JP2012102647A - Engine automatic stop restart device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a burden on a driver for continuing an operation on a brake pedal for operating a foot brake, and to prevent restart or launch due to decrease in operating force not intended by the driver on the brake pedal, in an engine automatic stop restart device.SOLUTION: In the engine automatic stop restart device, a control condition detection means for detecting an automatic stop condition and restart condition of an engine mounted on a vehicle includes: a brake operation detection means for detecting a brake operation insufficiency state of the brake pedal for operating a foot brake applying brake force to a wheel; and a launch related operation detection means for detecting a launch related operation performed by a driver in connection with the launch of a vehicle. The engine restart is performed when the launch related operation is detected by the launch related operation detection means while the brake operation insufficiency state is detected by the brake operation detection means (S2), in other words, when the launch intention of the driver is detected (S6).

Description

  The present invention relates to an engine automatic stop / restart device that automatically stops an engine mounted on a vehicle when an automatic stop condition is satisfied and restarts when a restart condition is satisfied. The present invention relates to an engine automatic stop / restart device that performs restart when a brake operation unit of a brake device is involved.

  As a technology for reducing energy consumption (for example, fuel consumption) of engines mounted on vehicles and reducing emissions of environmentally hazardous substances (for example, carbon dioxide), the engine is stopped by the driver when the vehicle is stopped, such as waiting for a signal. There is an engine automatic stop / restart device that performs automatic engine stop (so-called idling stop) when a predetermined automatic stop condition is satisfied, and restarts when a predetermined restart condition is satisfied without requiring an operation. .

  In such an engine automatic stop / restart device, the engine is restarted based on a change in brake fluid pressure generated according to the amount of depression of the brake pedal of the service brake device (corresponding to the main brake device). Is known (see, for example, Patent Document 1).

Japanese Patent No. 3613970

When the engine is restarted in response to the operation of the brake pedal, in order to prevent an inadvertent restart, it is necessary to keep stepping on the brake pedal without releasing it, which imposes a burden on the driver. There is.
In addition to releasing the brake pedal, in addition to the case where the driver intends to start, the driver does not need to press the brake pedal when he / she takes an object in the passenger compartment or operates the accessory. May be restarted due to an unintended release operation of the brake pedal, and may further lead to the start of the vehicle.

  The present invention has been made in view of such circumstances, and in the engine automatic stop / restart device, it is intended to reduce the burden on the driver for continuing the operation on the brake operation unit that operates the main brake. An object of the present invention is to prevent restart or start caused by a decrease in an operation force not intended by a driver with respect to a brake operation unit.

  The invention according to claim 1 is a control condition detection means (40) for detecting an automatic stop condition and a restart condition of the engine (2) mounted on the vehicle (1), and when the automatic stop condition is satisfied. In the engine automatic stop / restart device comprising: control means (80) for automatically stopping the engine (2) and restarting the engine (2) when the restart condition is satisfied. The detecting means (40) is a brake operation detecting means (detecting a brake operation insufficient state of the brake operating section (22) for operating the main brake (21) for applying a braking force to the wheels (4) of the vehicle (1). 44) and a start-related operation detecting means (50) for detecting a start-related operation performed by the driver in relation to the start of the vehicle (1), and the restart condition is detected as a state where the brake operation is insufficient. When it is, which is the starting-related operation is automatic engine stop and restart device is to be detected.

  According to this, since the start-related operation is an operation performed based on the driver's intention to start, even if the brake operation is insufficient, the driver can perform the start-related operation indicating the start intention. The engine will not restart until done. As a result, since it is not necessary to maintain the operation state of the brake operation unit in order to continue the automatic stop state, for example, it is possible to wait for a signal with the brake operation unit released, and to continue the operation on the brake operation unit The driver's burden for the vehicle can be reduced. Furthermore, restarting that is not intended by the driver is prevented, and in turn, starting of the vehicle that is not intended by the driver is prevented. Further, when the driver intends to start, the driver can perform a start-related operation after releasing the operation of the brake operation unit, thereby enabling quick restart and start.

According to a second aspect of the present invention, in the engine automatic stop / restart device according to the first aspect, in the vehicle (1), the accelerator operation unit is operated from an accelerator release position in the vehicle (1). The brake operation unit (22) is operated until the insufficient brake operation state is resolved, the steering wheel is operated to a predetermined steering angle or more or a predetermined steering torque or more, the parking brake (31) is deactivated, The shift operation unit of the transmission (3a) is operated, and the clutch operation unit that operates the clutch that transmits and shuts off the power of the engine (2) to the wheels (4) is operated from the release position to the operation position. A manual starting means (6) operated by a driver to start the engine (2) is started at a starting position where the engine (2) is started. The manipulated thing is of at least one.
According to this, the driver's intention to start is determined by the driver's operation of the accelerator operation unit, the operation of the brake operation unit that resolves insufficient braking operation, the steering wheel operation, the parking brake operation, the clutch operation, and the manual starting means. It can be detected through at least one operation.

According to a third aspect of the present invention, in the engine automatic stop / restart device according to the first or second aspect, the vehicle (1) brakes the wheel (4) separately from the brake operation unit (22). Brake force applying means (26, 30) capable of applying force, and the control means (80) operates the brake force applying means (26, 30) when the insufficient brake operation state is detected. Is to do.
According to this, when a state of insufficient brake operation by the brake operation unit occurs, the brake force is applied to the wheel by the brake force applying unit separate from the brake operation unit, so that the operation to the brake operation unit is continued. This reduces the burden on the driver and prevents the vehicle from starting unintentionally.

