NL2018732B1 - a hydraulic system for a vehicle, a vehicle transmission, and method for operating a vehicle transmission - Google Patents

a hydraulic system for a vehicle, a vehicle transmission, and method for operating a vehicle transmission Download PDF

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Publication number
NL2018732B1
NL2018732B1 NL2018732A NL2018732A NL2018732B1 NL 2018732 B1 NL2018732 B1 NL 2018732B1 NL 2018732 A NL2018732 A NL 2018732A NL 2018732 A NL2018732 A NL 2018732A NL 2018732 B1 NL2018732 B1 NL 2018732B1
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NL
Netherlands
Prior art keywords
hydraulic
pressure
hydraulic circuit
circuit
pump
Prior art date
Application number
NL2018732A
Other languages
Dutch (nl)
Inventor
Marie Van Druten Roell
Mark Smid Peter
Original Assignee
Punch Powertrain Nv
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=59746307&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=NL2018732(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Punch Powertrain Nv filed Critical Punch Powertrain Nv
Priority to NL2018732A priority Critical patent/NL2018732B1/en
Priority to NL2020576A priority patent/NL2020576B1/en
Priority to PCT/EP2018/059931 priority patent/WO2018192989A1/en
Priority to CN201880040422.8A priority patent/CN110785585B/en
Priority to US16/604,587 priority patent/US11585436B2/en
Priority to EP18720550.5A priority patent/EP3612754B1/en
Application granted granted Critical
Publication of NL2018732B1 publication Critical patent/NL2018732B1/en

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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
    • F16H61/0021—Generation or control of line pressure
    • 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
    • F16H61/0202—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 electric
    • F16H61/0204—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 electric for gearshift control, e.g. control functions for performing shifting or generation of shift signal
    • F16H61/0206—Layout of electro-hydraulic control circuits, e.g. arrangement of valves
    • 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
    • F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
    • F16H63/02—Final output mechanisms therefor; Actuating means for the final output mechanisms
    • F16H63/30—Constructional features of the final output mechanisms
    • F16H63/34—Locking or disabling mechanisms
    • F16H63/3416—Parking lock mechanisms or brakes in the transmission
    • F16H63/3483—Parking lock mechanisms or brakes in the transmission with hydraulic actuating means
    • 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
    • F16H61/0021—Generation or control of line pressure
    • F16H61/0025—Supply of control fluid; Pumps therefor
    • F16H2061/0034—Accumulators for fluid pressure supply; Control thereof
    • 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
    • F16H61/0021—Generation or control of line pressure
    • F16H2061/0037—Generation or control of line pressure characterised by controlled fluid supply to lubrication circuits of the gearing
    • 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
    • F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe ; Circumventing or fixing failures
    • F16H2061/1232—Bringing the control into a predefined state, e.g. giving priority to particular actuators or gear ratios
    • 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
    • F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe ; Circumventing or fixing failures
    • F16H2061/1244—Keeping the current state
    • 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
    • F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe ; Circumventing or fixing failures
    • F16H2061/1256—Detecting malfunction or potential malfunction, e.g. fail safe ; Circumventing or fixing failures characterised by the parts or units where malfunctioning was assumed or detected
    • F16H2061/1292—Detecting malfunction or potential malfunction, e.g. fail safe ; Circumventing or fixing failures characterised by the parts or units where malfunctioning was assumed or detected the failing part is the power supply, e.g. the electric power supply
    • 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
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • 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
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/0467—Elements of gearings to be lubricated, cooled or heated
    • F16H57/0473—Friction devices, e.g. clutches or brakes
    • 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
    • F16H61/0021—Generation or control of line pressure
    • F16H61/0025—Supply of control fluid; Pumps therefor
    • F16H61/0031—Supply of control fluid; Pumps therefor using auxiliary pumps, e.g. pump driven by a different power source than the engine
    • 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
    • F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
    • F16H63/02—Final output mechanisms therefor; Actuating means for the final output mechanisms
    • F16H63/30—Constructional features of the final output mechanisms
    • F16H63/34—Locking or disabling mechanisms
    • F16H63/3416—Parking lock mechanisms or brakes in the transmission
    • F16H63/3491—Emergency release or engagement of parking locks or brakes

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Transmission Device (AREA)
  • Gear-Shifting Mechanisms (AREA)

Abstract

A hydraulic system for a vehicle transmission with at least two friction elements, the system comprising a first hydraulic circuit comprising a pump for supplying hydraulic fluid to the first hydraulic circuit. A flow restriction may be provided in the first hydraulic circuit between an output of the pump and a sump for providing leakage of hydraulic fluid into the sump. Further, a second hydraulic circuit comprising a second pump may be arranged, wherein the hydraulic pressure in the first circuit is higher compared to the second circuit. A flow control element operated using hydraulic pressure from the first circuit may be arranged for controlling flow/pressure in the second circuit. Further, the hydraulic system may be arranged for generating a line pressure, wherein an actuator for engaging a park lock system may be connected to the first hydraulic circuit for enabling direct actuation by means of the line pressure.

Description

FIELD OF THE INVENTION
The invention relates to a vehicle transmission and a hydraulic system for a vehicle transmission. The vehicle transmission comprises at least two friction elements. The invention further relates to methods for controlling and/or operating a hydraulic system of a vehicle transmission. Further, the invention relates to a method for generating a line pressure in a vehicle transmission, a method for cooling and/or lubricating friction elements of a vehicle transmission, a method for actuating hydraulic actuators, and a method for operating a park lock system of a vehicle transmission.
BACKGROUND TO THE INVENTION
A transmission enables a controlled application of engine power by conversion of speed and torque from a power source, such as for example an electric engine, internal combustion engine, a hybrid engine, etc. A hydraulic system of a vehicle transmission may provide for actuation of friction elements in the transmission for coupling the transmission input to a geartrain so as to transmit, engine power to the wheels of the vehicle. For example a clutch module in an automatic transmission system can comprise two friction clutches for coupling the engine via the geartrain to the wheels by actuation of these clutches via said hydraulic system. In a variant one or more clutches can be made by using a powersplit mechanism with three rotational members where one member is connected to the input, one member is connected to the output and the third member can be connected to the transmission housing by means of actuation of a friction brake. Multiple configurations of these friction elements (clutch, brake) can be made resulting in various layouts of multi-friction transmissions. A transmission system of this type is know from e.g. US2013184119.
The brake and/or clutch elements can generate a considerable heat and the hydraulic system may also provide cooling fluid to each of the clutches and/or brakes of the transmission.
In a transmission system the friction element can be a wet clutch, which may be oil cooled. Typically, the electrohydraulic control of the transmission provides significant improved efficiency and performance, while maintaining the full shift comfort of traditional step automatics. A precise and fast control of the friction elements can be made possible by direct acting solenoids, which are electromechanically operated valves.
Fundamentally, a clutch of the transmission system can be of the wet clutch or the dry clutch design. A wet clutch design is preferably used for higher torque applications, whereas the dry clutch design is generally suited for smaller torque applications. Although the dry clutch variants of a transmission system may be limited in torque generation, compared to their wet clutch counterparts, the dry clutch variants may offer an improved fuel efficiency, mainly due to the cooling and lubrication. The wet clutch requires pumping transmission fluid in the clutch housing, which may results in losses. Therefore, additionally, the cooling system in a multiple friction transmission may play an important role for the overall efficiency of the transmission.
A layout of a transmission system with more than one friction element can be considered to be equivalent to having more than one transmissions in one housing which can be shifted and coupled independently, i.e. one power transmission assembly on each of the two input shafts together driving one output shaft, to enable uninterrupted gear shifting transmission in an automatic transmission form, while keeping high mechanical efficiency compared to a manual transmission.
Hence, an automated transmission with a plurality of friction elements using a wet clutch arrangements can be actuated and/or cooled/lubricated by means of a hydraulic system. Typically a higher pressure needs to be employed for actuation of friction elements than for lubrication/cooling of transmission elements. However, a higher flow is typically required for lubrication/cooling of transmission elements than for actuation of friction elements. Hence, from an efficiency point of view hydraulic separation of the two functions is advantageous for efficiency.
The system of US2004074732A1 comprises two electrically driven pumps. A hydraulic pump, actuated by an electric motor, provides lubrication via a first hydraulic line to transmission components at a possibly low pressure. A second hydraulic pump, actuated by a second electric motor, provides oil to a second hydraulic line feeding pressure control valves at a higher pressure compared to the first hydraulic line. The second hydraulic line comprises additionally a hydraulic fluid accumulator, allowing the second electric pump to operate in a duty cycle according to the state of charge of the fluid accumulator.
Such a system requires the pump to drive at a pressure considerably higher than the required actuation pressure when in a state of charging the hydraulic fluid accumulator, having a possibly negative effect on the needed power output of the electric motor. An additional pressure sensor is needed to monitor the state of charge of the accumulator. The high pressure in the second hydraulic line furthermore introduces an increased level of leakage in the system, compromising efficiency.
In the hydraulic system of WO2016058735A1, low pressure lubrication flow is provided by a first hydraulic pump, driven by a first electric motor. A second hydraulic pump with a second electric motor provides directly pressurized fluid to a clutch arrangement via a hydraulic line by means of electric motor speed control and a predictable leakage flow from the hydraulic line via a leakage point. A negative speed is required from the hydraulic pump to fully release the friction element in dynamic conditions by drawing fluid from the piston of the friction element. In such a configuration, each additional friction element requiring pressurized fluid for actuation will require an additional hydraulic pump and electric motor. The necessity of reversing the hydraulic pump rotation direction on the actuation channels require the leakage point to be submerged in fluid under all conditions to avoid the hydraulic pump drawing air when operating in a negative speed. The hydraulic fluid from the leakage point hence has to be directed in a fluid sump and cannot be used for active lubrication to a transmission element.
