WO2014076754A1 - 車両の停止制御装置 - Google Patents
車両の停止制御装置 Download PDFInfo
- Publication number
- WO2014076754A1 WO2014076754A1 PCT/JP2012/079359 JP2012079359W WO2014076754A1 WO 2014076754 A1 WO2014076754 A1 WO 2014076754A1 JP 2012079359 W JP2012079359 W JP 2012079359W WO 2014076754 A1 WO2014076754 A1 WO 2014076754A1
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- WO
- WIPO (PCT)
- Prior art keywords
- vehicle
- braking force
- cranking
- control device
- brake
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/17—Using electrical or electronic regulation means to control braking
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T7/00—Brake-action initiating means
- B60T7/12—Brake-action initiating means for automatic initiation; for initiation not subject to will of driver or passenger
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/58—Combined or convertible systems
- B60T13/588—Combined or convertible systems both fluid and mechanical assistance or drive
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/74—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive
- B60T13/741—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive acting on an ultimate actuator
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/17—Using electrical or electronic regulation means to control braking
- B60T8/172—Determining control parameters used in the regulation, e.g. by calculations involving measured or detected parameters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/24—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to vehicle inclination or change of direction, e.g. negotiating bends
- B60T8/245—Longitudinal vehicle inclination
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N11/00—Starting of engines by means of electric motors
- F02N11/08—Circuits specially adapted for starting of engines
- F02N11/0814—Circuits specially adapted for starting of engines comprising means for controlling automatic idle-start-stop
- F02N11/0818—Conditions for starting or stopping the engine or for deactivating the idle-start-stop mode
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N11/00—Starting of engines by means of electric motors
- F02N11/08—Circuits specially adapted for starting of engines
- F02N11/0814—Circuits specially adapted for starting of engines comprising means for controlling automatic idle-start-stop
- F02N11/0818—Conditions for starting or stopping the engine or for deactivating the idle-start-stop mode
- F02N11/0833—Vehicle conditions
- F02N11/0837—Environmental conditions thereof, e.g. traffic, weather or road conditions
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N11/00—Starting of engines by means of electric motors
- F02N11/08—Circuits specially adapted for starting of engines
- F02N11/0814—Circuits specially adapted for starting of engines comprising means for controlling automatic idle-start-stop
- F02N11/0818—Conditions for starting or stopping the engine or for deactivating the idle-start-stop mode
- F02N11/0833—Vehicle conditions
- F02N11/084—State of vehicle accessories, e.g. air condition or power steering
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N2200/00—Parameters used for control of starting apparatus
- F02N2200/08—Parameters used for control of starting apparatus said parameters being related to the vehicle or its components
- F02N2200/0801—Vehicle speed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N2200/00—Parameters used for control of starting apparatus
- F02N2200/08—Parameters used for control of starting apparatus said parameters being related to the vehicle or its components
- F02N2200/0807—Brake booster state
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N2200/00—Parameters used for control of starting apparatus
- F02N2200/10—Parameters used for control of starting apparatus said parameters being related to driver demands or status
- F02N2200/102—Brake pedal position
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N2200/00—Parameters used for control of starting apparatus
- F02N2200/12—Parameters used for control of starting apparatus said parameters being related to the vehicle exterior
- F02N2200/124—Information about road conditions, e.g. road inclination or surface
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Definitions
- the present invention relates to a vehicle stop control device that automatically stops and restarts an internal combustion engine while the vehicle is stopped, and controls the vehicle to increase its braking force.
- Patent Document 1 As a conventional vehicle stop control device of this type, for example, one disclosed in Patent Document 1 is known.
- the internal combustion engine mounted on the vehicle is of a so-called idle stop type that is stopped when a predetermined stop condition is satisfied and then restarted when a predetermined restart condition is satisfied.
- the vehicle includes a braking device that brakes the vehicle during normal driving, and further includes a hydraulic pump for increasing the braking force while the vehicle is stopped.
- the braking device includes a master cylinder that generates a brake fluid pressure in response to a depression operation of a brake pedal using negative pressure in an intake pipe, and a brake unit that is provided on each wheel and includes a wheel cylinder.
- the vehicle is braked by supplying the brake hydraulic pressure generated in the cylinder to the wheel cylinder via the hydraulic circuit.
- the hydraulic pump is provided in the middle of the hydraulic circuit and is driven by a motor.
- this stop control device when a restart condition such as release of the foot brake is satisfied during the automatic stop of the internal combustion engine, the internal combustion engine is cranked by supplying power from the battery to the starter motor. . During the cranking, the operation of the hydraulic pump by the motor is prohibited, so that electric power necessary for cranking is ensured. In addition, when it is detected that cranking has failed during restart and the foot brake is depressed, the hydraulic pump is driven by supplying electric power from the battery to the motor, thereby the wheel cylinder. By increasing the brake fluid pressure inside the vehicle and increasing the braking force of the vehicle, movement of the vehicle while stopped is prevented.
