JP2005330844A - Vacuum pump control method and vacuum pump mounting structure for diesel hybrid vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vacuum pump control method and mounting structure for a diesel hybrid vehicle, capable of appropriately maintaining negative pressure inside a negative pressure tank during EV traveling. <P>SOLUTION: Negative pressure inside the negative pressure tank is detected during EV traveling (Yes in Step S10, Step S11), and when negative pressure runs short, an engine is started and a vacuum pump is driven by idle driving (Yes in Step S12, Step S13). After start of the engine, charge amount of a battery is detected (Step S14), and when the charge amount is below a predetermined value, a clutch is engaged and power generation control is performed by engine traveling (No in Step S15, Steps S19 to S21). When the charge amount of the battery exceeds the predetermined value and a negative pressure value detected again is recovered to a predetermined value, the engine is stopped (Yes in Step S15, Step S16, Yes in Step S17, Step S18). <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a vacuum pump control method and a vacuum pump mounting structure for a diesel hybrid vehicle, and more particularly, to a vacuum pump control method for a diesel hybrid vehicle that can properly maintain a negative pressure in a negative pressure tank during EV traveling. And a vacuum pump mounting structure.

  2. Description of the Related Art Conventionally, a diesel hybrid vehicle including a diesel engine, an electric motor that generates a driving force other than the diesel engine, and a battery that serves as a power supply source for the electric motor is known (for example, see Patent Document 1).

  Among such hybrid vehicles, in a vehicle equipped with a negative pressure utilization device such as a brake booster, a variable nozzle turbocharger, or a throttle that operates by utilizing negative pressure, a vacuum pump that is a negative pressure generation source is a diesel pump. It is directly attached to the engine so as to be driven by the engine. That is, this vacuum pump is directly attached to a predetermined position of the diesel engine so as to be driven by, for example, rotation of the camshaft of the diesel engine. In addition, the negative pressure utilization device is connected to a negative pressure tank so that negative pressure can be used, and the vacuum pump and the negative pressure tank are also connected so as to be able to supply negative pressure.

  In addition, when the negative pressure of the vacuum pump configured integrally with the alternator is smaller than the intake manifold negative pressure downstream of the throttle valve, a hybrid vehicle configured to supply the intake manifold negative pressure to the brake booster is known (for example, Patent Document 2).

JP 2003-65099 A JP-A-10-89123

  However, since the conventional diesel hybrid vehicle includes a vacuum pump driven by an engine, when the EV traveling using only the electric motor as a drive source is performed for a long period of time when the engine is stopped, the vacuum pump is Is also stopped, and negative pressure cannot be supplied to the negative pressure tank. Therefore, if the negative pressure in the negative pressure tank continues to be used due to braking during EV traveling, there is a problem in that the negative pressure is insufficient, which may hinder the operation of the negative pressure utilization device.

  Further, it has been desired to provide a vacuum pump mounting structure for a diesel hybrid vehicle that can drive the vacuum pump when necessary even when the engine is stopped and can maintain the negative pressure in the negative pressure tank properly during EV traveling.

  The present invention has been made in view of the above, and is capable of appropriately maintaining the negative pressure in the negative pressure tank during EV traveling even in a diesel hybrid vehicle including a vacuum pump driven by an engine. It is an object of the present invention to provide a vacuum pump control method for a diesel hybrid vehicle that can perform the above-described operation.

  Further, the present invention provides a vacuum pump mounting structure for a diesel hybrid vehicle that can drive the vacuum pump even when the engine is stopped and can maintain the negative pressure in the negative pressure tank properly during EV traveling. With the goal.

  In order to solve the above-described problems and achieve the object, a vacuum pump control method for a diesel hybrid vehicle according to claim 1 of the present invention includes a diesel engine as a travel drive source, a stepped transmission, and the engine. A clutch for connecting / separating power transmission between the stepped transmissions, a motor generator for assisting the engine output by power generation by the engine output or battery power, and a negative pressure tank for supplying negative pressure to the negative pressure utilization device And a negative pressure detecting means for detecting a negative pressure in the negative pressure tank, and a vacuum pump driven by the engine and generating a negative pressure in the negative pressure tank, the engine running using only the engine as a drive source And EV running using only the motor generator as a drive source. In the vacuum pump control method of the Zell hybrid vehicle, when the negative pressure in the negative pressure tank is detected by the negative pressure detecting means during the EV traveling and the negative pressure in the negative pressure tank is insufficient, the engine And the vacuum pump is driven.