According to a fourth aspect of the present invention, in the engine automatic stop / restart device according to the third aspect, the control means (80) detects the start-related operation when the insufficient brake operation state is detected. When this is done, the brake force applying means (26, 30) is deactivated and restarted.
According to this, when a start-related operation indicating the driver's intention to start is detected, the braking is released by the braking force applying means and the restart is performed, so that the vehicle can be started smoothly.

According to a fifth aspect of the present invention, in the engine automatic stop / restart device according to the third or fourth aspect of the present invention, the engine automatic stop / restart apparatus further comprises a restart request detecting means (70) for detecting a restart request for requesting the restart, and the control means. (80) is a case where the brake operation insufficient state is detected and the start related operation is not detected, and when the restart request is detected, the operation of the brake force applying means (30) and The restart is performed or the restart is prohibited.
According to this, when an insufficient brake operation state is detected and a start-related operation is not detected, and therefore when the driver does not indicate a start intention, the engine is operated based on the vehicle state not related to the start intention of the driver. When a restart request that requires restart is detected, the engine is restarted in a state where the brake force applying means is operated, so that the vehicle is prevented from starting unintentionally by the driver.

A sixth aspect of the present invention is the engine automatic stop / restart device according to the third or fourth aspect, wherein the brake force applying means (26) holds the brake force of the main brake (21). (26), comprising a parking brake state detecting means (47) for detecting an insufficient brake force state of the parking brake (31) of the parking brake device (30) of the vehicle (1), and the control means (80) The brake force holding device (26) is operated when the brake operation insufficient state is detected and the brake force insufficient state is detected.
According to this, when the brake operation is insufficient due to the release of the brake operation unit, etc., when the parking brake is in a state where the brake force is insufficient due to the parking brake being released, the brake force holding device automatically Brake force is applied to the wheels. As a result, even when the parking brake operation is omitted, the start of the vehicle can be prevented while reducing the burden on the driver for continuing the operation of the brake operation unit, and the start of the vehicle not intended by the driver can be prevented. it can.

According to a seventh aspect of the present invention, in the automatic engine stop / restart device according to the sixth aspect, the parking brake device (30) is an automatic parking brake device (30b), and the control means (80) When the brake operation insufficient state is detected, when the start-related operation is not detected and the restart request is detected, the operation of the parking brake (31), the brake force holding device (26 ) Release and restart.
According to this, when a start-related operation is not detected, and therefore when the driver does not indicate a start intention, a restart request that requires a restart of the engine based on a vehicle state that is not related to the driver's start intention When is detected, the engine is restarted with the parking brake activated, so that the vehicle is prevented from starting unintentionally by the driver. The driver can start the vehicle by releasing the parking brake.

  According to the present invention, in the engine automatic stop / restart device, it is possible to reduce the burden on the driver for continuing the operation on the brake operation unit that operates the main brake, and the operation unintended by the driver on the brake operation unit. It is possible to prevent restart or start due to power reduction.

1 is a schematic diagram of a vehicle including an engine automatic stop / restart device according to a first embodiment of the present invention. It is a figure explaining the structure of the engine automatic stop restart apparatus of FIG. It is a flowchart explaining the control of restart by the engine automatic stop restart apparatus of FIG. It is a time chart which shows an example from the automatic stop by the engine automatic stop restart apparatus of FIG. 1 to restart. It is a schematic diagram of the principal part of a vehicle provided with the engine automatic stop restart apparatus which is 2nd Embodiment of this invention, and is a figure corresponding to a part of FIG. It is a flowchart explaining the control of restart by the engine automatic stop restart apparatus of 2nd Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to FIGS.
1-4 is a figure explaining 1st Embodiment of this invention.
Referring to FIG. 1, an engine automatic stop / restart device 12 according to an embodiment of the present invention includes an automatic stop of an engine 2 that is an internal combustion engine as a driving motor mounted on a vehicle 1 that is a four-wheeled vehicle, for example. A restart that is a start from the automatic stop state is performed.

The vehicle 1 includes an engine 2, a power transmission device 3 that transmits power generated by the engine 2 to the drive wheels 4 a, a vehicle control device 10 that includes an engine automatic stop / restart device 12, a battery 5, and the engine 2. A key switch 6 as manual start / stop means operated by the driver of the vehicle 1 to start and stop, a foot brake device 20 as a main brake device for braking the wheels 4 including the drive wheels 4a, a parking brake device 30, Is provided.
The parking brake device 30 includes a manual parking brake device 30a and an electric parking brake device 30b as an automatic parking brake device. The key switch 6 is also a manual starting means that is operated by the driver as a start-related operation in order to restart the engine 2 that has been automatically stopped by the engine automatic stop / restart device 12.

The engine 2 includes a crankshaft 2a serving as an engine output shaft and a starter motor 7 serving as a starting device that rotationally drives the crankshaft 2a during starting.
The power transmission device 3 includes an automatic transmission 3a that shifts the power input from the crankshaft 2a and outputs the power to the drive wheels 4a. The transmission 3a may be a gear type transmission or a continuously variable transmission (for example, a belt type continuously variable transmission).
In addition to the engine automatic stop / restart device 12, the control device 10 controls the transmission ratio of the engine control device 11 that performs combustion control (for example, air-fuel ratio control and ignition control) related to combustion in the engine 2 and the transmission 3a. And a brake control device 14 for controlling the foot brake device 20 and the electric parking brake device 30b. The engine automatic stop / restart device 12 and the control devices 11, 13, and 14 each include a computer.

