JP2005023837A - Idling stop control device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an idling stop control device for a vehicle capable of preventing the vehicle from starting to move after a driver leaves the vehicle by quickly making the driver recognize a condition where braking force by a parking brake is less than the creep force by engine restart when he/she opens the door. <P>SOLUTION: In an idling stop control device for an vehicle provided with an idling stop control means automatically stopping an engine 1 when a brake is operated under a condition of vehicle stop and automatically restarting the engine 1 when the brake operation is released, a hill hold control means keeping vehicle standstill for a predetermined period of time after brake operation release when brake operation is released under a condition of automatic stop of the engine 1, a door switch 41 detecting open close state of at least a driver seat side door, and a hill hold releasing step S12 releasing vehicle standstill by the hill hold control means when door open is detected before restart of the engine 1 are provided. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
In the present invention, when the brake operation is released while the engine is automatically stopped, the engine is automatically restarted in preparation for starting, and at the same time, the vehicle is kept stationary even on a slope by hill hold control up to a predetermined time. It belongs to the technical field of idle stop control devices for vehicles.
[0002]
[Prior art]
A conventional idle stop control device for a vehicle automatically stops the engine when a brake operation is performed while the vehicle is stopped, and restarts the engine automatically when the brake operation is released (see, for example, Patent Document 1). ).
In addition, there is known one that puts the vehicle in a stationary state (hill hold state) by controlling the hill hold brake engagement pressure regardless of the road gradient when starting the engine (see, for example, Patent Document 2).
[0003]
[Patent Document 1]
JP 2000-234538 A
[Patent Document 2]
Japanese Patent Application Laid-Open No. 11-94070.
[0004]
[Problems to be solved by the invention]
However, in the conventional idle stop control device for a vehicle, the engine is automatically restarted when the parking brake is operated, the foot brake is released by releasing the parking brake, the door is opened and the passenger gets off. Since the creep force is generated by the parking brake, the creep force is less than the creep force.If the driver opens the door before the hill hold is released, the driver leaves the vehicle. If the hill hold is released from, and the parking brake braking force falls below the creep force due to the release of the hill hold, the vehicle may start to move.
[0005]
The present invention has been made paying attention to the above-mentioned problem, and when the door is opened, the driver quickly recognizes the state in which the braking force by the parking brake is lower than the creep force by the engine restart. It is an object of the present invention to provide an idle stop control device for a vehicle that can prevent the vehicle from moving after being separated.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, in the present invention,
An idle stop control means for automatically stopping the engine when the brake is operated while the vehicle is stopped, and automatically restarting the engine when the brake is released;
In an idle stop control device for a vehicle equipped with
A hill hold control means for maintaining the vehicle stationary until a predetermined time after the release of the brake operation when the brake operation is released in the automatic stop state of the engine,
Door opening / closing detection means for detecting at least the opening / closing state of the door on the driver's seat side;
A hill hold release means for releasing the maintenance of the vehicle stationary by the hill hold control means when door opening is detected after the engine is restarted;
Was provided.
[0007]
【The invention's effect】
Therefore, in the idle stop control device for a vehicle according to the present invention, when the hill hold canceling means detects that the driver side door is opened after the engine is restarted, the hill hold control means cancels the maintenance of the vehicle stationary. Therefore, it is possible to prevent the driver from moving after the driver leaves the vehicle by promptly recognizing when the door is opened that the braking force by the parking brake is less than the creep force by restarting the engine. Can do.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments for realizing an idle stop control device for a vehicle according to the present invention will be described below based on first to fourth embodiments shown in the drawings.
[0009]
(First embodiment)
First, the configuration will be described.
FIG. 1 is an overall system diagram showing an idle stop control device for a vehicle according to a first embodiment. The first embodiment is an example in which it is assumed that the driver gets off by operating the parking brake after the engine is restarted.
[0010]
The vehicle drive system to which the first embodiment apparatus is applied includes an engine 1, a continuously variable transmission 2, and a motor generator 3, as shown in FIG.
[0011]
The continuously variable transmission 2 includes an engine output shaft 4, a torque converter 5, a turbine rotating shaft 6, a forward clutch 7 (starting clutch), a transmission input shaft 8, a primary pulley 9, a V belt 10, a secondary pulley 11, and a transmission. An output shaft 12 and an external additional oil pump 13 are provided.
[0012]
When the engine 1 is automatically stopped by idle stop control, the forward clutch 7 is disengaged by releasing the clutch. When the engine 1 is automatically restarted, the forward clutch 7 is controlled to be gradually engaged as the engine speed increases. Done.
[0013]
The external additional oil pump 13 is a pump that can supply hydraulic pressure even when the engine 1 is stopped by idle stop control. The transmission output shaft 12 is connected to drive wheels via a differential (not shown).
[0014]
The motor generator 3 has an engine start motor function for supplying electric power from the battery 14 via the inverter 15 when the engine is started, and a battery charging function for charging the battery 14 via the inverter 15 with electric power generated during braking or deceleration. Is a three-phase AC motor. The engine 1 and the motor generator 3 are connected to each other via a crank pulley 16 and a motor pulley 17 and a belt 18.
[0015]
As shown in FIG. 1, the vehicle braking system to which the first embodiment device is applied includes a brake pedal 19, a brake booster 20, a master cylinder 21, master cylinder hydraulic pipes 22, 23, and ABS brake hydraulic pressure. An actuator 24, wheel cylinder hydraulic pipes 25, 26, 27, and 28, and wheel cylinders 29, 30, 31, and 32 are provided.
[0016]
The ABS brake fluid pressure actuator 24 has an ABS function for controlling the brake fluid pressure in three modes of pressure reduction, maintenance, and pressure increase so as to prevent braking lock during low-μ road braking or sudden braking. In addition, at the time of idling stop that automatically stops the engine 1, the brake fluid pressure enclosed in each wheel cylinder 29, 30, 31, 32 by the brake operation is applied for a predetermined time after the engine restart by releasing the brake operation ( For example, it has a hill hold function (hill hold control means) that remains until the engine speed reaches the idle speed 0.3 seconds later.
