Restart control device for vehicle

Abstract

To provide a restart control device for a vehicle, which can achieve both prevention of sudden jumping during automatic restart in a vehicle equipped with a manual transmission and improvement of drivability.SOLUTION: A vehicle comprises: an engine 2 that supplies driving force to wheels 10 via a manual transmission 3; a friction brake 4 that applies braking force to the wheels 10; a restart control unit 51 that automatically stops the engine 2 when preset automatic stop conditions are met, and automatically restarts the engine 2 when preset restart conditions are met; and a braking force control unit 52 that adjusts the braking force of the friction brake 4. In the case where rotation of an output shaft of the manual transmission 3 is detected during execution of the automatic restart of the engine 2, the restart control unit 51 stops the automatic restart of the engine 2, and the braking force control unit 52 applies braking force to the wheels 10 by the friction brake 4.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a restart control device for a vehicle. [Background technology]

[0002] Patent document 1 describes that in a manual vehicle with idle stop control, the restart conditions include a condition that the brake members are operated so that braking force is no longer applied to the wheels when power between the engine output shaft and the drive wheels is cut off by the clutch, and that braking force is forcibly applied to the wheels for a predetermined period of time after the restart condition is met. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2012-76474 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, as described in Patent Document 1, when the braking force is increased before the restart, in the case of a normal start where the vehicle does not jump out, the braking force needs to be released when starting off, and there is a risk that the release of the braking force will be delayed due to control delays or physical delays, causing the driver to feel a drag when starting off.

[0005] Therefore, an object of the present invention is to provide a restart control device for a vehicle that can achieve both prevention of sudden jumping during automatic restart in a vehicle equipped with a manual transmission and improvement of drivability. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention is a vehicle restart control device for a vehicle equipped with an internal combustion engine that supplies driving force to wheels via a manual transmission and a friction brake that applies braking force to the wheels, the device comprising: a restart control unit that automatically stops the internal combustion engine when a preset automatic stop condition is met, and automatically restarts the internal combustion engine when a preset restart condition is met, and a braking force control unit that adjusts the braking force of the friction brake, wherein if rotation of the output shaft of the manual transmission is detected during automatic restart of the internal combustion engine, the restart control unit stops the automatic restart of the internal combustion engine, and the braking force control unit applies braking force to the wheels using the friction brake. Effect of the Invention

[0007] In this way, according to the present invention, it is possible to prevent sudden jumping during automatic restart in a vehicle equipped with a manual transmission while improving drivability. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic diagram of a vehicle restart control device according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a flowchart showing a procedure of restart control processing of the vehicle restart control device according to one embodiment of the present invention. [Diagram 3] FIG. 3 is a time chart showing a change in hydraulic brake amount due to the restart control process in a state in which the in-gear state of the manual transmission cannot be detected by the vehicle restart control device according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] A vehicle restart control device according to one embodiment of the present invention is a vehicle restart control device for a vehicle equipped with an internal combustion engine that supplies driving force to the wheels via a manual transmission and a friction brake that applies a braking force to the wheels, and is equipped with a restart control unit that automatically stops the internal combustion engine when a preset automatic stop condition is met and automatically restarts the internal combustion engine when a preset restart condition is met, and a braking force control unit that adjusts the braking force of the friction brake, and is configured such that if rotation of the output shaft of the manual transmission is detected during automatic restart of the internal combustion engine, the restart control unit cancels the automatic restart of the internal combustion engine and the braking force control unit applies braking force to the wheels using the friction brake.

[0010] As a result, the vehicle restart control device according to one embodiment of the present invention can simultaneously prevent sudden jumping during automatic restart in a vehicle equipped with a manual transmission and improve drivability. EXAMPLES

[0011] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A vehicle restart control device according to an embodiment of the present invention will be described in detail below with reference to the drawings.

[0012] In FIG. 1, a vehicle 1 equipped with a vehicle restart control device according to one embodiment of the present invention includes an engine 2 as an internal combustion engine, a manual transmission 3, a friction brake 4, and a control unit 5.

[0013] A plurality of cylinders are formed in the engine 2. In this embodiment, the engine 2 is configured to perform a series of four strokes, which are an intake stroke, a compression stroke, an expansion stroke, and an exhaust stroke, for each cylinder.

