CA1040052A - Pilot operated regulator valve - Google Patents
Pilot operated regulator valveInfo
- Publication number
- CA1040052A CA1040052A CA250,665A CA250665A CA1040052A CA 1040052 A CA1040052 A CA 1040052A CA 250665 A CA250665 A CA 250665A CA 1040052 A CA1040052 A CA 1040052A
- Authority
- CA
- Canada
- Prior art keywords
- valve
- valve member
- pressure
- port
- ports
- 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.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/02—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used
- F16H61/0262—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being hydraulic
- F16H61/0276—Elements specially adapted for hydraulic control units, e.g. valves
- F16H61/029—Throttle valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D11/00—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated
- F02D11/06—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Safety Valves (AREA)
- Fluid-Driven Valves (AREA)
- Control Of Transmission Device (AREA)
Abstract
ABSTRACT
A valve mechanism adapted to produce a pressure which varies directly with the position of a mechanical member comprising a valve member having a control member movable within the valve member. The valve member is hollow and is movable in a bore having pressure inlet, outlet and regulating ports, the inlet port being connected to a source of pressure. The control member is movable within a bore in the valve member. The valve member has a plurality of ports communicating with the ports in the bore and a spring urges the valve member in one direction.
The valve member has a differential land area thereon connected to the regulating port and thereby the outlet port and which urges the valve member in a direction in opposition to the spring in response to fluid pressure in the regulating port wherein the valve member will respond to the position of the control member when the control member establishes a connection between the inlet and outlet ports through the ports in the valve member whereby movement of said control member will be followed by said valve member and a pressure will be produced in said outlet port varying directly with movement of the control member.
A valve mechanism adapted to produce a pressure which varies directly with the position of a mechanical member comprising a valve member having a control member movable within the valve member. The valve member is hollow and is movable in a bore having pressure inlet, outlet and regulating ports, the inlet port being connected to a source of pressure. The control member is movable within a bore in the valve member. The valve member has a plurality of ports communicating with the ports in the bore and a spring urges the valve member in one direction.
The valve member has a differential land area thereon connected to the regulating port and thereby the outlet port and which urges the valve member in a direction in opposition to the spring in response to fluid pressure in the regulating port wherein the valve member will respond to the position of the control member when the control member establishes a connection between the inlet and outlet ports through the ports in the valve member whereby movement of said control member will be followed by said valve member and a pressure will be produced in said outlet port varying directly with movement of the control member.
Description
-ol ~4~ 2 This invention relates to an improved regula~or valve particularly for use in a transmission mechanism.
It h~s been found that in connection with modern engines for vehicles complex lin~ages and complex carburetion dev~ces are employed inducing forces resisting movement of -the throttle pedal of significant value, making it important that additional forces not be introduced in the linkage system.
In addition, it has been found that with modern vehicles the commonly used manifold vacuum pressure signal is no longer as reliable due to the type of controls placed on the engine today such that direct mechanical linkages are now desirable for operating the throttle valve within a hydraulic control system for a transmission~ With known direct operating throttle valves, a significant amount of force is required as the valve responds to movement of the throttle pedal and in particular at the heavy throttle or nearly full depressed throttle positions a rather large amount of force is required to move the throttle pedal.
The present invention overcomes the above difficulties in a throttle valve mechanism in that a pilot operating throttle valve is utilized wherein the forces added to the throttle linkage to enable the throttle valve to respond to movement thereof may be substantially zero since only a pilot valve member is connected to be moved by the throttle pedal. A
movable valve member is provided within the throttle valve ~hich has a control valve member`movable therein and the movable valve member follows movement thereof. A differential area is provided on the movable valve member responsive to --I ~
~` .