[0017]
As shown in FIG. 1, the control system of the vehicle to which the first embodiment apparatus is applied includes a general control unit 33, an engine control module 34, a CVT control module 35, a brake control module 36, a battery controller 37, a motor controller 38, It has.
[0018]
The integrated control unit 33 includes a brake stroke sensor 39 (brake operation state detecting means), an inclination sensor 40, a door switch 41 (door open / close detecting means), an engine hood switch 42, an engine water temperature sensor 43, a CVT oil pressure sensor 44, and a CVT. Information from the oil temperature sensor 45 or the like is input.
[0019]
The engine control module 34 is connected to the general control unit 33 through a bidirectional communication line 46, and automatically stops the engine 1 based on an engine stop request from the general control unit 33. Based on the engine start request from 33, the engine 1 is automatically restarted.
[0020]
Information from an accelerator opening sensor 47, a vehicle speed sensor 48 (vehicle stop state detection means), an inhibitor switch 49, and the like are input to the CVT control module 35. The forward clutch 7 is connected to the general control unit 33 by a bidirectional communication line 50, and based on the fastening hydraulic pressure lowering command, the hydraulic pressure startup command, and the hydraulic pressure startup early command from the general control unit 33. The fastening pressure of is controlled.
[0021]
Information from the brake booster negative pressure sensor 51 or the like is input to the brake control module 36. And, with the general control unit 33, the wheel cylinder hydraulic pressure is controlled by the bidirectional communication line 52 based on the hill hold operation command, the hill hold release command, and the hill hold prohibition command.
[0022]
The battery controller 37 detects battery capacity (SOC) and outputs battery capacity information to the general control unit 33.
[0023]
The motor controller 38 controls the inverter 15 to start the motor generator 3 when there is a motor start request from the general control unit 33.
[0024]
Next, the operation will be described.
[0025]
[Idle stop control processing]
FIG. 2 is a flowchart showing the flow of the idle stop control process executed by the integrated control unit 33 of the first embodiment apparatus. Hereinafter, each step will be described (idle stop control means).
[0026]
In step S1, it is determined whether or not an idle stop is being performed. If YES, the process proceeds to step S5, and if NO, the process proceeds to step S2.
[0027]
In step S2, it is determined whether or not there is an engine stop request based on the determination in step S1 that a non-idle stop is in progress. If YES, the process proceeds to step S3, and if NO, the process proceeds to return.
Here, the “engine stop request” is, for example, during engine operation with the D hood, vehicle speed 0, brake ON, driver's door closed, and engine hood closed.
・ Battery SOC
・ Brake booster negative pressure
・ Engine water temperature
・ CVT oil temperature
・ CVT hydraulic pressure
Is issued when it is detected that the threshold value is exceeded.
[0028]
In step S3, it is determined whether or not the driver's seat door is closed based on the determination that there is an engine stop request in step S2. If YES, the process proceeds to step S4, and if NO, the process proceeds to return.
[0029]
In step S4, the engine 1 is automatically stopped based on the determination that the driver's seat door is closed in step S3, and the process proceeds to return.
[0030]
In step S5, it is determined whether or not there is a motor activation request based on the determination that the idle stop is being performed in step S1. If YES, the process proceeds to step S6, and if NO, the process proceeds to return.
Here, the “motor start request” is, for example, during D range, vehicle speed 0, brake ON, idle stop,
(Request from driver)
・ Acceleration ON
・ Brake off (below the stroke or hydraulic pressure threshold)
・ Switching shift position to R range
・ Driver seat door open
・ Open engine hood
(Request from system)
・ Low battery SOC
・ Brake booster negative pressure drop
・ Engine water temperature drop
・ CVT oil temperature drop
Issued when an error is detected.
[0031]
In step S6, the engine 1 is started based on the determination that there is a motor activation request in step S5, and the process proceeds to step S7.
[0032]
In step S7, it is determined whether or not the brake is OFF. If YES, the process proceeds to step S8, and if NO, the process proceeds to step S2.
[0033]
In step S8, on the basis of the brake OFF determination in step S7, a hill hold operation that keeps the wheel cylinder hydraulic pressure supplied by the brake ON operation kept is started, and the process proceeds to step S9.
[0034]
In step S9, it is determined whether or not the driver's seat door is open. If YES, the process proceeds to step S12, and if NO, the process proceeds to step S10.
[0035]
In step S10, it is determined whether or not the hill hold release condition is satisfied based on the determination that the driver's seat door is closed in step S9. If YES, the process proceeds to step S12. If NO, the process proceeds to step S11. Transition.
Here, the “hill hold cancellation condition” is, for example, 0.3 seconds after the engine speed reaches the idling speed.
[0036]
In step S11, based on the determination that the hill hold release condition is not satisfied in step S10, it is determined whether or not the hill hold time has passed the set fixed time. If YES, the process proceeds to step S12. If NO, the process returns to step S8.
[0037]
In step S12, the hill hold is canceled when any one of the driver's seat door opening in step S9, the hill hold cancellation condition establishment in step S10 is satisfied, and the hill hold duration elapse in step S11 is satisfied. The process proceeds to S2.
[0038]
[Idle stop control action]
When the engine is stopped due to a signal or the like and an engine stop request is issued, the flow proceeds to step S1, step S2, step S3, step S4 in the flowchart of FIG. 2, and the engine stop request and the driver's seat door are closed. As a result, the engine 1 is automatically stopped in step S4.
[0039]
During the idle stop, while the motor start request condition is not satisfied, the flow of steps S1 to S5 is repeated in the flowchart of FIG.
[0040]
Thereafter, the motor start request condition is satisfied during idling stop, but if the brake pedal 19 is kept depressed, in the flowchart of FIG. 2, go to step S1, step S5, step S6, step S7, and step S2. The flow of advancing is repeated, and in step S6, the engine 1 is automatically started. In this case, since the brake pedal 19 remains depressed, even if a creep force is generated by starting the engine 1, the braking force by the brake operation exceeds the creep force, and the vehicle is kept stationary.