- the cranking when the restart condition is satisfied during the idle stop, the cranking is preferentially executed, and during this cranking, the hydraulic pump for increasing the braking force of the vehicle is executed. Operation is prohibited. For this reason, during cranking, the braking force of the vehicle decreases and becomes insufficient, so that the stopped vehicle may move, and the safety of the vehicle cannot be sufficiently achieved.
- the present invention has been made to solve such a problem, and can reliably prevent the movement of the stopped vehicle by reliably increasing the braking force of the vehicle during the idle stop.
- An object of the present invention is to provide a stop control device.
- the invention according to claim 1 of the present application stops the internal combustion engine 3 mounted on the vehicle V having the braking device 5 when a predetermined stop condition is satisfied, and performs a predetermined restart.
- a vehicle stop control device that restarts when a condition is satisfied and controls to increase the braking force of the vehicle V to supplement the braking force of the braking device 5 while the vehicle V is stopped.
- Cranking means for cranking the internal combustion engine 3 using electric power supplied from a predetermined power source (battery 7 in the embodiment (hereinafter the same in this section)) when the condition is satisfied;
- a braking force increasing device (hydraulic pump 55, electric brake 20) that is driven by electric power supplied from the power source to increase the braking force of the vehicle V, and a braking force increasing device while the vehicle V is stopped.
- the braking force increase necessity determining means ECU 2, FIG. 6) for determining whether the braking force of the vehicle V needs to be increased and the braking force of the vehicle V needs to be increased
- Control means (ECU2, steps 34 and 38 in FIG. 8) for operating the braking force increasing device, and the control means prohibits cranking when a restart condition is established during operation of the braking force increasing device. (Steps 6 to 9 in FIG. 5).
- This internal combustion engine is mounted on a vehicle and is automatically stopped when a predetermined stop condition is satisfied, and then automatically restarted when a predetermined restart condition is satisfied.
- the internal combustion engine is cranked by the cranking means using electric power supplied from a predetermined power source in order to restart the internal combustion engine.
- the braking force increasing device driven by the electric power supplied from the common power source with the cranking means is provided, and the braking force of the vehicle by the braking force increasing device while the vehicle is stopped.
- the braking force increasing device is activated. Further, cranking is prohibited when the restart condition is satisfied during the operation of the braking force increasing device.
- the cranking is prohibited and the braking force increasing device is continuously operated.
- the braking force increasing device is operated only when it is determined that the braking force of the vehicle needs to be increased, the braking force increasing device can be operated efficiently without wasting power. it can.
- the control means prohibits cranking until the operation of the braking force increasing device is completed, and the operation of the braking force increasing device is completed. In this case, cranking is started (steps 7 to 11 in FIG. 8).
- the control means increases the braking force when a predetermined time TBRREF has elapsed after starting the operation of the braking force increasing device. It is characterized by stopping the apparatus (steps 39 and 40 in FIG. 8).
- the braking force of the vehicle can be increased more reliably.
- the invention according to claim 4 is the vehicle stop control device according to claim 3, wherein the road surface gradient detecting means (acceleration sensor 67) for detecting the gradient ASLP of the road surface on which the vehicle V is stopped, and the detected road surface And a predetermined time setting means (ECU2) for setting the predetermined time TBRREF in accordance with the gradient ASLP.
- the road surface gradient detecting means acceleration sensor 67
- ECU2 predetermined time setting means
- the ease of movement of the vehicle during idle stop varies depending on the gradient of the road surface on which the vehicle is stopped, and the greater the road gradient, the easier the vehicle will move.
- the predetermined time which determines the actual operating time of a braking force increase apparatus is set according to the detected slope of the road surface. Therefore, the braking force increasing device can be operated for an appropriate time according to the ease of movement of the vehicle due to the road surface gradient.
- the braking device 5 is configured to brake the vehicle V with a brake hydraulic pressure supplied to the wheel cylinder 16. And further includes wheel cylinder pressure detecting means (wheel cylinder pressure sensor 62) for detecting the brake fluid pressure (wheel cylinder pressure PWC) in the wheel cylinder 16, and the braking force increase necessity determining means is configured to detect the detected wheel.
- wheel cylinder pressure detecting means wheel cylinder pressure sensor 62
- the brake fluid pressure of the cylinder falls below a predetermined pressure PREF, it is determined that it is necessary to increase the braking force by the braking force increasing device (steps 24 and 25 in FIG. 6).
- the braking device is configured to brake the vehicle by the brake fluid pressure supplied to the wheel cylinder, and when the detected brake fluid pressure in the wheel cylinder falls below a predetermined pressure. It is determined that the braking force needs to be increased by the braking force increasing device.
- the braking force increasing device can be appropriately operated according to the actual decrease state of the brake hydraulic pressure in the wheel cylinder that drives the braking device, and the necessary braking force can be effectively obtained.
- the brake fluid pressure in the wheel cylinder 16 exceeds the predetermined pressure PREF.
- the braking force increasing device is stopped (steps 39A and 40 in FIG. 10).
- the braking force increasing device can be stopped in a state where the brake fluid pressure in the wheel cylinder has actually sufficiently recovered. Can be reliably increased, and the braking force increasing device can be operated efficiently.