:~40~SZ
fluid pressure and a spring is provided opposing force developed by the differential area. The spring and differential area forces are imposed only on the movable valve member and are not imposed on the linkage mechanism connected to the throttle pedal. In addition, the invention carries out the construction in a very simple manner providing a hollow movable valve member having slidable therewithin a pilot valve control member connected to the throttle mechanism. The valve member is mounted in a bore having a pressure inlet, pressure outlet and regulating ports. The inlet port is connected to a source of fluid pressure, and the valve member has a plurality of ports communicating with the ports in the bore. The control member has means therein adapted to establish a connection between the inlet port and the outlet port through the ports in the valve member. The outlet port being , connected to the regulating port so that movement of the control member will be followed by the valve member to produce a pressure in the outlet port which varies with the position of a control member and therefore,,the position of the throttle mechanism.
The single FIGURE of the drawings is a schematic illustration of a valve embodying the principles of the present invention.
Referring to the drawing, the regulating valve 10 of the present invention is adapted to cooperate in a trans-mission control system with a source of fluid pressure 12, . ~ .
~q~4~ 5;~:
a primary regulator valve 14 and a hydraulic control system 16, In general, the ~unction of the valve 10 is to provide .
a signal to the transmission hyaraulic control system 16 which varies with movement of a control member of the engine, such as the throttle. By way of example, the invention is illustrated as a throttle valve for the control system. As manufactured and used the valve 10 would be within and a part of the hydraulic control system 16.
The source 12 supplies--pressure to primary regulator valve 14 which regulates such pressure and supplies such regulated pressure to a conduit 20, which is connected to the hydraulic control system 16 and to valve 10. The valve 10 develops a regulated pressure which varies directly ~ith the position of the throttle and supplies same to a conduit 22, which connects to the regulator valve 1~ to influence the primary regulator valve in accordance with known practice in the transmission hydraulic control system art, to control other unctions within the transmission such as the points at Which ratio changes take place in the transmission. The.
valve 10 is generally comprised of a bore 26 formed within a section 28 of a valve body for the hydraulic control system.
The bore 26 has slidable therewithin a movable valve member 30, The valve member 30 has a bore 32 therein which is adapted to receive a movable control member 34.
A very light spring 35 engages member 34 and urges same to the left as viewed in the drawing. Within the bore 26, a spring 36 is provided urging valve member 30 to the left, as v;`.ewed in the drawing, against a stop 38 connected to the valve section 28. Spring 36 is confined in bore 26 by a .
stop 39. A throttle cam 40 is provided, which is connected by linkage member 42 to be moved by a throttle pedal 44 for the vehicle. The li~kage illustrated is schematic only and is only a sample of types of linkages which may be used.
In general, as the throttle 44 is depressed, linkage 42 will move to the right and rotate cam 40 about the pivot 46.
The cam has a control surface'4~ thereon to engage the movable member 3~ and move same to the right as the throttle is depressed.
The valve member 30 has ports 50,52 and 54 therein.
~he movable control member 34 has an elongated groove 56 therein. The valve member 30 includes lands 60, 62, 64 and 66. A large land 68 is also provided on the right hand end thereof which slides within an enlarged diameter section 70 of the bore 28. The bore 28 includes ports 72, 74, 76 ~nd 78.
Port 72 is an exhaust port which will be connected to the sump for the transmission control system. Port 74 is an output port which is adapted to contain the product of the valve 10 and is connected to the output conduit 22.
Port 76 is the pressure inlet port connected to the conduit 20 having regulated fluid pressure therein. Port 78 is a regulating port, this port being connected -to the pressure within the conduit 22. Pressure in port 78 is communicated to the differential area between lands 66 and 68 and creates orce on movable member 30 tending to move same to the right, compressing the spring 36.