[0041]
Further, when the release operation of the brake pedal 19 is performed after the engine 1 is restarted, in the flowchart of FIG. 2, the flow proceeds from step S 1 → step S 5 → step S 6 → step S 7 → step S 8. Hill hold control that keeps the wheel cylinder hydraulic pressure is started. At this time, if the driver's seat door remains closed, the flow proceeds from step S8 to step S9 → step S10 (or step S11) → step S12, when the engine speed exceeds the idling speed, or The hill hold control is released when a preset time (set based on the time required from the release of the brake operation to the start) has elapsed.
[0042]
However, after the engine 1 is restarted, if the driver operates the parking brake and releases the brake pedal 19 to open the driver's door to get off the vehicle, step S1 → step in the flowchart of FIG. The flow proceeds from S5 → step S6 → step S7 → step S8 → step S9 → step S12. In step S8, the started hill hold control is canceled simultaneously with the detection of opening of the driver's seat door. In this case, since only the braking force by the parking brake is used, the creep force generated by starting the engine 1 exceeds the braking force by the parking brake, and the vehicle starts to move slightly, so that the braking force by the parking brake keeps the vehicle stationary. This can be noticed before the driver leaves the vehicle.
[0043]
[When driver gets off after engine restart]
For example, in a scene where the driver opens the door with the parking brake released and the brake operation is released after the engine restarts, the sum of the braking force of the parking brake and the braking force by the hill hold slightly exceeds the creep force. Consider the situation.
[0044]
While the hill hold is in operation, the braking force that stops the vehicle exceeds the creep force generated when the engine 1 is started. Therefore, the vehicle does not start to move.
[0045]
On the other hand, the hill hold operation is intended to prevent the vehicle from retreating from the time when the braking operation is released until the engine 1 is started and the creep force is generated when the hill starts. The timing is after the time when the creep force rises, and considering the ease of driving when starting on a slope (being able to start easily without lowering back), it can be assumed that the timing is slightly delayed from the time when the creep force rises.
[0046]
In that case, a time lag of approximately 0.4 to 0.7 seconds will occur between the release of the brake operation and the release of the hill hold, and when the driver gets off by quickly opening the door during that time, Since the hill hold is released, the creep force exceeds the braking force of the parking brake, and the vehicle may start to move.
[0047]
In the case of the first embodiment device, in a scene where the driver opens the door after the engine restarts and releases the brake operation after the engine is restarted, the hill hold is released immediately upon detecting the door opening, By causing the driver to quickly recognize that the braking force of the brake is below the creep force, it is possible to prevent the vehicle from moving after the driver leaves the vehicle.
[0048]
That is, the driver recognizes that the braking force of the parking brake is lower than the creep force by starting the movement of the vehicle. For example, when the shift position is switched from the D range position to the P range position, the driver then leaves the vehicle. Can also keep the vehicle stationary.
[0049]
Next, the effect will be described.
In the idle stop control device for a vehicle according to the first embodiment, the following effects can be obtained.
[0050]
(1) A vehicle speed sensor 48 for detecting the stop state of the vehicle, a brake stroke sensor 39 for detecting the brake operation state, and the engine 1 is automatically stopped when the brake operation is performed while the vehicle is stopped, and the engine when the brake operation is released. In an idle stop control device for a vehicle having an idle stop control means for automatically restarting 1, when the brake operation is released in the automatic stop state of the engine 1, the vehicle is stopped until a predetermined time after the brake operation is released. The hill hold control means for maintaining the door, the door switch 41 for detecting at least the opening / closing state of the door on the driver's seat side, and when the door opening is detected after the engine 1 is restarted, the hill hold control means Since the hill hold release step S12 for releasing the maintenance is provided, When the driver gets off the parking brake, the driver will quickly recognize when the door is open that the braking force of the parking brake is below the creep force of the engine restart. It is possible to prevent the vehicle from moving.
[0051]
(Second embodiment)
The second embodiment is an example in which it is assumed that the driver gets off by operating the parking brake during idle stop. The configuration of the second embodiment apparatus is the same as that of the first embodiment apparatus shown in the overall system diagram of FIG.
[0052]
Next, the operation will be described.
[0053]
[Idle stop control processing]
FIG. 3 is a flowchart showing the flow of the idle stop control process executed by the integrated control unit 33 of the second embodiment apparatus. Hereinafter, each step will be described (idle stop control means).
[0054]
In step S201, it is determined whether or not an idle stop is being performed. If YES, the process proceeds to step S205, and if NO, the process proceeds to step S202.
[0055]
In step S202, it is determined whether or not there is an engine stop request based on the determination that the non-idle stop is being performed in step S201. If YES, the process proceeds to step S203, and if NO, the process proceeds to return. The engine stop request is the same as that described in step S2 of FIG.
[0056]
In step S203, it is determined whether or not the driver's seat door is closed based on the determination that there is an engine stop request in step S202. If YES, the process proceeds to step S204, and if NO, the process proceeds to return.
[0057]
In step S204, the engine 1 is automatically stopped based on the determination that the driver's seat door is closed in step S203, and the process proceeds to return.
[0058]
In step S205, it is determined whether or not there is a motor activation request based on the determination that the idle stop is being performed in step S201. If YES, the process proceeds to step S209, and if NO, the process proceeds to return. The motor start request is the same as that described in step S5 in FIG.
[0059]
In step S209, it is determined whether the driver's seat door is open. If YES, the process proceeds to step S213, and if NO, the process proceeds to step S206.
[0060]
In step S206, the engine 1 is started based on the determination that the driver's seat door is closed in step S209, and the process proceeds to step S207.
[0061]
In step S207, it is determined whether or not the brake is OFF. If YES, the process proceeds to step S208, and if NO, the process proceeds to step S202.
[0062]
In step S208, based on the brake OFF determination in step S207, a hill hold operation is started in which the wheel cylinder hydraulic pressure supplied by the brake ON operation is kept sealed, and the process proceeds to step S210.
[0063]
In step S210, it is determined whether or not the hill hold cancellation condition is satisfied. If YES, the process proceeds to step S212. If NO, the process proceeds to step S211. The hill hold cancellation condition is the same as that described in step S10 of FIG.
[0064]
In step S211, based on the determination that the hill hold release condition is not satisfied in step S210, it is determined whether or not the hill hold time has passed the set fixed time. If YES, the process proceeds to step S212. If no, the process returns to step S208.
