US20010011456A1 - Arrangement for producing a vacuum in a motor vehicle system - Google Patents
Arrangement for producing a vacuum in a motor vehicle system Download PDFInfo
- Publication number
- US20010011456A1 US20010011456A1 US09/760,207 US76020701A US2001011456A1 US 20010011456 A1 US20010011456 A1 US 20010011456A1 US 76020701 A US76020701 A US 76020701A US 2001011456 A1 US2001011456 A1 US 2001011456A1
- Authority
- US
- United States
- Prior art keywords
- vacuum
- power brake
- fuel
- brake system
- pump
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
- F02M25/089—Layout of the fuel vapour installation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/24—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being gaseous
- B60T13/46—Vacuum systems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/02—Arrangements of pumps or compressors, or control devices therefor
Definitions
- the invention relates to an arrangement for producing a vacuum in a motor vehicle system including a pump, which is connected, with its suction side, to a pneumatic power brake system for generating a vacuum in the power brake system.
- the airflow to the engine cylinders is restricted in accordance with the amount of fuel injected by a throttle valve arranged in the intake duct.
- the throttle valve position is controlled to the extent that the cross-section constriction in the intake duct causes the cylinders to have a correspondingly smaller filling. This results in a negative pressure in the suction manifold downstream of the throttle valve.
- the negative pressure is used in spark-ignition engines for the evacuation of a vacuum reservoir for the power brake system.
- this vacuum is used in the prior art for the regeneration of a fuel-vapor adsorption system.
- the vacuum in the intake region is employed to generate a scavenging airflow through the activated-carbon canister.
- the throttling means may even be fully replaced by controlled direct fuel injection with throttle-free load control and variable inlet valve operation.
- virtually no usable vacuum will be generated in the intake duct, i.e. the intake duct serves exclusively for the supply of air to the cylinders.
- the object of the present invention is to provide an arrangement with which a power brake system and a fuel-retaining (fuel vapor adsorption) system can be operated by a vacuum generated by a pump wherein, at the same time, the fuel consumption is reduced and the amount of pollutants emitted are minimized.
- a vacuum pump In an arrangement for producing a vacuum in a motor vehicle system including an internal combustion engine with an air intake system, a vacuum-operated power brake system for braking the vehicle and a fuel vapor adsorption system for collecting fuel vapors, a vacuum pump is provided which has a suction side in communication selectively with the vacuum operated power brake system and the fuel vapor adsorption system and a discharge side in communication with the air intake system of the internal combustion engine.
- Such a fuel-vapor-adsorption system can also be operated in the high load range or in the full load range of the engine.
- a high air mass flow is supplied to the engine so that a very efficient regeneration is possible.
- the conversion of the fuel vapors in the engine is particularly effective because of better engine charge conditions.
- an insufficient vacuum is generated during high load engine operation for proper braking operation or for a proper regeneration of the fuel vapor adsorber.
- the activation of the power-brake system and the regeneration of the fuel vapor adsorber system can be achieved with a single pump.
- the air flow or air/fuel-vapor flow generated by the pump is introduced into the intake system of the internal combustion engine.
- the single FIGURE shows a circuit diagram of an arrangement for producing a vacuum in a motor vehicle in accordance with the invention.
- An arrangement 1 for producing a vacuum in a motor-vehicle system comprises a pump 2 , which is connected at its suction side, via a line arrangement 3 , to a pneumatic power brake system 4 .
- an activated-carbon canister 5 of a fuel-vapor-adsorbing system 6 which is known per se and is in communication with a fuel tank 27 , is connected to the line arrangement 3 at the suction side of the pump 2 .
- the pump 2 is connected at its delivery side to an air-intake system 7 of an internal combustion engine 8 .
- the pump 2 is a suction pump driven preferably by an electric motor 9 .
- An encapsulated explosion-protected diaphragm pump 2 has been found to be particularly advantageous, since a diaphragm pump has no leakages and, at a high vacuum without gas flow, consumes only a small amount of power because the gas in the pump chamber acts as a pneumatic spring.
- the pump may be driven by the internal combustion engine via an electromagnetic clutch.
- an explosive fuel/air mixture is pumped by the diaphragm pump 2 from the activated-carbon canister 5 to the engine intake duct 7 .
- the diaphragm pump 2 functions in a similar manner as a rubber-bellow system. It is not subject to leakage. No fuel/air mixture flowing from the activated-carbon canister 5 can escape into the surroundings on the suction side of the diaphragm pump 2 . The same is true for the delivery side, since the fuel/air mixture conducted on this side of the diaphragm pump 2 is conveyed through the leak-proof line 23 to the intake system 7 and passes from there directly into the internal combustion engine 8 , where it is combusted.
- the engine shown here is a spark-ignition engine.
- the diaphragm pump 2 does not have a shaft extending through a housing wall so that no medium can escape. Such a pump has therefore exceptional explosion-proof properties.
- the activated-carbon canister 5 is provided with HC sensors 10 , which are connected to an electronic control unit 13 via signal lines 11 .
- the HC-sensors 10 are provided for determining the charge of the activated carbon canister 5 .
- the values determined are transmitted continuously to an electronic motor-control unit 13 , which can be a conventional engine-control unit.
- the power brake system 4 is provided with a pressure sensor 14 , which is connected to the electronic control unit 12 via a signal line 15 and which determines the pressure present in the power brake system 4 . This value is transmitted to the control unit 12 via the signal line 15 .
- the electronic control unit 12 is designed as a separate component of the device 1 . However, it is of course within an expert's discretion to integrate the electronic control unit 12 in a control unit, which is already present in the motor vehicle. This may be for example the electronic engine-control unit 13 of the internal combustion engine 8 .
