JPH059295B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a drive system control device for an automobile, and particularly to a drive system control device that performs speed change control without using a speed change diagram.

[Conventional technology]

2. Description of the Related Art Conventionally, in an electronically controlled automatic transmission equipped with a torque converter or the like as a starting device, a speed change control is performed to change gear stages according to vehicle speed and throttle opening. In this type of automatic transmission, in order to improve fuel efficiency while satisfying acceleration performance,
Depending on the rate of change in throttle opening, control is performed by automatically selecting the optimal one from among a number of speed diagrams pre-stored in the electronic control unit, or by manually switching the speed diagram by the driver. Ru.

[Problem that the invention seeks to solve]

However, when the above-described control is performed, there are problems in that the number of types of shift diagrams increases, the method for determining the shift timing tends to become complicated, and the amount of data to be stored in advance increases.

Therefore, the present invention determines the timing of shifting according to the vehicle driving conditions based on pre-stored engine output data and vehicle characteristic data without using a shifting diagram, and uses these to determine the timing of shifting of the automatic transmission. An object of the present invention is to provide a drive system control device for an automobile that improves both fuel efficiency and acceleration by controlling the above.

[Means for solving problems]

In order to achieve the above object, the vehicle drive system control device of the present invention includes an accelerator pedal depression amount detector that detects the amount of depression of the accelerator pedal, and an output shaft torque detector that detects the output shaft torque of an automatic transmission. a vehicle speed detector that detects vehicle speed; a required acceleration calculation circuit that inputs an accelerator pedal depression amount signal from the accelerator pedal depression amount detector to calculate a requested acceleration requested by the driver; and fuel consumption characteristics;
An engine/vehicle data storage circuit that stores engine output data such as engine torque characteristics and torque converter characteristics, and vehicle characteristic data such as vehicle weight, a requested acceleration signal from the requested acceleration calculation circuit, and the output shaft torque. a required horsepower calculation circuit that receives an output torque signal from the detector and a vehicle speed signal from the vehicle speed detector and calculates the required horsepower based on data in the engine/vehicle data storage circuit; and the required horsepower calculation circuit. The required horsepower signal and vehicle speed signal from the engine are inputted, and the fuel consumption amount for the engine state that achieves the required horsepower for each gear is determined based on the data in the engine/vehicle data storage circuit, and the gear ratio and vehicle speed with the best fuel efficiency are determined. A fuel consumption and throttle opening calculation circuit that selects the fuel consumption rate and calculates the throttle opening, and inputs the gear ratio and the fuel consumption rate signal of the fuel consumption and throttle opening calculation circuit to calculate the fuel consumption at the current gear ratio. If the gear ratio of the fuel consumption and throttle opening calculation circuit and its fuel consumption rate signal are better than the consumption rate, a gear shift signal is output, and a gear shift judgment is made to determine the throttle opening signal corresponding to the gear ratio. and a throttle control circuit, a speed change control circuit that controls the automatic transmission to change speed based on the speed change determination and output signal from the throttle control circuit, and a throttle valve that controls a throttle valve based on the output signal from the speed change determination and throttle control circuit. Consists of a throttle valve actuator.

[Action and effect of invention]

With the above configuration, the vehicle drive system control device of the present invention calculates the required horsepower according to the vehicle running conditions based on each detector signal, engine output data, and vehicle characteristic data, and calculates the required horsepower according to the vehicle running conditions. Shift control is performed by comparing the current gear ratio with the optimum gear ratio to achieve fuel efficiency.

Therefore, according to the present invention, improved acceleration performance and improved fuel efficiency can be achieved by shift control that does not use a shift diagram, and compared to the conventional method, the amount of data stored in advance can be improved. This has the effect of reducing the amount of data and thereby simplifying calculations within the circuit.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An automobile drive system control device according to the present invention will be explained based on an embodiment shown in the drawings.