[0065]
In step S212, if any one of the conditions for canceling the hill hold cancellation in step S210 and the elapse of the hill hold duration time in step S211 is satisfied, the hill hold is canceled, and the process proceeds to step S202.
[0066]
In step S213, the operation of the hill hold is prohibited based on the determination that the driver's seat door is opened in step S209, and the process proceeds to step S214.
[0067]
In step S214, the engine 1 is started while prohibiting the operation of the hill hold in step S213, and the process proceeds to step S202.
[0068]
[Idle stop control action]
When the engine is stopped due to a signal or the like and an engine stop request is issued, the flow proceeds to step S201 → step S202 → step S203 → step S204 in the flowchart of FIG. 3, and the engine stop request and the driver's seat door are closed. As a result, the engine 1 is automatically stopped in step S204.
[0069]
During the idle stop, while the motor start request condition is not satisfied, the flow of steps S201 to S205 is repeated in the flowchart of FIG.
[0070]
After that, when the motor start request condition and the driver's seat door closing condition are satisfied during idle stop, the flow proceeds to step S201 → step S205 → step S209 → step S206 in the flowchart of FIG. It is started. If the brake pedal 19 is kept depressed, the flow from step S206 to step S207 → step S202 is repeated. In this case, even if the creep force is generated by starting the engine 1, the braking force by the brake operation exceeds the creep force, and the vehicle is kept stationary.
[0071]
Further, when the release operation of the brake pedal 19 is performed after the engine 1 is restarted, the flow proceeds to step S201 → step S205 → step S209 → step S206 → step S207 → step S208 in the flowchart of FIG. In S208, the hill hold control that keeps the wheel cylinder hydraulic pressure is started, and then the flow proceeds from step S208 to step S210 (or step S211) → step S212, and the engine speed exceeds the idling speed. The hill hold control is canceled at a point in time or when a preset time has elapsed.
[0072]
However, if the driver is idling stop and before the engine 1 is restarted, the driver operates the parking brake, releases the brake pedal 19 to open the door of the driver's seat, and gets off the vehicle. 3, the flow proceeds from step S201 to step S205 to step S209 to step S213 to step S214. In step S213, the operation of the hill hold that is executed for a predetermined time after the engine restart is prohibited. In step S214, The engine 1 is started. That is, when the driver's seat door is opened, the hill hold operation is prohibited and the creep force generated by starting the engine 1 exceeds the braking force of the parking brake. It can be noticed before the driver leaves the vehicle that the braking force is insufficient to keep the vehicle stationary.
[0073]
[When the driver gets off during idle stop]
For example, in a scene where the driver opens the door and releases the vehicle quickly when the parking brake is released and the brake operation is released before the engine restarts, the sum of the braking force of the parking brake and the braking force of the hill hold creeps. Consider a situation where the force is slightly higher.
[0074]
While the hill hold is in operation, the braking force that stops the vehicle exceeds the creep force generated when the engine 1 is started. Therefore, the vehicle does not start to move.
[0075]
On the other hand, the hill hold operation is intended to prevent the vehicle from retreating from the time when the braking operation is released until the engine 1 is started and the creep force is generated when the hill starts.
[0076]
In that case, when the driver opens the door with the parking brake released and the brake operation is released during idle stop, the engine 1 restarts, but at the same time, the hill hold operation is started and the hill hold operation is constant. Since it is released after the time has elapsed, the creeping force exceeds the braking force of the parking brake after the driver gets off, and the vehicle may start to move.
[0077]
In the case of the device of the second embodiment, in the scene where the driver opens the door with the parking brake released and the brake operation is released during the idling stop, the hill hold is prohibited when the door opening is detected, and the engine 1 Therefore, the vehicle can be prevented from moving after the driver leaves the vehicle by promptly recognizing that the braking force of the parking brake is lower than the creep force.
[0078]
That is, the driver recognizes that the braking force of the parking brake is lower than the creep force by starting the movement of the vehicle. For example, when the shift position is switched from the D range position to the P range position, the driver then leaves the vehicle. Can also keep the vehicle stationary.
[0079]
Next, the effect will be described.
In the idle stop control device for a vehicle according to the second embodiment, the following effects can be obtained.
[0080]
(2) A vehicle speed sensor 48 for detecting the stop state of the vehicle, a brake stroke sensor 39 for detecting the brake operation state, the engine 1 is automatically stopped when the brake operation is performed while the vehicle is stopped, and the engine is released when the brake operation is released. In an idle stop control device for a vehicle having an idle stop control means for automatically restarting 1, when the brake operation is released in the automatic stop state of the engine 1, the vehicle is stopped until a predetermined time after the brake operation is released. The hill hold control means for maintaining the door, the door switch 41 for detecting at least the opening / closing state of the door on the driver's seat side, and when the door opening is detected during the automatic stop of the engine 1, the engine 1 is automatically restarted immediately. Engine restart control step S214 for starting, and door opening is detected during the automatic stop of the engine 1. In this case, there is provided a hill hold prohibiting step S213 for prohibiting maintenance of the vehicle stationary by the hill hold control means, so that when the driver gets off the parking brake during idling stop, the braking force by the parking brake is applied to the engine. By causing the driver to promptly recognize the state where the creep force due to the restart is below when the door is opened, it is possible to prevent the vehicle from starting after the driver leaves the vehicle.
[0081]
(Third embodiment)
The third embodiment is an example in which forward clutch pressure control is added to the first embodiment, assuming that the driver gets off by operating the parking brake after the engine is restarted. The configuration of the third embodiment apparatus is the same as that of the first embodiment apparatus shown in the overall system diagram of FIG.
[0082]
Next, the operation will be described.
[0083]
[Idle stop control processing]
FIG. 4 is a flowchart showing the flow of the idle stop control process executed by the integrated control unit 33 of the third embodiment device. Each step will be described below (idle stop control means).
[0084]
In step S301, it is determined whether an idle stop is being performed. If YES, the process proceeds to step S305, and if NO, the process proceeds to step S302.