- the invention according to claim 7 is the vehicle stop control device according to claim 5 or 6, and road surface gradient detecting means (acceleration sensor 67) for detecting the road surface gradient ASLP on which the vehicle V is stopped. And a predetermined pressure setting means (ECU 2, step 23 in FIG. 6, FIG. 7) for setting the predetermined pressure PREF in accordance with the road surface gradient ASLP.
- the predetermined pressure for determining whether the braking force increasing device can be operated or stopped is set according to the detected road surface gradient. Therefore, based on the comparison result between the brake fluid pressure of the wheel cylinder and the set predetermined pressure, the operation or stop of the braking force increasing device can be appropriately controlled according to the ease of movement of the vehicle.
- the invention according to claim 8 is the vehicle stop control device according to any one of claims 1 to 4, further comprising vehicle speed detecting means (wheel speed sensor 64) for detecting the speed of the vehicle V (vehicle speed VP),
- vehicle speed detecting means wheel speed sensor 64
- the braking force increase necessity determination means is characterized in that when the detected vehicle speed is not 0, it is determined that the braking force needs to be increased by the braking force increasing device (steps 26 and 25 in FIG. 6). To do.
- the vehicle speed detection means is normally provided for controlling the vehicle and the internal combustion engine, the above-described operation can be obtained by using such an existing device without causing an increase in cost. be able to.
- FIG. 1 is a diagram schematically showing a vehicle to which the present invention is applied. It is sectional drawing which shows schematic structure of an electric brake. It is a circuit diagram which shows the structure of a braking device. It is a block diagram which shows the stop control apparatus of a vehicle. It is a flowchart which shows an idle stop control process. It is a flowchart which shows the increase necessity determination process of the braking force of a vehicle. 7 is a map used for setting a predetermined pressure in the process of FIG. 6. It is a flowchart which shows the braking force control process by embodiment. It is a timing chart which shows the operation example obtained by the process of FIG.5, FIG6 and FIG.8. It is a flowchart which shows the braking force control process by the modification of embodiment.
- FIG. 1 schematically shows a vehicle V to which the present invention is applied.
- the vehicle V is a front-wheel drive four-wheel vehicle having left and right front wheels WFL, WFR and left and right rear wheels WRL, WRR (hereinafter, collectively referred to as “wheel W”).
- An internal combustion engine (hereinafter referred to as “engine”) 3 mounted on the front, an automatic transmission 4 for shifting the power of the engine 3, a braking device 5 (see FIG. 3) for braking the vehicle V, and the like are provided. Yes.
- the engine 3 is a gasoline engine that is stopped when a predetermined stop condition is satisfied, and is restarted when a predetermined restart condition is satisfied, so-called idle stop is performed. .
- the engine 3 is started by rotating the crankshaft (not shown) by driving the starter motor 6 using electric power supplied from the battery 7 (see FIG. 4) and fuel injection. This is done by injecting fuel from the valve 8.
- the automatic transmission 4 includes a torque converter coupled to the crankshaft of the engine 3, a shift lever capable of selecting eight shift positions consisting of “1, 2, 3, D4, D5, N, R, and P”, A gear mechanism (none of which is shown in the figure) that can be switched to 6 types of gears including 1st to 5th speeds and reverse gears is provided.
- the output shaft (not shown) of the torque converter of the automatic transmission 4 is connected to the left and right front wheels WFL and WFR via the final reduction mechanism 8 and the left and right drive shafts 9 and 9, whereby the engine 3 Is transmitted to the front wheels WFL and WFR.
- the braking device 5 is a hydraulic type using a brake fluid such as hydraulic oil, and is provided on the brake pedal 11, the master cylinder 12, the hydraulic circuit 13, and each wheel W. And a disc brake 14 or the like.
- the disc brake 14 includes a disc 15 (see FIG. 1) integral with the wheel W, a pair of movable brake pads (not shown) disposed on both sides thereof, and a piston (not shown) for driving the brake pads. ) And a wheel cylinder 16 or the like.
- the brake fluid pressure generated in the master cylinder 12 is transmitted to the wheel cylinder 16 via the fluid pressure circuit 13, whereby the brake pad is driven and the disc 15 is moved.
- the vehicle V is braked by being pinched. Details of the configuration and operation of the braking device 5 will be described later.
- the left and right rear wheels WRL, WRR are provided with electric brakes 20 separately from the braking device 5 described above.
- the electric brake 20 includes a caliper body 21 that is provided integrally with a vehicle body (not shown) of the vehicle V, a nut 22 that is fixed in the caliper body 21, and a forward and backward movement of the nut 22.
- a screw 23 screwed in, a pair of brake pads 24 a and 24 b housed in a recess 21 a of the caliper body 21, and a brake motor 25 having a rotary shaft 25 a connected to one end of the screw 23 are provided.
- One brake pad 24a is attached to the wall surface of the recess 21a, and the other brake pad 24b is attached to the other end of the screw 23.
- the disc 15 of the disc brake 14 is interposed between the brake pads 24a and 24b. Is arranged.