- a change-over valve designed as a spring-resetting 3/2-port directional control valve 16 is arranged between the diaphragm pump 2 , the activated-carbon canister 5 and the power brake system 4 .
- communication is established, via the line system 3 , between the diaphragm pump 2 and the power brake system 4 or, by way of a line 17 , between the pump 2 and the activated-carbon canister 5 .
- the regenerating line 17 includes a pulsed fuel tank vent valve 18 and extends between the 3/2-port directional control valve 16 and the activated-carbon canister 5 .
- the 3/2-port directional control valve 16 and the fuel-tank vent valve 18 are in communication with the electronic control unit 12 and the electronic engine-control unit 13 via signal lines 19 , 20 , 21 .
- a first non-return valve 22 is arranged in the line 3 between the 3/2-port directional control valve 16 and the power brake system 4 . If the diaphragm pump 2 breaks down, air is therefore prevented from flowing into the power brake system 4 , and a vacuum present in the power brake system 4 can be maintained.
- a throttle element (which is not illustrated as it is known per se) for controlling the amount of air supplied to the internal combustion engine 8 is provided in the intake system 7 .
- a line 23 extends from the diaphragm pump 2 to the intake system 7 and is connected thereto upstream of the throttle element, in the direction of intake air flow.
- a further line 24 of the line system 3 is provided between the intake system 7 and the power brake system 4 .
- the further line 24 is connected to the intake manifold 25 of the intake system 7 downstream of the throttle element.
- the further line 24 permits a vacuum produced by a throttle element in the intake system 7 to be used additionally for the evacuation of the power brake system 4 .
- the vacuum is only applied if it is greater than the vacuum, which can be produced by the electric pump motor 9 .
- the pump motor 9 is switched on by the control unit 22 when the vacuum in the power brake system becomes less than a predetermined value sufficient to safely operate the power brakes.
- a second non-return valve 26 is provided in the further line 24 .
- the diaphragm pump 2 is switched on as a function of the charge of the activated carbon canister 5 and/or of the negative pressure (vacuum) state of the power brake system 4 .
- the vacuum requirement of the power brake system 4 is the principal parameter for the electronic control unit 12 because of vehicle safety consideration. This means that, when a pressure above a desired negative pressure is present in the power-brake system 4 that is the vacuum is less than the predetermined value, the 3/2-port directional control valve 16 is switched in such a manner that the diaphragm pump 2 and the power brake system 4 are in line connection and the latter is evacuated by the diaphragm pump 2 .
- the switching of the 3/2-port directional control valve 16 takes place via the electronic control unit 12 at an appropriate signal from the pressure sensor 14 .
- the 3/2-port directional control valve 16 is de-energized so that, in this rest position of the 3/2-port directional control valve 16 , the suction side of the diaphragm pump 2 is connected to the power brake system 4 . It is therefore ensured that the valve 16 is spring-biased to a position in which the vacuum for the power brake system 4 is provided when there is an electrical line interruption to the 3/2-port directional control valve 16 .
- the fuel adsorbing system 6 is regenerated by switching of the 3/2-port directional control valve 16 depending on need. However, the valve 16 can be switched over only when the power brake system 4 has a vacuum supply sufficient for safe operation of the brakes.
- the activated carbon canister 5 is regenerated depending on charge sensing means 10 disposed in the activated-carbon canister 5 .
- the diaphragm pump 2 is activated and the 3/2-port directional control valve 16 is energized, whereby the connection between the diaphragm pump 2 and the activated-carbon canister 5 is established.
- an additional air/fuel mixture is supplied to the internal combustion engine 8 resulting in a change of the lambda value of the exhaust gas.
- the regeneration procedure of the activated-carbon canister 5 is controlled by the control unit 12 and the engine-control unit by a pulsing of the fuel-tank vent valve 18 .
- the charge of the activated carbon canister 5 is evaluated by evaluation electronics of the electronic control unit 12 using the signals from the HC-sensors 10 in the activated-carbon canister 5 .
- the diaphragm pump 2 is switched on as required in order to regenerate the fuel-adsorbing system 6 .
- the fuel-tank vent valve 18 is activated by a pulse-width-modulated activating signal of the electronic unit 12 , depending on the engine load and engine speed, when there is a sufficiently large vacuum in the regenerating line 17 and the activated-carbon canister 5 has a sufficiently large charge to justify regeneration.
- the fuel-tank vent valve 18 is a valve, which can merely be opened and closed. Its opening cross-section cannot be varied. In order to control the flow volume from the activated-carbon canister 5 to the internal combustion engine 8 , it is necessary to provide a flow cross-section corresponding to the operating state of the internal combustion engine 8 and the state of the adsorbing system 6 . Since, however, the fuel-tank vent valve 18 can only be completely opened or closed, the opening and closing of the fuel-tank vent valve 18 is pulsed in order to simulate a variable opening cross-section.
- the pulsing of the fuel-tank vent valve 18 takes place via the pulse-width-modulated signal of the control unit 12 , which may, for example, be a square-wave signal recurring at a frequency of 10 Hz.
- the pulse width of the signal determines the energizing duration and therefore also the opening duration of the fuel-tank vent valve 18 . Different pulse widths are therefore used to obtain different opening durations simulating a variable cross section of the fuel-tank vent valve 18 .