[0014] A starter 21 is connected to the engine 2. The starter 21 is connected to a crankshaft of the engine 2. When electric power is supplied to the starter 21, the starter 21 rotates to rotate the crankshaft and provide the engine 2 with a rotational force at the time of starting.

[0015] The manual transmission 3 changes the speed of the rotation output from the engine 2 and drives the wheels 10 via a drive shaft 11. The manual transmission 3 is equipped with a constant mesh type transmission mechanism (not shown) made of a parallel shaft gear mechanism. The manual transmission 3 is adapted to select a gear position in the transmission mechanism in response to the operation of a shift lever 34 by the driver.

[0016] Depending on the operation of the shift lever 34, the manual transmission 3 can be in any one of the following states: a first to fifth gear shift state corresponding to a predetermined gear ratio; a neutral state in which the rotation output from the engine 2 is not transmitted to the drive shaft 11; or a reverse state for moving the vehicle 1 backward.

[0017] The shift lever 34 is provided with a neutral switch 35. The neutral switch 35 outputs an ON signal when the shift lever 34 is in the neutral position.

[0018] A clutch 31 of, for example, a dry single-plate type is provided between the engine 2 and the manual transmission 3 , and the clutch 31 engages or disengages the power transmission between the engine 2 and the manual transmission 3 .

[0019] The transition of the clutch 31 between the engaged and released power transmission states corresponds to the depression position of the clutch pedal 32, that is, the clutch stroke.

[0020] When the clutch pedal 32 is not depressed, the clutch 31 is in an engaged state, and the rotation of the crankshaft of the engine 2 is transmitted to the manual transmission 3.

[0021] On the other hand, when the clutch pedal 32 is depressed, the clutch 31 is in a released state, and the transmission of power from the crankshaft of the engine 2 to the manual transmission 3 is cut off.

[0022] The clutch pedal 32 is provided with a clutch stroke sensor 33. The clutch stroke sensor 33 detects the amount of depression of the clutch pedal 32.

[0023] The friction brakes 4 apply a mechanical braking force to the wheels 10 in response to the driver's operating pressure (pedal force) input to a brake pedal (not shown). The friction brakes 4 are provided on each wheel 10, and apply a braking force to the wheels 10 by pressing brake pads against calipers by cylinders using hydraulic pressure supplied from a hydraulic motor (not shown). The friction brakes 4 are adapted to apply a mechanical braking force to the wheels 10 under the control of a control unit 5.

[0024] The control unit 5 is configured by a computer unit including a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), an input port, and an output port.

[0025] The ROM of the control unit 5 stores various control constants, various maps, and the like, as well as a program for causing the computer unit to function as the control unit 5. That is, the computer unit functions as the control unit 5 by the CPU executing the program stored in the ROM.

[0026] To the input port of the control unit 5, various sensors including the above-mentioned clutch stroke sensor 33 and neutral switch 35, as well as a rotation sensor 53, an acceleration sensor 54, and an engine speed sensor 55 are connected.

[0027] The rotation sensor 53 detects the rotation speed of the output shaft of the manual transmission 3. The acceleration sensor 54 detects the acceleration of the vehicle 1. The engine rotation speed sensor 55 detects the engine rotation speed of the engine 2.

[0028] On the other hand, the output port of the control unit 5 is connected to various control targets including the engine 2 and the friction brake 4 described above.

[0029] The control unit 5 includes a restart control unit 51 that automatically stops the engine 2 when a preset automatic stop condition is met and automatically restarts the engine 2 when a preset restart condition is met, and a braking force control unit 52 that adjusts the braking force of the friction brake 4.

[0030] In this embodiment, if rotation of the output shaft of the manual transmission 3 is detected while automatic restart of the engine 2 is being performed, the restart control unit 51 stops the restart of the engine 2, and the braking force control unit 52 applies braking force to the wheels 10 by the friction brake 4.

[0031] The braking force control unit 52 increases the braking force by the friction brake 4 until the rotation speed of the output shaft of the manual transmission 3 decreases.

[0032] The braking force control unit 52 continues to apply the braking force by the friction brake 4 until the rotation speed of the output shaft of the manual transmission 3 becomes zero.