So, there is a need for a hydraulic system for a multiple friction transmission that addresses at least one of the above mentioned drawbacks while maintaining the advantages.
SUMMARY OF THE INVENTION
It is an object of the invention to provide for a method and a system that obviates at least one of the above mentioned drawbacks.
It is an object of the invention to provide a system and a method that improves the efficiency of the hydraulic system of the transmission.
It is a further object of the invention to provide a system and method resulting in generally lower pressures and less leakage.
It is a further object of the invention to provide for a method and a system for reducing drag losses of friction elements in a transmission.
Thereto, according to a first aspect, is provided a hydraulic system for a vehicle transmission. The transmission includes two or more friction elements. The hydraulic system comprises a first hydraulic circuit which is arranged for actuating the two or more friction elements (e.g. pressurized oil exerts a force on the friction elements via a piston), and a first electric driven pump which is arranged for supplying hydraulic fluid to the first hydraulic circuit. Further, the hydraulic system comprises a flow restriction provided in the first hydraulic circuit between an output of the first electric driven pump and a reservoir to provide leakage of hydraulic fluid into the reservoir. In this way, a pressure relief can be obtained by providing a leakage. The leakage can be constant. The flow restriction can provide for a pressure drop over a flow restriction for controlling and/or regulating the hydraulic pressure in the first hydraulic circuit. In this way, control of the hydraulic pressure in the first circuit can be simplified. Advantageously, in this way, the rotational speed of the electric driven pump can be used for controlling the hydraulic pressure in the first circuit. In an example, the leaked flow can be further used for lubricating and/or cooling transmission parts.
Optionally, the flow restriction has a fixed geometry. Optionally, the flow restriction is an orifice. In an example, a fixed orifice is employed. An orifice can be used for providing a constant leakage. The flow from the flow restriction can be directed through a pressure filter which may optionally have a overpressure bypass valve.
Optionally, the reservoir is a sump.
Optionally, the hydraulic system further includes a second hydraulic circuit arranged for lubricating and/or cooling the two or more friction elements, and a second electric pump arranged for supplying hydraulic fluid to the second hydraulic circuit. The first electric pump is arranged for delivering a higher pressure than the second electric pump. Further, the hydraulic system includes a flow control element arranged for controlling flow and/or pressure in the second hydraulic circuit. The flow control element is operated using hydraulic pressure from the first hydraulic circuit.
In this way, two electrically driven hydraulic pumps operating at an improved pressure range can be obtained. The regulated pressure can be chosen more optimally according to the demand from the friction element(s), since no hydraulic fluid accumulator or pressure relief valve is required in the pressure circuit. This may result in lower pressures and leakages. By leaving out an accumulator and means for sensing a hydraulic accumulator state of charge, a more cost-effective solution can be obtained.
Optionally, the flow control element comprises a proportional pressure valve. The proportional pressure valve can be configured to draw supply pressure from the first hydraulic circuit. The use of a proportional pressure valve being arranged for drawing fluid from the first hydraulic circuit instead of from the second hydraulic circuit reduced the requirement for high pressure in the second hydraulic circuit.
Hydraulic pressure from the first hydraulic circuit can be used for providing a pressure regulator with pressurized fluid by means of the proportional pressure valve, wherein the proportional pressure valve is arranged for controlling a directional valve of the flow control element. In an example, the directional valve is arranged for controlling flow in the second hydraulic circuit to one or more lubrication circuits. By drawing the pressurized hydraulic fluid for the pressure regulator obtained by means of the proportional pressure valve of the flow control element, from the first hydraulic circuit, the pressure in the second hydraulic circuit can be configured to operate at a lower value. This is beneficial for the efficiency of the hydraulic system, especially when the pressure of the second hydraulic circuit can be lowered and/or minimized.
Optionally, the directional valve of the flow control element is arranged for dividing the flow to one or more lubrication circuits. Further, by controlling the speed of the second hydraulic pump, the total supplied flow can be controlled, such that the magnitude of the flow provided to each friction element to be lubricated can be controlled. This concept making a cooling strategy possible to minimize drag losses on friction elements while assuring thermal protection of the friction elements by means of fully proportional, independent flow control.
The pressure obtained by means of the first electric pump may be substantially higher than the pressure obtained by the second electric pump. For example, the pressure obtained by means of the first electric pump may be 1.5-25 times higher than the pressure obtained by the second electric pump, preferably 310, more preferably 5-7. For example, actuation pressure may be in the range of 1020 bar, and lubrication pressure in the range of 2-3 bar.
Optionally, the second hydraulic circuit is, alternatively or additionally, arranged to lubricate and/or cool other transmission components.
According to a further aspect, is provided a hydraulic system for a vehicle transmission, the transmission including two or more friction elements and two or more hydraulic actuators, wherein the hydraulic system comprises: a first hydraulic circuit arranged for actuating the two or more hydraulic actuators; a second hydraulic circuit arranged for lubricating and/or cooling the two or more friction elements; a first electric driven pump arranged for supplying hydraulic fluid to the first hydraulic circuit; a second electric driven pump arranged for supplying hydraulic fluid to the second hydraulic circuit, wherein the first electric driven pump is arranged for delivering a higher pressure than the second electric driven pump; and a flow control element arranged for controlling flow and/or pressure in the second hydraulic circuit, wherein the flow control element is operated using hydraulic pressure from the first hydraulic circuit.
Optionally, the first hydraulic circuit is arranged for actuating friction elements, a park lock, synchronizers, and the like. In an example, the first hydraulic circuit may also be arranged for actuating pistons. Optionally, additionally or alternatively, the second hydraulic circuit is arranged for lubricating and/or cooling other transmission components.
Optionally, the first electric driven pump is arranged for delivering a substantially higher pressure than the second electric driven pump. In this way, a higher hydraulic pressure can be obtained in the first hydraulic circuit than in the second hydraulic circuit.
Optionally, the flow control element is arranged for controlling flow distribution. For this purpose, the flow control element may further comprise a directional valve. In an example, the flow control element comprises a proportional pressure valve and a directional valve, wherein the input of the proportional valve is connected with the first hydraulic circuit and the output of the proportional valve provides a pilot pressure to the directional valve.
Optionally, the first hydraulic circuit includes a flow restriction for determining a pressure in the first hydraulic circuit upstream of the flow restriction. The flow restriction can be provided between an output of the first electric driven pump and a reservoir to provide leakage of hydraulic fluid into the reservoir, such as a sump. In an example, a constant leakage is provided. By arranging a flow restriction in the first hydraulic circuit, a pressure drop is obtained for controlling the pressure in the first hydraulic circuit provided by the first electric driven pump. This may simplify the design of the hydraulic system of the transmission, while a good controllability of the pressure in the first hydraulic circuit can be obtained. The pressure in the first hydraulic circuit can be better controlled by controlling the speed of the first electric driven pump.
Optionally, hydraulic fluid flowing through the flow restriction can at least partly used for active lubrication of transmission components.
Optionally, the flow restriction has a fixed geometry. Advantageously, the rotational speed of the first electric driven pump can easily regulate pressure obtained in the first hydraulic circuit. The pressure in the first hydraulic circuit can form line pressure for the hydraulics of the transmission system. Thus the first hydraulic circuit can be arranged for generating the line pressure. Optionally, the first hydraulic circuit includes at least two control elements arranged for actuating the two or more friction elements, wherein the control elements are operated using hydraulic pressure from the first hydraulic circuit. Optionally, such control element comprises a proportional valve and/or a solenoid valve. Further, the line pressure can be controlled and/or regulated by means of the pump. The pressure provided to the one or more actuators can be controlled or regulated by means of the control elements, e.g. proportional pressure valves.
Optionally, the hydraulic system further includes a controller arranged for controlling hydraulic pressure in the first hydraulic circuit by controlling flow of hydraulic fluid through the flow restriction.
Optionally, the controller is arranged for controlling a speed of the first electric driven pump.
Optionally, the first hydraulic circuit is free from a hydraulic fluid accumulator. In this way, the hydraulic system can be simplified. Also the efficiency and/or reliability of the hydraulic system can be improved in this way.
Optionally, the first hydraulic circuit is free from a pressure relief valve arranged for setting the hydraulic pressure in the first hydraulic circuit. Instead, the flow restriction, e.g. having the fixed geometry, in the first hydraulic circuit is used for setting the hydraulic pressure in conjunction with the first pump.
Optionally, the controller is arranged for rotating the first electric driven pump in one direction only.
Optionally, the flow control element and/or the at least two control elements include(s) an electric control input. Said elements may include solenoid valves. Other electric hydraulic valves are also possible.
Optionally, one of the two or more hydraulic actuators is arranged for actuating a park lock system. The hydraulic actuator can be hydraulically connected to the first hydraulic circuit for direct actuation of the hydraulic actuator using the line pressure.
According to a further aspect, is provided a hydraulic system for a vehicle transmission, comprising: a first hydraulic circuit arranged for generating a line pressure; and a hydraulic actuator arranged for engaging a park lock system, wherein the hydraulic actuator is hydraulically connected to the first hydraulic circuit for direct actuation of the hydraulic actuator using the line pressure. The vehicle transmission can include two or more friction elements.
Optionally, the hydraulic actuator is arranged for bringing or maintaining the park lock system in a park position when the line pressure is below a predetermined pressure threshold. Alternatively or additionally, the hydraulic actuator is configured for bringing or maintaining the park lock system in a park position in case of no availability of electricity. Such embodiments may be particularly advantageous in view of safety norms.