[0085]
In step S302, it is determined whether or not there is an engine stop request based on the determination that a non-idle stop is being performed in step S301. If YES, the process proceeds to step S303, and if NO, the process proceeds to return. The engine stop request is the same as that described in step S2 of FIG.
[0086]
In step S303, it is determined whether or not the driver's seat door is closed based on the determination that there is an engine stop request in step S302. If YES, the process proceeds to step S304, and if NO, the process proceeds to return.
[0087]
In step S304, the engine 1 is automatically stopped based on the determination that the driver's seat door is closed in step S303, and the process proceeds to step S313.
[0088]
In step S313, the engagement hydraulic pressure reduction of the forward clutch 7 is executed based on the automatic stop of the engine 1 in step S304, and the process proceeds to return.
[0089]
In step S305, it is determined whether or not there is a motor start request based on the determination that the engine is idling stop in step S301. If YES, the process proceeds to step S306, and if NO, the process proceeds to step S313. The motor start request is the same as that described in step S5 in FIG.
[0090]
In step S306, the engine 1 is started based on the determination that there is a motor activation request in step S305, and the process proceeds to step S307.
[0091]
In step S307, it is determined whether or not the brake is OFF. If YES, the process proceeds to step S308, and if NO, the process proceeds to step S314.
[0092]
In step S308, on the basis of the brake OFF determination in step S307, a hill hold operation that keeps the wheel cylinder hydraulic pressure supplied by the brake ON operation being started is started, and the process proceeds to step S309.
[0093]
In step S309, it is determined whether the driver's seat door is open. If YES, the process proceeds to step S312 and if NO, the process proceeds to step S310.
[0094]
In step S310, it is determined whether the hill hold cancellation condition is satisfied. If YES, the process proceeds to step S312 and if NO, the process proceeds to step S311. The hill hold cancellation condition is the same as that described in step S10 of FIG.
[0095]
In step S311, based on the determination that the hill hold cancellation condition is not satisfied in step S310, it is determined whether the hill hold time has passed the set fixed time. If YES, the process proceeds to step S312. If NO, the process returns to step S308.
[0096]
In step S312, the hill hold is canceled when one of the conditions of opening the driver's seat door in step S309, establishment of the hill hold cancellation condition in step S310, and elapse of the hill hold duration time in step S311 is satisfied, The process proceeds to step S315.
[0097]
In step S314, based on the brake ON determination in step S307, the hydraulic pressure start-up control (normal control) of the forward clutch 7 is executed, and the process proceeds to step S302.
[0098]
In step S315, simultaneously with the release of the hill hold in step S312, the hydraulic pressure rising early control of the forward clutch 7 is executed, and the process proceeds to step S302.
[0099]
[Idle stop control action]
When the engine is stopped due to a signal or the like and an engine stop request is issued, the flow proceeds to step S301 → step S302 → step S303 → step S304 → step S313 in the flowchart of FIG. When both conditions of closing the seat door are satisfied, the engine 1 is automatically stopped in step S304, and in step S313, control for lowering the hydraulic pressure of the forward clutch 7 is performed.
[0100]
Then, while the motor start request condition is not satisfied during the idle stop, the flow from step S301 to step S305 to step S313 is repeated in the flowchart of FIG. 4, and the forward clutch 7 is released.
[0101]
Thereafter, the motor start request condition is satisfied during the idle stop, but when the brake pedal 19 is kept depressed, in the flowchart of FIG. 4, step S301 → step S305 → step S306 → step S307 → step S314 → The flow proceeding to step S302 is repeated, and the engine 1 is automatically started in step S306. In this case, since the brake pedal 19 remains depressed, even if a creep force is generated by starting the engine 1, the braking force by the brake operation exceeds the creep force, and the vehicle is kept stationary. Further, the normal forward clutch engagement control for increasing the hydraulic pressure in accordance with the increase in the engine speed is executed for the released forward clutch 7.
[0102]
Further, when the brake pedal 19 is released after the engine 1 is restarted, in the flowchart of FIG. 4, the flow proceeds to step S301 → step S305 → step S306 → step S307 → step S308. In step S308, Hill hold control that keeps the wheel cylinder hydraulic pressure is started. At this time, if the driver's door is kept closed, the flow proceeds from step S308 to step S309 → step S310 (or step S311) → step S312 and when the engine speed exceeds the idling speed, or Hill hold control is canceled when a preset time has elapsed.
[0103]
However, after the engine 1 is restarted, when the driver operates the parking brake and releases the brake pedal 19 to open the door of the driver's seat and get off the vehicle, step S301 → step in the flowchart of FIG. The flow proceeds from S305 → step S306 → step S307 → step S308 → step S309 → step S312 → step S315. In step S308, the started hill hold control is canceled simultaneously with the detection of opening of the driver's seat door. At the same time, the forward clutch 7 is fastened earlier than the normal control by the hydraulic pressure rise early control of the forward clutch 7. In this case, since the braking force is only due to the parking brake, the creep force generated by the start of the engine 1 rises with good response due to the early engagement of the forward clutch 7, and exceeds the braking force due to the parking brake and the vehicle starts to move slightly. Before the driver leaves the vehicle, the driver can be made aware that the braking force by the brake is insufficient to keep the vehicle stationary.
[0104]
[When driver gets off after engine restart]
For example, in a scene where the driver opens the door with the parking brake released and the brake operation is released after the engine restarts, the sum of the braking force of the parking brake and the braking force by the hill hold slightly exceeds the creep force. Consider the situation.
[0105]
While the hill hold is in operation, the braking force that stops the vehicle exceeds the creep force generated when the engine 1 is started. Therefore, the vehicle does not start to move.
[0106]
On the other hand, the hill hold operation is intended to prevent the vehicle from retreating from the time when the braking operation is released until the engine 1 is started and the creep force is generated when the hill starts. The timing is after the time when the creep force rises, and considering the ease of driving when starting on a slope (being able to start easily without lowering back), it can be assumed that the timing is slightly delayed from the time when the creep force rises.
[0107]
In that case, a time lag of approximately 0.4 to 0.7 seconds will occur between the release of the brake operation and the release of the hill hold, and when the driver gets off by quickly opening the door during that time, Since the hill hold is released, the creep force exceeds the braking force of the parking brake, and the vehicle may start to move.