- the fuel-tank vent valve 18 When the activated-carbon canister 5 is fully charged, the fuel-tank vent valve 18 is operated at a very small pulse ratio. When the activated-carbon canister 5 has a small charge, the fuel-tank vent valve 18 is operated at a large pulse ratio. Since a vacuum is constantly provided by the diaphragm pump 2 , the pulse ratio depends on the charge of the activated-carbon canister 5 and on the air mass flow through the internal combustion engine 8 .
- the arrangement for producing a vacuum in a motor vehicle system is particularly suitable for use in connection with spark-ignition engines. However, it may, of course, also be used in diesel engines or other internal combustion engines, specifically whenever a power brake system and a fuel adsorption system are to be supplied with a sufficient operating vacuum.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transportation (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
- Supplying Secondary Fuel Or The Like To Fuel, Air Or Fuel-Air Mixtures (AREA)
Abstract
In an arrangement for producing a vacuum in a motor vehicle system including an internal combustion engine with an air intake system, a vacuum-operated power brake system for braking the vehicle and a fuel vapor adsorption system for collecting fuel vapors, a vacuum pump is provided which has a suction side in communication selectively with the vacuum operated power brake system and the fuel vapor adsorption system and a discharge side in communication with the air intake system of the internal combustion engine.
Description
- The invention relates to an arrangement for producing a vacuum in a motor vehicle system including a pump, which is connected, with its suction side, to a pneumatic power brake system for generating a vacuum in the power brake system.
- It is known in practice that diesel engines are provided with vacuum pumps, which are connected with their suction side to a power brake system in order to produce the vacuum required for its operation. Air taken in from the latter is discharged to the surroundings. Vacuum pumps are needed because diesel engines are operated essentially without the throttle elements, which are provided in the intake ducts of spark-ignition engines. Therefore, in contrast to conventional spark-ignition engines, negative pressure, that is a vacuum, which can be used for operating the power brake systems, is not produced in the intake duct of a diesel engine.
- In the case of conventional spark-ignition engines, the airflow to the engine cylinders is restricted in accordance with the amount of fuel injected by a throttle valve arranged in the intake duct. During partial-load operation of the spark-ignition engine, the throttle valve position is controlled to the extent that the cross-section constriction in the intake duct causes the cylinders to have a correspondingly smaller filling. This results in a negative pressure in the suction manifold downstream of the throttle valve. The negative pressure is used in spark-ignition engines for the evacuation of a vacuum reservoir for the power brake system.
- Moreover, this vacuum is used in the prior art for the regeneration of a fuel-vapor adsorption system. The vacuum in the intake region is employed to generate a scavenging airflow through the activated-carbon canister.
- To meet exhaust-emission regulations, warm-up procedures require that modern engines are driven with retarded ignition and increased idling speed. Also, the power consumed and the friction generated by additional equipment increase the load on the engine. As a result, the throttle valve has to be opened relatively wide during engine warm-up so that the vacuum available during this operating period is very small.
- With further efficiency-increasing measures in the spark-ignition engine for a reduction of the consumption, the throttling means may even be fully replaced by controlled direct fuel injection with throttle-free load control and variable inlet valve operation. In these engine concepts, virtually no usable vacuum will be generated in the intake duct, i.e. the intake duct serves exclusively for the supply of air to the cylinders.
- This means that, in the new engine concepts, either the throttle valve is omitted or it is largely ineffective for producing a vacuum.
- As a result, a vacuum sufficient for operating power brake systems can no longer be generated in the intake duct.
- For this reason, even in motor vehicles having spark-ignition engines, the vacuum is produced sometimes by providing a suction pump as it is done in connection with diesel engines, in order to permit operation of the power brake system. Systems of this type are disclosed in DE-A 2 347 701 and WO 93/11983.
- However, it has so far not been possible in any of the above-described systems to satisfactorily use the pump in connection with the fuel-vapor-retaining systems arranged in motor vehicles.
- The object of the present invention is to provide an arrangement with which a power brake system and a fuel-retaining (fuel vapor adsorption) system can be operated by a vacuum generated by a pump wherein, at the same time, the fuel consumption is reduced and the amount of pollutants emitted are minimized.
- In an arrangement for producing a vacuum in a motor vehicle system including an internal combustion engine with an air intake system, a vacuum-operated power brake system for braking the vehicle and a fuel vapor adsorption system for collecting fuel vapors, a vacuum pump is provided which has a suction side in communication selectively with the vacuum operated power brake system and the fuel vapor adsorption system and a discharge side in communication with the air intake system of the internal combustion engine.
- With the arrangement according to the invention, a vacuum can be produced which is sufficient and always available for the operation of a power brake system and which is available over the entire operating range of an internal combustion engine. Moreover, efficient regeneration of a fuel-vapor-retaining system is made possible.
- Such a fuel-vapor-adsorption system can also be operated in the high load range or in the full load range of the engine. During high load operation, a high air mass flow is supplied to the engine so that a very efficient regeneration is possible. At the same time, the conversion of the fuel vapors in the engine is particularly effective because of better engine charge conditions. Also, with conventional throttle-controlled engines an insufficient vacuum is generated during high load engine operation for proper braking operation or for a proper regeneration of the fuel vapor adsorber.
- The activation of the power-brake system and the regeneration of the fuel vapor adsorber system can be achieved with a single pump. The air flow or air/fuel-vapor flow generated by the pump is introduced into the intake system of the internal combustion engine.
- Further advantages and embodiments of the invention will become apparent from the following description of the invention based on the accompanying drawing.
- The single FIGURE shows a circuit diagram of an arrangement for producing a vacuum in a motor vehicle in accordance with the invention.