  A key switch 6 for switching between connection and disconnection between the battery 5 and vehicle electrical components (including engine electrical components such as a starter motor 7 provided in the engine 2 and the control device 10) is a starter position and the battery 5 and starter. The motor 7 is connected, the vehicle electrical components other than the starter motor 7 and the battery 5 are connected at the on position, and the vehicle electrical component and the battery 5 are disconnected at the off position.

  The foot brake device 20 which is a disc brake device is operated by a driver to operate and release the brake caliper 21 which is a foot brake as a main brake that applies a braking force to each wheel 4 and the brake caliper 21. The brake pedal 22 as a brake operation unit, the hydraulic actuator 23 as an actuator that drives the brake caliper 21 in response to the operation of the brake pedal 22, and the operation unit of the brake caliper 21 are separate operation units. And a brake force holding device 26 as a brake auxiliary operation unit capable of releasing the operation.

The brake caliper 21 is a brake pad (not shown) that can contact a disk rotor (not shown) that rotates integrally with each wheel 4 and a movable body that drives a brake pad so that the disk rotor can be clamped. A wheel cylinder 21a is provided.
The hydraulic actuator 23 is disposed between a master cylinder 23a that generates a brake hydraulic pressure P (see FIG. 4) corresponding to a pedaling force that is an operation force applied to the brake pedal 22, and between the brake pedal 22 and the master cylinder 23a. And a brake hydraulic pressure circuit 23c that transmits the brake hydraulic pressure P generated in the master cylinder 23a as a driving force to the wheel cylinder 21a of the brake caliper 21.

The brake caliper 21 can apply a frictional force acting between the disc rotor and the brake pad to the wheel 4 as a braking force. When the brake caliper 21 is operated, the brake caliper 21 applies a braking force to the wheel 4 to brake the wheel 4. When the operation is released, the braking force on the wheel 4 is released and the braking on the wheel 4 is released.
The master power 23b is a pneumatic actuator that uses air pressure, which is a negative pressure generated by the operation of the engine 2, and generates an operation assisting force proportional to the pedaling force applied to the brake pedal 22 during braking to reduce the driver's pedaling force. Reduce.

  The brake force holding device 26 is a brake hydraulic pressure holding device including a control valve 26a formed of an electromagnetic valve controlled by the brake control device 14 and a check valve 26b, and is provided between the master cylinder 23a and each wheel cylinder 21a. The brake fluid pressure circuit 23c is incorporated. The brake force holding device 26 operates when the brake hydraulic pressure P generated in the master cylinder 23a decreases from a value exceeding a predetermined hydraulic pressure value P1 (see FIG. 4) to a predetermined hydraulic pressure value P1 or less. A braking force is applied to each wheel 4 through 21.

Specifically, an operation shortage state in which the depression amount, which is the operation amount of the brake pedal 22, decreases due to a decrease in the depression force applied to the brake pedal 22, such as the release of the brake pedal 22, occurs by the master cylinder 23a. When the generated brake fluid pressure P decreases and the brake fluid pressure sensor 43 (see FIG. 2) detects that the brake fluid pressure P has decreased to a predetermined fluid pressure value P1, the control valve 26a is connected to the wheel cylinder 21a and the master. The communication with the cylinder 23a is cut off.
Thereby, the brake fluid having the brake fluid pressure Pa of the predetermined fluid pressure value P1 is confined between the brake force retaining device 26 and the wheel cylinder 21a, and the brake force applied to the wheel 4 is maintained. Further, the control valve 26a allows the wheel cylinder 21a and the master cylinder 23a to communicate with each other, so that the brake hydraulic pressure Pa is reduced when the brake pedal 22 is released, and the brake caliper 21 can be released. Therefore, the brake force holding device 26 is a brake force applying means that can operate and release the brake caliper 21 and can apply the brake force to the wheels 4 by the brake caliper 21.

Here, the operation state of the brake pedal 22 that causes the insufficient operation state is a state in which the brake pedal 22 is released and a brake force that can prevent the vehicle 1 from starting when the brake pedal 22 is depressed. Including situations that are insufficient to allow
The brake fluid pressure sensor 43 (see FIG. 2) detects the brake fluid pressure P generated by the master cylinder 23a. The predetermined hydraulic pressure value P1 is a value that can prevent the vehicle 1 from starting due to a creep phenomenon in the transmission 3a, and can prevent the vehicle 1 from starting due to its own weight due to the road surface gradient when the vehicle stops, so that the stopped state can be maintained. Set to

  The manual parking brake device 30a includes a parking brake 31 that is a manual parking brake that applies braking force to the wheels 4 (for example, rear wheels), and a parking brake that is operated by a driver to operate and release the parking brake 31. A parking brake lever 32a as an operation unit and an actuator 33a that drives the parking brake in response to an operation by the parking brake lever 32a are provided.

On the other hand, the electric parking brake device 30 b is an electric parking brake 31 that is an electric parking brake as an automatic parking brake that applies a braking force to the wheels 4, and an electric motor that is an actuator that drives the parking brake 31 in response to an operation by the brake control device 14. And a motor 33b. Therefore, the parking brake 31 is a component common to the manual parking brake device 30a and the electric parking brake device 30b. Moreover, the operation | movement cancellation | release of the electric parking brake apparatus 30b is also possible by operation of a driver | operator, for example, operation of a release switch.
The parking brake 31 applies a braking force to the wheel 4 when the parking brake 31 is operated, brakes the wheel 4, and releases the braking force applied to the wheel 4 when the operation is released to release the braking on the wheel 4.