[0108]
In the case of the third embodiment device, in the scene where the driver opens the door after the engine is restarted and the brake operation is released after the engine is restarted, the hill hold is released immediately upon detecting the door opening. In addition, by speeding up the hydraulic pressure of the forward clutch 7 to make the driver quickly recognize that the braking force of the parking brake is below the creep force, the vehicle starts moving after the driver leaves the vehicle. This can be prevented.
[0109]
That is, the driver recognizes that the braking force of the parking brake is lower than the creep force by starting the movement of the vehicle. For example, when the shift position is switched from the D range position to the P range position, the driver then leaves the vehicle. Can also keep the vehicle stationary.
[0110]
Next, the effect will be described.
In the idle stop control device for a vehicle according to the third embodiment, the following effects can be obtained.
[0111]
(3) A vehicle speed sensor 48 for detecting the stop state of the vehicle, a brake stroke sensor 39 for detecting the brake operation state, the engine 1 is automatically stopped when the brake operation is performed in the vehicle stop state, and the forward clutch 7 is disconnected. When the brake operation is released, the engine 1 is automatically restarted, and the idle stop control means for gradually engaging the forward clutch 7 as the engine speed increases is provided. When the brake operation is released in the automatic stop state of 1, the hill hold control means for maintaining the vehicle stationary until a predetermined time after the release of the brake operation, the door switch 41 for detecting at least the opening / closing state of the driver side door, If the door opening is detected after the engine 1 is restarted, Hill hold cancellation step S312 for canceling the vehicle stationary maintenance by the threshold control means, and forward clutch engagement control step S315 for immediately increasing the engagement force of the forward clutch 7 when the opening of the door is detected after the engine 1 is restarted. Therefore, when the driver gets off the parking brake after the engine restarts, the driver promptly recognizes when the door is open that the braking force by the parking brake is below the creep force by the engine restart. Thus, it is possible to prevent the vehicle from moving after the driver leaves the vehicle. In addition, since the fastening force of the forward clutch 7 is raised earlier than in the first embodiment device, the rising response of the creep force due to the engine restart is improved, and the braking force due to the parking brake increases the creep force due to the engine restart. The lower state can be recognized promptly and reliably by the driver when the door is opened.
[0112]
(Fourth embodiment)
The fourth embodiment is an example in which forward clutch pressure control is added to the second embodiment on the assumption that the driver gets off by operating the parking brake during idle stop. The configuration of the fourth embodiment apparatus is the same as that of the first embodiment apparatus shown in the overall system diagram of FIG.
[0113]
Next, the operation will be described.
[0114]
[Idle stop control processing]
FIG. 5 is a flowchart showing the flow of the idle stop control process executed by the integrated control unit 33 of the fourth embodiment device. Each step will be described below (idle stop control means).
[0115]
In step S401, it is determined whether or not an idle stop is being performed. If YES, the process proceeds to step S405, and if NO, the process proceeds to step S402.
[0116]
In step S402, it is determined whether or not there is an engine stop request based on the determination that the non-idle stop is being performed in step S401. If YES, the process proceeds to step S403, and if NO, the process proceeds to return. The engine stop request is the same as that described in step S2 of FIG.
[0117]
In step S403, it is determined whether or not the driver's seat door is closed based on the determination that there is an engine stop request in step S402. If YES, the process proceeds to step S404, and if NO, the process proceeds to return.
[0118]
In step S404, the engine 1 is automatically stopped based on the determination that the driver's seat door is closed in step S403, and the process proceeds to step S415.
[0119]
In step S415, the engagement hydraulic pressure reduction of the forward clutch 7 is executed based on the automatic stop of the engine 1 in step S404, and the process proceeds to return.
[0120]
In step S405, it is determined whether or not there is a motor activation request based on the determination that the idle stop is being performed in step S401. If YES, the process proceeds to step S409, and if NO, the process proceeds to step S415. The motor start request is the same as that described in step S5 in FIG.
[0121]
In step S409, it is determined whether or not the driver's seat door is open. If YES, the process proceeds to step S413, and if NO, the process proceeds to step S406.
[0122]
In step S406, the engine 1 is started based on the determination that the driver's seat door is closed in step S409, and the process proceeds to step S416.
[0123]
In step S416, simultaneously with the start of the engine 1 in step S406, the hydraulic pressure start-up control (normal control) of the forward clutch 7 is executed, and the process proceeds to step S407.
[0124]
In step S407, it is determined whether or not the brake is OFF. If YES, the process proceeds to step S408, and if NO, the process proceeds to step S402.
[0125]
In step S408, on the basis of the brake OFF determination in step S407, a hill hold operation is started to keep the wheel cylinder hydraulic pressure supplied by the brake ON operation kept, and the process proceeds to step S410.
[0126]
In step S410, it is determined whether or not the hill hold cancellation condition is satisfied. If YES, the process proceeds to step S412. If NO, the process proceeds to step S411. The hill hold cancellation condition is the same as that described in step S10 of FIG.
[0127]
In step S411, based on the determination that the hill hold release condition is not satisfied in step S410, it is determined whether or not the hill hold time has passed the set fixed time. If YES, the process proceeds to step S412. If NO, the process returns to step S408.
[0128]
In step S412, when any one of the conditions for canceling the hill hold cancellation in step S410 and the elapse of the hill hold duration time in step S411 is satisfied, the hill hold is canceled and the process proceeds to step S402.
[0129]
In step S413, the operation of the hill hold is prohibited based on the determination that the driver's seat door is opened in step S409, and the process proceeds to step S414.
[0130]
In step S414, the engine 1 is started while prohibiting the operation of the hill hold in step S413, and the process proceeds to step S417.
[0131]
In step S417, simultaneously with the start of the engine 1 in step S414, the hydraulic pressure start-up control of the forward clutch 7 is executed, and the process proceeds to step S402.
[0132]
[Idle stop control action]
When the engine is stopped due to a signal or the like and an engine stop request is issued, the flow proceeds to step S401 → step S402 → step S403 → step S404 → step S415 in the flowchart of FIG. When both conditions of closing the seat door are satisfied, the engine 1 is automatically stopped in step S404, and in step S415, control is performed to reduce the hydraulic pressure of the forward clutch 7.