- An arrangement1 for producing a vacuum in a motor-vehicle system comprises a
pump 2, which is connected at its suction side, via aline arrangement 3, to a pneumatic power brake system 4. In addition, an activated-carbon canister 5 of a fuel-vapor-adsorbingsystem 6, which is known per se and is in communication with afuel tank 27, is connected to theline arrangement 3 at the suction side of thepump 2. Thepump 2 is connected at its delivery side to an air-intake system 7 of aninternal combustion engine 8. - The
pump 2 is a suction pump driven preferably by anelectric motor 9. An encapsulated explosion-protecteddiaphragm pump 2 has been found to be particularly advantageous, since a diaphragm pump has no leakages and, at a high vacuum without gas flow, consumes only a small amount of power because the gas in the pump chamber acts as a pneumatic spring. - In another embodiment, the pump may be driven by the internal combustion engine via an electromagnetic clutch.
- During operation of the arrangement1, an explosive fuel/air mixture is pumped by the
diaphragm pump 2 from the activated-carbon canister 5 to theengine intake duct 7. The diaphragm pump 2 functions in a similar manner as a rubber-bellow system. It is not subject to leakage. No fuel/air mixture flowing from the activated-carbon canister 5 can escape into the surroundings on the suction side of thediaphragm pump 2. The same is true for the delivery side, since the fuel/air mixture conducted on this side of thediaphragm pump 2 is conveyed through the leak-proof line 23 to theintake system 7 and passes from there directly into theinternal combustion engine 8, where it is combusted. The engine shown here is a spark-ignition engine. - In contrast to other pumps, the
diaphragm pump 2 does not have a shaft extending through a housing wall so that no medium can escape. Such a pump has therefore exceptional explosion-proof properties. - The activated-
carbon canister 5 is provided withHC sensors 10, which are connected to anelectronic control unit 13 via signal lines 11. The HC-sensors 10 are provided for determining the charge of the activatedcarbon canister 5. The values determined are transmitted continuously to an electronic motor-control unit 13, which can be a conventional engine-control unit. - The power brake system4 is provided with a
pressure sensor 14, which is connected to theelectronic control unit 12 via asignal line 15 and which determines the pressure present in the power brake system 4. This value is transmitted to thecontrol unit 12 via thesignal line 15. - In the present exemplary embodiment, the
electronic control unit 12 is designed as a separate component of the device 1. However, it is of course within an expert's discretion to integrate theelectronic control unit 12 in a control unit, which is already present in the motor vehicle. This may be for example the electronic engine-control unit 13 of theinternal combustion engine 8. - A change-over valve designed as a spring-resetting 3/2-port
directional control valve 16 is arranged between thediaphragm pump 2, the activated-carbon canister 5 and the power brake system 4. Depending on its switching position, communication is established, via theline system 3, between thediaphragm pump 2 and the power brake system 4 or, by way of aline 17, between thepump 2 and the activated-carbon canister 5. - The
regenerating line 17 includes a pulsed fueltank vent valve 18 and extends between the 3/2-portdirectional control valve 16 and the activated-carbon canister 5. The 3/2-portdirectional control valve 16 and the fuel-tank vent valve 18 are in communication with theelectronic control unit 12 and the electronic engine-control unit 13 viasignal lines - In order to ensure reliable operation, a first
non-return valve 22 is arranged in theline 3 between the 3/2-portdirectional control valve 16 and the power brake system 4. If thediaphragm pump 2 breaks down, air is therefore prevented from flowing into the power brake system 4, and a vacuum present in the power brake system 4 can be maintained. - A throttle element (which is not illustrated as it is known per se) for controlling the amount of air supplied to the
internal combustion engine 8 is provided in theintake system 7. Aline 23 extends from thediaphragm pump 2 to theintake system 7 and is connected thereto upstream of the throttle element, in the direction of intake air flow. This arrangement ensures that the air evacuated from the power brake system 4 and the air/fuel vapor mixture from the activated-carbon canister are introduced into the intake air duct upstream of the throttle element or the throttle valve. In this way, introduction of air and air/fuel mixture into the intake pipe, which may be evacuated downstream of the throttle valve is avoided so that the throttling of theinternal combustion engine 8 cannot be circumvented. The outlay for the control arrangement of the engine is therefore not increased. - A
further line 24 of theline system 3 is provided between theintake system 7 and the power brake system 4. Thefurther line 24 is connected to theintake manifold 25 of theintake system 7 downstream of the throttle element. Thefurther line 24 permits a vacuum produced by a throttle element in theintake system 7 to be used additionally for the evacuation of the power brake system 4. However, the vacuum is only applied if it is greater than the vacuum, which can be produced by theelectric pump motor 9. Thepump motor 9 is switched on by thecontrol unit 22 when the vacuum in the power brake system becomes less than a predetermined value sufficient to safely operate the power brakes. - In order to avoid a back-flow of air/fuel mixture from the
intake system 7 into the power brake system 4, a secondnon-return valve 26 is provided in thefurther line 24. - During operation of the engine, the
diaphragm pump 2 is switched on as a function of the charge of the activatedcarbon canister 5 and/or of the negative pressure (vacuum) state of the power brake system 4. However, in this case the vacuum requirement of the power brake system 4 is the principal parameter for theelectronic control unit 12 because of vehicle safety consideration. This means that, when a pressure above a desired negative pressure is present in the power-brake system 4 that is the vacuum is less than the predetermined value, the 3/2-portdirectional control valve 16 is switched in such a manner that thediaphragm pump 2 and the power brake system 4 are in line connection and the latter is evacuated by thediaphragm pump 2. - The switching of the 3/2-port
