US3763974A - Manifold vacuum control for power brakes - Google Patents

Manifold vacuum control for power brakes Download PDF

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Publication number
US3763974A
US3763974A US00251387A US3763974DA US3763974A US 3763974 A US3763974 A US 3763974A US 00251387 A US00251387 A US 00251387A US 3763974D A US3763974D A US 3763974DA US 3763974 A US3763974 A US 3763974A
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United States
Prior art keywords
intake manifold
brake pedal
valve
depression
servo
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Expired - Lifetime
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US00251387A
Inventor
E Neal
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CONVENTRY CLIMAX ENG Ltd
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CONVENTRY CLIMAX ENG Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60TVEHICLE 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
    • B60T11/00Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant
    • B60T11/10Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting by fluid means, e.g. hydraulic
    • B60T11/103Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting by fluid means, e.g. hydraulic in combination with other control devices
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60TVEHICLE 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
    • B60T13/00Transmitting 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
    • B60T13/10Transmitting 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
    • B60T13/24Transmitting 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
    • B60T13/46Vacuum systems
    • B60T13/52Vacuum systems indirect, i.e. vacuum booster units
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B1/00Engines characterised by fuel-air mixture compression
    • F02B1/02Engines characterised by fuel-air mixture compression with positive ignition
    • F02B1/04Engines characterised by fuel-air mixture compression with positive ignition with fuel-air mixture admission into cylinder

Definitions

  • ABSTRACT A vehicle having a diesel engine with a fuel supply controlled other than in dependence upon thepressure in the air intake manifold, and a servo assisted braking system the servo unit of which is connected directly to the intake manifold and is activated for application of the brakes by pressure reduction in the intake manifold upon actuation of :a choke valve which throttles the air entering the intake manifold. Depression of a brake pedal will close the valve, the depression of an accelerator pedal will force the valve open regardless of the brake pedal position.
  • a vehicle has a diesel engine with a fuel supply controlled other than in dependence upon the pressure in the air intake manifold, and a servo assisted braking system the servo unit of which is connected directly to the intake manifold and is activated for application of the brakes by a depression in the intake manifold upon actuation of a choke valve which throttles the air entering the intake manifold.
  • the choke valve may be a butterfly valve and may be actuated, for example, by movement or loading of the brake foot pedal or linkage, or through a linkage with the accelerator controls.
  • FIG. I shows a choke valve operated by a vehicle accelerator pedal
  • FIG. 2 shows a choke valve operated by a vehicle brake pedal
  • FIG. 3 shows the operation of a brake pedal operated choke having an accelerator override
  • FIGS. 3a, 3b and 3c show the operation of the choke of FIG. 3 with the two pedals at different positions.
  • FIG. 1 shows a vehicle diesel engine 1 having an airintake 2 in which a butterfly valve 3 is positioned.
  • the valve 3 is operated to restrict the air-intake by an accelerator pedal 4, to which the valve is attached by a rigid linkage 5,5.
  • the linkage 5,5 is such that the valve 3 is closed," that is in its maximum throttling position, when the accelerator pedal 4 is in the idle" position, that is when the engine isjust idling.
  • a brake servo unit 6 is connected directly through a conduit 7 into the airintake manifoldbetween the valve 3 and the engine 1.
  • Closure of the valve 3 upon release of the accelerator pedal reduces the pressure by up to 27 inches of mercury on the engine side of the valve and thus provides to the unit 6 the vacuum necessary for the servo operation of the brakes of the vehicle, under the control of a separate brake pedal (not shown).
  • FIG. 2 shows a system in which a brake pedal 8 is connected via a rigid linkage 9,5 so that depression of the brake pedal 8 to applythe brakes closes the valve 3 thus simultaneously activating the brake servo 6.
  • FIG. 3 a system is shown which is similar to that in FIG. 2, but it also has an accelerator override.
  • the rigid brake pedal linkage 9 is attached at one end to the lever 5' which operates the valve 3, and at the other end is attached by a spring connection 10 to the brake pedal 8.
  • the rigid accelerator linkage 5 is attached at one end to the accelerator pedal 4 and at the other end to a slotted link 11 which is slidable on link pin 12 on the lever 5'.
  • the configuration shown in FIG. 3 is the case in which neither the brake pedal 8 nor accelerator pedal 4 are in use, the valve 3 is therefore open and thus the servo 6 is only activated under a low vacuum.
  • FIG. 3a shows the footbrake 8 in use, the linkage 9 causing the valve 3 to be closed thereby fully activating the servo.
  • the engine is just idling, the accelerator 4 being unused.
  • FIG. 3b the accelerator 4 is in operation, the engine thereby being at speed, and the footbrake 8 is not in use.
  • the valve 3 remains open and there is unrestricted air-flow to the engine.
  • FIG. 30 shows the accelerator override in operation.
  • the footbrake 8 is in use, but power is required of the engine, for example to drive a subsidiary function such as a load lifting mechanism, and so the accelerator 4 is also in use.
  • the use of the accelerator 4 maintains the valve 3 open or partially open and thus the spring 10 is compressed by movement of the linkage 9.
  • the vacuum applied to the brake servo 6 will be small but still sufficient to hold the vehicle stationary on the footbrake.
  • a servo unit of said braking system is connected directly to said air intake manifold and activated for application of the brakes by a depression in said intake manifold,
  • said brake pedal and accelerator control are connected to said choke valve by linkages such that, while actuation of said brake pedal will close said choke valve to create a depression in said manifold when said accelerator control is in its'idle position, the actuation of said accelerator control will open said choke valve,