  According to a second aspect of the present invention, there is provided a vacuum pump control method for a diesel hybrid vehicle according to the first aspect of the present invention, wherein the charge amount of the battery is less than a predetermined value after the engine is started. When the motor generator is controlled to generate power by connecting the clutch and running the engine, the charge amount of the battery is not less than a predetermined value, and the negative pressure value in the negative pressure tank is restored to the predetermined value, The engine is stopped.

  According to a third aspect of the present invention, a vacuum pump mounting structure for a diesel hybrid vehicle includes a diesel engine as a travel drive source, a stepped transmission, and contact / separation of power transmission between the engine and the stepped transmission. A clutch that performs power generation by the engine output or a motor generator that assists the engine output by battery power, a negative pressure tank that supplies negative pressure to the negative pressure utilization device, and a negative pressure in the negative pressure tank is detected And a vacuum pump that generates a negative pressure in the negative pressure tank, and is either an engine running using only the engine as a driving source or an EV running using only the motor generator as a driving source. In the vacuum pump mounting structure of a diesel hybrid vehicle configured to be able to travel by one side, the vacuum Muponpu, the is directly attached to the motor generator, and is characterized in that is provided so as to be always driven by the driving of the motor generator during the EV traveling.

  According to a fourth aspect of the present invention, a vacuum pump mounting structure for a diesel hybrid vehicle includes a diesel engine as a travel drive source, a stepped transmission, and contact / separation of power transmission between the engine and the stepped transmission. A clutch that performs power generation by the engine output or a motor generator that assists the engine output by battery power, a negative pressure tank that supplies negative pressure to the negative pressure utilization device, and a negative pressure in the negative pressure tank is detected And a vacuum pump that generates a negative pressure in the negative pressure tank, and is either an engine running using only the engine as a driving source or an EV running using only the motor generator as a driving source. In the vacuum pump mounting structure of a diesel hybrid vehicle configured to be able to travel by one side, the vacuum The motor pump is provided between the motor generator via a clutch, and is provided so that the motor generator is driven during the EV travel and is driven only when the clutch is connected. To do.

  According to a fifth aspect of the present invention, there is provided a vacuum pump mounting structure for a diesel hybrid vehicle according to the third or fourth aspect, wherein power is transmitted between the output shaft of the stepped transmission and the rotating shaft of the motor generator. A clutch is provided in the path for connecting and separating the power transmission.

  According to the vacuum pump control method for a diesel hybrid vehicle according to the present invention (Claim 1), when the negative pressure in the negative pressure tank is insufficient during EV traveling, the vacuum pump is driven by the diesel engine to generate the negative pressure. Therefore, the shortage of negative pressure can be solved and the negative pressure can be properly maintained.

  According to the vacuum pump control method for a diesel hybrid vehicle according to the present invention (Claim 2), when the battery charge amount is insufficient, the battery charge amount is recovered by performing power generation control by engine running. In addition, by running the engine, the vacuum pump can be driven and the negative pressure shortage can be reliably resolved. In addition, when the battery charge is sufficient, the engine for driving the vacuum pump is operated to the minimum necessary while monitoring the negative pressure value in the negative pressure tank. Can do.

  According to the vacuum pump mounting structure for a diesel hybrid vehicle according to the present invention (Claim 3), the vacuum pump can be always driven by driving the motor generator without starting the diesel engine during EV traveling. In addition, the negative pressure in the negative pressure tank can be properly maintained.

  According to the vacuum pump mounting structure for a diesel hybrid vehicle according to the present invention (Claim 4), the vacuum pump can be operated without starting the diesel engine by connecting a clutch for driving the vacuum pump during EV traveling. It can be driven only when necessary, and the negative pressure in the negative pressure tank can be properly maintained. In addition, if the negative pressure in the negative pressure tank is an appropriate value during EV traveling, the clutch for driving the vacuum pump is disengaged so that the motor generator does not always have to rotate the vacuum pump. Since loss can be avoided, battery consumption can be suppressed.