  The electric parking brake device 30 b is a braking force applying unit that can apply a braking force to the wheels 4. The electric parking brake device 30b is compared with the brake force holding device 26 in which the operation time is limited by the decrease in the brake fluid pressure P due to the heat generation of the control valve 26a and the leakage of the hydraulic fluid from the minute gap of the control valve 26a. A constant braking force that is stable over a long time can be applied to the wheel 4.

Referring to FIG. 1 as appropriate mainly with reference to FIG. 2, the engine automatic stop / restart device 12 detects the automatic stop condition and the restart condition of the engine 2, and detects the automatic stop prohibition condition. Automatic stop prohibiting condition detecting means (or idling stop prohibiting condition detecting means) 60, restart request detecting means 70 for detecting a request for restart of engine 2, stop means 8 for stopping engine 2 and engine 2 And a control means 80 for controlling the starter motor 7 as a starting means for starting the motor.
The detection signals of the control condition detection means 40, the automatic stop prohibition condition detection means 60, and the restart request detection means 70 are input to the control means 80.

The stop means 8 provided in the engine 2 stops the operation (for example, fuel supply by the fuel injection valve) of a device (for example, a fuel injection valve) involved in combustion.
Then, based on the detection signal input from the control condition detection means 40, the control means 80 activates the stop means 8 to automatically stop the engine 2 when the automatic stop condition is satisfied, thereby entering the idling stop state. On the other hand, when the restart condition is satisfied, the starter motor 7 is operated to restart the engine 2.

The control condition detection means 40 includes a manual start / stop operation detection means 41 that detects the operation position of the key switch 6 including the off position and the on position, and the vehicle 1 (see FIG. 1) stops (that is, the vehicle speed is zero). ) For detecting the vehicle speed sensor 42, the brake fluid pressure sensor 43, the brake operation detecting means 44 for detecting the brake operation insufficient state and the brake effective operation state, which are the brake operation states of the brake pedal 22, and the driver 1 And a start related operation detecting means 50 for detecting a start related operation performed in relation to the start of the vehicle.
Here, the brake operation state of the brake pedal 22 in the brake effective operation state detected by the brake operation detection means 44 is a state other than the brake operation insufficient state, and the amount of depression of the brake pedal 22 is stopped. It is in a state where the start of can be prevented. When the brake pedal 22 is in the brake effective operation state, the brake hydraulic pressure P is equal to or higher than the predetermined hydraulic pressure value P1.

  The start-related operation detection means 50 is a manual start / stop operation detection means 41, a brake operation detection means 44, and an accelerator operation (accelerator pedal depression operation) from the release position and release position of an accelerator pedal as an accelerator operation section. ), A steering operation sensor 46 for detecting steering operation through a steering angle or steering torque of the steering wheel that is assisted by the power steering device, and a braking force of the parking brake 31 by the manual parking brake device 30a. A parking brake state detecting unit 47 that detects an insufficiency state and a shift operation detecting unit 48 that detects an operation of a shift lever as a shift operation unit of the transmission 3a are provided.

The parking brake state detection means 47 detects a braking force shortage state and a braking force effective state, which are braking force states by the manual parking brake device 31a. The state where the braking force is insufficient includes a state where the braking force is not applied to the wheels 4 (that is, an operation release state) and a state where the braking force is insufficient to prevent the vehicle 1 from stopping. The braking force effective state is a state other than the braking force insufficient state, and is a state in which the vehicle 1 (see FIG. 1) whose braking force is stopped can be prevented from starting. The magnitude of the brake force can be detected by detecting, for example, the operation amount of the parking brake lever 32a and the force (for example, the pulling force) acting on the actuator 33a.
The shift operation detection means 48 detects a shift position switching operation between a non-travel position that is a neutral position or a parking position and a travel position such as a drive position or a reverse position in the transmission 3a.

The automatic stop prohibition condition detection means 60 switches between permission and prohibition of automatic stop by the accelerator sensor 45, the handle operation sensor 46, the parking brake state detection means 47, and the engine automatic stop / restart device 12 operated by the driver. An automatic stop prohibiting switch (or idling stop prohibiting switch) 61 as an automatic stop switching operation means, an engine temperature sensor 62 for detecting the temperature of engine cooling water as an engine temperature, and an air conditioner operation request / stop request are detected. The air conditioner switch 63, a passenger compartment temperature sensor 64 for detecting the passenger compartment temperature, an outdoor air temperature sensor 65 for detecting the outdoor air temperature, and an inclination sensor 66 for detecting the inclination state of the vehicle 1 when the vehicle is stopped.
The inclination sensor 66 detects the gradient of the road surface on which the vehicle 1 has stopped through the inclination of the vehicle 1.

Further, the restart request detecting means 70 is a charge amount detecting means 71 for detecting the charge amount of the battery 5, an operating pressure sensor 72 for detecting the operating pressure of the master power 23b, and the operating limit state of the brake force holding device 26. A brake force holding state detecting means 73 for detecting and a passenger compartment temperature sensor 64 are provided.
In the operation limit state of the brake force holding device 26, the brake fluid pressure Pa (see FIG. 4) acting on the wheel cylinder 21a when the brake force holding device 26 is operated is reduced due to the leakage of the hydraulic fluid, thereby ensuring a required brake force. It includes that the lower limit hydraulic pressure value cannot be reached, and that the operation time of the brake force holding device 26 is longer than a predetermined operation time set from the viewpoint of preventing overheating due to heat generation of the control valve 26a.
Here, the value below the lower limit hydraulic pressure value is a value smaller than the predetermined hydraulic pressure value P1. Further, the lower limit hydraulic pressure value of the brake hydraulic pressure Pa and the operation time of the control valve 26a are detected by detection means such as a hydraulic pressure sensor and a timer, respectively.