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)

Abstract

A vehicle having a diesel engine with a fuel supply controlled other than in dependence upon the pressure in the air intake manifold, and a servo assisted braking system the servo unit of which is connected directly to the intake manifold and is activated for application of the brakes by pressure reduction in the intake manifold upon actuation of a choke valve which throttles the air entering the intake manifold. Depression of a brake pedal will close the valve, the depression of an accelerator pedal will force the valve open regardless of the brake pedal position.

Description

United States Patent [1 Neal [ Oct. 9, 1973 MANIFOLD VACUUM CONTROL FOR POWER BRAKES [75] Inventor: Eric R. Neal, Coventry, England [73] l Assignee: Conventry Climax Engines Limited,
Warwickshire, England 22' Filed: May 8,1972
21 Appl. No.: 251,387
[52] US. Cl 192/3 R, 192/3 TR, 123/140 MP,
123/97, 60/14, 188/356 [51] Int. Cl. B601: 29/00 [58] Field of Search 192/3 R, l, 3 TR [56] References Cited UNITED STATES PATENTS 2,949,732 8/ 1960 Schroeder 60/14 1,879,719 9/1932 Stewart t 192/3 R 2,539,994 1/1951 Engler 192/3 R X FOREIGN PATENTS OR APPLICATIONS 292,276 10/1953 Switzerland 192/3 R 308,680 5/1930 Great Britain 192/3 R Primary Examiner-Benjamin W. Wyche Attamey-Joseph F. Brisebois et al.
[57] ABSTRACT A vehicle having a diesel engine with a fuel supply controlled other than in dependence upon thepressure in the air intake manifold, and a servo assisted braking system the servo unit of which is connected directly to the intake manifold and is activated for application of the brakes by pressure reduction in the intake manifold upon actuation of :a choke valve which throttles the air entering the intake manifold. Depression of a brake pedal will close the valve, the depression of an accelerator pedal will force the valve open regardless of the brake pedal position.
1 Claim, 6 Drawing Figures BRAKES It is often required that the braking system of a vehicle be servo-assisted to reduce pedal efforts. Such servo systems are operated by a partial vacuum.
When the vehicle has a petrol engine it is normal practice to use the intake manifold depression to provide the depression required by the servo unit. In the case of diesel engined vehicles, the normal practice is to fit a separate exhaust pump to provide the vacuum necessary to operate the servo unit. The reason for this is that until recent years the fuel injection systems on most vehicle diesel engines have been governed by depression at a venturi in the air intake system, and in such circumstances requirements for fuel supply and brake operation are incompatible. Also the combustion system of the diesel engine is such that maximum intake of air is necessary for efficient working when power is required, irrespective of whether the fuel is controlled by the air intake manifold conditions or not. However in most modern diesel engines the fuel supply is controlled by governers that are divorced from the air intake system.
In accordance with the present invention a vehicle has a diesel engine with a fuel supply controlled other than in dependence upon the pressure in the air intake manifold, and a servo assisted braking system the servo unit of which is connected directly to the intake manifold and is activated for application of the brakes by a depression in the intake manifold upon actuation of a choke valve which throttles the air entering the intake manifold.
With this arrangement no separate exhaust pump is necessary and the required depression for operating the servo unit is created when required in the intake manifold by throttling the air intake.
The choke valve may be a butterfly valve and may be actuated, for example, by movement or loading of the brake foot pedal or linkage, or through a linkage with the accelerator controls.
Three examples of brake servo systems in accor dance with the present invention will now be described with reference to the accompanying drawings, in which:
FIG. I shows a choke valve operated by a vehicle accelerator pedal;
FIG. 2 shows a choke valve operated by a vehicle brake pedal;
