Deceleration Control System in a Vehicle, Vehicle Including a Deceleration Control System, and Deceleration Control Method

• US 20120022750A1
• Filed: 07/20/2011
• Published: 01/26/2012
• Est. Priority Date: 07/21/2010
• Status: Active Grant

• Current Assignee: Kawasaki Motors
• Original Assignee: Kawasaki Jukogyo Kabushiki Kaisha
• Inventors: Matsuda, Yoshimoto
• Granted Patent: US 9,482,170 B2
• Time in Patent Office: Days
• US Class Current: 701/51
• CPC Class Codes: B60K 31/00 Vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed, i.e. preventing speed from exceeding an arbitrarily established velocity or maintaining speed at a particular velocity, as selected by the vehicle operator fittings acting on two or more sub-units B60W30/14; speedometers G01P; systems or devices for controlling speed in general G05D13/00 ; in traffic anti-collision system for road vehicles G08G1/16
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 2300/36 Cycles; Motorcycles; Scooters
• CPC Class Codes: B60W 2510/1005 Transmission ratio engaged
• CPC Class Codes: B60W 2540/10 Accelerator pedal position
• CPC Class Codes: B60W 2540/12 Brake pedal position
• CPC Class Codes: B60W 2710/0677 Engine power
• CPC Class Codes: B60W 30/18136 Engine braking
• CPC Class Codes: F02D 2200/101 Engine speed
• CPC Class Codes: F02D 2200/50 said parameters being related to the vehicle or its components
• CPC Class Codes: F02D 2200/602 Pedal position
• CPC Class Codes: F02D 35/00 Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
• CPC Class Codes: F02D 41/0225 in relation with the gear ratio or shift lever position
• CPC Class Codes: F02D 41/045 Detection of accelerating or decelerating state detection thereof in general G01P
• CPC Class Codes: F02D 41/12 for deceleration F02D41/0005, F02D41/107 take precedence

Abstract

A deceleration control system in a vehicle comprises; a deceleration start detector; a memory for storing a normal state rule and a deceleration state rule to control a driving power, and a controller for controlling the driving power; wherein in the deceleration state rule, the driving power is changed based on the detection by a driving state detector, and a driving power decided in accordance with the deceleration state rule is greater than a driving power decided in accordance with the normal state rule according to the same driving state: and wherein the controller switches the normal state rule to the deceleration state rule and controls the driving power in accordance with the deceleration state rule, based on the detection by the driving state detector, when the deceleration start detector detects that the deceleration has started.

Claims

1. A deceleration control system in a vehicle comprising:

a driving state detector for detecting a driving state of the vehicle;

a deceleration start detector for detecting whether or not deceleration of the vehicle has started;

a memory for storing a control rule to control a driving power of a driving power source in the vehicle, the control rule including a normal state rule and a deceleration state rule being different from each other; and

a controller for controlling the driving power of the driving power source in accordance with the control rule;

wherein the deceleration state rule is set so that the driving power of the driving power source is changed based on a result of the detection performed by the driving state detector, and a driving power of the driving power source which is decided in accordance with the deceleration state rule according to a particular driving state is greater than a driving power of the driving power source which is decided in accordance with the normal state rule according to the particular driving state; and

wherein the controller switches the control rule from the normal state rule to the deceleration state rule and controls the driving power of the driving power source in accordance with the deceleration state rule, based on a result of the detection performed by the driving state detector, when the deceleration start detector detects that the deceleration of the vehicle has started.

2. The deceleration control system in the vehicle according to claim 1,

wherein the deceleration start detector determines whether or not a deceleration start condition that a driver has performed an operation for starting the deceleration is met and detects that the deceleration of the vehicle has started when the deceleration start condition is met.

3. The deceleration control system in the vehicle according to claim 2,

wherein the deceleration start detector determines that the deceleration start condition is met when the driver terminates an operation of an acceleration operation member.

4. The deceleration control system in the vehicle according to claim 2,

wherein the deceleration start detector determines that the deceleration start condition is met when an amount of an operation of a deceleration operation member performed by the driver is greater than a predetermined amount or a brake pressure is higher than a predetermined pressure value.

5. The deceleration control system in the vehicle according to claim 2,

wherein the deceleration start detector determines that the deceleration start condition is met when a reduction gear ratio in a transmission is changed to a greater value.

6. The deceleration control system in the vehicle according to claim 2,

wherein the controller maintains a state where the driving power of the driving power source is controlled in accordance with the deceleration state rule for a predetermined period of time that elapses after the control rule has been switched to the deceleration state rule.