directional control valve 16 takes place via theelectronic control unit 12 at an appropriate signal from thepressure sensor 14. For this action, the 3/2-portdirectional control valve 16 is de-energized so that, in this rest position of the 3/2-portdirectional control valve 16, the suction side of thediaphragm pump 2 is connected to the power brake system 4. It is therefore ensured that thevalve 16 is spring-biased to a position in which the vacuum for the power brake system 4 is provided when there is an electrical line interruption to the 3/2-portdirectional control valve 16. - The
fuel adsorbing system 6 is regenerated by switching of the 3/2-portdirectional control valve 16 depending on need. However, thevalve 16 can be switched over only when the power brake system 4 has a vacuum supply sufficient for safe operation of the brakes. - The activated
carbon canister 5 is regenerated depending on charge sensing means 10 disposed in the activated-carbon canister 5. For this purpose, thediaphragm pump 2 is activated and the 3/2-portdirectional control valve 16 is energized, whereby the connection between thediaphragm pump 2 and the activated-carbon canister 5 is established. As a result, an additional air/fuel mixture is supplied to theinternal combustion engine 8 resulting in a change of the lambda value of the exhaust gas. Based on the lambda value change, the regeneration procedure of the activated-carbon canister 5 is controlled by thecontrol unit 12 and the engine-control unit by a pulsing of the fuel-tank vent valve 18. - To ensure that the pump is switched on as much as possible only when needed particularly in order to keep the power consumption and the wear of the
diaphragm pump 2 to a minimum, the charge of the activatedcarbon canister 5 is evaluated by evaluation electronics of theelectronic control unit 12 using the signals from the HC-sensors 10 in the activated-carbon canister 5. Depending on this evaluation, thediaphragm pump 2 is switched on as required in order to regenerate the fuel-adsorbingsystem 6. - The fuel-
tank vent valve 18 is activated by a pulse-width-modulated activating signal of theelectronic unit 12, depending on the engine load and engine speed, when there is a sufficiently large vacuum in the regeneratingline 17 and the activated-carbon canister 5 has a sufficiently large charge to justify regeneration. - Since with the pump2 a virtually constant vacuum level is available, there is a precisely determinable characteristic curve available for controlling the flow volume through the fuel-
tank vent valve 18 as a function of the activating signal. As a result, the flow control is greatly simplified and the maximum allowable regenerating flow volume can be supplied to the engine so that operation of the pump is generally necessary only for short periods. - The fuel-
tank vent valve 18 is a valve, which can merely be opened and closed. Its opening cross-section cannot be varied. In order to control the flow volume from the activated-carbon canister 5 to theinternal combustion engine 8, it is necessary to provide a flow cross-section corresponding to the operating state of theinternal combustion engine 8 and the state of theadsorbing system 6. Since, however, the fuel-tank vent valve 18 can only be completely opened or closed, the opening and closing of the fuel-tank vent valve 18 is pulsed in order to simulate a variable opening cross-section. - The pulsing of the fuel-
tank vent valve 18 takes place via the pulse-width-modulated signal of thecontrol unit 12, which may, for example, be a square-wave signal recurring at a frequency of 10 Hz. The pulse width of the signal determines the energizing duration and therefore also the opening duration of the fuel-tank vent valve 18. Different pulse widths are therefore used to obtain different opening durations simulating a variable cross section of the fuel-tank vent valve 18. - When the activated-
carbon canister 5 is fully charged, the fuel-tank vent valve 18 is operated at a very small pulse ratio. When the activated-carbon canister 5 has a small charge, the fuel-tank vent valve 18 is operated at a large pulse ratio. Since a vacuum is constantly provided by thediaphragm pump 2, the pulse ratio depends on the charge of the activated-carbon canister 5 and on the air mass flow through theinternal combustion engine 8. - The arrangement for producing a vacuum in a motor vehicle system is particularly suitable for use in connection with spark-ignition engines. However, it may, of course, also be used in diesel engines or other internal combustion engines, specifically whenever a power brake system and a fuel adsorption system are to be supplied with a sufficient operating vacuum.
Claims (15)
1. An arrangement for producing a vacuum in a motor vehicle system including an internal combustion engine with an air intake system, a vacuum operated power brake system for braking said vehicle, a fuel vapor adsorption system for collecting fuel vapors and a pump having a suction side in communication selectively by a power brake vacuum line with said vacuum-operated power brake system and by a regeneration line with said fuel vapor adsorption system, and a discharge side in communication by a delivery line with the air intake system of said internal combustion engine.
2. An arrangement according to , wherein said pump is in electric motor driven suction pump.
claim 1
3. An arrangement according to , wherein said pump is driven by said internal combustion engine and a separating clutch is provided which can be activated electromagnetically.
claim 1
4. An arrangement according to , wherein said pump is an enclosed, explosion-protected diaphragm pump.
claim 1
5. An arrangement according to , wherein said fuel vapor adsorption system includes an activated-carbon canister provided with HC-sensors which are connected, by signal lines, to an electronic control unit.
claim 1
6. An arrangement according to , wherein said power brake system includes an electronic control unit, and a vacuum pressure sensor is provided in said power brake system and is connected, via a signal line, to said electronic control unit.
claim 5
7. An arrangement according to , wherein said electronic control unit is integrated in an electronic engine-control unit of said internal combustion engine.
claim 6
8. An arrangement according to , wherein a changeover valve is provided between the diaphragm pump section side and the fuel adsorption system and the power brake system for selectively connecting said power brake system and said fuel adsorption system to the pump section side, said changeover valve being a 3/2-port directional control valve, which is spring-biased to a position providing for the connection of said power brake system to said pump suction side.
