate 42b is separated from the clutch portion 41 against the elastic force of the spring 42a by the hydraulic pressure. The clutch part 41 interposed between the two mechanical oil pumps 2 and 3 is released.

  On the other hand, when the hydraulic pressure of the actuator 42 is decreased, the pressing plate 42b is moved toward the clutch portion 41 by the elastic force of the spring 42a as the hydraulic pressure is decreased, and is interposed between the two mechanical oil pumps 2 and 3. The clutch portion 41 is connected.

  The suction ports of these two mechanical oil pumps 2 and 3 are connected to the oil pan 7 through an oil passage 71.

  Of these two mechanical oil pumps 2, 3, one mechanical oil pump 2 is connected to a regulator (switching means) 5, and the other mechanical oil pump 3 is connected only to the starting clutch C1. It is comprised so that.

  The idle stop system A of the present embodiment configured as described above operates as follows.

  That is, since the internal combustion engine 1 is driven in a state where the vehicle is running, one mechanical oil pump 2 using this as a power source is also operated.

  Therefore, the hydraulic oil in the oil pan 7 passes through the oil passage 71 and is sucked into one mechanical oil pump 2 and is pressurized and discharged by the mechanical oil pump 2. The spring 51 is released against the elastic force of the spring 51, and the hydraulic oil is communicated and supplied to the oil supply unit 6 including the start clutch C1 through the hydraulic control valve 8 (see FIG. 1).

  On the other hand, when the vehicle is stopped under a predetermined condition such as waiting for a signal, the control unit (ECU) 9 executes control, the idle stop system A of the present embodiment is activated, and the internal combustion engine 1 is automatically stopped. (See FIG. 2).

  Then, the operation of the mechanical oil pump 2 using the internal combustion engine 1 as a power source is also stopped, and the regulator 5 is closed by the elastic force of the elastic spring 51 due to the decrease in the oil pressure. The supply of the hydraulic oil to the oil supply unit 6 provided with C1 is shut off.

  However, in this embodiment, the engagement element 4 for connecting or releasing the two mechanical oil pumps 2 and 3 in a connected manner is provided.

  Therefore, as the mechanical oil pump 2 stops operating, the hydraulic pressure of the hydraulic oil is decreased, and the clutch portion 41 is connected by the elastic force of the spring 42a of the engagement element 4 due to the decrease of the hydraulic pressure. It will stand by in the state where the two mechanical oil pumps 2 and 3 are connected (see FIG. 2).

  When the internal combustion engine is restarted, the two connected mechanical oil pumps 2 and 3 are simultaneously driven, while the other mechanical oil pump 3 is connected only to the starting clutch C1.

  Therefore, when the internal combustion engine 1 is restarted, the hydraulic oil sucked from the two mechanical oil pumps 2 and 3 through the oil passage 71 is simultaneously supplied to the starting clutch C1, and the hydraulic pressure can be immediately increased. The start response can be improved.

  Eventually, when the vehicle travels and the driving force of the internal combustion engine 1 increases, the hydraulic oil discharged from one mechanical oil pump 2 opens the regulator 5 due to the oil pressure, via the hydraulic control valve 6. Then, the oil is supplied to an oil supply unit 7 having a starting clutch C1 (see FIG. 1).

  At this time, in the other mechanical oil pump 3, the spring 42a of the engagement element 4 is compressed by the oil pressure, and the clutch portion 41 is released.

  Therefore, the other mechanical oil pump 3 does not perform useless work during traveling and can improve the efficiency of the system.

  Further, the hydraulic oil supplied to the oil supply unit 6 having the start clutch C1 through the hydraulic control valve 8 is returned again to the oil pan 7 through an oil passage (not shown).

  The idle stop system A of the present embodiment is entirely controlled by a control unit (ECU) 9.

  As described above, according to the idle stop system A of the present embodiment, the start-up response at the time of restarting the internal combustion engine is improved without using a conventional electric oil pump, thereby reducing the cost of the entire system. In addition, fuel consumption can be improved.

A. Idle stop system for internal combustion engine C1 Start clutch 1 Internal combustion engine 2 (One) mechanical oil pump 3 (Other) mechanical oil pump 4 Engagement element 5 Regulator (switching means)
6 Oil supply section

Claims (1)

In an idle stop system that automatically stops and automatically starts the internal combustion engine of the vehicle as the vehicle stops or starts,
An oil supply with a starting clutch;
Switching means for communicating or blocking hydraulic oil to the oil supply section;
Two mechanical oil pumps driven by the driving force of the internal combustion engine;
An engagement element for connecting or releasing the two mechanical oil pumps together,
One of the two mechanical oil pumps is connected to the switching means, and the other is connected only to the starting clutch.

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