Optionally, a locking element is connected to the hydraulic actuator configured for at least one of the two purposes:
in order to keep a park lock unarmed when the line pressure accidentally drops (e.g. by a TCU reset) below a predetermined threshold and to keep the park lock unarmed for the purpose of safety.
in order to keep the park lock armed when the line pressure accidentally increases above a predetermined threshold and to keep the park lock armed for the purpose of safety.
Optionally, the locking element is an electro-mechanical actuator (e.g. electrical solenoid). Optionally, the locking element is normally open, so in case there is no electricity available, the locking element will not lock the hydraulic actuator and the park lock will still get in an armed position in such case.
Optionally, there is an electronic control element for actuating the locking element. Optionally, this electronic control element (e.g. relay) is normally closed, so when there is an interruption of electricity for this control element due to a TCU (Transmission Control Unit) reset the control element still provides electricity to the locking element and it will keep locking the hydraulic actuator. When there is no availability of electricity (power failure) then there is no electricity to go through the control element and also no electricity for the locking element and the park-lock will be automatically armed.
Optionally there is an arming spring which exerts a force on the hydraulic actuator . Without hydraulic pressure the arming spring will move the intermediate body to move a cone which engages a park pawl. In case the park pawl cannot be engaged (tooth-to-tooth with the park gear), the engage spring is preloaded which is pushing to the cone. As soon as the vehicle starts rolling the park can be engaged by the cone engaging the park pawl. The arming spring is stronger than the engage spring.
The park is released by applying pressure to the piston, moving the intermediate body in the opposite direction, moving the cone away from the park pawl, where the park pawl is released from the park gear by a third spring.
The state of the intermediate body can be locked by the locking element assuring a state of release (non-park) or armed (park) independent of the current state of hydraulic pressure.
Optionally, the first hydraulic circuit includes a valve arranged for draining the hydraulic actuator when the line pressure is below a predetermined pressure threshold. Optionally, the valve is provided between the hydraulic actuator and the first pump. Optionally, the valve is arranged to drain the hydraulic actuator to a reservoir, such as a sump, when the line pressure is below the predetermined pressure threshold. Optionally, this is additionally or alternatively performed in case of no availability of electricity. A check valve may be arranged for allowing the pilot pressure to drop on actuating side of valve.
Optionally, the hydraulic actuator is arranged for bringing or maintaining the park lock system in a non-park position when the line pressure is below a predetermined pressure threshold and/or in case of no availability of electricity.
Optionally, the hydraulic actuator includes an actuator arranged for maintaining the park lock system in a park position or non-park position according to a last input of an operator of the hydraulic system when the line pressure is below a predetermined pressure threshold and/or in case of no availability of electricity. Optionally, the actuator is an (electro)mechanical actuator.
Optionally, the hydraulic system includes a non-return valve between the first hydraulic pump and the hydraulic actuator of the park lock system. Advantageously, this enables that the system can be set in park mode faster.
According to a further aspect is provided a vehicle transmission including the hydraulic system.
Optionally, the vehicle transmission includes mechanical means for bringing the park lock system from a park position to a non-park position when the line pressure is below a predetermined pressure threshold. Additionally or alternatively, the mechanical means can be used to bring the park lock system from a park position to a non-park position in case no electricity is available. This allows to revert the vehicle transmission to a non-park position, e.g. in case of an emergency.
According to a further aspect, is provided a method for generating a line pressure in a vehicle transmission. The vehicle transmission includes a first hydraulic circuit arranged for actuating two or more friction elements. The method includes supplying hydraulic fluid to the first hydraulic circuit using a first pump;
and using a flow restriction provided in the first hydraulic circuit between an output of the first pump and a reservoir, such as a sump, to provide leakage of hydraulic fluid into the reservoir for generating the line pressure.
Optionally, the pump is an electrically driven pump. Optionally, the flow restriction is a fixed geometry flow restriction.
Optionally, the method further includes controlling the line pressure by controlling a flow speed of the first pump.
Optionally, the method further includes controlling two or more actuators associated with the two or more friction elements using at least two control elements which are operated using the line pressure. A control element may be a proportional valve and/or a solenoid valve.
Optionally, the method further includes cooling and/or lubricating the friction elements, using a second hydraulic circuit having a second pump associated therewith, by controlling flow and/or pressure in the second hydraulic circuit using a flow control element, wherein the flow control element is operated using the line pressure. The second pump may be an electric driven pump. Optionally the flow distribution and/or pressure in the second hydraulic circuit is controlled.
According to a further aspect, is provided a method for coofing and/or lubricating friction elements of a vehicle transmission, the vehicle transmission including a first hydraulic circuit arranged for actuating two or more hydraulic actuators associated with two or more friction elements, a second hydraulic circuit arranged for lubricating and/or cooling the two or more friction elements and/or other transmission components, a first electric pump arranged for supplying hydraulic fluid to the first hydraulic circuit, and a second electric driven pump arranged for supplying hydraulic fluid to the second hydraulic circuit, wherein the first electric pump is arranged for delivering a higher pressure than the second electric pump, the method including cooling and/or lubricating the friction elements by controlling flow (and/or flow distribution) and/or pressure in the second hydraulic circuit using a flow control element, wherein the flow control element is operated using hydraulic pressure from the first hydraulic circuit.
Optionally, the first electric pump is arranged for delivering a substantially higher pressure than the second electric pump.
According to a further aspect, is provided a method for actuating hydraulic actuators associated with two or more friction elements of a vehicle transmission using a first hydraulic circuit, the method including supplying hydraulic fluid to the first hydraulic circuit using a first electric driven pump; and controlling pressure of the first hydraulic circuit by providing a flow restriction in the first hydraulic circuit between the first electric pump and a reservoir to provide leakage of hydraulic fluid into the reservoir and controlling a speed of the first electric driven pump.
Optionally, the method further includes releasing a park lock system using a hydraulic actuator hydraulically connected to the first hydraulic circuit, and directly actuating the hydraulic actuator using the line pressure.
The invention further relates to a method for operating a park lock system of a vehicle transmission, including: generating, using a first hydraulic circuit, a line pressure; and releasing a park lock system using a hydraulic actuator hydraulically connected to the first hydraulic circuit, and directly actuating the hydraulic actuator using the line pressure.
It will be appreciated that any one or more of the above aspects, features and options described in view of the methods apply equally to the vehicle and the transmission system. It will also be clear that any one or more of the above aspects, features and options can be combined.
BRIEF DESCRIPTION OF THE DRAWING
The invention will further be elucidated on the basis of exemplary embodiments which are represented in a drawing. The exemplary embodiments are given by way of non-limitative illustration. It is noted that the figures are only schematic representations of embodiments of the invention that are given by way of non-limiting example.
In the drawing:
Fig. 1 shows a schematic diagram of an embodiment of a hydraulic transmission system;
Fig. 2 shows a schematic diagram of an embodiment of a hydraulic transmission system;
Fig. 3 shows a schematic diagram of an embodiment of a hydraulic transmission system;
Fig. 4 shows a schematic diagram of an embodiment of a hydraulic transmission system;
Fig. 5 shows a schematic diagram of an embodiment of a hydraulic transmission system;
Fig. 6 shows a schematic diagram of an embodiment of a hydraulic transmission system;
Fig. 7 shows a schematic diagram of an embodiment of a hydraulic transmission system;
Fig. 8 shows a schematic diagram of an embodiment of a park lock system;
Fig. 9 shows a schematic diagram of an embodiment of a park lock system;
Fig. 10 shows a schematic diagram of an embodiment of a hydraulic transmission system;
Fig. 11 shows a block diagram for a method for generating a line pressure in a vehicle transmission;
Fig. 12 shows a block diagram for cooling and/or lubricating friction elements of a vehicle transmission;
Fig. 13 shows a block diagram for actuating hydraulic actuators; and
Fig. 14 shows a block diagram for operating a park lock system of a vehicle transmission.
DETAILED DESCRIPTION
Fig. 1 shows a schematic diagram of an embodiment of a hydraulic transmission system 1 according to the present invention. The hydraulic transmission system 1 is arranged for use with a vehicle transmission including two or more friction elements, such as for example a clutch element and a brake element. The system 1 comprises a first hydraulic circuit 2 which is arranged for actuating the two or more friction elements of the transmission. The system 1 further comprises a first electric driven pump 4 arranged for supplying hydraulic fluid to the first hydraulic circuit 2. The system 1 also comprises a flow restriction provided in the first hydraulic circuit 2 between an output of the first electric driven pump 4 and a reservoir 8, here a sump, to provide leakage of hydraulic fluid into the reservoir 8.
The first electric driven pump 4 may be a pressure pump which is arranged to supply pressurized hydraulic fluid to first hydraulic circuit 2 via a pressure pump outlet line. In the embodiment of fig. 1, two hydraulic lines for actuation of clutch elements, i.e. a first clutch actuation line 10a and a second clutch actuation line 10b, are each connected with the first hydraulic circuit 2 with control elements 12a, 12b arranged therebetween. In this example the control elements 12a, 12b are solenoid valves 12a, 12b. Advantageously, direct acting solenoid valves 12a, 12b are arranged in the hydraulic system 1. In this example each of the one or more hydraulic actuation lines 10a, 10b of the hydraulic system 1 is connected to a respective friction element, such as a clutch. The friction elements of the transmission may be arranged in a clutch pack or in any other arrangement within the transmission 16, connected to the hydraulic system 1 by means of the first clutch actuation line 10a and the second clutch actuation line 10b.Other arrangements with other friction elements are also possible. For example, more friction elements may be employed. Also, instead of a clutch, a brake may also be used as a friction element of the transmission. The pressure pump 4 can be driven by an electric motor 4a. The electric motor 4a may also be integrated with the pump, such that the electric driven pump 4 comprises the electric motor 4a. Such unitary arrangement allows a more compact and robust means for providing pressurized hydraulic fluid to the first hydraulic circuit 2. Furthermore, an inlet of the pump 4 is connected to the reservoir 8. A filter 14 may be arranged in the hydraulic system 1 for filtering the fluid entering the pump 4. In some cases such a filter is not necessary.
