JP2012031959A - Inertial travel control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle travel control method for effectively using kinetic energy possessed by a vehicle for inertial travel, in the inertial travel.SOLUTION: A power intermitting mechanism for cutting off joining to a driving wheel and a power transmission system or making the joining sparse, is arranged in a just near position (for example, between the driving wheel and a drive shaft) to the driving wheel of the power transmission system for transmitting power to the driving wheel from a vehicle power source such as an engine and a motor. In the inertial travel, the outflow to the power transmission system from the driving wheel of the kinetic energy possessed by the vehicle, is prevented and suppressed by cutting off the joining of the power intermitting mechanism or making the joining sparse, and use efficiency of the kinetic energy possessed by the vehicle to the inertial travel is enhanced. When performing the inertial travel, on a preset inertial travel possible road, inertial travel deceleration is measured and updated, the arrival possibility to a destination by the inertial travel is determined, and energy-saved inertial travel is performed by reducing rotation part corresponding weight when a determining result is possible.

Description

  The present invention relates to an inertial traveling control method for enabling further energy saving in addition to rationalization and systemization of inertial traveling when a vehicle performs inertial traveling for energy saving.

  With regard to coasting as an energy-saving traveling method for vehicles, a proposal has been made to further save energy by systematically automating conventional energy-saving coasting depending on the driving operation of a driver (Patent Document 1).

That is, knowing the current speed of the vehicle, the distance from the local point to the stop point, and the inertia traveling deceleration αd of the vehicle, reaching the stop point by the inertial traveling from the local point is limited to a specific driving condition (for example, before the stop point). It is determined whether or not it is possible to satisfy the condition that the traveling speed at a certain distance is equal to or higher than the minimum speed Vmin, and coasting is performed if possible. If impossible, constant speed running or acceleration running is performed while making the above determination until it becomes possible, and inertial running is started when it becomes possible.

In addition, as a measure to cope with fluctuations in inertial traveling deceleration αd due to traveling speed, road conditions, etc., inertial traveling deceleration αd is measured / updated every certain time or certain distance traveled during inertial traveling. Using the latest inertial traveling deceleration αd thus made, a determination is made as to whether or not the vehicle can reach the coasting point until the stop point.

However, even in the above-mentioned systematic / automated proposal for coasting, the means (power transmission system) for transmitting vehicle driving energy from the engine to the drive wheels during acceleration traveling or constant speed traveling is the kinetic energy of the vehicle during coasting. Consideration that it becomes a useless load when effectively using the vehicle for inertial running energy is insufficient.

JP2010-064576 Hiroki Nozaki: Basic Automotive Engineering (p123-131)

  The present invention seeks to eliminate waste when the kinetic energy of the vehicle is used for coasting.

The acceleration resistance Ra when the vehicle is accelerating is expressed by (Equation 1).
(Equation 1)
Ra = (W + ΔWa) αa / g

On the other hand, the deceleration resistance when the vehicle is coasting is expressed by (Equation 2).
(Equation 2)
Rd = (W + ΔWd) αd / g

In (Equation 1) and (Equation 2),
Ra: Acceleration resistance Rd: Deceleration resistance due to inertia traveling W: Vehicle weight ΔWa: Weight equivalent to rotating part during acceleration traveling ΔWd: Weight equivalent to rotating part during inertia traveling αa: Acceleration αd: Inertia traveling deceleration
g: Gravitational acceleration.

Here, ΔWa is the equivalent weight due to the inertial resistance of the power transmission system from the engine to the drive wheel, and ΔWd is the equivalent weight due to the inertial resistance of the power transmission system between the drive wheel and the power interrupting mechanism (clutch) via the drive shaft. Minutes.
Here, the equivalent weight due to the inertia of the engine is included in the rotating portion equivalent weight ΔWa during acceleration traveling, whereas the engine portion is “disconnected” by the clutch in the rotating portion equivalent weight ΔWd during inertia traveling. Is not included. Accordingly, the following relationship is established between the rotation portion equivalent weight ΔWa during acceleration travel and the rotation portion equivalent weight ΔWd during inertia travel.