- the master cylinder 12 of the braking device 5 is of a tandem type having two hydraulic chambers and a piston (both not shown). Brake fluid is supplied from the reservoir 31 to each hydraulic pressure chamber, and one piston is connected to the brake pedal 11.
- a brake booster 32 is provided between the brake pedal 11 and the master cylinder 12. The brake booster 32 uses the negative pressure generated in the intake pipe during operation of the engine 3 to generate an assist force that acts on the piston and assists the operation force of the brake pedal 11.
- the two pistons move and pressurize the brake fluid in each hydraulic pressure chamber, thereby generating a brake fluid pressure corresponding to the operation force of the brake pedal 11 assisted by the brake booster 31. Then, it is output from the first output port 33a and the second output port 33b communicating with each hydraulic pressure chamber, respectively.
- the hydraulic circuit 13 of the braking device 5 includes a first hydraulic circuit 13A connected between the first output port 33a and the wheel cylinders 16 and 16 of the left front wheel WFL and the right rear wheel WRR, and a second output port 33b. And a second hydraulic circuit 13B connected between the wheel cylinders 16 and 16 of the right front wheel WFR and the left rear wheel WRL.
- downstream side refers to the master cylinder 12 side
- downstream side refers to the wheel cylinder 16 side when referring to various liquid passages to be described later.
- the first liquid path 41 is connected to the first output port 33a of the master cylinder 12.
- a first control valve 42 and a second control valve 43 for VSA (Vehicle Stability Assist) are provided in parallel on the downstream side of the first liquid passage 41, and the first control valve 42 further includes a check valve 44. Are provided in parallel.
- the first control valve 42 is a normally-open electromagnetic valve that allows bidirectional flow of brake fluid, and its downstream side is connected to a reservoir 46 via a second fluid path 45.
- the check valve 44 is arranged to allow the flow of brake fluid from the upstream side to the downstream side of the first control valve 42.
- the second control valve 43 is a normally closed electromagnetic valve that allows only the flow of the brake fluid from the upstream side, and the downstream side thereof is connected to the second fluid passage 45 via the third fluid passage 47. It is connected.
- the second fluid passage 45 is provided with a check valve 48 that allows the brake fluid to flow from the reservoir 46 side at a position closer to the reservoir 46 than the connection portion of the third fluid passage 47.
- Each fourth liquid passage 49 is provided with an inflow valve 50 and a check valve 51 in parallel.
- the inflow valve 50 is a normally open electromagnetic valve that allows bidirectional flow of brake fluid.
- the check valve 51 is disposed so as to allow the flow of brake fluid from the downstream side to the upstream side of the inflow valve 50.
- the fifth liquid passage 52 is branched from the downstream side of the inflow valve 50 of each fourth liquid passage 49, and the outflow valve 53 is provided in each fifth liquid passage 52.
- the outflow valve 53 is a normally closed electromagnetic valve that allows only the flow of brake fluid from the inflow valve 50 side.
- the fifth liquid passages 52 and 52 merge with the sixth liquid passage 54, and the sixth liquid passage 54 is connected to the reservoir 46 side of the check valve 48 of the second liquid passage 45.
- the second liquid passage 45 is provided with a hydraulic pump 55 at a position on the opposite side of the reservoir 46 from the connecting portion of the third liquid passage 47, and this hydraulic pump 55 is connected to the hydraulic motor 56.
- the hydraulic motor 56 is driven by the electric power supplied from the battery 7 based on the drive signal from the ECU 2, thereby driving the hydraulic pump 55.
- the braking device 5 In the normal driving state of the vehicle V and the engine 3, the braking device 5 is controlled to the normal mode shown in FIG. That is, all the first control valve 41, the second control valve 42, the inflow valve 50, and the outflow valve 53 of the braking device 5 are controlled to be in a non-excited state, and the hydraulic motor 56 and the hydraulic pump 55 are stopped.
- the first control valve 41, the second control valve 42, the inflow valve 50, and the outflow valve 53 of the braking device 5 are controlled to be in a non-excited state, and the hydraulic motor 56 and the hydraulic pump 55 are stopped.
- a brake fluid pressure (master cylinder pressure PMC) that is pressurized according to the sum of the operating force and the assist force by the brake booster 32 is generated in the master cylinder 12.
- the brake fluid pressure is output from the first and second output ports 33a and 33b to the first fluid passages 41 of the first and second fluid pressure circuits 13A and 13B.
- the first control valve 42, the inflow valve 50, and It is supplied to the wheel cylinder 16 of each wheel W through the fourth liquid passage 49.
- the disc brake 14 is actuated at each wheel W, and the vehicle V is braked with a braking force corresponding to the wheel cylinder pressure PWC.
- the first control valve 42 When increasing the braking force of the vehicle V, the first control valve 42 is excited and closed, the second control valve 43 is excited and opened from the control state in the normal mode, and the hydraulic motor 56 is driven.
- the hydraulic pump 55 To actuate the hydraulic pump 55 (pressurization mode).
