DE102013109299A1 - Vehicle with variable oil pump - Google Patents

Abstract

A vehicle with a variable hydraulic pump (135) may have a sun gear (110) that receives torque from a power source through an input shaft (160), a ring gear (140) whose inner circumference is spaced from an outer circumference of the sun gear ( 110), a planet gear (105) which is arranged between the inner circumference of the ring gear (140) and the outer circumference of the sun gear (110), a carrier (115) which is connected to an output shaft (120), a hydraulic pump ( 135), which pumps oil by means of the output shaft (120) which is connected to the carrier (115), and a motor (145) which is arranged outside the ring gear (140) and which selectively rotates the ring gear (140).

Description

Reference to related application

The present application claims the priority of Korean Patent Application No. 10-2013-0025571 , filed on Mar. 11, 2013, the entire contents of which are incorporated herein for all purposes by this reference.

Background of the invention

Field of the invention

The present invention relates to a vehicle having a variable (eg, variable) hydraulic pump that variably changes the load of the hydraulic pump for generating hydraulic pressure necessary for an internal combustion engine or a transmission to reduce energy loss and cost.

Description of the related art

Recently, techniques for reducing fuel consumption have been researched to reduce CO ₂ emissions, and an ISG system (ISG for "idle stop-and-go" such as idle-stop-start system, e.g. B. Stop-Start-Automatik) switches off an internal combustion engine in a predetermined stop state (or if (a) predetermined stop condition (s) is / are met) and starts the engine in a predetermined restart (z B. Reboot) state again.

The ISG system uses information such as the vehicle speed, the engine speed, the coolant temperature, etc., to stop the engine in a predetermined state, and thereafter enables normal running by restarting the engine in the event that a vehicle condition requires or permits the restart of the internal combustion engine.

The ISG system stops an internal combustion engine to enter an idling stop state when an engine is sufficiently warmed up, a coolant temperature is higher than a predetermined value, the vehicle speed is low or zero (0), a gear shift position is neutral. Idle is, and a brake pedal is pressed for a predetermined time.

The ISG device can increase the fuel consumption efficiency of a vehicle by up to 5 to 15%. In general, an automatic transmission (A) needs a motorized (eg, engine-operated) hydraulic pump that provides oil pressure to the automatic transmission in the idle-stop state of a vehicle having an ISG system.

Accordingly, the vehicle having an automatic transmission and an ISG system has a mechanical pump arranged in the automatic transmission to be operated by an internal combustion engine in the state where the ISG is not operating (ie, the internal combustion engine is running, for example ), and which generates the hydraulic pressure necessary for controlling the automatic transmission, and a motorized auxiliary hydraulic pump operating in the state where the ISG is operated (that is, for example, when the engine is off); to generate hydraulic pressure for the automatic transmission.

The vehicle having the automatic transmission and the ISG system has two pumps, one of which is a mechanical pump and the other is a motorized auxiliary hydraulic pump, wherein the mechanical pump is operated during operation of the internal combustion engine, and wherein the motorized Auxiliary hydraulic pump is operated alternatively when the internal combustion engine is not working or not running.

The vehicle having the automatic transmission and the ISG system must have two pumps having the same function, therefore, the vehicle cost is increased, the vehicle weight is also increased, and the fuel consumption is deteriorated.

The information disclosed in this Background of the Invention section is only for enhancement of understanding of the general background of the invention and should not be construed as an affirmation or any form of suggestion that this information is prior art as it the skilled person is already known form.

Brief description of the invention

The present invention has been made in an effort to provide a vehicle having a variable hydraulic pump that has the advantages that the energy loss due to the hydraulic pump, the fuel consumption, and the fluctuation of the hydraulic pressure are reduced by optimally controlling the load (eg, the input power or the pump speed) of the hydraulic pump.

A vehicle having a variable hydraulic pump according to various aspects of the present invention may include a sun gear that receives torque from a power source via an input shaft, a ring gear (eg, a ring gear), an inner periphery thereof Spaced to an outer periphery of the sun gear, a planetary gear (eg, a planetary gear set) disposed between the inner circumference of the ring gear and the outer circumference of the sun gear has a carrier (eg, planetary carrier) connected to an output shaft a hydraulic pump that pumps oil through the output shaft that is connected to the carrier (eg, is connected to the carrier or planetary gear set) (eg, by means of the output shaft); pumped by the rotation / movement of the output shaft, eg, pumping through the output shaft), and a motor (eg, auxiliary motor, for example, electric motor) disposed outside the ring gear to selectively rotate the ring gear, and drive.