  According to the vacuum pump mounting structure for a diesel hybrid vehicle according to the present invention (Claim 5), it is provided in the power transmission path between the output shaft of the stepped transmission and the rotating shaft of the motor generator while the engine is running. By disengaging the clutch, the output shaft of the stepped transmission does not have to be accompanied by a motor generator and a vacuum pump, so that friction loss can be avoided and fuel efficiency can be improved.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

  First, a schematic configuration of a diesel hybrid vehicle will be described with reference to FIG. Here, FIG. 2 is a schematic view showing a vacuum pump mounting structure of the diesel hybrid vehicle according to Embodiment 1 of the present invention.

  As shown in FIG. 2, the diesel hybrid vehicle 10 is provided with a diesel engine 11 as a travel drive source. A vacuum pump (V / P) 30 as a negative pressure generation source is directly attached to the diesel engine 11 for a negative pressure utilization device such as a brake booster, a variable nozzle turbocharger, and a throttle (not shown). That is, the vacuum pump 30 is directly attached to the diesel engine 11 by known means so as to be driven by, for example, rotation of a camshaft (not shown) of the diesel engine 11.

  The negative pressure utilization device is connected to a negative pressure tank (not shown) so that negative pressure can be used, and the vacuum pump 30 and the negative pressure tank are also connected so that negative pressure can be supplied by a pipe (not shown). Has been. The negative pressure in the negative pressure tank is detected by a sensor (negative pressure detection means) (not shown).

  Although not shown, the diesel engine 11 includes a common rail fuel injection system, a variable nozzle turbocharger that increases the intake air amount using exhaust gas pressure, and variable control of the opening and closing operation timing of the intake and exhaust valves. A variable valve timing mechanism is provided.

  Although not shown, in the exhaust passage of the diesel engine 11, a particulate filter carrying an NOx storage reduction catalyst for purifying particulate matter and nitrogen oxides (NOx) in the exhaust gas, An exhaust gas recirculation device that recirculates part of the exhaust gas to the intake system is provided.

  The driving force generated in the diesel engine 11 is transmitted to the drive wheels 13 through a stepped transmission (hereinafter referred to as MMT (multi-mode manual transmission)) 12, a differential gear 15 and a drive shaft 14 capable of automatic transmission. It is like that. The MMT 12 electrically and automatically controls a gear shift operation by an actuator in accordance with a traveling state. Reference numeral 22 denotes an input shaft of the MMT 12, and reference numeral 23 denotes an output shaft of the MMT 12.

  Between the diesel engine 11 and the MMT 12, there is provided a clutch 12a that performs contact and separation of power transmission, and the contact and separation operation is automatically and electrically controlled by an actuator in accordance with the traveling state.

  Further, the diesel engine 11 is configured such that its fuel injection amount, intake air amount, and the like are controlled in order to output the requested engine torque commanded from the MMT 12. The required fuel injection amount of the diesel engine 11 is determined based on, for example, a map from the engine speed and the accelerator opening, and fuel injection is executed.

  A motor generator (MG) 17 in which a drive system gear unit (gear train) is integrated is connected to a battery 20 that is a chargeable / dischargeable secondary battery via an inverter 19 and functions as a motor that is a travel drive source. The power running mode and the regenerative operation mode functioning as a generator are configured to take two operating states. Reference numeral 25 denotes a rotating shaft of the motor generator 17.

  For example, the motor generator 17 receives power supplied from the battery 20 in the power running operation mode, and generates power for driving the drive shaft 14. In the regenerative operation mode, the motor generator 17 converts the driving force transmitted from the diesel engine 11 or the drive shaft 14 into electric power and charges the battery 20.

  Whether the motor generator 17 is operated in the power running operation mode or the regenerative operation mode is determined in consideration of a charge amount SOC (State of Charge) of the battery 20.

  The diesel hybrid vehicle 10 configured as described above is basically controlled as follows based on output information from various sensors such as a vehicle speed sensor and an accelerator opening sensor by an electronic control unit (ECU) (not shown). It can drive in the state of.