- the brake fluid In this pressurizing mode, the brake fluid is pumped up from the reservoir 46 by the hydraulic pump 55 and pressurized, and the pressurized brake fluid pressure passes through the second fluid passage 45, the inflow valve 50 and the fourth fluid passage 49.
- the wheel cylinder pressure PWC increases and the braking force of the vehicle V increases.
- the second control valve 43 is de-energized from the control state in the pressurization mode and is closed (holding mode). .
- the first fluid passage 41 communicating with the master cylinder 12 is closed by the first control valve 42 and the return of the brake fluid from the second fluid passage 45 to the reservoir 46 is prevented by the check valve 48.
- the wheel cylinder pressure PWC is maintained, and the braking force of the vehicle V is maintained.
- the holding mode is canceled when the vehicle V starts and returns to the normal mode described above.
- sensors for detecting the operation state of the vehicle V and the engine 3 are provided as follows.
- the first fluid passage 41 is provided with a master cylinder pressure sensor 61 for detecting the master cylinder pressure PMC
- the second fluid passage 45 is provided with a wheel cylinder pressure sensor 62 for detecting the wheel cylinder pressure PWC. These detection signals are output to the ECU 2 (see FIG. 4).
- the ECU 2 receives a CRK signal representing the rotational speed of the crankshaft of the engine 3 from the crank angle sensor 63, and VW representing the rotational speed of each wheel W from the wheel speed sensor 64.
- a signal is input.
- the ECU 2 calculates the engine speed (hereinafter referred to as “engine speed”) NE based on the CRK signal, and calculates a vehicle speed VP that is the speed of the vehicle V based on the VW signal.
- the ECU 2 receives from the accelerator position sensor 65 a detection signal indicating the opening degree of an accelerator pedal (not shown) AP (hereinafter referred to as “accelerator position”) AP from the shift position sensor 66 to the shift position of the shift lever.
- Detection signals representing SP are input from the acceleration sensor 67 as detection signals representing the longitudinal acceleration GFR of the vehicle V, respectively.
- the ECU 2 receives a detection signal representing the voltage of the battery 7 (hereinafter referred to as “battery voltage”) VB from the voltage sensor 68.
- the ECU 2 calculates the remaining charge amount (hereinafter referred to as “remaining battery amount”) SOC of the battery 7 based on the detection signal and the like.
- the ECU 2 receives a detection signal indicating the on / off state of the ignition switch 69 and a detection signal indicating the on / off state of the brake pedal 11 from the brake switch 70.
- the ECU 2 is composed of a microcomputer including a CPU, a RAM, a ROM, an input interface (all not shown), and the like.
- the ECU 2 determines the operating states of the engine 3 and the vehicle V based on the control programs stored in the ROM in accordance with the detection signals of the various sensors 61 to 68 and the switches 69 and 70 described above, and the determination results. Based on the above, various control processes including control of the braking force of the engine 3 and the vehicle V are executed.
- the ECU 2 controls the starter motor 6 and the fuel injection valve 8 to execute the idle stop control of the engine 3.
- the excitation / non-excitation of the first control valve 42, the second control valve 43, the inflow valve 50, and the outflow valve 53 of the control device 5 respectively configured by electromagnetic valves is individually controlled, and the hydraulic motor 56 and The brake force control of the vehicle V is executed by controlling the hydraulic pump 55 and the electric brake 20 via the brake motor 25, respectively.
- the ECU 2 corresponds to a braking force increase necessity determination unit, a control unit, a predetermined time setting unit, and a predetermined pressure setting unit.
- the idle stop control process shown in FIG. 5 controls the idle stop of the engine 3 and the subsequent restart, and is executed every predetermined time.
- step 1 it is determined whether or not a predetermined stop condition of the engine 3 is satisfied.
- This stop condition is composed of the following conditions (a) to (g).
- the ignition switch 69 is on
- the engine speed NE is greater than or equal to a predetermined value
- the vehicle speed VP is less than or equal to a predetermined value
- the accelerator opening AP is substantially zero.
- the shift position SP is other than P, R, or N.
- the brake switch 70 is in an ON state.
- G The remaining battery charge SOC is greater than or equal to a predetermined value.
- step 2 it is determined whether or not the idle stop flag F_IDLSTP is “1”.
- the answer is YES, it is determined whether or not the accelerator opening AP is equal to or greater than a predetermined restart determination opening APST (step 3).
- this answer is NO, the fuel injection from the fuel injection valve 8 is stopped, and the engine 3 is controlled to be stopped to execute the idle stop (step 4).
- step 3 when the answer to step 3 is YES, that is, when the accelerator pedal is depressed during the idling stop and the accelerator opening AP is equal to or greater than the restart determination opening APST, the restart condition of the engine 3 is satisfied. As a result, the idle stop flag F_IDLSTP is reset to “0” (step 5), and the restart flag F_RESTART is set to “1” (step 6).
- step 7 it is determined whether or not the hydraulic pump operation flag F_BR is “1” (step 7).