  The automatic stop condition is that the stop of the vehicle 1 is detected by the vehicle speed sensor 42 while the key switch 6 is detected to be in the ON position by the manual start / stop operation detecting means 41, brake fluid It includes that the brake fluid pressure P equal to or greater than the predetermined fluid pressure value P1 is detected by the pressure sensor 43.

The automatic stop prohibition condition is that the automatic stop prohibit switch 61 is set to prohibit automatic stop, the accelerator sensor 45 detects the accelerator operation from the release position of the accelerator pedal, and the engine temperature sensor 62 detects the engine. 2 is detected to be equal to or lower than a predetermined temperature indicating that the engine 2 is warmed up (that is, the engine 2 is not warmed up), the steering operation sensor 46 activates the power steering device. When a steering angle greater than a predetermined steering angle or a steering torque greater than a predetermined steering torque is detected, when an air conditioner operation request is detected by the air conditioner switch 63, and when the air conditioner switch 63 is in an operation request In addition, a temperature difference greater than a predetermined temperature difference with respect to the set temperature of the air conditioner is detected by the passenger compartment temperature sensor 64 When the room temperature is detected, the outside air temperature sensor 65 detects the temperature at which the outside air temperature is extremely high (for example, 40 ° C. or higher) or extremely low temperature (for example, −20 ° C. or lower), The sensor 66 detects an inclination exceeding a predetermined inclination angle (that is, an inclination exceeding a predetermined inclination value of the road surface), and the parking brake state detecting means 47 detects an insufficient braking force state of the manual parking brake device 30a. That is included.
In order for the engine 2 to be automatically stopped, it is necessary that all conditions of the automatic stop condition are satisfied, and that each condition of the automatic stop prohibition condition is not satisfied.

  The restart condition is that the manual start / stop operation detecting means 41 detects that the key switch 6 is in the ON position, and the brake operation detecting means 44 is in a state where the brake operation is insufficient. The start-related operation detecting means 50 detects the start-related operation when the is detected.

For the start-related operations, in the vehicle 1, the accelerator pedal is operated from the accelerator release position, the brake pedal 22 is depressed into the brake effective operation state, the handle is operated, the transmission The shift lever of 3a is operated from the non-travel position to the travel position, the manual parking brake device 30a is deactivated, and the key switch 6 operated by the driver to start the engine 2 activates the starter motor 7. To be operated to a starting position.
Thus, since the start-related operation is an operation indicating the driver's intention to start, the start-related operation detection means 50 is a start intention detection means.

  Further, in the restart request, it is detected by the charge amount detection means 71 that the charge amount of the battery 5 has decreased to the lower limit charge amount, and the operating pressure sensor 72 detects that the operating pressure of the master power 23b is insufficient. That is, the brake force holding state detecting means 73 detects the operation limit state of the brake force holding device 26, and the air conditioner switch 63 has a predetermined temperature relative to the set temperature of the air conditioner when the air conditioner switch 63 is in an operation request. The detection of the temperature in the passenger compartment with a temperature difference greater than or equal to the difference is included.

Next, a restart control method executed by the control means 80 of the engine automatic stop / restart apparatus 12 will be described with reference to FIGS.
In step S1, it is determined by the engine automatic stop / restart device 12 whether or not the engine 2 is in an automatically stopped state. When the engine 2 is in an automatically stopped state, the process proceeds to step S2. When the engine 2 is not in the automatic stop state, the processes after step S2 are not executed.

  In step S2, it is determined whether or not the brake operation state of the brake pedal 22 detected by the brake operation detection means 44 is a brake operation insufficient state. When the brake operation state is a brake effective operation state, an automatic stop state is established. Is maintained. On the other hand, when the brake operation state is a state where the brake operation is insufficient due to, for example, the release of the brake pedal 22, the process proceeds to step S3. In step S3, when it is detected by the parking brake state detecting means 47 that the braking force state of the parking brake 31 by the manual parking brake device 30a is a state where the braking force is insufficient, the process proceeds to step S4, and the brake control device 14 The brake force holding device 26 is actuated to apply a brake force to each wheel 4 to maintain the vehicle 1 in a stopped state, and the process proceeds to step S5. If it is determined in step S3 that the manual parking brake 31 by the manual parking brake device 30a is operating and the brake force is in an effective state, the process proceeds to step S6 without operating the brake force holding device 26.

  When the brake force holding device 26 is operated because the brake force state by the manual parking brake device 30a is insufficient, the brake force holding state is detected by the brake force holding state detecting means 73 (see FIG. 2) in step S5. It is determined whether or not the device 26 is in the operation limit state. When the device 26 is not in the operation limit state, the process proceeds to step S6. On the other hand, when the brake force holding device 26 is in the operation limit state, the process proceeds to step S7, the electric parking brake device 30b is operated, the brake force holding device 26 is released, and the electric parking brake device 30b The vehicle 1 is maintained in a stopped state, and the process proceeds to step S6.

  In step S6, the presence or absence of a start-related operation, that is, the presence or absence of the driver's intention to start, is determined based on the detection signal of each detection means constituting the start-related operation detection means 50. move on. In step S8, the control means 80 operates the starter motor 7 to restart the engine 2. When the electric parking brake device 30b is operating, the control means 80 releases the operation through the brake control device 14, and the brake When the force holding device 26 is operating, the operation is released through the brake control device 14 and the braking of each wheel 4 is released.