In an exemplary embodiment, the flow restriction 6 is formed by an orifice 6. Such an orifice 6 may provide a constant leakage. For example, a fixed orifice 6 may be employed. The flow from the flow restriction 6 can optionally be directed through a pressure filter 16 which may optionally have a overpressure bypass valve 18.
In the embodiment of fig. 1, the direct acting solenoid valves 12a, 12b (control elements) arranged respectively in the wet friction element actuation lines
10a, 10b are normally closed directional control valves. The control valves 12a, 12b in this example are proportional valves. The valves 12a, 12b may have a finite number or infinite number of positions from closed to open. The solenoid valves can be electromechanically operated by an electrical current. The control elements 12a, 12b, or the direct acting solenoid valves 12a, 12b, are spring biased to the first position, wherein the valve is closed. Said direct acting solenoid valves 12a, 12b can be switched to the second position, or open position, when the solenoid is energized. Other types of control elements, e.g. valves, can also be employed for connecting the first hydraulic circuit 2 with the first and second friction element actuation lines 10a and 10b.
Fig. 2 shows a schematic diagram of an embodiment of a hydraulic system 1 of a transmission system, the hydraulic system further including a second hydraulic circuit 20 arranged for lubricating and/or cooling the two or more friction elements of the transmission system 1, and/or other transmission components (not shown). A second electric pump 22 is arranged for supplying hydraulic fluid to the second hydraulic circuit 20. Here, the first electric pump 4 is arranged to deliver a (substantially) higher pressure than the second electric pump 22. Further, a flow control element 24 is arranged for controlling flow and/or pressure in the second hydraulic circuit 20. The flow control element 24 comprises a pressure regulator 26 and a directional valve 28, wherein the pressure regulator 26 is arranged to provide a pilot pressure for operating the directional valve 28. In this exemplary embodiment, the directional valve 28 has three ports and three positions. In a first position, lubricating and/or cooling is only provided to the first friction element (e.g. first clutch element) of the transmission via a first cooling/lubricating line 30a. In a second position, lubricating and/or cooling is provided to the first and second friction element (e.g. first and second clutch element) of the transmission via a first cooling/lubricating line 30a and a second cooling/lubricating line 30b. In a third position lubricating and/or cooling is provided only to the second friction element (e.g. second clutch element) of the transmission via the second cooling/lubricating line 30b. More positions are possible. In this example the directional valve 28 is a proportional valve, such that distribution of the flow of hydraulic fluid into the first and second cooling/lubricating lines 30a, 30b can be regulated in a finite number of steps/positions (discretely) or infinite number of steps/positions (continuously). In this way more flow can be guided to one of the two cooling/lubricating lines, for example a flow distribution of 10/90, 20/80, 30/70, 40/60, 50/50, 60/40, etc. to the first/second cooling lubricating line 30a/30b, in a discrete or continuous distribution. Hence, the directional valve 28 may be arranged to have infinite positions so as to provide a fully variable distribution of hydraulic fluid. Other cooling/lubricating lines may also be arranged for cooling/lubricating other friction elements and/or components of the transmission. The output of the second electric pump 22 is connected to the input of the directional valve 28. The output of the pump 22 also branches off to the pressure regulator 26 which provides a pilot pressure to the directional valve 28 by means of a pilot pressure line for operating the directional valve 28 (which is spring biased). The pressure regulator 26 is a solenoid valve and can be electromechanically operated by means of an electrical current. The pressure regulator 26 can be a direct acting solenoid valve which is spring biased to a first position, wherein the valve is closed. This direct acting solenoid valve 26 can be switched to the second position, or open position, when the solenoid is energized by means of an electrical current. Other types of valves may also be arranged in the hydraulic system 1 for operating the directional valve 28. In this embodiment, the flow control element 24 comprises a plurality of valves. However, it is also envisaged that the flow control element 24 is formed by other components, such as only one valve, or a plurality of valves cooperating such as to control the flow of hydraulic fluid in the second hydraulic circuit for lubricating and/or cooling the two or more friction elements and/or other transmission components of the transmission system 1. Additionally, a filter 32 maybe arranged for filtering the hydraulic fluid supplied to the inlet of the second electric pump 22. A filter 32 and filter 14 may be combined to one filter in an arrangement having optionally two outlets. The pump 22 is actuated by means of an electric motor 22a. As described earlier, the electric motor 22a of the second electrically driven pump 22 may also be integrated to form a unitary unit.
Fig. 3 shows a schematic diagram of an embodiment of a hydraulic system 1 for a vehicle transmission system. In the shown embodiment, the vehicle transmission comprises two friction elements each having a hydraulic actuator.
The hydraulic system 1 comprises a first hydraulic circuit 2 which is arranged for actuating the two hydraulic actuators of the transmission, such as e.g. a friction element, a park lock, a synchronizer, etc. Further, the hydraulic system 1 comprises a second hydraulic circuit which is arranged for lubricating and/or cooling the two friction elements and/or other transmission components. Additionally, the hydraulic system 1 comprises a first electric driven pump 4 arranged for supplying hydraulic fluid to the first hydraulic circuit 2, and a second electric driven pump 22 arranged for supplying hydraulic fluid to the second hydraulic circuit 20, wherein the first electric driven pump 4 is arranged for delivering a (substantially) higher pressure than the second electric driven pump 22. The hydraulic system 1 further comprises a flow control element 24 being arranged for controlling flow and/or pressure in the second hydraulic circuit 20. The control element is operated using hydraulic pressure from the first hydraulic circuit 2.
In the exemplary embodiment of fig. 3, the flow control element 24 comprises a pressure regulator 26 formed by a proportional valve 26, and a directional valve 28. Hence, the flow control element 24 comprises two components in this embodiment, namely a proportional valve 26 and a directional valve 28. The first hydraulic circuit 2 is connected to an input of the proportional valve 26. The output of the proportional valve 26 is connected to a pilot pressure line for providing a pilot pressure the directional valve 28. The use of proportional pressure valves drawing fluid from a hydraulic line, instead of actuating directly via a hydraulic pump by means of an electric motor, may result in a better dynamic pressure control on the friction elements of the transmission. Therefore, it is advantageous to use pressure from the first hydraulic circuit to provide a pressure regulator 26 with pressurized fluid. This pressure regulator 26 controls the directional valve 28, controlling flow in the second hydraulic circuit 20 to one or more lubrication circuits of the hydraulic system 1. In this exemplary embodiment, the hydraulic system 1 comprises a first cooling/lubricating line 30a and a second cooling/lubricating line 30b. Advantageously, by drawing the pressurized fluid for the pressure regulator 26 from the first hydraulic circuit, the pressure in the second hydraulic circuit 20 can be designed to a minimum value for efficiency. By having a directional valve 28 dividing the flow to one or more lubrication/cooling circuits 30a, 30b, and a speed controlled hydraulic pump controlling the supply flow of hydraulic fluid, the magnitude of the flow of hydraulic fluid to each friction element of the transmission can be controlled or regulated. Flow through both lubrication/cooling circuits 30a, 30b can be stopped by halting the pump 22. This concept allows a cooling strategy for the transmission for minimizing drag losses on friction elements of the transmission while thermal protection of the friction elements may be assured by means of fully proportional independent flow control in the hydraulic system 1.
Fig. 4 shows a schematic diagram of an embodiment of a hydraulic system 1 for a vehicle transmission system. The hydraulic system 1 comprises additional features with respect to the embodiment of fig. 3. In particular, the first hydraulic circuit 2 further includes a flow restriction 6 for determining a pressure in the first hydraulic circuit 2 upstream of the flow restriction, provided between an output of the first electric driven pump 4 and the reservoir 8 to provide leakage of hydraulic fluid into the reservoir. Preferably, the reservoir 8 is a sump.
Further, optionally, a sensor 34 may be arranged in the first and second friction element actuation lines 10a and 10b for measuring the pressure in said lines 10a, 10b. Advantageously, the pressure characteristics in the first pressure circuit 2 can be assessed by opening either one of the direct acting solenoid valves 12a, 12b, which are arranged in the clutch actuation line 10a, 10b, and measure the pressure with the pressure sensor 34 on each of said lines 10a, 10b. Also, optionally, a damper 36 may be arranged in the clutch actuation lines 10a, 10b so as to increase the pressure stability in said hydraulic lines 10a, 10b. For instance, adverse pressure peaks and/or pressure fluctuations can at least partially be smoothed out by the dampers 36 in the actuation lines 10a, 10b.
In an advantageous embodiment, the flow restriction 6 has a fixed geometry. In this way, the speed of the first electric driven pump 4 can control or regulate the pressure in the first, hydraulic circuit 2. The speed or rotational speed of the pump 4 may be an advantageous control parameter for the pressure of the first hydraulic pressure circuit. In this way, the controllability of the pressure of the hydraulic system 1 can be improved.
In an exemplary embodiment, a controller (not shown) is arranged for controlling the hydraulic pressure in the first hydraulic circuit 2 by controlling flow of the hydraulic fluid through the flow restriction 6. Optionally, the controller can be arranged for controlling a speed of the first electric driven pump 4.