The vehicle having the variable hydraulic pump may further include a shaft one-way clutch (eg, shaft one-way clutch) configured to cause the input shaft to rotate in (only) one (single) direction , and a ring gear one-way clutch (eg, ring gear freewheel) configured to rotate the ring gear in the other (for example, opposite) direction. The power source may be an internal combustion engine or a motor, e.g. B. electric motor, be.

The vehicle having the variable hydraulic pump may further include a controller that controls the engine in response to a rotational speed of the input shaft so as to control the hydraulic pump at a predetermined optimized (eg, optimal) rotational speed. The engine may be operated at a predetermined speed so that the pump is operated at a minimum speed in an idle-stop state (of the vehicle or the primary power source (eg, internal combustion engine) thereof). A compensation value may be applied to a target speed of the hydraulic pump (eg, added to or subtracted from the target speed) depending on the oil temperature when the power source is operated.

According to various aspects of the present invention, in a vehicle having a variable hydraulic pump, the rotational speed of the hydraulic pump is optimally controlled by means of an engine according to the rotational speed or running state of an internal combustion engine (or primary power source) to be able to operate the engine To reduce energy loss. Further, the fluctuation of the hydraulic pressure generated by the hydraulic pump is reduced to be able to improve the stability. Further, the compensation value according to the oil temperature is applied to be able to surely generate hydraulic pressure, and a motor (for example, single motor or one) (eg, electric motor) is used to optimize the load of the hydraulic pump to control.

The methods and apparatus of the present invention have other features and advantages as described in more detail or apparent from the drawings, which are incorporated herein and the following detailed description, which together serve to explain certain principles of the present invention ,

Brief description of the figures

The 1 FIG. 12 is a schematic sectional view of an exemplary variable displacement hydraulic pump disposed in a vehicle according to the present invention. FIG.

The 2 FIG. 12 is a schematic diagram of an exemplary variable hydraulic pump disposed in a vehicle according to the present invention. FIG.

The 3 FIG. 12 is a schematic diagram showing an operation method of an exemplary variable-displacement hydraulic pump disposed in a vehicle according to the present invention. FIG.

The 4 FIG. 12 is a graph showing a compensation value that varies depending on an oil temperature in an exemplary variable displacement hydraulic pump according to the present invention. FIG.

The 5 FIG. 12 is a flowchart showing a control method of an exemplary variable-displacement hydraulic pump disposed in a vehicle according to the present invention. FIG.

The 6A . 6B . 6C and 6D FIG. 12 are schematic diagrams showing operating states of a variable-displacement hydraulic pump of a vehicle according to the present invention. FIG.

Detailed description

Reference will now be made in detail to the numerous embodiments of the present invention, examples of which are illustrated in the accompanying drawings and described below. Although the invention will be described in conjunction with exemplary embodiments, it will be understood that the present description is not intended to limit the invention to those exemplary embodiments. On the contrary, the invention is intended to cover not only the exemplary embodiments but also numerous Alternatives, modifications, equivalents, and other embodiments included within the spirit and scope of the invention as defined in the appended claims.

The 1 shows a schematic sectional view of a variable hydraulic pump, which is arranged in a vehicle, and the 2 FIG. 12 is a schematic diagram of a variable displacement hydraulic pump disposed in a vehicle according to various embodiments of the present invention. FIG. With reference to the 1 and 2 has a variable hydraulic pump of a vehicle on an internal combustion engine 100 as a power source or drive source, an input shaft 160 , a shaft one-way clutch 155 , a sun wheel 110 , a planetary gear 105 , a ring gear 140 , a ring gear one-way clutch 150 , a motor (for example electric motor) 145 , a carrier 115 , an output shaft 120 , a hydraulic pump 135 and a pump housing 165 , Furthermore, the pump housing has 165 a suction passage / channel 125 , through the oil in the hydraulic pump 135 is sucked, and an outlet passage / channel 130 through which the oil is discharged / expelled (for example, with pressure).

The torque of the internal combustion engine 100 gets over the input shaft 160 the sun wheel 110 supplied to the variable hydraulic pump and applied to this, and the shaft one-way clutch 155 is on an outer circumference of the input shaft 160 arranged so that the input shaft 160 only in one direction of rotation. The ring gear one-way clutch 150 is on an outer circumference of the ring gear 140 arranged so that the ring gear 140 only in the other, for example, opposite (for example, relative to the input shaft 160 ), Turning direction. The motor 145 turns the ring gear 140 in this other direction of rotation.