[0133]
During the idle stop, while the motor start request condition is not satisfied, the flow of going from step S401 to step S405 to step S415 is repeated in the flowchart of FIG. 5, and the forward clutch 7 is released.
[0134]
Thereafter, when the motor start request condition and the driver's seat door closing condition are satisfied during idle stop, the flow proceeds to step S401 → step S405 → step S409 → step S406 → step S416 in the flowchart of FIG. The engine is automatically started and the normal control for starting up the forward clutch 7 in synchronization with the increase in the engine speed is executed. If the brake pedal 19 is still depressed, the flow from step S416 to step S407 → step S402 is repeated. In this case, even if a creep force is generated by starting the engine 1 and fastening the forward clutch 7, the braking force by the brake operation exceeds the creep force, and the vehicle is kept stationary.
[0135]
Further, when the release operation of the brake pedal 19 is performed after the engine 1 is restarted, the flow proceeds to step S401 → step S405 → step S409 → step S406 → step S416 → step S407 → step S408 in the flowchart of FIG. In step S408, the hill hold control that keeps the wheel cylinder hydraulic pressure is started, and then the flow proceeds from step S408 to step S410 (or step S411) → step S412 and the engine speed is idling. The hill hold control is canceled when the number is exceeded or when a preset time has elapsed.
[0136]
However, if the driver is idling stop and before the engine 1 is restarted, the driver operates the parking brake, releases the brake pedal 19 to open the door of the driver's seat, and gets off the vehicle. 5, the flow proceeds from step S401 to step S405 to step S409 to step S413 to step S414 to step S417. In step S413, the operation of the hill hold that is executed for a predetermined time after the engine is restarted is prohibited. In S414, the engine 1 is started, and in step S417, control for increasing the hydraulic pressure of the forward clutch 7 is performed. That is, when the driver's seat door is opened, the hill hold operation is prohibited, and the creep force generated by starting the engine 1 and early engagement of the forward clutch 7 exceeds the braking force of the parking brake, and the vehicle starts to move slightly. Thus, the driver can be made aware that the braking force by the parking brake is insufficient to keep the vehicle stationary, before the driver leaves the vehicle.
[0137]
[When the driver gets off during idle stop]
For example, in a scene where the driver opens the door and releases the vehicle quickly when the parking brake is released and the brake operation is released before the engine restarts, the sum of the braking force of the parking brake and the braking force of the hill hold creeps. Consider a situation where the force is slightly higher.
[0138]
While the hill hold is in operation, the braking force that stops the vehicle exceeds the creep force generated when the engine 1 is started. Therefore, the vehicle does not start to move.
[0139]
On the other hand, the hill hold operation is intended to prevent the vehicle from retreating from the time when the braking operation is released until the engine 1 is started and the creep force is generated when the hill starts.
[0140]
In that case, when the driver opens the door with the parking brake released and the brake operation is released during idle stop, the engine 1 restarts, but at the same time, the hill hold operation is started and the hill hold operation is constant. Since it is released after the time has elapsed, the creeping force exceeds the braking force of the parking brake after the driver gets off, and the vehicle may start to move.
[0141]
In the case of the device of the fourth embodiment, in the scene where the driver opens the door with the parking brake released and the brake operation is released during the idling stop, the hill hold is prohibited when the door opening is detected, and the engine 1 To restart the hydraulic pressure of the forward clutch 7 so that the driver can quickly recognize that the braking force of the parking brake is below the creep force. Can be prevented from moving.
[0142]
That is, the driver recognizes that the braking force of the parking brake is lower than the creep force by starting the movement of the vehicle. For example, when the shift position is switched from the D range position to the P range position, the driver then leaves the vehicle. Can also keep the vehicle stationary.
[0143]
Next, the effect will be described.
In the vehicle idle stop control device of the fourth embodiment, the following effects can be obtained.
[0144]
(4) A vehicle speed sensor 48 for detecting the stop state of the vehicle, a brake stroke sensor 39 for detecting the brake operation state, the engine 1 is automatically stopped when the brake operation is performed in the vehicle stop state, and the forward clutch 7 is disconnected. When the brake operation is released, the engine 1 is automatically restarted, and the idle stop control means for gradually engaging the forward clutch 7 as the engine speed increases is provided. When the brake operation is released in the automatic stop state of 1, the hill hold control means for maintaining the vehicle stationary until a predetermined time after the release of the brake operation, the door switch 41 for detecting at least the opening / closing state of the driver side door, If the door opening is detected while the engine 1 is automatically stopped, Hill hold prohibiting step S413 for prohibiting the vehicle stationary by the yield control means, and engine restart control step S414 for automatically restarting the engine 1 immediately when the door opening is detected during the automatic stop of the engine 1. And a forward clutch engagement control step S417 that immediately raises the engagement force of the forward clutch 7 when the door opening is detected during the automatic stop of the engine 1, so that the driver applies the parking brake during the idle stop. When getting off the vehicle after it is activated, the driver can quickly recognize when the door is open that the braking force of the parking brake is less than the creep force of the engine restart. Can be prevented. In addition, since the fastening force of the forward clutch 7 is raised earlier than in the second embodiment, the rise response of the creep force by the engine restart is improved, and the braking force by the parking brake increases the creep force by the engine restart. The lower state can be recognized promptly and reliably by the driver when the door is opened.
[0145]
As mentioned above, although the idle stop control apparatus of the vehicle of this invention has been demonstrated based on 1st Example-4th Example, about a specific structure, it is not restricted to these Examples, Claims Modifications and additions of the design are permitted without departing from the spirit of the invention according to the claims.
[0146]
For example, in the first to fourth embodiments, an ABS brake hydraulic pressure actuator is used as the hill hold control means, and the braking force is applied by containing the hydraulic pressure supplied to the wheel cylinder by the brake operation. Although an example of maintaining the stationary state has been shown, as described in Japanese Patent Application Laid-Open No. 11-94070, etc., means for maintaining the stationary state of the vehicle by other methods such as fastening a brake engaging element in the automatic transmission It is also good.