As shown in FIGS. 1 and 2, the drive system control device 1 of the present invention includes an accelerator pedal depression amount detector 11 that detects the depression amount (α) of the accelerator pedal 21, and an output shaft torque (T) of the automatic transmission 2. The output shaft torque detector 12 detects the vehicle speed ( _{N p ), the vehicle speed detector 13 detects the vehicle speed (N p} ), and the accelerator pedal depression amount (α) signal from the accelerator pedal depression amount detector 11 is input to the driver. The required acceleration (N・_pcpM )
an engine/vehicle data storage circuit ROM that stores engine output data such as fuel consumption characteristics, engine torque characteristics, torque converter characteristics, and vehicle characteristic data such as vehicle weight; The required acceleration (N· _pcpM ) signal from the required acceleration calculation circuit 41, the output torque ( _Tp ) signal from the output shaft torque detector 12, and the vehicle speed ( _Np ) signal from the vehicle speed detector 13 are input. The required horsepower calculation circuit 42 calculates the required horsepower (PW _req ) based on the data in the engine/vehicle data storage circuit ROM, and the required horsepower (PW _req ) signal and vehicle speed (N _p ) signal from the required horsepower calculation circuit 42. , calculate the fuel consumption of the engine state that achieves the required horsepower for each gear based on the data in the engine/vehicle data storage circuit ROM, select the gear ratio with the best fuel efficiency and its fuel consumption rate, The fuel consumption and throttle opening calculating circuit 44 calculates the throttle opening, and the gear ratio (λ) and its fuel consumption rate signal are input to the fuel consumption and throttle opening calculation circuit 44 to calculate the fuel consumption at the current gear ratio (λ _opw ). If the gear ratio (λ) of the fuel consumption and throttle opening calculation circuit 44 and its fuel consumption rate signal are better than the consumption rate, a gear shift signal is output and the throttle opening corresponding to the gear ratio (λ) is output. a speed change judgment and throttle control circuit 45 that determines the speed signal; and a speed change control circuit 3 that controls the automatic transmission to change speed based on the output signal from the speed change judgment and throttle control circuit 45.
and a throttle valve actuator 22 that controls the throttle valve based on the output (θ) signal from the speed change judgment and throttle control circuit 45.

In FIG. 1, reference numeral 4 indicates a drive system control circuit, 4A indicates an input interface for inputting detection signals from each of the detectors 11, 12, and 13, and 4B indicates a drive system control circuit.
is the gear ratio (λ) signal and throttle opening (θ)
This shows an output interface that outputs a signal.

Next, calculations in each part of the drive system control circuit 4 will be described in detail.

The required acceleration calculation circuit 41 calculates the required acceleration (N・_pcp ) requested by the driver based on the accelerator pedal depression amount (α) from the accelerator pedal depression amount detector 11.
Calculate _M ).

The required horsepower calculation circuit 42 receives the required acceleration (N· _pcpM ) signal from the required acceleration calculation circuit 41, the output shaft torque ( _Tp ) signal from the output shaft torque detector 12, and the vehicle speed (N _p ) signal and
The required horsepower (PW _req ) is calculated from the output shaft rotational acceleration (N· _p ) signal obtained by differentiating the vehicle speed (N _p ) with respect to time by the differentiating circuit 43 using the following formula.

Required horsepower PW _req = {T _p + J _p (N・_pcpM −N・_p )} N _p /η (e _req ) where J _p : Vehicle inertia moment η: Torque converter efficiency (function of e) e: Torque converter Speed ratio e _req : Required speed ratio of torque converter e = λ _i N _p /N _E e _req = λ _i N _p /N _Ereq However, N _E : Engine rotation speed N _Ereq : Required engine rotation speed Required horsepower (PW _req ) When calculating, first find the torque converter required speed ratio e _req . The torque converter required speed ratio (e _req ) is determined by a subprogram that solves the following equation C _p (e _req ) {λ _i N _p /e _req } ² = λ _i T _p /τ (e _req ).

Here, C _p : Torque converter capacity coefficient (function of e) τ : Torque converter torque ratio (function of e) After finding the torque converter required speed ratio (e _req ), torque converter efficiency (function of e _req ) {η (e _req )} and finally the required horsepower PW _req
Calculate.

However, in the required horsepower calculation circuit 42, the torque converter required speed ratio (e _req ) is determined by the gear ratio of each gear stage {λ _i =1,
2, 3)}, so the required horsepower (PW _req ) is also calculated accordingly.The method of calculation for the three types is slightly different.