On the other hand, when it is determined in step S6 that there is no intention to start, the process proceeds to step S9, where it is determined whether or not there is a restart request. It is determined whether or not it is in a limit state. When there is a restart request in step S9, the process proceeds to step S10.
In step S10, the electric parking brake device 30b is activated through the brake control device 14 when the operation is released, and is maintained during the operation state, and the brake force holding device is maintained through the brake control device 14. When 26 is in the activated state, it is in the deactivated state, and when it is in the deactivated state, it is maintained in the deactivated state. Furthermore, the starter motor 7 is operated and the engine 2 is restarted.

The restart of the engine 2 in step S8 and the release of the operation of the electric parking brake device 30b or the brake force holding device 26 are performed almost simultaneously, or the operation of the electric parking brake device 30b or the brake force holding device 26 is released. Is performed slightly later than the restart.
Further, the restart of the engine 2 and the release of the operation of the brake force holding device 26 in step S10 are performed almost simultaneously, or the release of the operation of the brake force holding device 26 is performed slightly later than the restart. Is called. Then, the operation of the electric parking brake device 30b and the operation release of the brake force holding device 26 are performed almost simultaneously, or the operation release of the brake force holding device 26 is slightly delayed from the operation of the electric parking brake 30b. Done.

Next, an example from the deceleration of the vehicle 1 provided with the engine automatic stop control device to the start of the vehicle 1 through automatic stop and restart will be described with reference to FIG.
When the vehicle 1 decelerates and stops, the accelerator pedal is released and the brake pedal 22 is depressed, so that the brake hydraulic pressure P increases due to the operation of the master cylinder 23a at time t1. Then, when the vehicle speed becomes 0 at time t2 and the vehicle 1 stops and the brake fluid pressure P is equal to or greater than the predetermined fluid pressure value P1, the automatic stop condition is satisfied. When the automatic stop prohibition condition is not satisfied, the engine 2 is automatically stopped.

When the manual parking brake device 30a is in a state where the brake force is insufficient when the driver performs an operation to release the brake pedal 22 regardless of whether the driver intends to start or not during the automatic stop, the master cylinder 23a When the brake fluid pressure P at which the pressure is generated decreases and reaches the predetermined fluid pressure value P1 at time t3, the brake fluid pressure sensor 43 detects the predetermined fluid pressure value P1, and the brake force holding device 26 operates.
For this reason, the brake hydraulic pressure Pa of the wheel cylinder 21a of the brake caliper 21 is maintained at the predetermined hydraulic pressure value P1, and the braking force by the brake hydraulic pressure Pa is applied to the wheels 4.

  Thereafter, when the accelerator pedal is depressed from the release position at time t4 and a start-related operation is performed, the accelerator operation of the accelerator pedal is detected by the accelerator sensor 45 which is the start-related operation detecting means 50, and therefore the driver's intention to start Is detected. As a result, the automatic stop is completed and restart is started, and the operation of the electric parking brake device 30b is released almost simultaneously, the operation of the brake force holding device 26 is released, and the vehicle 1 starts. Then, the brake hydraulic pressure Pa of the wheel cylinder 21a is reduced to the brake hydraulic pressure P in the master cylinder 23a by releasing the operation of the brake force holding device 26.

Next, the operation and effect of the first embodiment configured as described above will be described.
In the engine automatic stop / restart device 12 including the control unit 80 that restarts the engine 2 when the restart condition is satisfied, the brake operation detection unit 44 detects a brake operation insufficient state. Sometimes, the start related operation detecting means 50 detects the start related operation, that is, the driver's intention to start is detected.
With this configuration, since the start-related operation is an operation performed based on the driver's intention to start, even if the brake operation is insufficient, the driver performs a start-related operation indicating the start intention. Until the engine 2 is restarted. As a result, since it is not necessary to maintain the operation state of the brake pedal 22 in order to continue the automatic stop state, for example, the signal can be waited with the brake pedal 22 released, and the operation to the brake pedal 22 can be continued. The driver's burden for the vehicle can be reduced. Furthermore, restarting that is not intended by the driver is prevented, and in turn, starting of the vehicle that is not intended by the driver is prevented. In addition, when the driver intends to start, the driver can perform quick restart and start by performing a start-related operation after releasing the operation of the brake pedal 22.

The start-related operations are that the accelerator operation unit is operated from the accelerator release position, the brake pedal 22 is operated until the brake operation insufficient state is resolved, and the steering wheel is operated more than a predetermined steering angle or more than a predetermined steering torque. Operating the manual parking brake device 30a, operating the shift position from the travel position to the travel position by the shift lever of the transmission 3a, and operating the key switch 6 to the start position for starting the engine 2. Is at least one of being.
According to this, the driver's intention to start is determined by the driver's operation of the accelerator operation unit, the operation of the brake pedal 22 to cancel the insufficient brake operation state, the steering wheel operation, the operation of the manual parking brake device 30a, the key switch 6 It can be detected through at least one operation.

The vehicle 1 includes a brake force holding device 26 and an electric parking brake device 30b that can apply a braking force to the wheels 4 separately from the brake pedal 22, and the control means 80 is in a state where an insufficient brake operation state is detected. In addition, the brake force holding device 26 or the electric parking brake device 30b is operated.
According to this, when a brake operation insufficient state by the brake pedal 22 occurs, the braking force is applied to the wheel 4 by the brake force holding device 26 or the electric parking brake device 30b separate from the brake pedal 22, The burden on the driver for continuing the operation on the brake pedal 22 is reduced, and the start of the vehicle not intended by the driver is prevented.