[0147]
In the first to fourth embodiments, an example in which the starting clutch is a forward clutch of a continuously variable transmission is shown, but an engaging element that is fastened at the first speed in the D range of the stepped automatic transmission may be used.
[0148]
In the first to fourth embodiments, an example is shown in which the fastening force of the starting clutch is raised in accordance with the increase of the engine rotation step during the automatic restart of the engine. However, the driving force is not dependent on the engine speed at the time of ignition. It is included as long as it performs the engaging force control of the starting clutch that smoothly starts up. At this time, an external additional oil pump may be used as in the first to fourth embodiments, and the system operation is operated well by optimally controlling the starting clutch even without an external additional oil pump. Are also included.
[Brief description of the drawings]
FIG. 1 is an overall system diagram showing an idle stop control device for a vehicle according to a first embodiment.
FIG. 2 is a flowchart showing a flow of an idle stop control process executed by a total control unit of the first embodiment apparatus.
FIG. 3 is a flowchart showing a flow of an idle stop control process executed by an integrated control unit of the second embodiment apparatus.
FIG. 4 is a flowchart showing a flow of an idle stop control process executed by a total control unit of the third embodiment apparatus.
FIG. 5 is a flowchart showing a flow of an idle stop control process executed by the integrated control unit of the fourth embodiment apparatus.
[Explanation of symbols]
1 engine
2 continuously variable transmission
3 Motor generator
4 Engine output shaft
5 Torque converter
6 Turbine rotating shaft
7 Forward clutch
8 Transmission input shaft
9 Primary pulley
10 V belt
11 Secondary pulley
12 Transmission output shaft
13 External additional oil pump
14 battery
15 Inverter
16 Crank pulley
17 Motor pulley
18 belt
19 Brake pedal
20 Brake booster
21 Master cylinder
22, 23 Master cylinder hydraulic pipe
24 ABS brake hydraulic actuator
25, 26, 27, 28 Wheel cylinder hydraulic pipe
29, 30, 31, 32 Wheel cylinder
33 Total control unit
34 Engine control module
35 CVT control module
36 Brake control module
37 Battery controller
38 Motor controller
39 Brake stroke sensor (brake operation state detection means)
40 Tilt sensor
41 Door switch (door open / close detection means)
42 Engine hood switch
43 Engine water temperature sensor
44 CVT oil pressure sensor
45 CVT oil temperature sensor
46 Two-way communication line
47 Accelerator position sensor
48 Vehicle speed sensor (vehicle stop state detection means)
49 inhibitor switch
50 Two-way communication line
51 Brake booster negative pressure sensor
52 Two-way communication line

Claims (4)

Vehicle stop state detecting means for detecting the stop state of the vehicle;
Brake operation state detection means for detecting the brake operation state;
An idle stop control means for automatically stopping the engine when the brake is operated while the vehicle is stopped, and automatically restarting the engine when the brake is released;
In an idle stop control device for a vehicle equipped with
A hill hold control means for maintaining the vehicle stationary until a predetermined time after the release of the brake operation when the brake operation is released in the automatic stop state of the engine,
Door opening / closing detection means for detecting at least the opening / closing state of the door on the driver's seat side;
A hill hold release means for releasing the maintenance of the vehicle stationary by the hill hold control means when door opening is detected after the engine is restarted;
An idle stop control device for a vehicle, comprising: Vehicle stop state detecting means for detecting the stop state of the vehicle;
Brake operation state detection means for detecting the brake operation state;
An idle stop control means for automatically stopping the engine when the brake is operated while the vehicle is stopped, and automatically restarting the engine when the brake is released;
In an idle stop control device for a vehicle equipped with
A hill hold control means for maintaining the vehicle stationary until a predetermined time after the release of the brake operation when the brake operation is released in the automatic stop state of the engine,
Door opening / closing detection means for detecting at least the opening / closing state of the door on the driver's seat side;
An engine restart control means for automatically restarting the engine immediately when a door opening is detected during the automatic stop of the engine;
A hill hold prohibiting means for prohibiting maintenance of the vehicle stationary by the hill hold control means when a door opening is detected during the automatic stop of the engine;
An idle stop control device for a vehicle, comprising: Vehicle stop state detecting means for detecting the stop state of the vehicle;
Brake operation state detection means for detecting the brake operation state;
Idle stop control means for automatically stopping the engine when the brake operation is performed while the vehicle is stopped and disconnecting the starting clutch, and automatically restarting the engine when releasing the brake operation and gradually engaging the starting clutch;
In an idle stop control device for a vehicle equipped with
A hill hold control means for maintaining the vehicle stationary until a predetermined time after the release of the brake operation when the brake operation is released in the automatic stop state of the engine,
Door opening / closing detection means for detecting at least the opening / closing state of the door on the driver's seat side;
A hill hold release means for releasing the maintenance of the vehicle stationary by the hill hold control means when door opening is detected after the engine is restarted;
A starting clutch fastening control means for immediately raising the fastening force of the starting clutch when door opening is detected after restarting the engine;
An idle stop control device for a vehicle, comprising: Vehicle stop state detecting means for detecting the stop state of the vehicle;
Brake operation state detection means for detecting the brake operation state;
Idle stop control means for automatically stopping the engine when the brake operation is performed while the vehicle is stopped and disconnecting the starting clutch, and automatically restarting the engine when releasing the brake operation and gradually engaging the starting clutch;
In an idle stop control device for a vehicle equipped with
A hill hold control means for maintaining the vehicle stationary until a predetermined time after the release of the brake operation when the brake operation is released in the automatic stop state of the engine,
Door opening / closing detection means for detecting at least the opening / closing state of the door on the driver's seat side;
A hill hold prohibiting means for prohibiting maintenance of the vehicle stationary by the hill hold control means when a door opening is detected during the automatic stop of the engine;
An engine restart control means for automatically restarting the engine immediately when a door opening is detected during the automatic stop of the engine;
A starting clutch fastening control means for immediately raising the fastening force of the starting clutch when door opening is detected during automatic stop of the engine;
An idle stop control device for a vehicle, comprising:

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