claim 1
9. An arrangement according to , wherein a regenerating line extends between said 3/2-port directional control valve and said fuel adsorption system, said regenerating line including a pulsed fuel-tank vent valve for controlling the regeneration air flow volume to said engine.
claim 7
10. An arrangement according to , wherein said 3/2-port directional control valve and said fuel-tank vent valve are connected via signal lines to said electronic control unit and said electronic engine-control unit.
claim 9
11. An arrangement according to , wherein a first non-return valve is arranged in a vacuum line extending between said 3/2-port directional control valve and said power brake system.
claim 1
12. An arrangement according to , wherein a throttle element is provided in the intake system for regulating the amount of air supplied to said internal combustion engine and said delivery line between said diaphragm pump and said intake system is connected to said intake system upstream of an intake air throttle element disposed in the engine air intake duct.
claim 1
13. An arrangement according to , wherein a further vacuum line extends between the air intake duct downstream of said throttle element and the power brake system and a second non-return valve is provided in said further vacuum line.
claim 12
14. Method of controlling the arrangement for producing a vacuum according to , wherein, with a vacuum less than a predetermined value present in the power brake system, the 3/2-port directional control valve is switched in such a manner that the diaphragm pump suction side and the power brake system are in communication and the vacuum pump is operated.
claim 1
15. A method according to , wherein the fuel-tank vent valve is activated via a pulse-width-modulated activating signal of the control unit as a function of engine load and a predetermined charge of the fuel vapor adsorption system when a vacuum is present in said regeneration line.
claim 14
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10001060 | 2000-01-13 | ||
DE10001060A DE10001060C1 (en) | 2000-01-13 | 2000-01-13 | Negative pressure creating device for vehicle system has additional fuel vapor retention system on induction side of pump |
DE10001060.1 | 2000-01-13 |
Publications (2)
Publication Number | Publication Date |
---|---|
US20010011456A1 true US20010011456A1 (en) | 2001-08-09 |
US6412277B2 US6412277B2 (en) | 2002-07-02 |
Family
ID=7627327
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/760,207 Expired - Fee Related US6412277B2 (en) | 2000-01-13 | 2001-01-12 | Arrangement for producing a vacuum in a motor vehicle system |
Country Status (4)
Country | Link |
---|---|
US (1) | US6412277B2 (en) |
DE (1) | DE10001060C1 (en) |
FR (1) | FR2803810B1 (en) |
IT (1) | ITRM20010006A1 (en) |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090308359A1 (en) * | 2008-06-11 | 2009-12-17 | Gm Global Technology Operations, Inc. | Noise minimization for evaporative canister ventilation valve cleaning |
CN102330620A (en) * | 2010-05-28 | 2012-01-25 | 福特环球技术公司 | Method and system for fuel vapor control |
CN102330622A (en) * | 2010-07-07 | 2012-01-25 | 奥迪股份公司 | Ventilating device used for fuel tank and method used for operating ventilating device |
JP2012107590A (en) * | 2010-11-18 | 2012-06-07 | Mitsubishi Motors Corp | Leak detection apparatus of fuel-transpiration-gas processing device |
US20130081705A1 (en) * | 2011-09-29 | 2013-04-04 | Automotive Research & Testing Center | System for evacuating gas from a brake booster |
US20140041641A1 (en) * | 2012-08-10 | 2014-02-13 | Tula Technology, Inc. | Control of manifold vacuum in skip fire operation |
CN105545531A (en) * | 2014-10-24 | 2016-05-04 | 丰田自动车株式会社 | Vehicle |
CN105545532A (en) * | 2014-10-24 | 2016-05-04 | 丰田自动车株式会社 | Vehicle |
US20170008501A1 (en) * | 2013-12-19 | 2017-01-12 | Pierburg Pump Technology Gmbh | Motor vehicle assembly arrangement with an internal combustion engine and a switchable vacuum pump |
US9790867B2 (en) | 2012-07-31 | 2017-10-17 | Tula Technology, Inc. | Deceleration cylinder cut-off |
US10161402B2 (en) | 2013-12-19 | 2018-12-25 | Pierburg Pump Technology Gmbh | Motor vehicle vacuum pump having a switchable clutch |
US10167799B2 (en) | 2012-07-31 | 2019-01-01 | Tula Technology, Inc. | Deceleration cylinder cut-off in a hybrid vehicle |
US10408140B2 (en) | 2012-07-31 | 2019-09-10 | Tula Technology, Inc. | Engine control in fuel and/or cylinder cut off modes based on intake manifold pressure |
CN113404624A (en) * | 2021-07-23 | 2021-09-17 | 岚图汽车科技有限公司 | Fuel oil system active desorption device and automobile |
Families Citing this family (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002256986A (en) * | 2001-03-02 | 2002-09-11 | Denso Corp | Fuel vapor treating device |
JP3896588B2 (en) * | 2002-06-28 | 2007-03-22 | 株式会社デンソー | Eva Pollyk Check System |
DE10247936A1 (en) * | 2002-10-15 | 2004-04-29 | Daimlerchrysler Ag | Fuel supply system for an internal combustion engine |