When the brake operation shortage state is detected, the control means 80 performs the operation release and the restart of the brake force holding device 26 and the electric parking brake device 30b when the start-related operation is detected.
According to this, when the start-related operation indicating the driver's intention to start is detected, the braking force holding device 26 and the electric parking brake device 30b are released and restarted. Smooth start is possible.

The engine automatic stop / restart device 12 includes restart request detecting means 70 for detecting a restart request for requesting restart, and the control means 80 is a case where a brake operation insufficient state is detected and a start-related operation is not detected. When the restart request is detected, the electric parking brake device 30b is operated and restarted.
According to this, when the brake operation insufficient state is detected and the start related operation is not detected, and therefore when the driver does not indicate the start intention, the engine 2 is based on the vehicle state not related to the start intention of the driver. When the restart request that requires the restart of the vehicle is detected, the engine 2 is restarted in a state where the brake force applying means is operated, so that the vehicle 1 is prevented from starting unintentionally by the driver. .

The engine automatic stop / restart device 12 includes a parking brake state detection means 47 for detecting a brake force shortage state of the manual parking brake device 30a, and the control means 80 detects a brake operation shortage state and the brake force shortage state is detected. When detected, the brake force holding device 26 is operated.
According to this, when the brake operation shortage state occurs due to the release of the brake pedal 22 or the like, the brakes when the manual parking brake device 30a is in a state where the brake force is insufficient due to the manual parking brake device 30a being deactivated or the like. A braking force is automatically applied to the wheel 4 by the force holding device 26. As a result, even when the operation of the manual parking brake device 30a is omitted, the start of the vehicle 1 can be prevented while reducing the burden on the driver for continuing the operation on the brake pedal 22, and the vehicle is not intended by the driver. 1 start can be prevented.

The control unit 80 operates the electric parking brake device 30b and the brake force holding device 26 when the start-related operation is not detected and the restart request is detected when the brake operation insufficient state is detected. The operation is canceled and restarted.
According to this, when a start-related operation is not detected, and therefore when the driver does not indicate a start intention, a restart that requires a restart of the engine 2 based on the vehicle state not related to the driver's start intention When the request is detected, the engine 2 is restarted in a state where the electric parking brake device 30b is operated, so that the start of the vehicle not intended by the driver is prevented. The driver can start the vehicle by releasing the electric parking brake device 30b.

  Next, a second embodiment of the present invention will be described with reference to FIGS. This second embodiment is different from the first embodiment in that the parking brake device 30 does not include the electric parking brake device 30b and is configured by the manual parking brake device 30a. It has the structure of. For this reason, the description about the same point as 1st Embodiment is abbreviate | omitted or simplified, and it demonstrates focusing on a different point. In addition, about the member same as the member of 1st Embodiment, or the corresponding member, the same code | symbol was used as needed.

  With reference to FIGS. 1 and 5 as appropriate centering on FIG. 6, the restart control method executed by the control means 80 of the engine automatic stop / restart apparatus 12 will be described focusing on differences from the first embodiment. To do.

  When it is determined in step S6 that there is an intention to start, the process proceeds to step S8a, where the control means 80 operates the starter motor 7, restarts the engine 2, and maintains the braking force through the brake control device 14. When the device 26 is in the activated state, the device 26 is deactivated. When the device 26 is in the deactivated state, the device 26 is maintained in the deactivated state, and the braking of the wheels 4 is released.

On the other hand, when it is determined in step S5 that there is no intention to start, the process proceeds to step S9, and when there is a restart request, the process proceeds to step S10a.
In step S10a, the control unit 80 activates a warning unit that issues a warning requesting the driver to depress the brake pedal 22 until the brake pedal 22 is in an effective operation state. Therefore, in this case, the restart is prohibited despite the restart request.
The warning means is constituted by a display device (for example, a lamp) or a sound generation device (for example, a warning sound generation device or a sound generation device).

After the warning is given in step S10a, the process returns to step S6 to determine the intention to start. When the driver depresses the brake pedal 22 in accordance with the warning, the start related operation is detected by the brake operation detecting means 44 which is the start related operation detecting means 50, so that it is determined in step S6 that there is an intention to start, and step S8a , The engine 2 is restarted, and the brake force retaining device 26 is released.
When the brake pedal 22 is not depressed despite the warning to the driver in step S10a, when the operating limit state is detected by the brake force holding state detecting means 73 (see FIG. 2), The operation of the brake force holding device 26 is released.

According to the second embodiment, in the vehicle 1 that does not include the electric parking brake device 30b and includes the manual parking brake device 30a, except for the processing in step S10 (see FIG. 3), the same as in the first embodiment. In addition to the functions and effects, the following functions and effects are exhibited.
That is, when there is no intention to start and there is a restart request, in step S10a, a warning requesting the driver to depress the brake pedal 22 is issued, while restart of the engine 2 is prohibited. Then, when the driver depresses the brake pedal 22 in accordance with the warning, when it is determined in step S6 that the vehicle intends to start, restart is performed, the restart request is satisfied, and the brake pedal 22 is depressed. As a result, the vehicle 1 is prevented from starting while the brake caliper 21 is operating.