(Equation 3)
ΔWa> ΔWd

However, the weight ∆Wd corresponding to the rotating part during inertial running is equivalent to the weight equivalent to the rotating part that is not originally required during inertial driving, i.e., the drive shaft connected to the driving wheel of the engine-driven manual transmission / FR vehicle, differential gear, final It includes a substantial weight due to inertial resistance of gears, propeller shafts, transmissions, and the like.
That is, if the equivalent weight due to the inertial resistance connected to the driving wheel during inertial driving can be removed, the equivalent weight of the rotating part during inertial driving is further reduced. As a result, the inertial driving resistance is reduced and the kinetic energy of the vehicle is reduced. It can be said that the energy saving effect of inertial driving is further enhanced by the extension of the inertial driving distance.

In order to remove the inertia resistance that becomes a load on the driving wheel during inertia traveling, it is most effective to separate the driving wheel and drive shaft during inertia traveling. However, even if this is not possible due to reliability, structure, or cost, it is necessary to connect the rotating part that is the load of the drive wheel as close to the drive wheel as possible during inertial driving, for example, between the final gear and the propeller shaft. If the disconnection or connection can be made “sparse”, the weight corresponding to the rotating part can be reduced, and therefore the energy saving effect by inertial running can be further improved.

That is, if the weight equivalent to the rotating portion during inertia running reduced by the above measures is ΔWd ′, the following relationship is established, and the conventional rotating portion during inertia running as shown in (Equation 5): The transmission amount of the kinetic energy of the vehicle from the driving wheel to the rotating part on the engine side via the drive shaft is reduced by an amount corresponding to the difference ΔWdd from the equivalent weight ΔWd, and the movement of the vehicle is equivalent to this reduction. The energy is effectively used as inertial traveling energy for inertial driving of the vehicle and exhibits an energy saving effect.

(Equation 4)
ΔWd> ΔWd '
(Equation 5)
ΔWdd = ΔWd−ΔWd ′
here,
ΔWd: Rotating part equivalent weight during coasting
ΔWd ′: the weight equivalent to the rotating part during inertia running reduced by the present invention,
ΔWdd: a weight equivalent to a difference between a conventional rotating portion equivalent weight during inertial running and a rotating portion equivalent weight according to the present invention
It is.

In the above, the inertia resistance reduction method at the time of coasting in an engine drive / manual transmission / FR vehicle has been described, but other forms of vehicles (engine-driven AT vehicles, FF vehicles as well as electric vehicles, hybrid vehicles, etc.) In the same way, that is, the inertia traveling with improved energy saving by reducing the equivalent weight of the rotating part by reducing the inertia resistance during inertia traveling in the power transmission system below the drive shaft that becomes the load of the driving wheel during inertia traveling Is possible.

Further, in the above, the disconnection of the coupling between the drive wheel and the power transmission system has been described. However, if the driven wheel also has an inertial resistance component due to the rotation of the driven wheel connected to the driven wheel, the rotation having the inertial resistance component with the driven wheel. It is also effective to block or sparse the connection with the part.

However, the inertia traveling as described above is not always possible during traveling. Need to be done only on roads where coasting conditions such as road slope, road pavement, road width, road conditions such as distance to stop, traffic volume, presence of intersection, distance to intersection, etc. .
Therefore, when a road section that can be coasted in advance is selectively extracted from the road state and the traffic state and stored in the map database of the car navigation system, the road on which the vehicle is currently traveling is a road that is capable of coasting. When the inertial traveling deceleration is extracted, the inertial traveling availability determination is performed, and the inertial traveling is determined to be possible, the inertial traveling that saves energy by reducing the weight equivalent to the rotating portion is performed.

As described above, according to the present invention, the rotating portion equivalent weight ΔWd during inertia running is greatly reduced compared to the rotating portion equivalent weight ΔWa during acceleration running or constant speed running. As a result, the inertial traveling distance due to the kinetic energy possessed by the vehicle is extended, and energy saving traveling is possible.