  That is, in a relatively low speed state in which the diesel hybrid vehicle 10 starts traveling, the vehicle travels (EV traveling) by powering the motor generator 17 while the diesel engine 11 is stopped. Then, when the diesel hybrid vehicle 10 reaches a predetermined speed or load after the start of traveling, the diesel engine 11 is cranked and started using the motor generator 17 and the operation is shifted to the operation using the diesel engine 11.

  Further, during steady operation, the diesel engine 11 is normally operated so as to generate an output substantially equal to the required power of the drive shaft 14. At this time, almost all of the output of the diesel engine 11 is transmitted to the drive shaft 14.

  On the other hand, when the charge amount SOC of the battery 20 is reduced to a predetermined reference value or less, the diesel engine 11 is operated with an output exceeding the required power of the drive shaft 14, and a part of the surplus power is a motor. It is regenerated as electric power by the generator 17 and used for charging the battery 20.

  When the output torque of the diesel engine 11 is insufficient, the insufficient torque is assisted by the motor generator 17 according to the charge amount SOC of the battery 20, and the necessary torque is ensured.

  The diesel hybrid vehicle 10 is also subjected to so-called eco-run (economy & ecology running) control in order to save fuel and reduce exhaust emissions. For example, when the diesel hybrid vehicle 10 stops due to a signal waiting at an intersection or the like, the diesel engine 11 is automatically stopped under a predetermined stop condition, and then the predetermined restart condition (for example, when the accelerator pedal is depressed). Thus, the diesel engine 11 is also restarted.

  The above is the basic configuration and basic control operation of the diesel hybrid vehicle 10 according to the present invention.

  Now, when the EV traveling is carried out for a long period, the diesel engine 11 is stopped during that period, so the vacuum pump 30 driven by the diesel engine 11 is also stopped, and negative pressure is supplied to the negative pressure tank. I can't. Therefore, if the negative pressure in the negative pressure tank is continuously used due to braking, the negative pressure is insufficient.

  Therefore, in order to properly maintain the negative pressure in the negative pressure tank during EV traveling, the ECU performs the control shown in FIG. Here, FIG. 1 is a flowchart showing a control method for properly maintaining the negative pressure in the negative pressure tank.

  First, it is determined whether or not EV traveling is in progress (step S10). That is, it is determined whether or not the diesel engine 11 is stopped and the clutch 12a is not connected. If the EV is not running (No at Step S10), that is, if the engine is running, the vacuum pump 30 is driven and the negative pressure does not become insufficient, so the control is terminated.

  If the vehicle is traveling in EV (Yes at Step S10), the negative pressure in the negative pressure tank is detected by a sensor installed in the negative pressure tank (Step S11). It is determined whether or not the negative pressure level exceeds a certain value (for example, −20 KPa), that is, whether or not the negative pressure is insufficient (step S12).

  If the negative pressure is not insufficient (No at Step S12), the control from Step S10 to Step S12 is repeated. On the other hand, if the negative pressure is insufficient (Yes at Step S12), the diesel engine 11 is started to perform idle operation, and the vacuum pump 30 is driven to generate a negative pressure in the negative pressure tank (Step S13).

  Next, the battery charge amount SOC is read (step S14), and it is determined whether the battery charge amount SOC exceeds a certain value (for example, 60%), that is, whether the battery charge amount SOC is sufficient (step S14). Step S15).

  If the battery charge SOC is sufficient (Yes in step S15), the negative pressure in the negative pressure tank is again determined to determine whether or not the negative pressure shortage has been resolved by driving the vacuum pump 30 in step S13. Is detected (step S16).

  If the negative pressure level falls below a certain value, that is, if the negative pressure deficiency is resolved (Yes in step S17), the idle operation of the diesel engine 11 is stopped, and the drive of the vacuum pump 30 is stopped. Control ends (step S18). As described above, since the idle operation for driving the vacuum pump 30 is performed to the minimum necessary while monitoring the negative pressure value in the negative pressure tank, it is possible to suppress deterioration of fuel consumption.

  On the other hand, if the negative pressure level is not below a certain value (No at Step S17), the process returns to Step S13 to continue driving the vacuum pump 30. In this case, since the diesel engine 11 has already been started, the idle operation may be continued.