Advantageously, the hydraulic system 1 can be arranged to be free from a hydraulic fluid accumulator. Additionally or alternatively, the first hydraulic circuit 2 is free from a pressure relief valve arranged for setting the hydraulic pressure in the first hydraulic circuit 2. Further, additionally or alternatively, the controller can be arranged for rotating the first electric driven pump 4 in one direction only.
In the shown embodiment of fig. 4, the flow control element 24 and/or the at least two control elements 12a, 12b include an electric control input.
Fig. 5 shows a schematic diagram of an embodiment of a hydraulic transmission system 1. The first hydraulic circuit 2 further incfudes a relief valve 38 for controlling the pressure in the first hydraulic circuit 2. The pressure relief valve 38 connects the first hydraulic circuit 2 with the injection inlet of the first electric driven pump 4 of the first hydraulic circuit 2. The pressure relief valve 38 comprises a pressure biasing element, such as a spring, which is configured so that, the pressure of fluid communicated to the inlet, of the valve can be limited, taking into account the pressure at the inlet. Further, the pressure relief valve 38 comprises a sensing port which communicates with the hydraulic line connected to the inlet of the valve, which hydraulic line is in fluid communication with the reservoir 8 with a filter 14 therebetween. In some cases the filter 14 may be omitted.
Fig. 6 shows a schematic diagram of an embodiment of a hydraulic system 1 for a vehicle transmission system. The flow control element 24 comprises a pressure regulator 26 and a directional valve 28, wherein the pressure regulator is arranged to provide a pilot pressure to the directional valve 28 by means of a pilot pressure line. By means of the pilot pressure, the directional valve 28 can be operated. The flow control element 24 is arranged for controlling flow (distribution) and/or pressure in the second hydraulic circuit 20. The control element 24 is operated using hydraulic pressure from the first hydraulic circuit 2, wherein the pressure regulator is connected to the first, hydraulic circuit 2. In this embodiment, the directional valve 28 has three ports and four positions (instead of e.g. three positions in the exemplary embodiment of fig. 4). It is also possible to have infinite positions as described in view of fig. 4. In a first position, lubricating and/or cooling is blocked and is therefore not provided to any one of the friction elements (i.e. first and second friction element). In a second position, lubricating and/or cooling is only provided to the first friction element (e.g. first clutch element) of the transmission via a first cooling/lubricating line 30a. In a third position, lubricating and/or cooling is provided to the first and second friction element (e.g. first and second clutch element) of the transmission via a first cooling/lubricating line 30a and a second cooling/lubricating line 30b. In a fourth position lubricating and/or cooling is provided only to the second friction element (e.g. second clutch element) of the transmission via the second cooling/lubricating line 30b. In this embodiment, the cooling/lubricating lines 30a, 30b are used for cooling. Additional lubricating lines 30c, 30d are arranged in the second hydraulic circuit 20 for providing lubrication to the friction elements of the vehicle transmission.
Fig. 7 shows a schematic diagram of an embodiment of a hydraulic system 1 for a vehicle transmission system. The hydraulic system 1 is arranged for use with a vehicle transmission including two or more friction elements (not shown). The system 1 comprises a first hydraulic circuit 2 which is arranged for actuating the two or more friction elements of the transmission. The system 1 further comprises a first electric driven pump 4 arranged for supplying hydraulic fluid to the first hydraulic circuit 2. The electric driven pump 4 may comprise an electric motor 4a. Advantageously, the pump 4 and motor 4a may form an integrated unit. The hydraulic system 1 is arranged for generating a line pressure. Furthermore, the hydraulic system 1 comprises a hydraulic actuator 40 which is arranged for engaging a park lock system 50. The park lock system 50 comprises a park lock. The hydraulic actuator 40 is hydraulically connected to the first hydraulic circuit 2 for direct actuation of the hydraulic actuator 40 using the line pressure.
Advantageously, the hydraulic actuator can be arranged for bringing or maintaining the park lock system in a park position when the line pressure is below a predetermined pressure threshold and/or in case of no availability of electricity. For this purpose, according to the shown embodiment of fig. 7, the first hydraulic circuit 2 includes a valve 42 which is provided between the hydraulic actuator 40 and the first electric driven pump 4. The valve 42 is arranged for draining the hydraulic actuator 40 to a sump or reservoir when the line pressure is below a predetermined pressure threshold and/or in case of no availability of electricity. A check valve may be arranged for allowing pilot pressure to drop on an actuating side of the valve. In an advantageous embodiment, the hydraulic actuator 40 is arranged for bringing or maintaining the park lock system in a nonpark position when the line pressure is below a predetermined pressure threshold and/or in case of no availability of electricity. The hydraulic actuator may include an ((electro)mechanical) actuator 41 which is arranged for maintaining the park lock system in a park position or non-park position according to a last input of an operator of the hydraulic system 1 when the line pressure is below a predetermined pressure threshold and/or in case of no availability of electricity. Additionally, the hydraulic system 1 may include a non-return valve between the first hydraulic pump 4 and the hydraulic actuator 40. In this way, it may be possible to bring the park lock system faster in a park position.
Fig. 8 shows a schematic diagram of an embodiment of a park lock system 50. Here the park lock system is arranged to be in non-park position when pressurized (unarmed). A locking element 41 is connected to the hydraulic actuator 40. The locking element 41 is arranged for keeping the park lock system 50 unarmed in case of a pressure drop (e.g. an unexpected or accidental pressure drop). This may be the case when the line pressure drops below a predetermined threshold. Such a pressure drop may be caused by a TCU (Transmission Control Unit) reset. However, other circumstances may also lead to such a pressure drop. Advantageously, in this way, the park lock system 50 can stay unarmed for the purpose of safety.
Additionally or alternatively, the locking element 41 may be arranged for keeping the park lock system 50 armed when the line pressure accidentally increases above a predetermined threshold so that the park lock system 50 may remain armed for safety purposes.
The locking element 41 is formed by an electro-mechanical actuator comprising an electrical solenoid 52. Preferably, the locking element 41 is normally open, so when there is no availability of line pressure and electricity the locking element will not lock the hydraulic actuator 40 and the park lock system 50 will still get in the armed position in such case. An (electronic) control element 54 is arranged for actuating the locking element 41. The electronic control element 54 may comprise a relay. Other types of control elements 54 may also be employed for this purpose. Preferably, the electronic control element 54 is normally closed, so that when there is an interruption of electricity for this electronic control element 54, for example due to a TCU reset, the electronic control element still provides electricity to the locking element 41 and it may keep locking the hydraulic actuator. Similar alternatives may also be employed for obtaining this result. When there is no availability of electricity (e.g. as a result of a power failure), there is no electricity to go through the (electronic) control element 54 and also no electricity for the locking element 41 and the park-lock system 50 can be automatically armed.
In fig. 8b the park lock system includes (electro)mechanical means 53 for bringing the park lock system 50 from a park position to a non-park position when the line pressure is below a predetermined pressure threshold, e.g. in case of line pressure loss. Additionally or alternatively, the mechanical means 53 can be used to bring the park lock system 50 from a park position to a non-park position in case no electricity is available. This allows to revert the vehicle transmission to a non-park position, e.g. in case of an emergency. In fig. 8c the mechanical means 53 is actuated to revert the park lock system 50 from the park position (fig. 8b) to the non-park position (fig. 8c).
Fig. 9 shows a schematic diagram of an embodiment of a park lock system 50. In the shown embodiment, the park lock system 50 is normally closed (armed) by a spring. The park lock system 50 can be released by hydraulic pressure. Further, the park lock system 50 comprises means for releasing the park lock system 50 in case of failure. A locking mechanism may be arranged for securing a current state of the park lock system 50. An arming spring 56 is arranged which exerts a force on the hydraulic actuator 40 comprising a piston 58. In the absence of hydraulic pressure, the arming spring 56 will move the intermediate body to move a cone 60 which engages the park pawl 61. In case the park pawl 61 cannot be engaged (tooth-to-tooth with the park gear), an engage spring 62 is preloaded which is pushing to the cone 60. As soon as the vehicle (not shown) starts rolling the park can be engaged by the cone 60 engaging the park pawl 61. The arming spring 56 is stronger than the engage spring 62. The park lock system 50 is released by applying pressure to the piston 58, moving the intermediate body in the opposite direction, moving the cone 60 away from the park pawl 61, where the park pawl 61 is released from the park gear by a third spring (not shown).The state of the intermediate body can be locked by the locking element 41 assuring a state of release (non-park) or armed (park) independent of the current state of hydraulic pressure.
Advantageously, the park lock can be armed in case of electric power failure and the park can be overruled (engage/disengage, lock/release) by means of a dedicated arrangement.
Fig. 10 shows a schematic diagram of an embodiment of a hydraulic system 1 for a vehicle transmission system. The embodiment of fig. 10 comprises features relating to at least the embodiments of figs. 4 and 7. This exemplary embodiment comprises three hydraulic lines for actuation 10a, 10b, 10c of hydraulic actuators, such as hydraulic actuators of friction elements, or an hydraulic actuator of a park lock system. Further, the hydraulic system 1 comprises two cooling/lubricating lines 30a, 30b. The second cooling/lubricating line 30b relates to the friction elements of the transmission. Additionally, optionally a cooler 44 is arranged in the second hydraulic circuit 20 for cooling the wet friction elements via the cooling/lubricating lines 30a, 30b. The pressure regulator 26 provides a pilot pressure to the directional valve 28 by means of a pilot pressure line 46. The pressure regulator 26 may be operated electrically (e.g. solenoid valve). Hydraulic fluid under pressure is supplied to the pressure regulator 26 coming from the first hydraulic circuit 2. Therefore the first (electric) pump 4 feeds the pressure regulator 26 with hydraulic fluid. The directional valve 28 is arranged to direct the flow between the two cooling/lubricating lines 30a, 30b. In this way the flow of hydraulic fluid obtained by means of the second (electric) pump 22 in the second hydraulic circuit 20 can be distributed, for example depending on the cooling/lubrication nee ds.