Hereinafter, an embodiment in which a part of the configuration of the above-described embodiment is changed will be described with respect to the changed configuration.
The transmission 3a may be a manual transmission. In this case, the power transmission device 3 of the vehicle 1 includes a clutch device that transmits and shuts off the power of the engine 2 to the transmission 3a. This clutch device includes a clutch whose connection state can be changed to transmit / cut power, and a clutch pedal as a clutch operation unit operated by a driver to change the connection state of the clutch. The control condition detection means 40 includes a clutch switch that detects a release position of the clutch pedal and an operation from the release position to the operation position (that is, an operation for disengaging the clutch), and a shift operation detection means. The shift operation detecting means detects a non-travel position that is a neutral position as a shift position of the transmission 3a or a travel position that is each shift position. An operation from the non-travel position to the travel position is a start-related operation. Is not included.
The start-related operation includes the operation of the clutch operation unit that operates the clutch from the release position to the operation position.
The automatic stop condition includes that the operation from the release position of the clutch pedal is detected by the clutch switch, and the non-traveling position is detected by the shift operation detecting means. The restart condition is that the clutch switch is operated by the clutch switch. This includes that the operation from the release position of the pedal is detected, and that the non-traveling position is detected by the shift operation detecting means.
When the transmission 3a is a manual type, the predetermined hydraulic pressure value P1 is set to a value that can prevent the vehicle 1 from traveling due to a road surface gradient when the vehicle stops and can maintain the stopped state.

The manual start / stop means may be a push start button.
Instead of the brake fluid pressure P, the brake effective operation state detected by the brake operation detection means 44 may be used as the automatic stop condition.
The foot brake device 20 may be a brake device (for example, a drum brake device) other than the disc brake device.
The brake force holding device 26 may be other than the hydraulic type.
The automatic parking brake device may be of a hydraulic type including a hydraulic pump in addition to the electric type.
The start-related operation includes an indirect operation performed by a driver's action (for example, a voice instruction) in addition to the driver's direct operation.
From the viewpoint of the influence of the restart request on the travel of the vehicle 1, the primary restart request and the secondary restart request that is less important for restarting the engine 2 than the primary restart request. When the primary restart request is detected, the restart is performed. When the secondary restart request is detected, the restart may not be performed. The secondary restart request includes, for example, an air conditioner operation request based on the passenger compartment temperature detected by the passenger compartment temperature sensor 64. In this case, the air conditioner is stopped without restarting the engine 2. May be maintained.
The engine may be a combustion engine other than the internal combustion engine, or may be an electric motor.
The vehicle may include a hybrid engine that includes an electric motor and an internal combustion engine as a prime mover for traveling. The vehicle may be a vehicle other than a four-wheeled vehicle, for example, a two-wheeled vehicle.

1 Vehicle 2 Engine 3a Transmission 4 Wheel 6 Key switch (manual starting means)
12 Engine automatic stop / restart device 21 Brake caliper (main brake)
22 Brake pedal (brake operation part)
26 Brake force holding device (brake force applying means)
30 Parking brake device 30a Manual parking brake device 30b Electric parking brake device (braking force applying means)
40 Control condition detection means 47, 47a Parking brake state detection means 50 Start-related operation detection means 70 Restart request detection means 80 Control means

Claims (7)

Control condition detecting means for detecting an automatic stop condition and a restart condition of an engine mounted on a vehicle, and when the automatic stop condition is satisfied, the engine is automatically stopped and the restart condition is satisfied And an engine automatic stop / restart device comprising a control means for restarting the engine.
The control condition detection means includes a brake operation detection means for detecting a brake operation shortage state of a brake operation unit that operates a main brake that applies a braking force to the wheels of the vehicle, and a driver relates to the start of the vehicle. A start-related operation detecting means for detecting a start-related operation to be performed,
The engine automatic stop / restart apparatus according to claim 1, wherein the restart condition is that the start-related operation is detected when the brake operation shortage state is detected.   In the vehicle, the start-related operation is performed when the accelerator operation unit is operated from the accelerator release position, the brake operation unit is operated until the insufficient brake operation state is resolved, or the steering wheel is operated at a predetermined steering angle or more. A clutch that operates a clutch that performs operation above a predetermined steering torque, deactivation of a parking brake, operation of a shift operation unit of a transmission, transmission and interruption of power of the engine to the wheels The operation unit is operated from the release position to the operation position, and manual start means operated by a driver to start the engine is operated to a start position for starting the engine. The engine automatic stop / restart device according to claim 1. The vehicle includes a brake force application unit capable of applying a brake force to the wheels separately from the brake operation unit.
3. The engine automatic stop / restart device according to claim 1, wherein the control unit operates the brake force applying unit when the brake operation insufficient state is detected. 4.   The control means performs the release of the brake force applying means and the restart when the start-related operation is detected when the insufficient brake operation state is detected. The engine automatic stop / restart device according to item 3. A restart request detecting means for detecting a restart request for requesting the restart;
The control means operates when the brake force application means is activated and restarted when the brake operation insufficient state is detected and the start-related operation is not detected and the restart request is detected. The engine automatic stop / restart device according to claim 3 or 4, wherein the restart is prohibited. The brake force applying means is a brake force holding device that holds a brake force of the main brake,
A parking brake state detecting means for detecting an insufficient braking force state of the parking brake of the parking brake device of the vehicle;
The engine according to claim 3 or 4, wherein the control means operates the brake force holding device when the insufficient brake operation state is detected and the insufficient brake force state is detected. Automatic stop restart device. The parking brake device is an automatic parking brake device,
The control means activates the parking brake and maintains the brake force when the start-related operation is not detected and the restart request is detected when the brake operation insufficient state is detected. The engine automatic stop / restart device according to claim 6, wherein the operation release and the restart are performed.

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