JP4562191B2 (en) * | 2005-04-08 | 2010-10-13 | 株式会社デンソー | Fuel vapor treatment equipment |
CN100543290C (en) * | 2005-04-08 | 2009-09-23 | 株式会社电装 | Fuel vapor treatment apparatus |
DE102006004288A1 (en) * | 2006-01-31 | 2007-08-02 | Robert Bosch Gmbh | Low-pressure feeder device for a consumer/power brake in a motor vehicle has a source of low pressure for supplying the consumer with low pressure and a vacuum pump |
FR2916177B1 (en) * | 2007-05-16 | 2009-09-18 | Peugeot Citroen Automobiles Sa | VEHICLE BRAKE PUMP OF A MOTOR VEHICLE BRAKE SYSTEM WITH PNEUMATIC ASSISTANCE |
WO2009143597A1 (en) * | 2008-05-26 | 2009-12-03 | Nino Mario De Santis | Dual h20 engine recycling system |
US7966996B1 (en) * | 2010-03-03 | 2011-06-28 | Ford Global Technologies, Llc | Vacuum supply system |
US8447495B2 (en) | 2010-05-28 | 2013-05-21 | Ford Global Technologies, Llc | Method and system for fuel vapor control |
US8019525B2 (en) | 2010-05-28 | 2011-09-13 | Ford Global Technologies, Llc | Method and system for fuel vapor control |
US20120260624A1 (en) * | 2010-07-08 | 2012-10-18 | Cleanfuel Holdings, Inc. | System and Method for Controlling Evaporative Emissions |
US9027343B2 (en) * | 2012-06-14 | 2015-05-12 | Ford Global Technologies, Llc | Approach for supplying vacuum via a supercharger |
DE102012218933A1 (en) | 2012-10-17 | 2014-04-17 | Robert Bosch Gmbh | Method for determining the loading of activated carbon filter in tank ventilation system for fuel tank of combustion engine used in motor car, involves closing activated carbon filter on load state based on the measured pressure values |
FR3007468B1 (en) * | 2013-06-21 | 2015-07-03 | Peugeot Citroen Automobiles Sa | ASSEMBLY FOR INTERNAL COMBUSTION ENGINE |
FR3007467B1 (en) * | 2013-06-21 | 2015-07-03 | Peugeot Citroen Automobiles Sa | ASSEMBLY FOR INTERNAL COMBUSTION ENGINE |
DE102013224301A1 (en) * | 2013-11-27 | 2015-05-28 | Robert Bosch Gmbh | Apparatus and method for determining the loading of a fuel vapor accumulator of an internal combustion engine |
JP6392113B2 (en) * | 2014-12-25 | 2018-09-19 | 愛三工業株式会社 | Evaporative fuel processing equipment |
CN105134422B (en) * | 2015-08-20 | 2018-01-23 | 浙江吉利汽车研究院有限公司 | Vehicle-mounted oil filling gas recovery system for oil and there is its automobile |
US11549455B2 (en) | 2019-04-08 | 2023-01-10 | Tula Technology, Inc. | Skip cylinder compression braking |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3768366A (en) * | 1972-10-02 | 1973-10-30 | Bendix Corp | Selective pressure differential reinforcing means |
DE2945488A1 (en) * | 1979-11-10 | 1981-05-21 | Barmag Barmer Maschf | Vacuum pump for vehicle brakes - has rotor of sintered alloyed aluminium for light weight |
US4328669A (en) * | 1980-02-15 | 1982-05-11 | General Motors Corporation | Vacuum power system and regulator therefor |
JPS58110853A (en) * | 1981-12-25 | 1983-07-01 | Honda Motor Co Ltd | Vaporized fuel controlling apparatus for internal-combustion engine with supercharger |
DE3322176A1 (en) * | 1983-06-21 | 1985-01-10 | Alfred Dipl.-Ing.(FH) 7257 Ditzingen Wieland | Vacuum system for a motor vehicle |
US4783962A (en) * | 1985-01-18 | 1988-11-15 | General Motors Coporation | Brake booster vapor trap filter and fuel tank vapor trap canister vapor guard system |
EP0616579B1 (en) * | 1991-12-18 | 1996-06-05 | Wabco Automotive U.K. Limited | Vacuum pump motor control apparatus and method of operation thereof |
DE19513822C2 (en) * | 1995-04-12 | 1999-10-28 | Volkswagen Ag | Device for delivering fuel from a storage tank to an internal combustion engine of a motor vehicle |
DE19650517C2 (en) * | 1996-12-05 | 2003-05-08 | Siemens Ag | Method and device for tank ventilation for a direct-injection internal combustion engine |
US5970957A (en) * | 1998-03-05 | 1999-10-26 | Ford Global Technologies, Inc. | Vapor recovery system |
DE19927468A1 (en) * | 1999-06-16 | 2000-12-21 | Volkswagen Ag | Device for delivering fuel in motor vehicles with internal combustion engines includes a vacuum system for power brakes linking up an intake hose connected to an intake valve and a fuel intake line linked to a fuel delivery line. |
-
2000
- 2000-01-13 DE DE10001060A patent/DE10001060C1/en not_active Expired - Fee Related
-
2001
- 2001-01-08 FR FR0100165A patent/FR2803810B1/en not_active Expired - Fee Related
- 2001-01-10 IT IT2001RM000006A patent/ITRM20010006A1/en unknown
- 2001-01-12 US US09/760,207 patent/US6412277B2/en not_active Expired - Fee Related
Cited By (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7950375B2 (en) * | 2008-06-11 | 2011-05-31 | GM Global Technology Operations LLC | Noise minimization for evaporative canister ventilation valve cleaning |
US20090308359A1 (en) * | 2008-06-11 | 2009-12-17 | Gm Global Technology Operations, Inc. | Noise minimization for evaporative canister ventilation valve cleaning |
CN102330620A (en) * | 2010-05-28 | 2012-01-25 | 福特环球技术公司 | Method and system for fuel vapor control |