Fig. 11 shows a block diagram of a method 1000 for generating a line pressure in a vehicle transmission including a first hydraulic circuit arranged for actuating two or more friction elements. In a first step 1001, hydraulic fluid is supplied to the first hydraulic circuit 2 using a first pump 4. Preferably, the first pump 4 is an electric driven pump. In a second step 1002, a flow restriction 6 provided in the first hydraulic circuit 2 between an output of the first pump 4 and a reservoir 8 is used for providing leakage of hydraulic fluid into the reservoir 8 for generating a line pressure. Advantageously, the line pressure is controlled by controlling a flow speed of the first pump 4. Preferably the reservoir is a sump. Furthermore, the flow restriction 6 may be a fixed geometry flow restriction. This may allow improved control of the pressure in the first hydraulic circuit 2 provided by the first (electric driven) pump 4.
Fig. 12 shows a block diagram of a method 2000 for cooling and/or lubricating friction elements of a vehicle transmission. The vehicle transmission includes a first hydraulic circuit 2 arranged for actuating two or more hydraulic actuators associated with two or more friction elements, a second hydraulic circuit 20 is arranged for lubricating and/or cooling the two or more friction elements and/or other transmission components, a first (electric) pump 4 is arranged for supplying hydraulic fluid to the first hydraulic circuit 2, and a second (electric) pump 22 is arranged for supplying hydraulic fluid to the second hydraulic circuit 20. The first electric pump 4 is arranged for delivering a (substantially) higher pressure than the second electric pump 22. In a first step 2001 friction elements are cooled and/or lubricated by means of controlling the flow and/or pressure in the second hydraulic circuit 20 using a flow control element 24. Controlling the flow may also involve controlling a flow distribution to different hydraulic lines, for example by means of a directional valve 28. In a second step 2002, the flow control element 24 is operated using hydraulic pressure from the first hydraulic circuit 2. As described above, the flow control element 24 may comprise a plurality of components, such as a pressure regulator 26 and a directional valve 28, wherein the pressure regulator 26 is arranged in the first hydraulic circuit 2, providing pilot pressure to the directional valve 28 which is arranged in the second hydraulic circuit 20. A pilot pressure line 46 maybe arranged between the pressure regulator 26 and the directional valve 28, see inter alia in the embodiments of fig. 10.
Fig. 13 shows a block diagram of a method 3000 for actuating hydraulic actuators associated with two or more friction elements of a vehicle transmission using a first hydraulic circuit 2. In a first step 3001, hydraulic fluid is supplied to the first hydraulic circuit 2 using a first electric driven pump 4. In a second step
3002, pressure in the first hydraulic circuit is controlled by providing a flow restriction in the first hydraulic circuit 2 between the first electric pump 4 and a reservoir. In this way, leakage of hydraulic fluid into the reservoir is provided, see third step 3003. In a fourth step 3004, a speed of the first electric driven pump is controlled. Preferably the reservoir is a sump.
Fig. 14 shows a block diagram of a method 4000 for operating a park lock system of a vehicle transmission. In a first step 4001, a line pressure is generated using a first hydraulic circuit 2. In a second step 4002, a park lock system is released or disengaged using a hydraulic actuator. The hydraulic actuator is hydraulically connected to the first hydraulic circuit 2. In a third step 4003, the hydraulic actuator is directly actuated using the line pressure.
Herein, the invention is described with reference to specific examples of embodiments of the invention. It will, however, be evident that various modifications and changes maybe made therein, without departing from the essence of the invention. For the purpose of clarity and a concise description features are described herein as part of the same or separate examples or embodiments, however, alternative embodiments having combinations of all or some of the features described in these separate embodiments are also envisaged.
The transmission system may be implemented in a vehicle, such as cars, recreational vehicles, trucks, buses, bicycles, motorcycles, lawn mowers, agricultural vehicles, construction vehicles, golf carts, trolleys and robotic vehicles. Other vehicles are possible as well. The shown embodiments involved vehicles comprising four wheels, however vehicles with a different number of wheels can be utilized. It also perceivable that a plurality of transmission systems are included in a vehicle.
Actuation of the coupling members may be performed by means of a hydraulic actuation system. However other embodiments may include actuation by means of mechanical, electromechanical or electro-hydraulic systems. A combination of actuation systems for the different components of the transmission are also envisaged.
The motor or engine of the vehicle comprising the transmission system according the current invention may include any combination of an internal combustion engine and an electric motor. Other motors and engines are possible as well such as a fuel-cell motor. In some embodiments, the motor is a hybrid engine and/or could include multiple types of engines and/or motors. For instance, a gas26 electric hybrid car could include a gasoline engine and an electric motor. Other examples are possible.
It will be appreciated that the methods may include computer implemented steps. Embodiments may comprise computer apparatus, wherein processes performed in computer apparatus. The invention also extends to computer programs, particularly computer programs on or in a carrier, adapted for putting the invention into practice. The program may be in the form of source or object code or in any other form suitable for use in the implementation of the processes according to the invention. The carrier may be any entity or device capable of carrying the program. For example, the carrier may comprise a storage medium, such as a ROM, for example a semiconductor ROM or hard disk. Further, the carrier may be a transmissible carrier such as an electrical or optical signal which may be conveyed via electrical or optical cable or by radio or other means, e.g. via the internet or cloud.
Some embodiments may be implemented, for example, using a machine or tangible computer-readable medium or article which may store an instruction or a set of instructions that, if executed by a machine, may cause the machine to perform a method and/or operations in accordance with the embodiments.
Various embodiments may be implemented using hardware elements, software elements, or a combination of both. Examples of hardware elements may include processors, microprocessors, circuits, application specific integrated circuits (ASIC), programmable logic devices (PED), digital signal processors (DSP), field programmable gate array (FPGA), logic gates, registers, semiconductor device, microchips, chip sets, et cetera. Examples of software may include software components, programs, applications, computer programs, application programs, system programs, machine programs, operating system software, mobile apps, middleware, firmware, software modules, routines, subroutines, functions, computer implemented methods, procedures, software interfaces, application program interfaces (API), methods, instruction sets, computing code, computer code, et cetera.
Herein, the invention is described with reference to specific examples of embodiments of the invention. It. will, however, be evident that various modifications, variations, alternatives and changes may be made therein, without departing from the essence of the invention. For the purpose of clarity and a concise description features are described herein as part of the same or separate embodiments, however, alternative embodiments having combinations of all or some of the features described in these separate embodiments are also envisaged and understood to fall within the framework of the invention as outlined by the claims. The specifications, figures and examples are, accordingly, to be regarded in an illustrative sense rather than in a restrictive sense. The invention is intended to embrace all alternatives, modifications and variations which fall within the spirit and scope of the appended claims. Further, many of the elements that are described are functional entities that may be implemented as discrete or distributed components or in conjunction with other components, in any suitable combination and location.
In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word comprising’ does not exclude the presence of other features or steps than those listed in a claim. Furthermore, the words ‘a’ and ‘an’ shall not be construed as limited to ‘only one’, but instead are used to mean ‘at least one’, and do not exclude a plurality. The mere fact that certain measures are recited in mutually different claims does not indicate that a combination of these measures cannot be used to an advantage.