FIG. 3 shows the operation of a brake pedal operated choke having an accelerator override; and
FIGS. 3a, 3b and 3c show the operation of the choke of FIG. 3 with the two pedals at different positions.
FIG. 1 shows a vehicle diesel engine 1 having an airintake 2 in which a butterfly valve 3 is positioned. The valve 3 is operated to restrict the air-intake by an accelerator pedal 4, to which the valve is attached by a rigid linkage 5,5. The linkage 5,5 is such that the valve 3 is closed," that is in its maximum throttling position, when the accelerator pedal 4 is in the idle" position, that is when the engine isjust idling. A brake servo unit 6 is connected directly through a conduit 7 into the airintake manifoldbetween the valve 3 and the engine 1. Closure of the valve 3 upon release of the accelerator pedal reduces the pressure by up to 27 inches of mercury on the engine side of the valve and thus provides to the unit 6 the vacuum necessary for the servo operation of the brakes of the vehicle, under the control of a separate brake pedal (not shown).
FIG. 2 shows a system in which a brake pedal 8 is connected via a rigid linkage 9,5 so that depression of the brake pedal 8 to applythe brakes closes the valve 3 thus simultaneously activating the brake servo 6.
In FIG. 3 a system is shown which is similar to that in FIG. 2, but it also has an accelerator override. The rigid brake pedal linkage 9 is attached at one end to the lever 5' which operates the valve 3, and at the other end is attached by a spring connection 10 to the brake pedal 8. The rigid accelerator linkage 5 is attached at one end to the accelerator pedal 4 and at the other end to a slotted link 11 which is slidable on link pin 12 on the lever 5'.
The configuration shown in FIG. 3 is the case in which neither the brake pedal 8 nor accelerator pedal 4 are in use, the valve 3 is therefore open and thus the servo 6 is only activated under a low vacuum.
FIG. 3a shows the footbrake 8 in use, the linkage 9 causing the valve 3 to be closed thereby fully activating the servo. In this case the engine is just idling, the accelerator 4 being unused.
In FIG. 3b the accelerator 4 is in operation, the engine thereby being at speed, and the footbrake 8 is not in use. The valve 3 remains open and there is unrestricted air-flow to the engine.
FIG. 30 shows the accelerator override in operation. The footbrake 8 is in use, but power is required of the engine, for example to drive a subsidiary function such as a load lifting mechanism, and so the accelerator 4 is also in use. The use of the accelerator 4 maintains the valve 3 open or partially open and thus the spring 10 is compressed by movement of the linkage 9. The vacuum applied to the brake servo 6 will be small but still sufficient to hold the vehicle stationary on the footbrake.
I claim:
1. In a vehicle engine having an air intake manifold, a choke valve which throttles the air entering said intake manifold, fuel supply control means independent of the pressure in said air intake manifold, a servo assisted braking system, a brake pedal, and an accelerator control, the improvement according to which a servo unit of said braking system is connected directly to said air intake manifold and activated for application of the brakes by a depression in said intake manifold,
and said brake pedal and accelerator control are connected to said choke valve by linkages such that, while actuation of said brake pedal will close said choke valve to create a depression in said manifold when said accelerator control is in its'idle position, the actuation of said accelerator control will open said choke valve,
regardless of the position of said brake pedal.
- UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION 3,7 3,97 Dated 9 October 1973 Patent No.
Inventor( R. It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:
Foreign Application Priority Data May 12, 1971 Great Britain.. ..1 l 491/7l Signed and sealed this 16th day of April 1971;.
(SEAL) Attest: I
EDWARD I LFLETCHERJR. C. MARSHALL DA'NN Attesting Officer- Commissioner of Patents )RM PO-IOSO (10-69) USCOMM-DC 60876-P59 1i U.S. GOVERNMENT PRINTING OFFICE I," 0566 -33},