CN102330622A (en) * | 2010-07-07 | 2012-01-25 | 奥迪股份公司 | Ventilating device used for fuel tank and method used for operating ventilating device |
JP2012107590A (en) * | 2010-11-18 | 2012-06-07 | Mitsubishi Motors Corp | Leak detection apparatus of fuel-transpiration-gas processing device |
US8672420B2 (en) * | 2011-09-29 | 2014-03-18 | Automotive Research & Testing Center | System for evacuating gas from a brake booster |
US20130081705A1 (en) * | 2011-09-29 | 2013-04-04 | Automotive Research & Testing Center | System for evacuating gas from a brake booster |
US11352966B2 (en) | 2012-07-31 | 2022-06-07 | Tula Technology, Inc. | Deceleration cylinder cut-off |
US9790867B2 (en) | 2012-07-31 | 2017-10-17 | Tula Technology, Inc. | Deceleration cylinder cut-off |
US10900425B2 (en) | 2012-07-31 | 2021-01-26 | Tula Technology, Inc. | Engine diagnostics during cylinder cut off operation |
US10408140B2 (en) | 2012-07-31 | 2019-09-10 | Tula Technology, Inc. | Engine control in fuel and/or cylinder cut off modes based on intake manifold pressure |
US10167799B2 (en) | 2012-07-31 | 2019-01-01 | Tula Technology, Inc. | Deceleration cylinder cut-off in a hybrid vehicle |
US9273643B2 (en) * | 2012-08-10 | 2016-03-01 | Tula Technology, Inc. | Control of manifold vacuum in skip fire operation |
US20140041641A1 (en) * | 2012-08-10 | 2014-02-13 | Tula Technology, Inc. | Control of manifold vacuum in skip fire operation |
US9919692B2 (en) * | 2013-12-19 | 2018-03-20 | Pierburg Pump Technology Gmbh | Motor vehicle assembly arrangement with an internal combustion engine and a switchable vacuum pump |
US20170008501A1 (en) * | 2013-12-19 | 2017-01-12 | Pierburg Pump Technology Gmbh | Motor vehicle assembly arrangement with an internal combustion engine and a switchable vacuum pump |
US10161402B2 (en) | 2013-12-19 | 2018-12-25 | Pierburg Pump Technology Gmbh | Motor vehicle vacuum pump having a switchable clutch |
JP2016084742A (en) * | 2014-10-24 | 2016-05-19 | トヨタ自動車株式会社 | vehicle |
JP2016084741A (en) * | 2014-10-24 | 2016-05-19 | トヨタ自動車株式会社 | Control device of vehicle |
CN105545532A (en) * | 2014-10-24 | 2016-05-04 | 丰田自动车株式会社 | Vehicle |
CN105545531A (en) * | 2014-10-24 | 2016-05-04 | 丰田自动车株式会社 | Vehicle |
CN113404624A (en) * | 2021-07-23 | 2021-09-17 | 岚图汽车科技有限公司 | Fuel oil system active desorption device and automobile |
Also Published As
Publication number | Publication date |
---|---|
ITRM20010006A0 (en) | 2001-01-10 |
FR2803810B1 (en) | 2006-01-21 |
DE10001060C1 (en) | 2001-07-26 |
FR2803810A1 (en) | 2001-07-20 |
US6412277B2 (en) | 2002-07-02 |
ITRM20010006A1 (en) | 2002-07-10 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US6412277B2 (en) | Arrangement for producing a vacuum in a motor vehicle system | |
JP3477061B2 (en) | Brake booster negative pressure control device | |
US5273020A (en) | Fuel vapor purging control system for automotive vehicle | |
CN104691528B (en) | Vacuum removing in hybrid vehicle | |
US10746137B2 (en) | Tank venting system for an internal combustion engine and method for regenerating a sorption reservoir | |
JP3589632B2 (en) | Evaporative gas exhaust device for low engine intake system vacuum | |
US20050011185A1 (en) | Apparatus for reducing hydrocarbon emission of internal combustion engine | |
US4192278A (en) | Internal combustion engine for motor vehicle | |
CN105422293A (en) | Methods and systems for a throttle turbine generator | |
JP3267088B2 (en) | Evaporative fuel treatment system for internal combustion engine | |
EP0809009B1 (en) | Apparatus for controlling diesel engine | |
JPH09112315A (en) | Method and equipment for controlling idling of internal combustion engine | |
JP3156470B2 (en) | Internal combustion engine with exhaust brake | |
KR100507186B1 (en) | Apparatus for decreasing idle speed of engine in automobile | |
JP3972387B2 (en) | Negative pressure supply system for automobiles | |
KR100305795B1 (en) | Intake air control device for vehicle | |
KR200191651Y1 (en) | Variable intake system for an automobile | |
KR19990008357U (en) | Exhaust brake device | |
JPS59120771A (en) | Exhaust gas recirculation control method of diesel engine | |
KR100211359B1 (en) | Intake device for auto cars | |
KR100204777B1 (en) | Air intake duct of engine in a car | |
KR20230124174A (en) | Canister module for vehicle | |
KR100293541B1 (en) | Apparatus for controlling suction amount | |
KR20240104683A (en) | Method for Venting with Purging Control using Active Purge System | |
KR100302712B1 (en) | Throttle system for automobile |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: DAIMLERCHRYSLER AG, GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:HAGEN, AUREL;KLEIN, PETER;MAUZ, LOTHAR;AND OTHERS;REEL/FRAME:011670/0378 Effective date: 20010130 |
|
REMI | Maintenance fee reminder mailed | ||
LAPS | Lapse for failure to pay maintenance fees | ||
STCH | Information on status: patent discontinuation |
Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |
|
FP | Lapsed due to failure to pay maintenance fee |
Effective date: 20060702 |