~4()(~S2 ~ s is known in the art, the operation of a regulating valve system is such that pressure in the output port 74 is communicated to a differential land area which develops a force in opposition to the force of a spring, such as spring 36, and thus a regulated pressure is provided in the conduit 22. In the present invention it will be seen that as the control member 34 moves to the right, assumlng the valve is at rest as illustrated in FIGURE 1, a communication will be opened up by the groove 56 communicating.the port 54 of valve member 30 with port 52, As this happens, pressure in port 52 will be communicated through port 74 and port 78 to act on khe differential land area between lands 66 and 68, and the valve member 30 will move to the.right a sufficient extent to interrupt the connection made by groove 56 and the relative positions of valve member 30 and member 34 are as illustrated in FIGURE 1 once again. However, each of the members 30 and 3~ have been moved to the right as the throttle is depressed, As members 30 and 34 assume an equilibrium position to the right of that illustra-ted in FIGURE i, the spring 36 becomes more compressed and creates additional force on valve member 30 and thus an increased regulated pressure is provided in conduit 22.
As will be apparent from the above description, as the throttle 44 is depressed rotating cam 40, and control member 34 is moved to the right against the force o the very light spring 35, it will be seen that due to the pilot operation, there are no forces on control member 34 e~cept for the very small force of the spring 35. Thus, a regulating valve has been provided which can be adapted to 1~4V1~52 respond to the throttle position as described above and wherein substantially no additional force is;required to be transmitted through the linkage between the throttle and the carburetor to operate the regulating valve 10.
As described above, this is important in that in more modern vehicles where it is desirable that a mechanical connection between the throttle and throttle valve be provided, due to the increasing complexity of carburetors and throttle linkages being used with engines, the forces resisting movement of pedal 44 are significant to an extent to make operation of pedal 44 uncomfortable to the operator of the vehicle. As described above, the present invention over-comes this problem by providing a pilot operation so that the movement o~ control member 3~ requires extremely small force.
. Although the valve 10 is described as used in conjunction with a throttle for a vehicle engine to produce a regulated throttle pressure varying with throttlè position for a hydraulic control system 16, it should be apparent that the unique regulating valve 10 can be used in connection with many other control functions wherein a pressure is desired which varies directly with the position of a movable member such as cam member ~0. Thus, the utility of the described improved pilot operated regulator valve 10 is very widespread in that it is adaptable to convert a manual move-ment to a pressure varying directly therewith without the necessity of adding a significant amount of resistant force to the mechanism~
It h~s been found that in connection with modern engines for vehicles complex lin~ages and complex carburetion dev~ces are employed inducing forces resisting movement of -the throttle pedal of significant value, making it important that additional forces not be introduced in the linkage system.
In addition, it has been found that with modern vehicles the commonly used manifold vacuum pressure signal is no longer as reliable due to the type of controls placed on the engine today such that direct mechanical linkages are now desirable for operating the throttle valve within a hydraulic control system for a transmission~ With known direct operating throttle valves, a significant amount of force is required as the valve responds to movement of the throttle pedal and in particular at the heavy throttle or nearly full depressed throttle positions a rather large amount of force is required to move the throttle pedal.
The present invention overcomes the above difficulties in a throttle valve mechanism in that a pilot operating throttle valve is utilized wherein the forces added to the throttle linkage to enable the throttle valve to respond to movement thereof may be substantially zero since only a pilot valve member is connected to be moved by the throttle pedal. A
movable valve member is provided within the throttle valve ~hich has a control valve member`movable therein and the movable valve member follows movement thereof. A differential area is provided on the movable valve member responsive to --I ~
~` .
:~40~SZ
fluid pressure and a spring is provided opposing force developed by the differential area. The spring and differential area forces are imposed only on the movable valve member and are not imposed on the linkage mechanism connected to the throttle pedal. In addition, the invention carries out the construction in a very simple manner providing a hollow movable valve member having slidable therewithin a pilot valve control member connected to the throttle mechanism. The valve member is mounted in a bore having a pressure inlet, pressure outlet and regulating ports. The inlet port is connected to a source of fluid pressure, and the valve member has a plurality of ports communicating with the ports in the bore. The control member has means therein adapted to establish a connection between the inlet port and the outlet port through the ports in the valve member. The outlet port being , connected to the regulating port so that movement of the control member will be followed by the valve member to produce a pressure in the outlet port which varies with the position of a control member and therefore,,the position of the throttle mechanism.