- the hydraulic pump operation flag F_BR is set to “1” when the hydraulic pump 55 is operating in order to increase the braking force of the vehicle V in the braking force control process of FIG. is there. If the answer to step 7 is YES and the hydraulic pump 55 is operating, the cranking flag F_CRK is set to “0” (step 8) and the cranking is prohibited (step 9), and this process is terminated. To do. Thus, cranking is prohibited when the restart condition is satisfied during the operation of the hydraulic pump 55.
- step 7 if the answer to step 7 is NO and the hydraulic pump 55 is not operating, the cranking flag F_CRK is set to “1” (step 10), and cranking is executed (step 11). Exit.
- step 2 After the restart condition is satisfied as described above, the answer to step 2 is NO. In this case, the process proceeds to step 12 to determine whether or not the restart flag F_RESTART is “1”. After the restart condition is established, the answer to step 12 is YES. In this case, it is determined whether or not the cranking flag F_CRK is “1” (step 13).
- step 13 If the cranking is not originally prohibited, or after the cranking prohibited state is canceled as described above, the answer to step 13 becomes YES. In this case, the process proceeds to step 14 and the engine speed is increased. It is determined whether NE is equal to or higher than a predetermined idle speed NEIDL. If the answer is NO and NE ⁇ NEIDL, the process proceeds to step 11 and the cranking is continued.
- step 14 if the answer to step 14 is YES and the engine speed NE rises above the idle speed NEIDL due to cranking, the restart flag F_RESTART is reset to “0”, assuming that the restart is completed (step 15). ) And the cranking is finished (step 16), and this process is finished. After restarting is completed in this way, the answer to step 12 is NO, and the process is terminated.
- This process determines whether or not it is necessary to increase the braking force by operating the hydraulic pump 55 or the like in order to compensate for the lack of braking force by the braking device 5 during idling stop or restart of the engine 3. It is executed every predetermined time.
- step 21 it is determined whether or not the idle stop flag F_IDLSTP or the restart flag F_RESTART is “1”. If the answer is NO and neither idle stop nor restart is in progress, the present process is terminated.
- step 22 the slope ASLP of the road surface on which the vehicle V is stopped is calculated (step 22).
- the calculation of the road surface gradient ASLP is performed based on the longitudinal acceleration GFR detected by the acceleration sensor 67.
- the predetermined pressure PREF is calculated by searching the map shown in FIG. 7 according to the calculated road surface gradient ASLP (step 23).
- the predetermined pressure PREF is set to the minimum value when the road surface gradient ASLP is 0 and the road surface is flat, and is set to a larger value as the gradient is larger in both cases of the upward gradient and the downward gradient. Has been.
- step 24 it is determined whether or not the detected wheel cylinder pressure PWC is larger than the set predetermined pressure PREF (step 24).
- this answer is NO and PWC ⁇ PREF, it is determined that the braking force of the vehicle V needs to be increased because the wheel cylinder pressure PWC is insufficient.
- the braking force increase request flag F_BFREQ is set to “1” (step 25), and this process ends.
- step 26 it is determined whether or not the vehicle speed VP is substantially 0 (step 26).
- this answer is NO, it is determined that the braking force of the vehicle V needs to be increased in order to prevent further movement of the vehicle V because the vehicle V is actually moving even slightly. Proceeding to step 25, the braking force increase request flag F_BFREQ is set to "1".
- step 26 if the answer to step 26 is YES, the wheel cylinder pressure PWC> the predetermined pressure PREF is satisfied, and the vehicle speed VP is substantially 0, it is determined that the braking force of the vehicle V does not need to be increased, and the braking force increases.
- the request flag F_BFREQ is set to “0” (step 27)
- This process controls the braking force of the vehicle V according to the determination result of whether or not the braking force needs to be increased obtained by the process of FIG. 6 during idling stop and restart of the engine 3. This is executed every predetermined time.
- step 31 it is determined whether or not the idle stop flag F_IDLSTP is “1”. If the answer is YES, and the vehicle is idling, to maintain the braking force of the vehicle V.
- the braking device 5 is controlled to the holding mode described above (step 33), and this process is terminated.
- step 34 determines whether or not a braking force increase request flag F_BFREQ is “1”. If the answer is NO and it is determined that there is no need to increase the braking force of the vehicle V, the present process is terminated as it is.
- step 34 determines whether or not the hydraulic pump operation flag F_BR is “1” (step 35). . If the answer is NO and the hydraulic pump 55 is not operating yet, the hydraulic pump operating flag F_BR is set to “1” (step 36), and the pump operating time TMBR counted by the up-count timer is set. After resetting to 0 (step 37), the hydraulic motor 56 is driven to start the operation of the hydraulic pump 55 (step 38), and this process is terminated.
- the brake hydraulic pressure pressurized by the hydraulic pump 55 is changed to the hydraulic circuit 13.
- the brake fluid pressure in the wheel cylinder 16 is increased, and the braking force of the vehicle V is increased.
- step 39 it is determined whether or not the pump operating time TMBR is equal to or longer than a predetermined time TBRREF (step 39).
- the process proceeds to the step 38, and the operation of the hydraulic pump 55 is continued.
- the hydraulic pump 55 is stopped (step 40), and this process is terminated.