The three types of torque converter speed ratios (e _req ) and required horsepower (PW _req ) will be expressed as follows.

e _req (i) (i = 1, 2, 3) PW _req (i) (i = 1, 2, 3) Also, from the above torque converter required speed ratio (e _req ), the required engine rotation speed {N _Ereq (i )(i=
1, 2, 3)} is obtained from the following equation.

N _Ereq = λ _i N _p /e _req (i) (i = 1, 2, 3) The fuel consumption and throttle opening calculation circuit 44 calculates the required horsepower (PW _req ) calculated by the required horsepower calculation circuit 42,
For each gear, the torque converter required speed ratio (e _req ), vehicle speed (N _p ), engine torque characteristic data and fuel consumption characteristic data in the ROM are calculated.
Find the fuel consumption of the engine state that realizes PW _req , select the gear ratio (λ _oew ) with the best fuel efficiency and its fuel consumption rate (fλ _oew ), and find its throttle throttle opening (θλ _oew ).

The shift determination and throttle control circuit 45 determines the fuel consumption rate (fλ _{oew ) when shifting to a new gear ratio (λ oew} ) and the fuel consumption rate (fλ _oew ) when the current gear ratio (λ _oew ) remains unchanged without shifting. fλ _oew ), and if the new fuel consumption rate (fλ _oew ) is better in terms of fuel efficiency, a shift command is output to the shift control circuit 3 shown in FIG.

The operation of an automatic transmission with three forward speeds and one reverse speed incorporating the automobile drive system control device of the present invention will be explained with reference to FIGS. 3 to 8.

FIG. 3 is a flowchart of the entire system of the vehicle drive train control device of the present invention.

The driving state of the vehicle, such as the amount of accelerator pedal depression (α), output shaft torque (T _p ), and vehicle speed (N _p ), is detected (101), and the drive system control circuit 4 detects the acceleration (N _p ).
(102), Calculation of required acceleration (N・_pcpM ) (103), Calculation of required horsepower (104), Calculation of fuel consumption rate and throttle opening (105), Shift judgment and throttle opening determination (106) The gear ratio (λ) is output to the shift control circuit 3 (107), the throttle valve actuator 22 is driven (108), and the next accelerator pedal depression amount (α) and output shaft torque are output. ( _Tp ) and vehicle speed ( _Np ) (109).

Figure 4 is a flowchart for calculating the required horsepower. After performing (103), read the torque converter characteristic data (110) and use the following formula C _p {e _req (i)} {λ _i N _p /e _req (i)} ² = λ _i T _p /τ {e _req (
i)} Calculate the torque converter required speed ratio {e _req (i)} from i=1, 2, 3 (111), and calculate the torque converter efficiency [η {e _req
(i)}] (112), and the required horsepower {W _req (i)} is calculated using the following formula PW _req (i)={T _p −J _p (N _pcpM −N _p )}N _p /η{ e _req (i)} and proceed to (105).

FIG. 5 is a flowchart for calculating fuel consumption rate and throttle opening.

After performing (104), the vehicle inertia moment (J _p ),
Read each gear ratio λ _i (i=1, 2, 3) (201), and based on the following formula, N _Ereq (i)=λ _i N _p /e _req (i) T _E λ _i =PW _req (i)／N _Ereq (i) i=1, 2, 3 Calculate the engine torque required for each gear ratio (202), read the engine fuel consumption characteristics from the ROM data (203), (202) Using the calculation results, calculate the fuel consumption rate for each engine state for each gear ratio (204), read the engine torque characteristics from the ROM data (205), and calculate the throttle opening (θ) for each of the above engine states. (206), select the minimum fuel efficiency, the gear position at that time, and the throttle opening (θ) at that time from the calculation results of (204) and (206) (207), and then select the current Gear ratio (λ _opw )
(208), selects the fuel efficiency (fλ _opw ) and throttle opening (θλ _opw ) for the engine state at the current gear from the calculation results of (204) and (206) (209). Then proceed to (106).

FIG. 6 is a flowchart for determining speed change and throttle opening.

(105) to determine whether the new fuel efficiency rate (fλ _opw ) is greater than the current fuel efficiency rate (fλ _opw ) (301);
When it is smaller than (fλ _opw ), λ is set to λ _oew and the shift signal is outputted (302), and when it is larger than (fλ _opw ), λ is set to λ _oew and a signal is output so as not to shift (303). Proceed to. (302) and (303) then determine the throttle opening corresponding to the gear ratio λ, perform (304), (107), and (108), and then proceed to (109).