The single FIGURE of the drawings is a schematic illustration of a valve embodying the principles of the present invention.
Referring to the drawing, the regulating valve 10 of the present invention is adapted to cooperate in a trans-mission control system with a source of fluid pressure 12, . ~ .
~q~4~ 5;~:
a primary regulator valve 14 and a hydraulic control system 16, In general, the ~unction of the valve 10 is to provide .
a signal to the transmission hyaraulic control system 16 which varies with movement of a control member of the engine, such as the throttle. By way of example, the invention is illustrated as a throttle valve for the control system. As manufactured and used the valve 10 would be within and a part of the hydraulic control system 16.
The source 12 supplies--pressure to primary regulator valve 14 which regulates such pressure and supplies such regulated pressure to a conduit 20, which is connected to the hydraulic control system 16 and to valve 10. The valve 10 develops a regulated pressure which varies directly ~ith the position of the throttle and supplies same to a conduit 22, which connects to the regulator valve 1~ to influence the primary regulator valve in accordance with known practice in the transmission hydraulic control system art, to control other unctions within the transmission such as the points at Which ratio changes take place in the transmission. The.
valve 10 is generally comprised of a bore 26 formed within a section 28 of a valve body for the hydraulic control system.
The bore 26 has slidable therewithin a movable valve member 30, The valve member 30 has a bore 32 therein which is adapted to receive a movable control member 34.
A very light spring 35 engages member 34 and urges same to the left as viewed in the drawing. Within the bore 26, a spring 36 is provided urging valve member 30 to the left, as v;`.ewed in the drawing, against a stop 38 connected to the valve section 28. Spring 36 is confined in bore 26 by a .
stop 39. A throttle cam 40 is provided, which is connected by linkage member 42 to be moved by a throttle pedal 44 for the vehicle. The li~kage illustrated is schematic only and is only a sample of types of linkages which may be used.
In general, as the throttle 44 is depressed, linkage 42 will move to the right and rotate cam 40 about the pivot 46.
The cam has a control surface'4~ thereon to engage the movable member 3~ and move same to the right as the throttle is depressed.
The valve member 30 has ports 50,52 and 54 therein.
~he movable control member 34 has an elongated groove 56 therein. The valve member 30 includes lands 60, 62, 64 and 66. A large land 68 is also provided on the right hand end thereof which slides within an enlarged diameter section 70 of the bore 28. The bore 28 includes ports 72, 74, 76 ~nd 78.
Port 72 is an exhaust port which will be connected to the sump for the transmission control system. Port 74 is an output port which is adapted to contain the product of the valve 10 and is connected to the output conduit 22.
Port 76 is the pressure inlet port connected to the conduit 20 having regulated fluid pressure therein. Port 78 is a regulating port, this port being connected -to the pressure within the conduit 22. Pressure in port 78 is communicated to the differential area between lands 66 and 68 and creates orce on movable member 30 tending to move same to the right, compressing the spring 36.
~4()(~S2 ~ s is known in the art, the operation of a regulating valve system is such that pressure in the output port 74 is communicated to a differential land area which develops a force in opposition to the force of a spring, such as spring 36, and thus a regulated pressure is provided in the conduit 22. In the present invention it will be seen that as the control member 34 moves to the right, assumlng the valve is at rest as illustrated in FIGURE 1, a communication will be opened up by the groove 56 communicating.the port 54 of valve member 30 with port 52, As this happens, pressure in port 52 will be communicated through port 74 and port 78 to act on khe differential land area between lands 66 and 68, and the valve member 30 will move to the.right a sufficient extent to interrupt the connection made by groove 56 and the relative positions of valve member 30 and member 34 are as illustrated in FIGURE 1 once again. However, each of the members 30 and 3~ have been moved to the right as the throttle is depressed, As members 30 and 34 assume an equilibrium position to the right of that illustra-ted in FIGURE i, the spring 36 becomes more compressed and creates additional force on valve member 30 and thus an increased regulated pressure is provided in conduit 22.