  If it is determined in step S15 that the battery charge amount SOC is not sufficient (No in step S15), the clutch 12a is connected (step S19), the engine is switched to running (step S20), and power generation control by the motor generator 17 is performed. To implement. Thus, the battery charge amount SOC can be recovered, and the vacuum pump 30 can be driven by running the engine to reliably eliminate the negative pressure shortage (step S21).

  As described above, according to the first embodiment, in the system in which the vacuum pump 30 is directly attached to the diesel engine 11, the shortage of negative pressure in the negative pressure tank can be surely eliminated, and an appropriate negative pressure value is obtained. Can be maintained.

  FIG. 3 is a schematic diagram showing a vacuum pump mounting structure of a diesel hybrid vehicle according to Embodiment 2 of the present invention. In the following description, members that are the same as or correspond to those already described are assigned the same reference numerals, and redundant description is omitted.

  As shown in FIG. 3, the vacuum pump 30 is provided via a clutch 17 a that contacts and separates power transmission so as to be driven by the rotating shaft 25 of the motor generator 17. The clutch 17a is electrically and automatically controlled by an actuator when necessary to make contact and separation.

  Further, the vacuum pump 30 and a negative pressure tank (not shown) are connected by a pipe (not shown) so that negative pressure can be supplied. The vacuum pump 30 and the clutch 17a may be provided in the same housing as the motor generator 17, or may be provided separately.

  Next, a control method for appropriately maintaining the negative pressure in the negative pressure tank will be described with reference to FIG. Here, FIG. 4 is a flowchart showing a control method for appropriately maintaining the negative pressure in the negative pressure tank.

  First, it is determined whether or not EV traveling is in progress (step S30). That is, it is determined whether or not the diesel engine 11 is stopped and the clutch 12a is not connected. If the vehicle is not traveling in EV (No at Step S30), the control is terminated.

  If EV traveling is in progress (Yes at Step S30), a negative pressure in the negative pressure tank is detected by a sensor installed in the negative pressure tank (Step S31), and the negative pressure level is a certain value (for example, −20 KPa). ), That is, whether or not the negative pressure is insufficient (step S32).

  If the negative pressure is not insufficient (No at Step S32), the control from Step S30 to Step S32 is repeated. On the other hand, if the negative pressure is insufficient (Yes at step S32), the vehicle is currently traveling in EV and the motor generator 17 is being driven. Therefore, the clutch 17a is connected and the vacuum pump 30 is driven to operate the negative pressure tank. A negative pressure is generated (step S33). That is, the vacuum pump 30 can be driven by driving the motor generator 17 without starting the diesel engine 11.

  Next, in order to determine whether or not the negative pressure deficiency has been resolved by driving the vacuum pump 30, the negative pressure in the negative pressure tank is detected again (step S34). If the negative pressure level falls below a certain value, that is, if the negative pressure deficiency is resolved (Yes at Step S35), the clutch 17a is disconnected, the drive of the vacuum pump 30 is stopped, and the control is finished (Step S36). ).

  Thus, by disconnecting the clutch 17a when it is not necessary to drive the vacuum pump 30, the motor generator 17 does not have to always rotate the vacuum pump 30, and friction loss can be avoided, so that consumption of the battery 20 is suppressed. can do. If the negative pressure level is not below a certain value (No at Step S35), the process returns to Step S33 to continue driving the vacuum pump 30.

  As described above, according to the second embodiment, driving of the vacuum pump 30 by the motor generator 17 can surely eliminate the negative pressure in the negative pressure tank. In particular, by providing the clutch 17a, the vacuum pump 30 can be driven only when necessary, so that the consumption of the battery 20 can be suppressed.

  FIG. 5 is a schematic diagram showing a vacuum pump mounting structure of a diesel hybrid vehicle according to Embodiment 3 of the present invention. As shown in FIG. 5, the vacuum pump 30 is directly attached to the motor generator 17 so as to be driven by the rotating shaft 25 of the motor generator 17. The vacuum pump 30 may be provided in the same housing as the motor generator 17 or may be provided separately.