- FIG. 9 shows an operation example obtained by the processing described so far in the case where the restart condition is satisfied while the hydraulic pump 55 is operating.
- the braking force increase request flag F_BFREQ is set to “1” accordingly (step 25 in FIG. 6).
- the operation of the hydraulic pump 55 is started (steps 34 and 38 in FIG. 8).
- cranking is performed when the restart condition of the engine 3 from the idle stop state is satisfied during the operation of the hydraulic pump 55 for increasing the braking force of the vehicle V.
- the hydraulic pump 55 is continuously operated. This prevents the battery voltage VB from decreasing due to cranking, and ensures a stable operation of the hydraulic pump 55, so that the braking force of the vehicle V can be reliably increased. The movement of V can be reliably prevented.
- cranking can be started as quickly as possible, and restart can be performed without any trouble.
- the operation time is sufficiently secured, so that the braking force of the vehicle V can be more reliably ensured. Can be increased.
- the predetermined time TBRREF is a fixed value, but the predetermined time TBRREF may be set according to the calculated road gradient ASLP.
- the predetermined time TBRREF is set to a minimum value when the road surface gradient ASLP is 0 and the road surface is flat, for example, as in the case of the predetermined pressure PREF shown in FIG. Set to As a result, the braking force of the vehicle V can be increased more appropriately by operating the hydraulic pump 55 longer as the vehicle V moves more easily due to the influence of the road surface gradient.
- the hydraulic pump 55 is operated only when it is determined that the braking force of the vehicle V needs to be increased. Therefore, unlike the conventional apparatus, the operation of the hydraulic pump 55 wastes power. Therefore, it is possible to efficiently perform the operation, and the fuel consumption of the vehicle V can be improved.
- the hydraulic pump 55 can be appropriately operated according to the actual state of decrease in the wheel cylinder pressure PWC and the movement state of the vehicle V, and the necessary braking force can be effectively obtained. Furthermore, since the predetermined pressure PREF is set according to the road surface gradient ASLP, the hydraulic pump 55 can be appropriately operated according to the ease of movement of the vehicle V.
- step 39 ⁇ / b> A corresponding to step 39 in FIG. 8 is changed, and the pump of the embodiment is used as a reference for determining the stop timing of the hydraulic pump 55.
- the wheel cylinder pressure PWC is used instead of the operation time TMBR.
- the hydraulic pump 55 after the hydraulic pump 55 is operated, the hydraulic pump 55 can be stopped in a state where the wheel cylinder pressure PWC is actually sufficiently recovered. The power can be reliably increased and the hydraulic pump 55 can be operated efficiently.
- the present invention is not limited to the above-described embodiment, and can be implemented in various modes.
- the hydraulic pump 55 is used as a braking force increasing device that increases the braking force of the vehicle V, but the electric brake 20 may be used instead.
- the effects described above can be obtained in the same manner by controlling the operation and stop of the electric brake 20 in the same manner as in the case of the hydraulic pump 55 described above.
- the disc brake 14 is provided on each wheel W of the vehicle V.
- a drum brake may be used instead of the disc brake.
- the electric brake a drum brake can be used.
- the embodiment is an example in which the present invention is applied to a vehicle equipped with a gasoline engine.
- the present invention is not limited to this, and the present invention is also applied to a vehicle equipped with various engines such as a diesel engine other than a gasoline engine. Is possible.
- the present invention is extremely useful in a vehicle stop control device for reliably increasing the braking force of a vehicle during an idle stop and reliably preventing the vehicle from moving while the vehicle is stopped.