Claims (32)

ConclusiesConclusions 1. Hydraulisch systeem voor een voertuigtransmissie, waarbij de transmissie is voorzien van twee of meer frictie-elementen, en het hydraulisch systeem omvattende:A hydraulic system for a vehicle transmission, wherein the transmission is provided with two or more friction elements, and the hydraulic system comprising: een eerste hydraulisch circuit ingericht voor het actueren van de twee ofa first hydraulic circuit adapted to actuate the two or 5 meer frictie-elementen;5 more friction elements; een eerste elektrisch aangedreven pomp, ingericht voor het toevoeren van hydraulisch fluïdum aan het eerste hydraulische circuit; en een flowrestrictieaangebracht in het eerste hydraulische circuit tussen een uitgang van de eerste elektrisch aangedreven pomp en een reservoir om lekkage vana first electrically driven pump, arranged for supplying hydraulic fluid to the first hydraulic circuit; and a flow restriction provided in the first hydraulic circuit between an output of the first electrically driven pump and a reservoir to prevent leakage of 10 hydraulisch fluïdum te voorzien in het reservoir.Provide hydraulic fluid in the reservoir. 2. Hydraulisch systeem volgens conclusie 1, verder omvattende:The hydraulic system of claim 1, further comprising: een tweede hydraulisch circuit ingericht voor het smeren en/of koelen van de twee of meer frictie-elementen;a second hydraulic circuit adapted for lubricating and / or cooling the two or more friction elements; 15 een tweede elektrische pomp ingericht voor het toevoeren van hydraulisch fluïdum aan het tweede hydraulische circuit, waarbij de eerste elektrische pomp is ingericht voor het leveren van een hogere druk dan de tweede elektrische pomp; en een flowre gelelement ingericht voor het regelen van de stroom en/of druk in het tweede hydraulische circuit, waarbij het flowregelelement wordt bediend metA second electric pump adapted to supply hydraulic fluid to the second hydraulic circuit, the first electric pump being adapted to deliver a higher pressure than the second electric pump; and a flow control element adapted to control the flow and / or pressure in the second hydraulic circuit, the flow control element being operated with 20 behulp van hydraulische druk uit het eerste hydraulische circuit.20 using hydraulic pressure from the first hydraulic circuit. 3. Hydraulisch systeem voor een voertuigtransmissie, waarbij de transmissie is voorzien van twee of meer frictie-elementen en twee of meer hydraulische actuatoren, waarbij het hydraulisch systeem omvat:3. A hydraulic system for a vehicle transmission, wherein the transmission is provided with two or more friction elements and two or more hydraulic actuators, the hydraulic system comprising: 25 een eerste hydraulisch circuit ingericht voor het actueren van de twee of meer hydraulische actuatoren;A first hydraulic circuit adapted to actuate the two or more hydraulic actuators; een tweede hydraulisch circuit ingericht voor het smeren en/of koelen van de twee of meer frictie-elementen;a second hydraulic circuit adapted for lubricating and / or cooling the two or more friction elements; een eerste elektrisch aangedreven pomp, ingericht voor het toevoeren van hydraulisch fluïdum aan het eerste hydraulische circuit;a first electrically driven pump, arranged for supplying hydraulic fluid to the first hydraulic circuit; een tweede elektrisch aangedreven pomp ingericht voor het toevoeren van hydraulisch fluïdum aan het tweede hydraulische circuit, waarbij de eerste elektrisch aangedreven pomp is ingericht om een hogere druk te leveren dan de tweede elektrisch aangedreven pomp; en een flowregelelement, ingericht voor het regelen van de stroom en/of druk in het tweede hydraulische circuit, waarbij het flowregelelement wordt bediend met behulp van hydraulische druk uit het eerste hydraulische circuit.a second electrically driven pump adapted for supplying hydraulic fluid to the second hydraulic circuit, the first electrically driven pump being arranged to supply a higher pressure than the second electrically driven pump; and a flow control element adapted to control the flow and / or pressure in the second hydraulic circuit, wherein the flow control element is operated with the aid of hydraulic pressure from the first hydraulic circuit. 4. Hydraulisch systeem volgens conclusie 3, waarbij het eerste hydraulische circuit een flowrestrictie omvat voor het bepalen van een druk in het eerste hydraulische circuit, stroomopwaarts van de flowrestrictie, aangebracht tussen een uitgang van de eerste elektrisch aangedreven pomp en een reservoir om lekkage van het hydraulische fluïdum te voorzien in het reservoir.The hydraulic system of claim 3, wherein the first hydraulic circuit comprises a flow restriction for determining a pressure in the first hydraulic circuit, upstream of the flow restriction, arranged between an output of the first electrically driven pump and a reservoir for leakage of the provide hydraulic fluid in the reservoir. 5. Hydraulisch systeem volgens één van de conclusies 1-4, waarbij hydraulisch fluïdum dat door de flowrestrictie stroomt ten minste gedeeltelijk wordt gebruikt voor het actief smeren van transmissie-onderdelen.The hydraulic system of any one of claims 1-4, wherein hydraulic fluid flowing through the flow restriction is used at least partially for active lubrication of transmission parts. 6. Hydraulisch systeem volgens één van de conclusies 1-5, waarbij de flowrestrictie een vaste geometrie heeft.The hydraulic system of any one of claims 1-5, wherein the flow restriction has a fixed geometry. 7. Hydraulisch systeem volgens één van de conclusies 1 - 6, waarbij het eerste hydraulische circuit ten minste twee regelelementen omvat, ingericht voor het actueren van de twee of meer frictie-elementen, waarbij de regelelementen worden bediend met behulp van hydraulische druk uit het eerste hydraulische circuit.A hydraulic system according to any one of claims 1 to 6, wherein the first hydraulic circuit comprises at least two control elements, arranged for actuating the two or more friction elements, wherein the control elements are operated with the aid of hydraulic pressure from the first hydraulic circuit. 8. Hydraulisch systeem volgens één van de conclusies 1 - 7, omvattende een controller ingericht voor het regelen van hydraulische druk in het eerste hydraulische circuit door de stroom van hydraulisch fluïdum door de tlowrestrictie te regelen.A hydraulic system according to any one of claims 1 to 7, comprising a controller adapted to control hydraulic pressure in the first hydraulic circuit by controlling the flow of hydraulic fluid through the flow restriction. 9. Hydraulisch systeem volgens conclusie 8, waarbij de controller is ingericht voor het regelen van een snelheid van de eerste elektrisch aangedreven pomp.The hydraulic system of claim 8, wherein the controller is adapted to control a speed of the first electrically driven pump. 10. Hydraulisch systeem volgens één van de conclusies 1 - 9, waarbij het eerste hydraulische circuit vrij is van een hydraulische fluïdumaccumulator.The hydraulic system of any one of claims 1 to 9, wherein the first hydraulic circuit is free from a hydraulic fluid accumulator. 11. Hydraulisch systeem volgens één van de conclusies 1 tot 10, waarbij het eerste hydraulische circuit vrij is van een overdrukventiel, ingericht voor het instellen van de hydraulische druk in het eerste hydraulische circuit.The hydraulic system of any one of claims 1 to 10, wherein the first hydraulic circuit is free from a pressure relief valve adapted to adjust the hydraulic pressure in the first hydraulic circuit. 12. Hydraulisch systeem volgens één van de conclusies 8-10, waarbij de controller is ingericht voor het draaien van de eerste elektrisch aangedreven pomp in slechts één richting.The hydraulic system of any one of claims 8-10, wherein the controller is adapted to rotate the first electrically driven pump in only one direction. 13. Hydraulisch systeem volgens één van de voorgaande conclusies, waarbij het flowregelelement en/of de minstens twee regelelementen een elektrische regelingang omvat(ten).13. Hydraulic system as claimed in any of the foregoing claims, wherein the flow control element and / or the at least two control elements comprise an electrical control input. 14. Hydraulisch systeem volgens één van de conclusies 1 - 13, waarbij het eerste hydraulische circuit is ingericht voor het genereren van een lijndruk.The hydraulic system of any one of claims 1 to 13, wherein the first hydraulic circuit is adapted to generate a line pressure. 15. Hydraulisch systeem volgens één van de conclusies 1 - 14, waarbij een van de twee of meer hydraulische actuatoren is ingericht voor het aandrijven van een parklock systeem, waarbij genoemde hydraulische actuator hydraulisch in verbinding staat met het eerste hydraulische circuit voor directe actuatie van de hydraulische actuator met behulp van de lijndruk.A hydraulic system according to any of claims 1 to 14, wherein one of the two or more hydraulic actuators is adapted to drive a parklock system, said hydraulic actuator being hydraulically connected to the first hydraulic circuit for direct actuation of the hydraulic actuator using the line pressure. 16. Hydraulisch systeem voor een voertuigtransmissie, omvattende:16. A hydraulic system for a vehicle transmission, comprising: een eerste hydraulisch circuit, ingericht voor het genereren van een lijndruk; en een hydraulische actuator, ingericht voor het activeren van een parklock systeem, waarbij de hydraulische actuator hydraulisch in verbinding staat met het eerste hydraulische circuit voor directe actuatie van de hydraulische actuator met behulp van de lijndruk.a first hydraulic circuit adapted to generate a line pressure; and a hydraulic actuator adapted to activate a parklock system, the hydraulic actuator being hydraulically connected to the first hydraulic circuit for direct actuation of the hydraulic actuator using the line pressure. 17. Hydraulisch systeem volgens conclusie 15 of 16, waarbij de hydraulische actuator is ingericht voor het in een parkeerstand brengen of houden van het parklock systeem wanneer de lijndruk lager is dan een vooraf bepaalde drukdrempel.A hydraulic system according to claim 15 or 16, wherein the hydraulic actuator is adapted to bring or keep the parklock system in a parking position when the line pressure is lower than a predetermined pressure threshold. 18. Hydraulisch systeem volgens conclusie 17, waarbij het eerste hydraulische circuit een ventiel omvat, ingericht voor het draineren van de hydraulische actuator wanneer de lijndruk lager is dan een vooraf bepaalde drukdrempel.The hydraulic system of claim 17, wherein the first hydraulic circuit comprises a valve adapted to drain the hydraulic actuator when the line pressure is lower than a predetermined pressure threshold. 