  The vacuum pump 30 and a negative pressure tank (not shown) are connected by a pipe (not shown) so that negative pressure can be supplied. That is, the vacuum pump 30 is always driven when the motor generator 17 is driven, and is configured to generate a negative pressure in the negative pressure tank.

  As described above, according to the third embodiment, even when the EV traveling is performed for a long period and the negative pressure of the negative pressure tank is used for braking, the vacuum pump 30 generates a negative pressure in the negative pressure tank. Therefore, a proper negative pressure can be maintained.

  FIG. 6 is a schematic view showing a vacuum pump mounting structure of a diesel hybrid vehicle according to Embodiment 4 of the present invention. As shown in FIG. 6, the vacuum pump 30 is directly attached to the motor generator 17 so as to be driven by the rotating shaft 25 of the motor generator 17.

  In addition, a clutch 17b is provided on the rotating shaft of the motor generator 17 so that the driving force of the motor generator 17 can be transmitted to the output shaft 23 of the MMT 12 only when necessary. The vacuum pump 30 and a negative pressure tank (not shown) are connected by a pipe (not shown) so that negative pressure can be supplied. The vacuum pump 30 and the clutch 17b may be provided in the same housing as the motor generator 17, or may be provided separately.

  In the clutch 17b, the contact / separation operation is electrically and automatically controlled by an actuator. Therefore, since the clutch 17b is connected during EV traveling, the driving force of the motor generator 17 is transmitted to the output shaft 23 of the MMT 12 and used to drive the vacuum pump 30.

  Further, if the clutch 17b is disconnected while the engine is running, it is not necessary to use the driving force from the output shaft 23 of the MMT 12 for the rotation of the motor generator 17. Further, if the motor generator 17 is driven with the clutch 17b disconnected, the motor generator 17 can be used only for driving the vacuum pump 30.

  As described above, according to the fourth embodiment, even when the EV traveling is performed for a long period and the negative pressure of the negative pressure tank is used for braking, the vacuum pump 30 generates negative pressure in the negative pressure tank. Therefore, a proper negative pressure can be maintained.

  Further, since the clutch 17b is provided, the output shaft 23 of the MMT 12 does not have to rotate the motor generator 17 while the engine is running, so that friction loss can be avoided, fuel consumption can be improved, and the motor generator 17 can be improved. Can be used only for driving the vacuum pump 30 when necessary.

  FIG. 7 is a schematic diagram showing a vacuum pump mounting structure of a diesel hybrid vehicle according to Embodiment 5 of the present invention. In the fifth embodiment, as shown in FIG. 7, the clutch 17b is added to the configuration of the second embodiment shown in FIG. Alternatively, the fifth embodiment is a configuration in which the clutch 17a is added to the configuration shown in FIG. 6 of the fourth embodiment.

  Therefore, according to the fifth embodiment, the operations and effects of the second embodiment and the fourth embodiment are achieved. That is, even if the EV traveling (the clutch 17b is in a connected state) is performed for a long time and the negative pressure of the negative pressure tank is used for braking, the vacuum pump 30 is driven and negatively connected by connecting the clutch 17a as necessary. Since the pressure can be generated, the negative pressure in the negative pressure tank can be properly maintained.

  Further, by disconnecting the clutch 17a when it is not necessary to drive the vacuum pump 30, it is not necessary for the motor generator 17 to always rotate the vacuum pump 30, and friction loss can be avoided, so that the consumption of the battery 20 is suppressed. be able to.

  Further, by providing the clutch 17b, the output shaft 23 of the MMT 12 does not have to rotate the motor generator 17 and the vacuum pump 30 (when the clutch 17a is connected) while the engine is running, so friction loss can be avoided and fuel consumption can be avoided. Can be improved.

  As described above, the vacuum pump control method and the vacuum pump mounting structure for a diesel hybrid vehicle according to the present invention are useful for a diesel hybrid vehicle in which the negative pressure in the negative pressure tank is often used due to braking during EV traveling. In particular, the present invention is suitable for a diesel hybrid vehicle aiming to properly maintain the negative pressure in the negative pressure tank during EV traveling.