The torque acting on the input shaft 160 is applied, becomes the sun gear 110 , the planetary gear 105 , the ring gear 140 , the carrier 115 and the output shaft 120 transferred so that the hydraulic pump 135 Oil pumps. When the internal combustion engine 100 stops its operation, the engine turns 144 the ring gear 140 to the hydraulic pump 135 with / at a minimum load (for example, minimum torque / minimum speed) and when the internal combustion engine 100 the input shaft 160 slower than a predetermined speed, the engine operates 141 the hydraulic pump 135 with a predetermined optimized (for example optimal) load.

With reference to the 2 can the hydraulic pump 135 be one of several types or types of pumps. For example, according to various embodiments of the present invention, the hydraulic pump may utilize a trochoidal (e.g., cycloidal) internal gear, e.g. B. a pump of the type with eccentric, z. B. trochoidal, internal gear.

The 3 FIG. 12 is a schematic diagram showing an operation method of a variable displacement hydraulic pump disposed in a vehicle according to various embodiments of the present invention. FIG. With reference to the 3 "Ne" denotes a rotational speed of the internal combustion engine 100 or a rotational speed of the output shaft 120 or a speed of the sun gear 110 , "Np" denotes a rotational speed of the hydraulic pump 135 or the carrier 115 , "Nm" denotes a speed of the motor 145 or the ring gear 140 , "Zs" indicates the number of teeth of the sun gear 110 , and "Zr" denotes the number of teeth of the ring gear 140 ,

A speed Np of the hydraulic pump 130 is determined / determined by means of a lever principle, which means that Np can be determined by means of a rotational speed Ne of the internal combustion engine 100 , a speed Nm of the engine 145 , the tooth number Zs of the sun gear 110 and the number of teeth Zr of the ring gear 140 , That means when the speed of the engine 145 is increased, in the state in which the speed of the internal combustion engine 100 is fixed or constant, the speed of the hydraulic pump 135 increased, and when the speed of the internal combustion engine 100 in the state in which the speed of the engine 145 is fixed or constant, is increased, the rotational speed of the hydraulic pump 135 elevated.

The 4 FIG. 12 is a graph showing a balance value varied in a variable hydraulic pump according to various embodiments of the present invention depending on the oil temperature. FIG. With reference to the 4 denotes a horizontal axis, the oil temperature and a vertical axis denotes a compensation value alpha (α). The alpha value is used to set the target speed of the hydraulic pump 135 to control. The method of using the compensation value will be described with reference to FIGS 5 further described.

The 5 FIG. 12 is a flowchart showing a control method of a variable hydraulic pump disposed in a vehicle according to various embodiments of the present invention. With reference to the 5 For example, the control (eg, control) is started in step S500, and it is determined (for example, determined, for example, decided) in step S510 whether the engine is running 145 normal (ie eg that no error signal of the motor 145 present) works or not. The method of determining whether the engine 145 works normally or not known art, and therefore, a detailed description thereof is omitted in the present invention. If it is determined / determined that the engine 145 is not functioning normally, an error code is generated in step S570, and the engine 100 is operated in a predetermined error mode in step S580. This is the engine 145 not operated, and the hydraulic pump 135 is by means of the internal combustion engine 100 operated.

In steps S520 and S530, it is determined (for example, determined, for example, decided) whether a vehicle is in an idle-stop (ISG) condition (i.e., is in an idle-stop state, for example). The idling stop condition (a condition in which the engine is stopped in an idling state) may be determined by means of a vehicle speed and a brake operating force. For example, the ISG condition is satisfied when a vehicle speed is less than or equal to a predetermined base value (ISG reference value) and a brake operating force is greater than or equal to a predetermined value (ISG reference value). If the vehicle is not in an idle-stop condition, step S550 is executed, and if the vehicle is in the idle-stop condition, step S540 is executed.

If determined (for example, determined, for example, decided) in step S540, that is the internal combustion engine 100 is stopped and Ne is zero (0), step S590 is executed. The speed (Nm) of the motor 145 is held at a predetermined value (N_isg) in step S590. If it is determined / determined in step S540 that the rotational speed Ne of the internal combustion engine 100 is not zero (0), it is determined (for example, determined, for example, decided) in step S550 whether the oil temperature is higher than a reference value. If it is determined that the oil temperature is higher than a reference value, step S560 is executed, and if it is determined that the oil temperature is lower than a reference value, step S595 is executed.