Claims (1)

1. In a vehicle engine having an air intake manifold, a choke valve which throttles the air entering said intake manifold, fuel supply control means independent of the pressure in said air intake manifold, a servo assisted braking system, a brake pedal, and an accelerator control, the improvement according to which a servo unit of said braking system is connected directly to said air intake manifold and activated for application of the brakes by a depression in said intake manifold, and said brake pedal and accelerator control are connected to said choke valve by linkages such that, while actuation of said brake pedal will close said choke valve to create a depression in said manifold when said accelerator control is in its idle position, the actuation of said accelerator control will open said choke valve, regardless of the position of said brake pedal.
US00251387A 1971-05-12 1972-05-08 Manifold vacuum control for power brakes Expired - Lifetime US3763974A (en)

Applications Claiming Priority (1)

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GB1449171A GB1388671A (en) 1971-05-12 1971-05-12 Vehicle controls

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US3763974A true US3763974A (en) 1973-10-09

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US00251387A Expired - Lifetime US3763974A (en) 1971-05-12 1972-05-08 Manifold vacuum control for power brakes

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GB (1) GB1388671A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4899708A (en) * 1987-11-25 1990-02-13 Alfred Teves Gmbh Vacuum-generating device
US6223716B1 (en) 1998-04-16 2001-05-01 Mitsubishi Denki Kabushiki Kaisha Fuel control system for cylinder injection type internal combustion engine
US20110183812A1 (en) * 2010-08-24 2011-07-28 Ford Global Technologies, Llc Method and system for controlling engine air

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19647092B4 (en) * 1996-11-14 2016-02-25 Robert Bosch Gmbh Engine control method

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4899708A (en) * 1987-11-25 1990-02-13 Alfred Teves Gmbh Vacuum-generating device
US6223716B1 (en) 1998-04-16 2001-05-01 Mitsubishi Denki Kabushiki Kaisha Fuel control system for cylinder injection type internal combustion engine
US20110183812A1 (en) * 2010-08-24 2011-07-28 Ford Global Technologies, Llc Method and system for controlling engine air
US8343011B2 (en) * 2010-08-24 2013-01-01 Ford Global Technologies, Llc Method and system for controlling engine air
US8821349B2 (en) 2010-08-24 2014-09-02 Ford Global Technologies, Llc Method and system for controlling engine air

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Publication number Publication date
FR2137707A1 (en) 1972-12-29
FR2137707B1 (en) 1976-08-06
GB1388671A (en) 1975-03-26
DE2223168A1 (en) 1972-11-30

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