It is a flowchart which shows the control method for maintaining the negative pressure in the negative pressure tank concerning Example 1 of this invention appropriately. It is a schematic diagram which shows the vacuum pump mounting structure of a diesel hybrid vehicle. It is a schematic diagram which shows the vacuum pump mounting structure of the diesel hybrid vehicle which concerns on Example 2 of this invention. It is a flowchart which shows the control method for maintaining the negative pressure in a negative pressure tank appropriately. It is a schematic diagram which shows the vacuum pump mounting structure of the diesel hybrid vehicle which concerns on Example 3 of this invention. It is a schematic diagram which shows the vacuum pump mounting structure of the diesel hybrid vehicle which concerns on Example 4 of this invention. It is a schematic diagram which shows the vacuum pump mounting structure of the diesel hybrid vehicle which concerns on Example 5 of this invention.

Explanation of symbols

10 Diesel Hybrid Vehicle 11 Diesel Engine 12 MMT (Stepped Transmission)
12a Clutch 17 Motor generator 17a, 17b Clutch 19 Inverter 20 Battery 23 Output shaft 25 Rotating shaft 30 Vacuum pump

Claims (5)

A diesel engine as a travel drive source, a stepped transmission, a clutch for connecting and disconnecting power transmission between the engine and the stepped transmission, and assisting the engine output by power generation or battery power by the engine output A negative pressure tank for supplying a negative pressure to the negative pressure utilization device, a negative pressure detection means for detecting a negative pressure in the negative pressure tank, and a negative pressure applied to the negative pressure tank driven by the engine. A vacuum pump to generate,
In a vacuum pump control method for a diesel hybrid vehicle configured to be able to run by either engine running using only the engine as a drive source or EV running using only the motor generator as a drive source,
The negative pressure detection means detects the negative pressure in the negative pressure tank during the EV travel, and when the negative pressure in the negative pressure tank is insufficient, the engine is started to drive the vacuum pump. A vacuum pump control method for a diesel hybrid vehicle. When the charge amount of the battery is less than a predetermined value after the engine is started, the motor generator is controlled to generate power by connecting the clutch and running the engine,
2. The diesel hybrid vehicle according to claim 1, wherein the engine is stopped when a charge amount of the battery is equal to or larger than a predetermined value and a negative pressure value in the negative pressure tank is recovered to a predetermined value. Vacuum pump control method. A diesel engine as a travel drive source, a stepped transmission, a clutch for connecting and disconnecting power transmission between the engine and the stepped transmission, and assisting the engine output by power generation or battery power by the engine output A motor generator to perform, a negative pressure tank for supplying negative pressure to the negative pressure utilization device, negative pressure detecting means for detecting negative pressure in the negative pressure tank, and a vacuum pump for generating negative pressure in the negative pressure tank; With
In a vacuum pump mounting structure of a diesel hybrid vehicle configured to be able to travel by either one of engine traveling using only the engine as a driving source and EV traveling using only the motor generator as a driving source,
The vacuum pump mounting structure for a diesel hybrid vehicle, wherein the vacuum pump is directly attached to the motor generator and is always driven by driving the motor generator during the EV traveling. A diesel engine as a travel drive source, a stepped transmission, a clutch for connecting and disconnecting power transmission between the engine and the stepped transmission, and assisting the engine output by power generation or battery power by the engine output A motor generator to perform, a negative pressure tank for supplying negative pressure to the negative pressure utilization device, negative pressure detecting means for detecting negative pressure in the negative pressure tank, and a vacuum pump for generating negative pressure in the negative pressure tank; With
In a vacuum pump mounting structure of a diesel hybrid vehicle configured to be able to travel by either one of engine traveling using only the engine as a driving source and EV traveling using only the motor generator as a driving source,
The vacuum pump is provided between the motor generator via a clutch, and is provided so that the motor generator is driven during the EV travel and is driven only when the clutch is connected. Features a vacuum pump mounting structure for a diesel hybrid vehicle.   The diesel engine according to claim 3 or 4, wherein a clutch for connecting and disconnecting the power transmission is provided in a power transmission path between an output shaft of the stepped transmission and a rotation shaft of the motor generator. Hybrid pump mounting structure for hybrid vehicles.

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