FIG. 7 is a diagram in which a required horsepower (PW _req ) curve is superimposed on a diagram representing fuel consumption characteristics.

FIG. 8 shows a method for determining the throttle opening for each gear ratio.

The method is not limited to this embodiment, and the following method may be used.

(b) The input/output relationship of the required acceleration calculation circuit may be set arbitrarily by the designer so as to provide a comfortable ride for the driver.

(b) Detection of acceleration may be obtained directly from some kind of detector (for example, an acceleration detector) without relying on differential calculation of vehicle speed.

[Brief explanation of drawings]

FIG. 1 is a system configuration diagram of a drive system control device for a vehicle according to the present invention, FIG. 2 is a block diagram of a drive system control circuit of a drive system control device for a vehicle according to the present invention, and FIG. 3 is a diagram showing a drive system control circuit for a vehicle drive system according to the present invention. FIG. 4 is a flowchart for calculating the required horsepower of the vehicle drive system control device of the present invention, and FIG. 5 is a flow chart of the entire system of the vehicle drive system control device of the present invention. A flowchart for calculating the throttle opening degree; FIG. 6 is a flowchart for determining the speed change and throttle opening degree of the vehicle drivetrain control device according to the present invention; FIG. 7 is a flowchart for determining fuel optimization for the vehicle drivetrain control device according to the present invention. FIG. 8 is a conceptual diagram of how to determine the gear ratio. FIG. 8 is a conceptual diagram of how to determine each throttle opening degree in the vehicle drive system control device of the present invention. In the diagram: 1...Automotive drive system control device, 2...
Electronically controlled automatic transmission for automobiles, 3... Speed change control circuit, 4... Drive system control circuit, 11... Accelerator pedal depression amount detector, 12... Output shaft torque detector, 13... Vehicle speed detector, 41...Required acceleration calculation circuit, 42...Required horsepower calculation circuit, 43...Differential circuit, 44...Fuel efficiency and throttle opening calculation circuit, 45...Shift determination and throttle control circuit, CPU...Central processing circuit, ROM: Engine/vehicle data storage circuit.

Claims (1)

[Scope of Claims] 1. An accelerator pedal depression amount detector that detects the amount of depression of the accelerator pedal; an output shaft torque detector that detects the output shaft torque of an automatic transmission; a vehicle speed detector that detects vehicle speed; A required acceleration calculation circuit that calculates the required acceleration requested by the driver by inputting the accelerator pedal depression amount signal from the accelerator pedal depression amount detector, and engine output data such as fuel consumption characteristics, engine torque characteristics, torque converter characteristics, etc. and an engine/vehicle data storage circuit that stores vehicle characteristic data such as vehicle weight, a requested acceleration signal from the requested acceleration calculation circuit, an output torque signal from the output shaft torque detector, and the vehicle speed detection circuit. a required horsepower calculation circuit that inputs a vehicle speed signal from the engine and vehicle data storage circuit and calculates the required horsepower based on data in the engine/vehicle data storage circuit; and a required horsepower signal and vehicle speed signal from the required horsepower calculation circuit. , based on the data in the engine/vehicle data storage circuit, determine the fuel consumption in the engine state that achieves the required horsepower for each gear, select the gear ratio with the best fuel efficiency and its fuel consumption rate, and determine the throttle opening. A fuel consumption and throttle opening calculation circuit that calculates the fuel consumption and throttle opening calculation circuit, and a gear ratio and its fuel consumption rate signal of the fuel consumption and throttle opening calculation circuit are inputted and compared with the fuel consumption rate of the current gear ratio to calculate the fuel consumption and throttle opening. a speed change determination and throttle control circuit that outputs a speed change signal if the gear ratio of the speed calculation circuit and its fuel consumption rate signal are better, and also determines a throttle opening signal corresponding to the gear ratio; A vehicle comprising: a speed change control circuit that controls the speed change of an automatic transmission based on an output signal from the control circuit; and a throttle valve actuator that controls a throttle valve based on the speed change judgment and the output signal from the throttle control circuit. drive system control device.