19. Hydraulisch systeem volgens conclusie 15 of 16, waarbij de hydraulische actuator is ingericht voor het in een niet-parkeerstand brengen of houden van het parklock systeem, wanneer de lijndruk lager is dan een vooraf bepaalde drukdrempel.A hydraulic system according to claim 15 or 16, wherein the hydraulic actuator is adapted to bring or keep the parklock system in a non-parking position when the line pressure is lower than a predetermined pressure threshold. 20. Hydraulisch systeem volgens conclusie 15 of 16, waarbij de hydraulische actuator een actuator omvat, ingericht voor het in een parkeerstand of nietparkeerstand houden van het parklock systeem, volgens een laatste invoer van een bediener van het hydraulische systeem, wanneer de lijndruk lager is dan een vooraf bepaalde drukdrempel.A hydraulic system according to claim 15 or 16, wherein the hydraulic actuator comprises an actuator adapted to hold the parklock system in a parking position or non-parking position, according to a final input from an operator of the hydraulic system, when the line pressure is lower than a predetermined pressure threshold. 21. Hydraulisch systeem volgens één van de conclusies 15 - 20, omvattende een terugslagventiel omvat tussen de eerste hydraulische pomp en de hydraulische actuator.A hydraulic system as claimed in any one of claims 15 to 20, comprising a check valve comprising between the first hydraulic pump and the hydraulic actuator. 22. Voertuigtransmissie, omvattende een hydraulisch systeem volgens één van de conclusies 1 - 21.A vehicle transmission, comprising a hydraulic system according to any one of claims 1 to 21. 23. Voertuigtransmissie volgens conclusie 22, voor zover afhankelijk van één23. Vehicle transmission according to claim 22, insofar as dependent on one 5 van de conclusies 15 - 20, dat mechanische middelen omvat om het parklock systeem van een parkeerstand naar een niet-parkeerstand te brengen, wanneer de lijndruk lager is dan een vooraf bepaalde drukdrempel.5 of claims 15-20, comprising mechanical means for moving the parklock system from a parking position to a non-parking position when the line pressure is lower than a predetermined pressure threshold. 24. Werkwijze voor het genereren van een lijndruk in een voertuigtransmissie,24. Method for generating a line pressure in a vehicle transmission, 10 dat een eerste hydraulisch circuit omvat, ingericht voor het actueren van twee of meer frictie-elementen, waarbij de werkwijze omvattende:10 comprising a first hydraulic circuit adapted to actuate two or more friction elements, the method comprising: het toevoeren van hydraulisch fluïdum naar het eerste hydraulische circuit met behulp van een eerste pomp; en het gebruik maken van een flowrestrictie aangebracht in het eerstesupplying hydraulic fluid to the first hydraulic circuit using a first pump; and using a flow restriction arranged in the first 15 hydraulische circuit tussen een uitgang van de eerste pomp en een reservoir om lekkage van hydraulisch fluïdum in het reservoir te voorzien voor het genereren van lijndruk.Hydraulic circuit between an outlet of the first pump and a reservoir to provide hydraulic fluid leakage in the reservoir for generating line pressure. 25. Werkwijze volgens conclusie 24, omvattende het regelen van de lijndrukThe method of claim 24, comprising controlling the line pressure 20 door het regelen van een stroomsnelheid van de eerste pomp.20 by controlling a flow rate of the first pump. 26. Werkwijze volgens conclusie 24 of 25, omvattende het regelen van twee of meer actuatoren geassocieerd met de twee of meer frictie-elementen onder gebruikmaking van ten minste twee regelelement die worden bediend met behulpA method according to claim 24 or 25, comprising controlling two or more actuators associated with the two or more friction elements using at least two control element operated by means of 25 van de lijndruk.25 of the line pressure. 27. Werkwijze volgens één van de conclusies 24 - 26, omvattende:The method of any one of claims 24 to 26, comprising: het koelen en/of smeren van de frictie-elementen, onder gebruikmaking van een tweede hydraulisch circuit dat een tweede pomp omvat die daarmeecooling and / or lubricating the friction elements, using a second hydraulic circuit comprising a second pump which is thereby 30 geassocieerd is, door stroom en/of druk te regelen in het tweede hydraulische circuit onder gebruikmaking van een flowregelelement, waarbij het flowregelelement wordt bediend met behulp van de lijndruk.30 is associated by controlling flow and / or pressure in the second hydraulic circuit using a flow control element, wherein the flow control element is operated using the line pressure. 28. Werkwijze voor het koelen en/of smeren van frictie-elementen van een voertuigtransmissie, waarbij de voertuigtransmissie omvat een eerste hydraulisch circuit, ingericht voor het actueren van twee of meer hydraulische actuatoren geassocieerd met twee of meer frictie-elementen, een tweede hydraulisch circuit, ingericht voor het smeren en/of koelen van de twee of meer frictie-elementen, een eerste elektrische pomp, ingericht voor het toevoeren van hydraulisch fluïdum naar het eerste hydraulische circuit, en een tweede elektrisch aangedreven pomp, ingericht voor het toevoeren van hydraulisch fluïdum naai' het tweede hydraulische circuit, waarbij de eerste elektrische pomp is ingericht voor het leveren van een hogere druk dan de tweede elektrische pomp, waarbij de werkwijze het koelen en/of smeren omvat van de frictieelementen door het regelen van stroom en/of druk in het tweede hydraulische circuit onder gebruikmaking van een regelelement, waarbij het regelelement wordt bediend met behulp van hydraulische druk van het eerste hydraulische circuit.A method for cooling and / or lubricating friction elements of a vehicle transmission, wherein the vehicle transmission comprises a first hydraulic circuit, arranged for actuating two or more hydraulic actuators associated with two or more friction elements, a second hydraulic circuit , arranged for lubricating and / or cooling the two or more friction elements, a first electric pump, arranged for supplying hydraulic fluid to the first hydraulic circuit, and a second electrically driven pump, arranged for supplying hydraulic fluid sew the second hydraulic circuit, wherein the first electric pump is arranged to provide a higher pressure than the second electric pump, the method comprising cooling and / or lubricating the friction elements by controlling flow and / or pressure in the second hydraulic circuit using a control element, wherein the control element is operated with b e aid of hydraulic pressure of the first hydraulic circuit. 29. Werkwijze voor het actueren van hydraulische actuatoren geassocieerd met twee of meer frictie-elementen van een voertuigtransmissie onder gebruikmaking van een eerste hydraulisch circuit, waarbij de werkwijze omvat het toevoeren van hydraulisch fluïdum naar het eerste hydraulische circuit onder gebruikmaking van een eerste elektrisch aangedreven pomp; en het regelen van druk van het eerste hydraulische circuit door een flowrestrictie te verschaffen in het eerste hydraulische circuit tussen de eerste elektrische pomp en een reservoir om lekkage van hydraulisch fluïdum te voorzien in het reservoir en een snelheid van de eerste elektrisch aangedreven pomp te regelen.A method for actuating hydraulic actuators associated with two or more frictional elements of a vehicle transmission using a first hydraulic circuit, the method comprising supplying hydraulic fluid to the first hydraulic circuit using a first electrically driven pump ; and controlling pressure of the first hydraulic circuit by providing a flow restriction in the first hydraulic circuit between the first electric pump and a reservoir to provide hydraulic fluid leakage into the reservoir and control a speed of the first electrically driven pump. 30. Werkwijze volgens één van de conclusies 24 - 29, omvattende:The method of any one of claims 24 to 29, comprising: het vrijgeven van een parklock systeem onder gebruikmaking van een hydraulische actuator verbonden met het eerste hydraulische circuit, die de hydraulische actuator direct actueert met behulp van de lijndruk.releasing a parklock system using a hydraulic actuator connected to the first hydraulic circuit which directly actuates the hydraulic actuator using the line pressure. 55 31. Werkwijze voor het bedienen van een parklock systeem van een voertuigtransmissie, omvattende:A method of operating a parklock system of a vehicle transmission, comprising: het genereren, onder gebruikmaking van een eerste hydraulisch circuit, van een lijndruk; en het vrijgeven van een parklock systeem onder gebruikmaking van eengenerating, using a first hydraulic circuit, a line pressure; and releasing a parklock system using a 10 hydraulische actuator die hydraulisch in verbinding staat met het eerste hydraulische circuit, en die de hydraulische actuator direct actueel! met behulp van de lijndruk.10 hydraulic actuator that is hydraulically connected to the first hydraulic circuit, and that immediately updates the hydraulic actuator! using the line pressure. 32. Een voertuig omvattende een voertuigtransmissie volgens conclusie 22.A vehicle comprising a vehicle transmission according to claim 22. (1/14) _Q CXI (2/14) (3/14) (4/14) (5/14)(1/14) _Q CXI (2/14) (3/14) (4/14) (5/14) Ί (6/14) (7/14) (8/14)Ί (6/14) (7/14) (8/14) O LO (9/14) (10/14) (11/14) o oO LO (9/14) (10/14) (11/14) o o CXI o oCXI o o 1000 (12/14)1000 (12/14) O O CXIO O CXI CXI o o CXI (N ώCXI o o CXI (N ώ • ι—I (13/14) öb • i—I• ι — I (13/14) öb • i — I τ- τ- CXI CXI 00 00 Ο Ο o O o O o O o O o O 00 00 00 00 00 00
Control a speed of the first 3004 electric driven pump______________ (14/14)Control a speed of the first 3004 electric driven pump______________ (14/14) 40004000 CO o oCO o o ω ω O ♦ w O ♦ w CZ2 CZ2 CZ2 CZ2 cö co ω ω Fh Fh Fh Fh Ό Ό P P o O -C -C Ö O ω ω * w * w Λ s—> Λ s—> ω ω o O Λ Λ cö co öi öi ö O ♦ w ♦ w o O CZ2 CZ2 CÖ CO o O s—> s—> o O cö co ω Fh ♦ w Q ω Fh ♦ w Q B g B g
Title: A hydraulic system for a vehicle, a vehicle transmission, and method for operating a vehicle transmissionTitle: A hydraulic system for a vehicle, a vehicle transmission, and method for operating a vehicle transmission
NL2018732A 2017-04-18 2017-04-18 a hydraulic system for a vehicle, a vehicle transmission, and method for operating a vehicle transmission NL2018732B1 (en)

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PCT/EP2018/059931 WO2018192989A1 (en) 2017-04-18 2018-04-18 A hydraulic system for a vehicle, a vehicle transmission, and method for operating a vehicle transmission
CN201880040422.8A CN110785585B (en) 2017-04-18 2018-04-18 Hydraulic system for a vehicle, vehicle transmission and method for operating a vehicle transmission
US16/604,587 US11585436B2 (en) 2017-04-18 2018-04-18 Hydraulic system for a vehicle, a vehicle transmission, and method for operating a vehicle transmission
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EP3612754B1 (en) 2022-10-19
CN110785585B (en) 2022-04-05
NL2020576B1 (en) 2018-11-06
US11585436B2 (en) 2023-02-21
US20200378492A1 (en) 2020-12-03
CN110785585A (en) 2020-02-11
EP3612754A1 (en) 2020-02-26

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