[0033] The restart control process performed by the vehicle restart control device according to this embodiment configured as above will be described with reference to Fig. 2. The restart control process described below is started when the control unit 5 starts its operation, and is executed at preset time intervals.

[0034] In step S1, the control unit 5 determines whether or not the automatic stop condition is met and the engine 2 is automatically stopped in an idling stop state.

[0035] If it is determined that the engine is in an idling stop state, the control unit 5 executes the process of step S2. If it is determined that the engine is not in an idling stop state, the control unit 5 ends the restart control process.

[0036] In step S2, the control unit 5 determines whether or not the restart condition is met and a request to restart the engine 2 is made.

[0037] If it is determined that there is a restart request, the control unit 5 executes the process of step S3. If it is determined that there is no restart request, the control unit 5 ends the restart control process.

[0038] In step S3, the control unit 5 determines whether the manual transmission 3 is in an in-gear state in which the manual transmission 3 is in a shifting state or in a reverse state.

[0039] If it is determined that the gear is in, the control unit 5 executes the process of step S3. If it is determined that the gear is not in, the control unit 5 executes the process of step S4.

[0040] In step S4, the control unit 5 starts the automatic restart. After executing the process of step S4, the control unit 5 executes the process of step S5.

[0041] In step S5, the control unit 5 determines whether or not the rotation of the output shaft of the manual transmission 3 has been detected.

[0042] If it is determined that the rotation of the output shaft of the manual transmission 3 is detected, the control unit 5 executes the process of step S7. If it is determined that the rotation of the output shaft of the manual transmission 3 is not detected, the control unit 5 executes the process of step S6.

[0043] In step S6, the control unit 5 completes the starting of the engine 2. After executing the process of step S6, the control unit 5 ends the restart control process.

[0044] In step S7, the control unit 5 stops the restart of the engine 2. After executing the process of step S7, the control unit 5 executes the process of step S8.

[0045] In step S8, the control unit 5 activates the friction brake 4 to apply a braking force to the wheels 10. After executing the process of step S8, the control unit 5 executes the process of step S9.

[0046] In step S9, the control unit 5 determines whether the rotation speed of the output shaft of the manual transmission 3 has decreased.

[0047] If it is determined that the rotation speed of the output shaft of the manual transmission 3 has decreased, the control unit 5 executes the process of step S11. If it is determined that the rotation speed of the output shaft of the manual transmission 3 has not decreased, the control unit 5 executes the process of step S10.

[0048] In step S10, the control unit 5 increases the braking force by the friction brake 4. After executing the process of step S10, the control unit 5 executes the process of step S9.

[0049] In step S11, the control unit 5 determines whether or not the rotation speed of the output shaft of the manual transmission 3 has become zero.

[0050] If it is determined that the rotation speed of the output shaft of the manual transmission 3 has become zero, the control unit 5 executes the process of step S13. If it is determined that the rotation speed of the output shaft of the manual transmission 3 has not become zero, the control unit 5 executes the process of step S12.

[0051] In step S12, the control unit 5 continues application of the braking force by the friction brake 4. After executing the process of step S12, the control unit 5 executes the process of step S11.

[0052] In step S13, the control unit 5 ends the application of the braking force by the friction brake 4. After executing the process of step S13, the control unit 5 ends the restart control process.

[0053] Such an operation based on the restart control process will be described with reference to Fig. 3. Fig. 3 shows the operation in a state in which the in-gear state of the manual transmission 3 cannot be detected.

[0054] At time t1, when the restart condition is met and the restart flag becomes "1", automatic restart of the engine 2 is initiated.

[0055] At time t2, when the rotation speed of the engine 2 increases, the amount of jump, which is the rotation speed of the output shaft of the manual transmission 3, also increases since the engine 2 is in gear.

[0056] When rotation of the output shaft of the manual transmission 3 is detected, at time t3, the restart is stopped, the restart flag becomes zero, and a braking force is applied to the wheels 10 by the friction brake 4.

[0057] Thereafter, since the rotation speed of the output shaft of the manual transmission 3 does not decrease, the braking force by the friction brake 4 is increased, and when the rotation speed of the output shaft of the manual transmission 3 begins to decrease at time t4, the braking force by the friction brake 4 is maintained as is.