As will be apparent from the above description, as the throttle 44 is depressed rotating cam 40, and control member 34 is moved to the right against the force o the very light spring 35, it will be seen that due to the pilot operation, there are no forces on control member 34 e~cept for the very small force of the spring 35. Thus, a regulating valve has been provided which can be adapted to 1~4V1~52 respond to the throttle position as described above and wherein substantially no additional force is;required to be transmitted through the linkage between the throttle and the carburetor to operate the regulating valve 10.
As described above, this is important in that in more modern vehicles where it is desirable that a mechanical connection between the throttle and throttle valve be provided, due to the increasing complexity of carburetors and throttle linkages being used with engines, the forces resisting movement of pedal 44 are significant to an extent to make operation of pedal 44 uncomfortable to the operator of the vehicle. As described above, the present invention over-comes this problem by providing a pilot operation so that the movement o~ control member 3~ requires extremely small force.
. Although the valve 10 is described as used in conjunction with a throttle for a vehicle engine to produce a regulated throttle pressure varying with throttlè position for a hydraulic control system 16, it should be apparent that the unique regulating valve 10 can be used in connection with many other control functions wherein a pressure is desired which varies directly with the position of a movable member such as cam member ~0. Thus, the utility of the described improved pilot operated regulator valve 10 is very widespread in that it is adaptable to convert a manual move-ment to a pressure varying directly therewith without the necessity of adding a significant amount of resistant force to the mechanism~
Claims (5)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An improved regulator valve particularly adaptable for use in a transmission mechanism said valve including a valve member; a control member movable within the valve member and connected with the throttle mechanism of an engine; said valve member being mounted in a bore having a pressure inlet, pressure outlet and regulating ports;
characterized by the inlet port being connected to a source of fluid pressure; said valve member having a plurality of ports communicating with the ports in said bore; a spring urging said valve member in one direction; a differential land area comprising an external shoulder on said valve member being connected to said regulating port and adapted to urge said valve member in the other direction when fluid pressure is applied to said differential area, said control member having means therein adapted to establish a connection between said inlet port and said outlet port through the ports in said valve member; said outlet port being connected to said regulating port whereby movement of said control member will be followed by said valve member to produce a pressure in said outlet port which varies with the position of said control member and thus the position of the throttle mechanism, and whereby only minimal force is required to move said control member.
characterized by the inlet port being connected to a source of fluid pressure; said valve member having a plurality of ports communicating with the ports in said bore; a spring urging said valve member in one direction; a differential land area comprising an external shoulder on said valve member being connected to said regulating port and adapted to urge said valve member in the other direction when fluid pressure is applied to said differential area, said control member having means therein adapted to establish a connection between said inlet port and said outlet port through the ports in said valve member; said outlet port being connected to said regulating port whereby movement of said control member will be followed by said valve member to produce a pressure in said outlet port which varies with the position of said control member and thus the position of the throttle mechanism, and whereby only minimal force is required to move said control member.
2. An improved regulator valve as claimed in Claim 1 wherein an output conduit is connected to said outlet port whereby pressure in said output conduit will vary directly with the position of said control member.
3. A regulator valve as claimed in Claim 1 wherein the control member has a groove adapted to establish a connection between the inlet port and the outlet port through the ports in the valve member, said outlet port being connected to the regulating port, whereby movement of the control member by the throttle mechanism will be followed by said valve member to produce a pressure in said outlet port which varies with the position of the control member.
4. A regulator valve as claimed in Claim 3 wherein the throttle pressure conduit is connected between the outlet port and the hydraulic control mechanism.