In step S560, a rotation speed (Nm) of the engine becomes 145 calculated by means of a control means via the formula -Zs / Zr · (Ne - (Np + α)) - (Np + α). In step S595, a rotational speed (Nm) of the engine becomes 145 calculated by means of a control device via the formula -Zs / Zr · (Ne-Np) -Np.

The 6A . 6B . 6C and 6D 12 are schematic diagrams showing operating states of a variable-displacement hydraulic pump of a vehicle according to various embodiments of the present invention.

The 6A shows that, or as an internal combustion engine 100 is operated in an idle state, the speed of the engine 145 is kept relatively high (high state), so that the speed of the hydraulic pump 135 is maintained at a predetermined optimized value.

The 6B shows that, or as an internal combustion engine 100 is operated in a low-load state, the speed of the engine 145 in a relative middle state (for example, at a middle level, middle state), so that the rotational speed of the hydraulic pump 135 is maintained at a predetermined optimized value.

The 6C shows that, or as an internal combustion engine 100 is operated in a high-load state, wherein the rotational speed of the engine 145 is kept in a relatively low state (for example, at a low level, low-state) or the engine 145 not operated at all, so that the speed of the hydraulic pump 135 is maintained at a predetermined optimized value.

The 6D shows that and how the operation of an internal combustion engine 100 stopped, the speed of the engine 145 is maintained at an idle state, so that the speed of the hydraulic pump 135 is maintained at a predetermined optimized value.

In various embodiments of the present invention, the engine may be considered to be the stator of a general engine unit (eg, electric motor unit), and the ring gear may be considered as the rotor of the engine unit.

For ease of explanation and detailed definition in the appended claims, the terms "inner," "outer," and other positional, etc., are used to describe the features of the exemplary embodiments with respect to the positions of those features, as illustrated in the figures , to describe.

The above description of specific exemplary embodiments of the present invention has been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the invention to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teachings. The exemplary embodiments have been selected and described to describe certain principles of the invention and the practical application thereof so as to enable those skilled in the art to numerous exemplary embodiments of the present invention Invention, as well as numerous alternatives and modifications thereof, manufacture and use. It is intended that the scope of the invention be defined by the claims appended hereto and their equivalents.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• KR 10-2013-0025571 [0001]

Claims (6)

Vehicle having a variable hydraulic pump ( 135 ), comprising: a sun gear ( 110 ), which receives torque from a power source via an input shaft (FIG. 160 ), a ring gear ( 140 ) whose inner circumference is at a distance from an outer circumference of the sun gear ( 110 ), a planetary gear ( 105 ), which between the inner circumference of the ring gear ( 140 ) and the outer periphery of the sun gear ( 110 ), a carrier ( 115 ), which is connected to an output shaft ( 120 ), a hydraulic pump ( 135 ), the oil pumps by means of the output shaft ( 120 ) with the carrier ( 115 ), and a motor, in particular an electric motor, ( 145 ) outside the ring gear ( 140 ) is arranged and the ring gear ( 140 ) selectively turns. Vehicle having a variable hydraulic pump ( 135 ) according to claim 1, further comprising: a shaft-disposable coupling ( 155 ), which is arranged so that the input shaft ( 160 ) rotates in one direction, and a ring gear one-way clutch ( 150 ), which is arranged so that the ring gear rotates in the other direction. Vehicle comprising a variable hydraulic pump according to claim 1 or 2, wherein the power source is an internal combustion engine ( 100 ) or a motor, in particular an electric motor is. Vehicle having a variable hydraulic pump ( 135 ) according to one of claims 1 to 3, further comprising a control device which controls the engine ( 145 ) in dependence on a rotational speed (Ne) of the input shaft ( 160 ) controls so that the hydraulic pump ( 135 ) is controlled to a predetermined, optimized speed. Vehicle comprising a variable hydraulic pump according to claim 4, wherein the engine ( 145 ) is operated at a predetermined speed, so that the hydraulic pump ( 135 ) is operated in a no-load stop state at a minimum speed. Vehicle comprising a variable hydraulic pump according to claim 4 or 5, wherein, depending on the temperature of the oil, a compensation value (α) to a target rotational speed of the hydraulic pump ( 135 ) is applied when the power source ( 100 ) is operated.

Images