[0058] Thereafter, when the rotation speed of the output shaft of the manual transmission 3 becomes zero at time t5, the application of braking force by the friction brake 4 is terminated.

[0059] When the clutch 31 is released at time t6, the restart condition is met, the restart flag becomes "1", and the automatic restart of the engine 2 is initiated. At time t7, the restart is completed.

[0060] Thus, in this embodiment, if rotation of the output shaft of the manual transmission 3 is detected while automatic restart of the engine 2 is being performed, the restart control unit 51 stops the restart of the engine 2, and the braking force control unit 52 applies braking force to the wheels 10 by the friction brake 4.

[0061] As a result, if rotation of the output shaft of the manual transmission 3 is detected while the automatic restart of the engine 2 is being performed, the restart of the engine 2 is stopped and a braking force is applied to the wheels 10 by the friction brake 4.

[0062] When it is detected that the vehicle 1 has jumped out, the friction brake 4 applies a braking force, thereby enabling the vehicle 1 to be appropriately maintained in a stopped state. By applying a braking force by the friction brake 4 after detecting that the vehicle 1 has jumped out, it is possible to prevent a start delay during normal starting. By using the friction brake 4, which has a quick rise in braking force, the vehicle 1 can be appropriately maintained in a stopped state even after it is detected that the vehicle 1 has jumped out.

[0063] Furthermore, the braking force control unit 52 increases the braking force by the friction brake 4 until the rotation speed of the output shaft of the manual transmission 3 decreases.

[0064] As a result, the braking force is increased by the friction brake 4 until the rotation speed of the output shaft of the manual transmission 3 decreases, so that the vehicle 1 can be preferably maintained in a stopped state.

[0065] Furthermore, the braking force control unit 52 continues to apply the braking force by the friction brake 4 until the rotation speed of the output shaft of the manual transmission 3 becomes zero.

[0066] As a result, the application of braking force by the friction brake 4 continues until the rotation speed of the output shaft of the manual transmission 3 becomes zero. Therefore, the vehicle 1 can be preferably maintained in a stopped state.

[0067] In this embodiment, the sudden jump of the vehicle 1 is detected by the rotation of the output shaft of the manual transmission 3, but the sudden jump of the vehicle 1 may be detected by the acceleration sensor 54 or the like.

[0068] In this embodiment, an example has been described in which the control unit 5 performs various judgments and calculations based on various sensor information, but this is not limited to the above. The vehicle 1 may be provided with a communication unit capable of communicating with an external device such as an external server, and various judgments and calculations may be performed by the external device based on the detection information of the various sensors transmitted from the communication unit. The judgment results and calculation results may be received by the communication unit, and various controls may be performed using the received judgment results and calculation results.

[0069] Although an embodiment of the invention has been disclosed, it will be apparent to one of ordinary skill in the art that modifications may be made thereto without departing from the spirit and scope of the invention, and it is intended that all such modifications and equivalents be included in the following claims. [Explanation of symbols]

[0070] 1 vehicle 2. Engine (internal combustion engine) 3. Manual transmission 4 Friction brakes 5. Control section 10 wheels 35 Neutral switch 51 Restart control section 52 Braking force control section 53 Rotation Sensor

Claims

1. A restart control device for a vehicle equipped with an internal combustion engine that supplies driving force to wheels via a manual transmission and a friction brake that applies a braking force to the wheels, comprising: a restart control unit that automatically stops the internal combustion engine when a preset automatic stop condition is satisfied and automatically restarts the internal combustion engine when a preset restart condition is satisfied; A braking force control unit that adjusts the braking force of the friction brake, A restart control device for a vehicle, in which, when rotation of the output shaft of the manual transmission is detected during automatic restart of the internal combustion engine, the restart control unit stops the automatic restart of the internal combustion engine, and the braking force control unit applies braking force to the wheels by the friction brake.

2. 2. The restart control device for a vehicle according to claim 1, wherein the braking force control section increases the braking force by the friction brake until the rotation speed of the output shaft of the manual transmission decreases.

3. 3. The vehicle restart control device according to claim 1, wherein the braking force control section continues application of the braking force by the friction brake until a rotation speed of an output shaft of the manual transmission becomes zero.

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