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- Engineering & Computer Science (AREA)
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- Environmental & Geological Engineering (AREA)
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- Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
- Control Of Driving Devices And Active Controlling Of Vehicle (AREA)
Abstract
Description
(a)イグニッションスイッチ69がオン状態であること
(b)エンジン回転数NEが所定値以上であること
(c)車速VPが所定値以下であること
(d)アクセル開度APがほぼ0であること
(e)シフトポジションSPがP、R、N以外であること
(f)ブレーキスイッチ70がオン状態であること
(g)バッテリ残量SOCが所定値以上であること
所定圧力設定手段)
3 内燃機関
5 制動装置
6 スタータモータ(クランキング手段)
7 バッテリ(電源)
16 ホイールシリンダ
20 電動ブレーキ(制動力増加装置)
55 液圧ポンプ(制動力増加装置)
62 ホイールシリンダ圧センサ(ホイールシリンダ圧検出手段)
64 車輪速センサ(車速検出手段)
67 加速度センサ(路面勾配検出手段)
V 車両
TBRREF 所定時間
PWC ホイールシリンダ圧(ホイールシリンダ内のブレーキ液圧)
PREF 所定圧力
ASLP 路面勾配(車両が停車している路面の勾配)
VP 車速(車両の速度)
Claims (8)
- 制動装置を有する車両に搭載された内燃機関を、所定の停止条件が成立したときに停止させ、所定の再始動条件が成立したときに再始動させるとともに、前記車両の停車中、前記制動装置の制動力を補うために前記車両の制動力を増加させるように制御する車両の停止制御装置であって、
前記再始動条件が成立したときに、所定の電源から供給される電力を用いて前記内燃機関をクランキングするクランキング手段と、
前記電源から供給される電力によって駆動され、前記車両の制動力を増加させるための制動力増加装置と、
前記車両の停車中、前記制動力増加装置による前記車両の制動力の増加が必要であるか否かを判定する制動力増加要否判定手段と、
前記車両の制動力の増加が必要であると判定されたときに、前記制動力増加装置を作動させる制御手段と、を備え、
当該制御手段は、前記制動力増加装置の作動中に前記再始動条件が成立したときに、前記クランキングを禁止することを特徴とする車両の停止制御装置。 - 前記制御手段は、前記制動力増加装置の作動が終了するまで、前記クランキングを禁止し、前記制動力増加装置の作動が終了したときに、前記クランキングを開始させることを特徴とする、請求項1に記載の車両の停止制御装置。
- 前記制御手段は、前記制動力増加装置の作動を開始した後、所定時間が経過したときに、当該制動力増加装置を停止させることを特徴とする、請求項1又は2に記載の車両の停止制御装置。
- 前記車両が停車している路面の勾配を検出する路面勾配検出手段と、
当該検出された路面の勾配に応じて前記所定時間を設定する所定時間設定手段と、をさらに備えることを特徴とする、請求項3に記載の車両の停止制御装置。 - 前記制動装置は、ホイールシリンダに供給されるブレーキ液圧によって前記車両を制動するように構成されており、
前記ホイールシリンダ内のブレーキ液圧を検出するホイールシリンダ圧検出手段をさらに備え、
前記制動力増加要否判定手段は、前記検出されたホイールシリンダ内のブレーキ液圧が所定圧力以下に低下したときに、前記制動力増加装置による制動力の増加が必要であると判定することを特徴とする、請求項1ないし4のいずれかに記載の車両の停止制御装置。 - 前記制御手段は、前記制動力増加装置を作動させた後、前記ホイールシリンダのブレーキ液圧が前記所定圧力を上回ったときに、前記制動力増加装置を停止させることを特徴とする、請求項5に記載の車両の停止制御装置。
- 前記車両が停車している路面の勾配を検出する路面勾配検出手段と、
前記検出された路面の勾配に応じて前記所定圧力を設定する所定圧力設定手段と、をさらに備えることを特徴とする、請求項5又は6に記載の車両の停止制御装置。 - 前記車両の速度を検出する車速検出手段をさらに備え、
前記制動力増加要否判定手段は、前記検出された車両の速度が0でないときに、前記制動力増加装置による制動力の増加が必要であると判定することを特徴とする、請求項1ないし4のいずれかに記載の車両の停止制御装置。
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201280076792.XA CN104755747B (zh) | 2012-11-13 | 2012-11-13 | 车辆的停止控制装置 |
| JP2014546753A JP6018642B2 (ja) | 2012-11-13 | 2012-11-13 | 車両の停止制御装置 |
| US14/441,854 US9463781B2 (en) | 2012-11-13 | 2012-11-13 | Stop control system for vehicle |
| PCT/JP2012/079359 WO2014076754A1 (ja) | 2012-11-13 | 2012-11-13 | 車両の停止制御装置 |
| DE112012007125.5T DE112012007125B4 (de) | 2012-11-13 | 2012-11-13 | Stoppsteuersystem für Fahrzeug |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2012/079359 WO2014076754A1 (ja) | 2012-11-13 | 2012-11-13 | 車両の停止制御装置 |
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| WO2014076754A1 true WO2014076754A1 (ja) | 2014-05-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| PCT/JP2012/079359 Ceased WO2014076754A1 (ja) | 2012-11-13 | 2012-11-13 | 車両の停止制御装置 |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US9463781B2 (ja) |
| JP (1) | JP6018642B2 (ja) |
| CN (1) | CN104755747B (ja) |
| DE (1) | DE112012007125B4 (ja) |
| WO (1) | WO2014076754A1 (ja) |
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| CN108138665B (zh) * | 2015-10-30 | 2019-04-05 | 日产自动车株式会社 | 车辆用信息提供方法以及车辆用信息提供装置 |
| JP6735931B2 (ja) * | 2017-10-13 | 2020-08-05 | 日立オートモティブシステムズ株式会社 | 電動ブレーキ装置 |
| US12227157B2 (en) * | 2021-10-01 | 2025-02-18 | Ford Global Technologies, Llc | Methods and apparatus to extend brake life cycle |
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Also Published As
| Publication number | Publication date |
|---|---|
| JPWO2014076754A1 (ja) | 2016-09-08 |
| JP6018642B2 (ja) | 2016-11-02 |
| CN104755747B (zh) | 2017-06-23 |
| US9463781B2 (en) | 2016-10-11 |
| DE112012007125B4 (de) | 2023-08-24 |
| DE112012007125T5 (de) | 2015-07-23 |
| US20150298665A1 (en) | 2015-10-22 |
| CN104755747A (zh) | 2015-07-01 |
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