  In carrying out the invention of the present application, as described above, the power transmission system from the engine to the driving wheel is close to the medium driving wheel, for example, between the driving wheel and the drive shaft, and in the case of the driven wheel, the portion that becomes the rotational load of the driven wheel. It is necessary to provide a power interrupting mechanism at a position very close to the driven wheel.

  1 shows the power transmission system in the engine drive / manual transmission / FR vehicle, and FIG. 2 shows the power transmission in the case where the engine drive / manual transmission / FR vehicle shown in FIG. Each system is shown.

In FIG. 1, 100 is an engine, 110 is a power interrupting mechanism 111, a transmission 112, a propeller shaft 113, a final gear 114, a differential gear 115, and a drive shaft 116, and 120 is a drive wheel. .
In the acceleration traveling state or the constant speed traveling state, the intermittent mechanism (clutch) 111 is in the “continuous” state. 120.

On the other hand, in the inertial running state, the kinetic energy of the vehicle drives the drive shaft 116 to the transmission 112 of the power transmission system 110 that is invalid for the inertial traveling of the vehicle via the drive wheels 120 (however, the engine 100 is Since it is interrupted by the intermittence mechanism 111, it does not become the load of the kinetic energy which the vehicle has). That is, the kinetic energy of the vehicle causes a loss due to the drive shaft 116 to the transmission 112 in the power transmission system 110 serving as a load on the drive wheels.

On the other hand, in FIG. 2, reference numeral 200 denotes an engine, and 210 denotes a power interrupting mechanism 211, a transmission 212, a propeller shaft 213, a final gear 214, a differential gear 215, a drive shaft 216, and a power interrupting mechanism 217. A power transmission system 220 is a drive wheel.
Since the intermittent mechanisms 211 and 217 are in the “continuous” state in the acceleration traveling state or the constant speed traveling state, the driving force that is the output of the engine 200 is driven through the power transmission system 210 after the intermittent mechanism 211. 220.

On the other hand, in the inertial running state, the kinetic energy of the vehicle is not transmitted from the drive wheel 220 to the power transmission system 210 because the intermittent mechanism 217 is “disconnected”.
That is, the kinetic energy possessed by the vehicle is not lost in the power transmission system 210, and therefore the kinetic energy possessed by the vehicle is effectively used for coasting.

As described above, the present invention can further enhance the energy saving effect and the exhaust gas amount reduction effect due to inertial traveling by effectively using the kinetic energy of the vehicle during inertial traveling for inertial traveling.
Further, the present invention can be effectively applied not only to the engine drive / manual transmission / FR vehicle described above but also to an engine drive vehicle such as an AT vehicle / FF vehicle, as well as an electric vehicle, a hybrid vehicle, and the like.

Power transmission system explanatory diagram for conventional engine drive, manual transmission, FR vehicle quantity, It is a power transmission system explanatory drawing at the time of applying this invention to an engine drive, manual transmission, and FR vehicle.

1 and 2,
100, 200: engine,
110, 210: power transmission system,
111, 211: Intermittent mechanism,
112, 212: transmission,
113, 213: propeller shaft,
114, 214: Final gear,
115, 215: differential gear,
116, 216: drive shaft,
217: Drive shaft-drive wheel intermittent mechanism,
120, 220: drive wheels,

Claims (3)

  During inertial driving, in order to reduce the inertial resistance of the rotating part connected to the wheel that is the load of wheel rotation, the coupling between the wheel and the rotating part connected to the wheel is cut off or sparse at a part very close to the wheel. An inertial running control method characterized by the above.   In a power transmission system that transmits power from a vehicle power source such as an engine or a motor to a drive wheel, the drive wheel is used to cut off or reduce the kinetic energy of the vehicle that flows from the drive wheel toward the power source side during inertia traveling. An inertial traveling control method characterized in that coupling of a power transmission system is cut off or sparse between a driving wheel and a drive shaft.   In the map database of the car navigation system, the coastable road name and its section as the coasting area are accumulated, and coasting traveling area determination, coasting deceleration calculation / update, and coasting are performed. Performing the inertial running control method.