7. The deceleration control system in the vehicle according to claim 2,

wherein the deceleration start detector includes two or more of a first estimator for estimating that the deceleration has started when a braking device is actuated by a braking operation performed by the driver, a second estimator for estimating that the deceleration has started when a reduction gear ratio in a transmission is changed to be higher, a third estimator for estimating that the deceleration has started when an acceleration operation is not performed by the driver, and a fourth estimator for estimating that the deceleration has started when a detected value of a rotational speed of the driving power source is a predetermined amount greater than an estimated value of the rotational speed which is estimated from the driving power of the driving power source;

and

wherein the deceleration start detector determines that the deceleration start condition is met when either one of the two or more estimators estimates that the deceleration has started.

8. The deceleration control system in the vehicle according to claim 2,

wherein the driving state detector includes a reduction gear ratio detector for detecting a reduction gear ratio in a transmission and a rotational speed detector for detecting a rotational speed of the driving power source;

and

wherein the controller controls the driving power of the driving power source in accordance with the deceleration state rule, based on the reduction gear ratio detected by the reduction gear ratio detector and the rotational speed detected by the rotational speed detector.

9. The deceleration control system in the vehicle according to claim 2,

wherein the controller controls the driving power of the driving power source in accordance with the deceleration state rule such that an increasing magnitude of a driving power of the driving power source corresponding to a first reduction gear ratio in a transmission is greater than an increasing magnitude of a driving power of the driving power source corresponding to a second reduction gear ratio in the transmission, the second reduction gear ratio being less than the first reduction gear ratio.

10. The deceleration control system in the vehicle according to claim 2,

wherein the controller controls the driving power of the driving power source in accordance with the deceleration state rule such that an increasing magnitude of a driving power of the driving power source corresponding to a first rotational speed of the driving power source is greater than an increasing magnitude of a driving power of the driving power source corresponding to a second rotational speed of the driving power source, the second rotational speed being less than the first rotational speed.

11. The deceleration control system in the vehicle according to claim 2, further comprising:

a slip value detector for detecting a slip value of a drive wheel;

wherein the controller compensates the driving power of the driving power source decided in accordance with the deceleration state rule, based on the slip value of the drive wheel detected by the slip value detector.

12. The deceleration control system in the vehicle according to claim 2,

wherein the controller changes the driving power of the driving power source such that the driving power gets closer over time to a driving power decided in accordance with the normal state rule, when a condition used for switching the control rule to be referred to from the deceleration state rule to the normal state rule is met.

13. The deceleration control system in the vehicle according to claim 1,

wherein the controller inhibits switching from the normal state rule to the deceleration state rule when a driving speed is less than a predetermined value.

14. The deceleration control system in the vehicle according to claim 1,

wherein the deceleration start detector detects whether or not deceleration caused by a back torque applied from a drive wheel to the driving power source has started.

15. The deceleration control system in the vehicle according to claim 1,

wherein the deceleration start detector detects whether or not deceleration caused by a back torque has started, based on an amount of an operation of an operation member performed by a driver.

16. The deceleration control system in the vehicle according to claim 1,

wherein the normal state rule is a control rule in a case where a back torque applied from a drive wheel toward the driving power source does not occur;

and

the deceleration state rule is a control rule in a case where the back torque occurs.

17. A vehicle comprising a deceleration control system including:

a driving state detector for detecting a driving state of the vehicle;

a deceleration start detector for detecting whether or not deceleration of the vehicle has started;

a memory for storing a control rule to control a driving power of a driving power source in the vehicle, the control rule including a normal state rule and a deceleration state rule being different from each other; and

a controller for controlling the driving power of the driving power source in accordance with the control rule;

wherein the deceleration state rule is set so that the driving power of the driving power source is changed based on a result of the detection performed by the driving state detector, and a driving power of the driving power source which is decided in accordance with the deceleration state rule according to a particular driving state is greater than a driving power of the driving power source which is decided in accordance with the normal state rule according to the particular driving state; and

wherein the controller switches the control rule from the normal state rule to the deceleration state rule and controls the driving power of the driving power source in accordance with the deceleration state rule, based on a result of the detection performed by the driving state detector, when the deceleration start detector detects that the deceleration of the vehicle has started.

18. A deceleration control method for a vehicle, comprising the steps of:

detecting whether or not deceleration caused by a back torque has started; and

controlling a driving power of a driving power source to mitigate a degree of the deceleration by changing the driving power based on a driving state of the vehicle, when it is detected that the deceleration caused by the back torque has started, in the detecting step.

19. The deceleration control method according to claim 18, comprising the step of:

calculating a value corresponding to a speed change per unit time after the deceleration caused by the back torque has started, based on a driving state of the vehicle;

wherein in the step of controlling the driving power of the driving power source, the driving power is compensated such that an increasing magnitude of the driving power is greater as the value corresponding to the speed change per unit time is greater.

20. A deceleration control method for a vehicle comprising the steps of:

estimating whether or not deceleration caused by a back torque has started, based on an amount of an operation of an operation member performed by a driver; and

controlling a driving power of a driving power source to mitigate a degree of the deceleration, when it is estimated that the deceleration caused by the back torque has started, in the estimating step.