5. A regulator valve as claimed in Claim 4 wherein the inlet port is located between the pressure outlet and the regulating ports.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US57467075A | 1975-05-05 | 1975-05-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1040052A true CA1040052A (en) | 1978-10-10 |
Family
ID=24297119
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA250,665A Expired CA1040052A (en) | 1975-05-05 | 1976-04-21 | Pilot operated regulator valve |
Country Status (8)
| Country | Link |
|---|---|
| JP (1) | JPS51134436A (en) |
| AU (1) | AU499402B2 (en) |
| BR (1) | BR7602770A (en) |
| CA (1) | CA1040052A (en) |
| DE (1) | DE2618683A1 (en) |
| FR (1) | FR2310507A1 (en) |
| GB (1) | GB1516902A (en) |
| SE (1) | SE427865B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5930940B2 (en) * | 1978-08-25 | 1984-07-30 | 日産自動車株式会社 | automatic transmission throttle valve |
| JPS5930941B2 (en) * | 1978-09-29 | 1984-07-30 | 日産自動車株式会社 | automatic transmission throttle valve |
| SE442434B (en) * | 1983-04-11 | 1985-12-23 | Mecman Ab | CONTROL VALVE FOR CONTROLLED PRESSURE SUPPLY TO AND PRESSURE BUILDING IN A PRESSURE SYSTEM |
| CN105972224B (en) * | 2016-05-18 | 2018-02-27 | 佛山市盈向精密机械科技有限公司 | A kind of Novel electric for die casting machine adjusts valve |
| CN108506559A (en) * | 2018-03-08 | 2018-09-07 | 上海锋机五金模具有限公司 | A kind of electric guide valve and its implementing process |
-
1976
- 1976-04-15 GB GB15743/76A patent/GB1516902A/en not_active Expired
- 1976-04-21 AU AU13181/76A patent/AU499402B2/en not_active Expired
- 1976-04-21 CA CA250,665A patent/CA1040052A/en not_active Expired
- 1976-04-26 JP JP51046671A patent/JPS51134436A/en active Pending
- 1976-04-28 DE DE19762618683 patent/DE2618683A1/en not_active Ceased
- 1976-05-03 SE SE7605051A patent/SE427865B/en unknown
- 1976-05-04 BR BR2770/76A patent/BR7602770A/en unknown
- 1976-05-05 FR FR7613439A patent/FR2310507A1/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| BR7602770A (en) | 1976-11-09 |
| GB1516902A (en) | 1978-07-05 |
| AU499402B2 (en) | 1979-04-12 |
| SE427865B (en) | 1983-05-09 |
| FR2310507A1 (en) | 1976-12-03 |
| JPS51134436A (en) | 1976-11-20 |
| DE2618683A1 (en) | 1976-11-18 |
| AU1318176A (en) | 1977-10-27 |
| SE7605051L (en) | 1976-11-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA1049375A (en) | Transmission ratio control system | |
| CA1132434A (en) | Servo-valve convertible construction | |
| JPS6357249B2 (en) | ||
| CA1040052A (en) | Pilot operated regulator valve | |
| EP0385058A3 (en) | Pilot operated variable force solenoid valve in an automatic transmission control circuit | |
| US4250923A (en) | Shift actuator for a multi-speed transmission | |
| JPS6412928A (en) | Constant-speed travel device for vehicle | |
| US2109615A (en) | Gear shifter | |
| CA1123693A (en) | Idle speed control actuator | |
| US2713800A (en) | Device for controlling internal combustion engine drive | |
| US2588140A (en) | Fluid control device | |
| US4587887A (en) | Shift valve for automatic transmission | |
| US3388765A (en) | Speed governing system | |
| US3868868A (en) | Transmission controlled emission control system | |
| JPS6412930A (en) | Constant-speed travel device for vehicle | |
| US4342299A (en) | Throttle positioning system | |
| JPH023071B2 (en) | ||
| US2887998A (en) | Engine governor | |
| US4485776A (en) | Cylinder-number-controlled engine | |
| US3225778A (en) | Hydraulic resistors | |
| GB1109357A (en) | Compound transmission | |
| US4669264A (en) | Apparatus and method for load control of an engine | |
| JPH0526057B2 (en) | ||
| US5259273A (en) | Transmission vaccum modulator assembly | |
| US3308677A (en) | Transmission control system |